Yantai Huatong Road Engineering Co., Ltd. replied: Asphalt cold patching is a mixture of modified asphalt at room temperature. If proper anti-rutting agent and anti-stripping agent are added to cold patching material, the adhesion between cold patching material asphalt and stone can be effectively improved, and the high-temperature fluidity, deformability and low-temperature brittleness of cold patching material can be enhanced, thus reducing rutting. Yantai Huatong Company is a restructured enterprise of Longkou Transportation Bureau, formerly known as the county and township highway maintenance emergency center of Longkou City. It is the earliest manufacturer of asphalt cold patching materials in China. 3000 asphalt mixing station is used for mass production, with good uniformity and complete testing equipment.
Elaboration on cold patching technology of Yantai Huatong Company;
In road maintenance engineering, compared with the traditional concept of high temperature hot repair, normal temperature or low temperature cold repair is adopted. Cold patching materials are cold patching materials, in English: C0 1d Patch. Specifically, asphalt cold patching material refers to a mixture of unheated mineral aggregate and diluted asphalt. According to the mixing form, it can be divided into factory mixing and on-site mixing.
Before 1998, there was no real cold patching material in road maintenance engineering in China, only water-based emulsified asphalt material was used for normal temperature patching. After 2000, Yantai Huatong Company introduced the first asphalt cold patching material with stable performance. As a high-tech product, cold patching materials have been widely used in national highways, county and township highways and municipal roads.
Compared with ordinary hot mix, asphalt cold patching material is a high-tech road patching material, which can be used all day. It is suitable for repairing different types of pavements in any weather and environment, such as asphalt, cement concrete pavements, parking lots, airport runways, bridge expansion joints, etc.
Formation mechanism of asphalt cold patching material;
The strength forming process of asphalt cold patching material in Yantai Huatong Company is different from that of hot asphalt mixture. The asphalt used in hot asphalt mixture is thermoplastic, while the asphalt used in cold patch asphalt mixture is modified and not completely thermoplastic. The strength formation of cold patch mixture is a slow process, which is plastic and fluid when paving and rolling, and can be squeezed into irregular pits and grooves. Under the action of driving and air, some solvents volatilize, the asphalt gradually thickens, the particles of cold patching mixture are more closely distributed, the porosity is reduced, and the combination between minerals and aggregate is stronger. With the increase of mixture density, the feeling of soft pavement will gradually disappear, which takes 7- 10 days. After that, the strength will gradually increase, and its deformation and strength will gradually stabilize in about three months, reaching or exceeding the performance of hot asphalt mixture after cooling. The strength of cold patching mixture consists of two parts: one is the cohesion and adhesion of the mixture formed by the interaction between modified asphalt and mineral aggregate. They make it difficult for mineral particles to separate and form a whole, and also make the mixture have high adhesion to the original surface, which is not easy to peel off and move. The second is the internal friction resistance of the mixture formed by the embedding and locking of mineral particles after rolling. These two forces of cold patch constitute its initial strength, which is enough to resist the action of vehicle load.
Yantai Huatong Cold Patch Features:
1 All-weather maintenance materials
Huatong cold patching material is suitable for a wide range of ambient temperatures, from -30℃ to 50℃, and can timely repair pits and grooves under the harsh environmental conditions of rain, snow and humidity.
2, the construction is simple
There is no need to stick oil when using Huatong cold patching material to repair pavement pits and grooves. Raw materials can be taken at any time without heavy construction machinery, and impact compaction, manual compaction or automobile tire rolling can be adopted according to different pavement repair conditions. Moreover, the area repaired with Huatong cold patching material can be opened to traffic immediately, and the traffic is not closed, which greatly relieves the traffic pressure brought by road patching construction.
3, the application range is wide
Huatong cold patching material has good adhesion with different base materials such as asphalt concrete, cement concrete, metal surface and wood surface, and can be widely used in repairing and maintaining damaged potholes, digging potholes, repairing pavement after laying underground pipelines, around manhole covers, bridge pavements, parking lots, airport runways and parts that are difficult for construction machinery to reach.
4. Excellent quality
Huatong cold patching material road has strong anti-aging bonding performance, and the service life of the repaired pit and groove is more than 10 year, so it is not easy to fall off and crack, and it is not necessary to repair it repeatedly.
5. The maintenance cost is low.
When using Huatong cold patching material in construction, it is not limited by the weather, the size and quantity of pits, and can be taken at any time according to the actual amount when repairing. The remaining materials can be used for the next repair without wasting materials, and the utilization rate of 100% is truly achieved. It will be the most economical and effective to replace the traditional centralized repair method with immediate repair method.
6. Convenient transportation
The area repaired by Huatong cold patching material can be opened to traffic immediately without traffic closure, which can greatly alleviate the traffic pressure caused by road patching construction.
7. Environmental protection
The production and use of Huatong cold patching material will not produce pitch black smoke and waste, and the finished product is insoluble in water, so it will not pollute the atmosphere and groundwater, which is beneficial to environmental protection.
8, easy to save
Huatong cold compress can be stored indoors and outdoors without covering. If bulk materials are stored, it is recommended to store at least 20 ~ 30 tons of cold patch and pile it into a pyramid shape. The shell formed for a long time can be mixed with internal loose materials for use. Bulk materials can be stored for more than two years, but they can be stored in bags indefinitely without caking. During low-temperature construction, it should be stored in a warehouse above 5℃ for 24 hours.
9. Significant social benefits.
Using Huatong asphalt cold patching material can timely repair pits and grooves, keep the pavement smooth and beautiful, ensure smooth roads, reduce pavement patching times and workload, and prolong the service life of roads.
Huatong asphalt cold patching material introduced by Yantai Huatong Company is a high-tech road patching material. The core material is imported from America, with stable performance and high viscosity. It can be used in all weather from -30℃ to 50℃, and is suitable for repairing different types of pavements in any weather and environment, such as asphalt, cement concrete pavements, manholes, parking lots, airport runways, bridge expansion joints, etc.
Construction technology of asphalt cold patching material in Yantai Huatong Company;
1, pit cleaning
Determine the excavation position of the pit. After milling or slotting around, clean up the gravel and waste residue in and around the pit to be repaired. There shall be no mud, ice and other sundries in the pit. The repaired pit should be trimmed and cleaned up, and the waste residue should be removed until a solid surface is seen.
2. Brush the interface agent
Brush the interface agent around and at the bottom of the cleaned pit, especially around the pit.
Step 3 Fill the pits and grooves
Fill the pit with enough cold patching material until the filler is about 1. 5 cm above the road. After filling, the center of the pit should be slightly higher than the surrounding road surface, showing an arc shape. When the depth of the pavement pit is greater than 5cm, it should be filled in layers and compacted layer by layer, with each layer being 3 ~ 5cm.
Step 4 compact
After laying evenly, according to the site environment, the size and depth of the repair area, choose the appropriate compaction tools and methods for compaction. Such as automobile tire compaction, manual tamping, vibrating plate tamping and rolling. When repairing a high-grade highway, the periphery and corners of the repair area should be fully compacted.
5. Open traffic
It can be directly opened to traffic after compaction.
Storage and packaging:
Keep in a cool place, away from fire sources. Packing: 50kg/bag. The shelf life is 2 years.
Yantai Huatong Road Engineering Co., Ltd. is the first manufacturer of asphalt cold patching materials in China. Its main products are: asphalt, cold joint sealant for cement pavement, joint adhesive tape, color cold patching material, interface agent, sealing asphalt, cold patching asphalt and materials for repairing broken skin and pitted surface of cement pavement.
Common repair materials for highway diseases produced by Yantai Huatong Company: 1. Asphalt cold patching can be used to repair pits and grooves, and can be directly repaired and opened to traffic; 2. Cold joint sealant can be used for cracks in cement pavement, which can be directly opened to traffic, and the cost per meter is not higher than that in 2 yuan. 3, asphalt pavement cracks can use joint tape, according to the direction of cracks, joints will be integrated with the original asphalt pavement after 2 months, will not jump, will not affect the snow removal in winter; 4. The damaged surface of cement pavement can be repaired with quick repair materials, with a 5 mm thin layer and open to traffic for 2 hours; 5. The color cold patching material can be used to pave or repair the potholes on a small area of colored pavement. At the construction site, bags can be unpacked, laid and compacted, and then they can be opened to traffic. 6. Purchasing cold patch asphalt can reduce the cost of cold patch asphalt, which is mainly composed of cold patch asphalt and stone mixed at room temperature. Purchasing cold patch asphalt can greatly save freight, and it is directly mixed with local stone (machine-made sand) at room temperature. Each ton of cold patch asphalt can mix 24 tons of synthetic cold patch materials, which is easy to operate.
B cold patch asphalt
I. Product introduction:
Yantai Huatong cold patch asphalt is an incomplete thermoplastic modified asphalt mixture, which has obvious advantages of direct pouring and high performance. It consists of road asphalt, diesel oil, cold patching additive, anti-stripping agent, anti-rutting agent and styrene-butadiene rubber. It is liquid and viscous at room temperature, and its properties are stable. It is the core raw material for producing cold patching materials. The strength of cold patch formed by mixing cold patch asphalt and stone is composed of the cohesiveness and adhesiveness of modified asphalt itself and the cohesiveness and adhesiveness of mixture formed by interaction with mineral aggregate, which makes it difficult for mineral aggregate particles to separate and form a whole, and also makes the mixture have high adhesiveness with the original surface, and is not easy to peel and push. The direct-cast cold patch asphalt developed by our company is mainly to solve the problem of high long-distance transportation cost of cold patch materials, and can provide users with a whole set of production technology of cold patch materials. Users can use local stone and asphalt mixing equipment to produce their own products, so as to reduce production costs and transportation costs, produce on demand, eliminate waste and improve economic benefits.
Second, the construction technology:
1, stone preparation
The stone should be limestone or basalt, never granite. Stones with various particle sizes can be mixed as required. Stone does not contain mineral powder with particle size less than 1.5mm (if aggregate contains mineral powder, it should be screened). The stone needs to be dried, and it should be heated to dryness before mixing.
2. Cold patching asphalt
If there is precipitation, stir it evenly with an air pump or manually before use, and then pour it out of a 200KG barrel for direct use.
3. Mixing method
When the output of cold patch finished products is small, it can be directly stirred by hand with shovel or drum mixer in proportion at the construction site, but the uniformity of manual stirring or drum mixer is poor and the product performance is unstable. When the finished product is produced in batch, it can be mixed with hot-mixed asphalt concrete in a large mixing building according to the conventional method. When mixing in a large mixing plant, only one kind of aggregate is needed, that is, melon seeds (stone chips) with a diameter of 2 ~ 10mm, and mineral powder is not allowed. If the melon seeds are dry, the drying drum does not need to be heated, but can be directly stirred; Otherwise, the stone should be heated in a drying drum, but the temperature does not need to be too high. There is no special requirement for the heating temperature when the melon seeds are stirred, as long as they do not stick to the pan when stirring. Cold patch asphalt is pumped by asphalt pump. The original oil inlet pipe of asphalt pump pumping hot asphalt in the mixing building was reformed, and cold patch asphalt was extracted and mixed directly in the mixing building.
4. Dose
The content of cold patching asphalt in finished products is 4.2-4.5%, that is, 4.5 tons of finished products can be mixed 1 barrel of cold patching asphalt (200KG).
Third, architecture.
The ordinary asphalt paver can be used to pave the road surface for large-area construction, and the pit and groove repair and large-area road surface construction technology are the same as those of ordinary hot asphalt concrete.
Third, storage and packaging.
This product is a black-gray viscous liquid, which is not flammable and can be stored and transported for a long time under normal conditions.
The finished products after production must be stored in a cool place away from light and wind to avoid rain. If it is used within one month, it can be stored in the shape of a great pyramid, and the pile can be covered tightly with plastic sheets or tarpaulins; If it is not used for a long time, it is recommended to put it in a woven bag with an outer membrane. The shelf life of finished cold patch materials is 2 years. Cold patch asphalt can be divided into three formulas: summer, spring, autumn and winter, and cannot be mixed. Packing: 15/200kg/ barrel.
C cold patching asphalt sand
Product introduction
The maximum particle size of Huatong cold patching asphalt sand is 3 mm.. SBS modified cold patch asphalt independently developed by Huatong Company is made by adding 3mm basalt macadam. It can be constructed at -30 ~ 50 degrees, with good workability and simple operation. It is mainly used for crack treatment in front of asphalt concrete reinforcement cover, tank bottom corrosion protection and filling on both sides of railway track.
1, crack treatment
Before the highway overhaul of asphalt concrete overlay, it is necessary to deal with the reflection cracks and disease cracks of the old pavement, use a special slotting machine or milling machine to track the slotting or milling along the cracks, use a dust collector to clean the grooves, then use asphalt sand to fill the cleaned grooves, and then evenly pave asphalt concrete.
2. Corrosion protection of tank bottom
It is mainly suitable for moisture-proof and anti-corrosion treatment of the bottom of large iron storage tanks. Generally, a layer of asphalt sand with a thickness of 10 cm is laid on the cement concrete of the tank, which plays a waterproof and anticorrosive role after compaction.
3. Filling on both sides of the rail
Due to the rigid impact of rail for a long time, the fillers on both sides are prone to cracking and other problems. After asphalt sand is filled on both sides of the rail and compacted, it can absorb the stress caused by rail impact because of its good flexibility.
3. Storage and packaging
Keep in a cool place, away from fire sources. Packing: 50kg/bag. The shelf life is 2 years.
D color cold patching material
Color cold patching material is a high-tech color pavement maintenance material independently developed by Huatong Company with independent intellectual property rights, with high viscosity and stable performance. It is mainly used for paving small colored pavement below 2000 square meters or repairing potholes. It does not need on-site heating and stirring. After manual unpacking and paving, it is very convenient to compact with a roller or compactor. The paving thickness can reach at least 1.6cm, which can greatly reduce the construction cost, reduce the chromaticity attenuation caused by ultraviolet radiation, and has bright colors, strong chromaticity stability and convenient construction.
building technology
1, before repairing the pit and groove
2, artificial leveling
3. Compaction
Step 4 form
Storage and packaging
Keep in a cool place, away from fire sources. Packing: 50kg/bag. Shelf life 12 months.
E-color cold rehydration solution
I. Product introduction:
Yantai Huatong color cold patching liquid is a kind of modified colloid mixed liquid without complete thermoplasticity, which has obvious advantages of direct pouring and high performance. It consists of glue imported from Iran and various additives. It is liquid and viscous at room temperature, and its properties are stable. It is the core raw material for producing color cold patch. The strength produced by mixing stone with cold rehydration solution consists of the cohesiveness and adhesiveness of the modified glue itself and the cohesiveness and adhesiveness of the mixture formed by the interaction with mineral aggregate, which makes it difficult for mineral aggregate particles to separate and form a whole, and also makes the mixture have high adhesiveness to the original surface and is not easy to peel and move. The direct color cold patching liquid developed by our company is mainly to solve the problem of high long-distance transportation cost of cold patching materials, and can provide users with a whole set of production technology of cold patching materials. Users can use local stone and asphalt mixing equipment to mix color powder to produce their own products to reduce production costs and transportation costs, and mix as needed to prevent waste and improve economic benefits.
Second, the construction technology:
1, stone preparation
The stone should be limestone or basalt, never granite. Stones with different particle sizes can be mixed as required, and there is no mineral powder with particle size less than 1.5mm (if the aggregate contains mineral powder, it should be screened). Stone should be dried, otherwise it needs to be heated until it is dry before mixing.
2, color cold patch
If there is precipitation in the cold rehydration liquid, the bottom of the barrel should be heated to 80℃ with liquefied gas before use, and then it should be poured out of a 200KG barrel for direct use after being evenly stirred with an air pump or manually.
Step 3 add toner
Before the cold rehydration liquid is mixed with the stone, 2.5-2.7% of the stone is added into the toner required for the production of finished products, and then mixed with the cold rehydration liquid after being fully and evenly mixed.
4. Mixing method
When the output of cold patch finished products is small, it can be directly mixed with shovel or drum mixer by manpower in proportion at the construction site, but the uniformity of manual mixing or drum mixer is poor and the product performance is unstable. In the large-scale production of finished materials, cold rehydration liquid can be directly sent to large-scale mixed buildings to be mixed with mineral materials. When mixing in a large mixing plant, only one kind of aggregate is needed, that is, melon seeds and stones (stone chips) within the range of 1 ~ 10mm, and mineral powder is not allowed. If the melon seeds are dry, the drying drum does not need to be heated, but can be directly stirred; Otherwise, the dryer needs heating, but the temperature does not need to be too high. There is no special requirement for the heating temperature of melon seeds and stones when stirring, as long as they do not stick to the pan when stirring. The cold make-up liquid is pumped by asphalt pump, and the original oil inlet pipe for pumping hot asphalt by asphalt pump in the mixing building is reformed, and the cold make-up liquid is extracted and mixed directly in the mixing building.
4. Dose
The content of cold patching asphalt in finished products is 4.2-4.5%, that is, 4.5 tons of finished products can be mixed 1 barrel of cold patching asphalt (200KG).
Third, architecture.
Due to the incomplete thermoplasticity of cold liquid, the construction temperature should be above 10. For large-scale construction, ordinary asphalt pavers can be used for paving construction. The construction technology of pit and groove repair and large-area paving of colored pavement is the same as that of ordinary hot asphalt concrete. It is suggested that the stone particle size is 3 mm, and a thin colored pavement with the minimum thickness of 1.6 cm can be paved, which can greatly reduce the construction cost.
Fourth, storage
The cold rehydration liquid is olive green, slightly sticky and flammable, and can be transported under normal circumstances. Shelf life 1 year.
Packing: 15/200kg/ barrel.
F huatong new surface seam belt
Huatong pavement new crack adhesive tape is a new type of pavement adhesive tape with independent property rights independently developed by Yantai Huatong Company. Made of asphalt base, it has the advantages of good wear resistance, strong water sealing, low cost, high elasticity, free turning and bonding according to the crack direction, simple construction and so on. In order to ensure the sealing effect, the most important index of Huatong new caulking belt is its adhesion and compatibility with asphalt pavement. After driving for two months, the joint tape will gradually deform and squeeze into the crack, and the sealing crack will not leak. At the same time, due to its strong compatibility with asphalt, the joint tape will be integrated with asphalt pavement, and the phenomenon of vehicle jumping will not occur, and the snow shovel will not damage the joint tape during snow removal in winter. The thickness of joint adhesive tape is 3-6 mm, and the width is 3 cm and 5 cm, which are divided into flat and convex types to meet the joint adhesive needs of cracks with various widths and depths.
building technology
1, crack cleaning
Clean up cracks, without big bumps, depressions, looseness, gravel or oil stains or grease; If there is a big pit, it must be filled with quartz sand or cold patch asphalt sand.
Step 2 paste
Remove the release paper from the back of the joint tape, and stick the joint tape evenly on the road surface with the crack as the center line, with the non-adhesive surface facing upward.
3. Joint
In case of irregular cracks (seams), the seam tape can be cut off with a paper cutter or scissors, and then tracked and pasted in the direction of cracks (seams). However, at the joint of joint tape and joint tape, an overlap of 80- 100mm should be formed.
Step 4 compact
After sticking the seam tape, compact it with a hammer or roller.
G. Cold joint sealant for pavement
Yantai Huatong Road Engineering Co., Ltd. replied:
Huatong brand cold joint sealant produced by Yantai Huatong Company is a new one-component oily cold joint sealant with independent intellectual property rights, which is a national patent product. This product is a fast-curing oily material with excellent displacement resistance and waterproof performance. Absorb moisture in the air to react and solidify, with strong weather resistance, no flowing at high temperature and no brittle crack at low temperature, and can be constructed at 50℃ to -40℃. The product will not peel off after construction and rain, and it remains elastic. The color of cold joint sealant can be customized according to customer's needs to meet the needs of pavement crack treatment in various colors. It is mainly used for bonding and sealing cracks (joints) such as expansion joints, settlement joints, kerfs and construction joints of cement or asphalt pavements, squares, airport runways, roofs and basements. According to the determination, each kilogram of cold joint sealant can be used to pour cracks with a common width of 10-30 linear meters, and the total cost per meter of cold joint sealant for expansion joints, dust removal, glue pouring and gluing does not exceed that of 2 yuan.
building technology
1, joint swelling
The hand-held small saw blade seam expanding machine independently developed by Huatong Company has the advantages of small volume, light weight, free seam expanding activities and can track any turning and seam expanding.
Step 2 remove dust
Huatong's new type of eagle mouth blower is adopted to ensure the clean removal of floating dust, and at the same time completely remove the loose concrete slag left in the joint after expansion.
Step 3: filler
For wide and deep cracks, foam strips or quartz sand can be filled in the cleaned cracks before pouring glue, leaving 25px space for pouring glue.
Step 4 pour the glue
For cracks with a width less than 3 mm, it is necessary to enlarge the joint before pouring glue. Generally, the width of expansion joint is 4-8 mm, and the depth of expansion joint is 3-6 mm. Cracks with a width greater than 3 mm should be poured directly with special bags.
5. Open traffic
The surface drying time of joint sealant is less than half an hour. For cracks with a width less than 3cm, the traffic can be opened directly after pouring sealant. For wide and deep cracks, isolation sand can be laid on the surface for protection after pouring glue, or traffic can be opened after 24 hours.
6. Storage and packaging
Keep in a cool place, away from fire sources. Packing: 4 kg/bag, 30 kg/barrel. Shelf life: 24 months in bags and 0/2 months in barrels.
Yantai Huatong Road Engineering Co., Ltd. is the first manufacturer of asphalt cold patching materials in China. Its main products are: asphalt, cold joint sealant for cement pavement, joint adhesive tape, color cold patching material, interface agent, sealing asphalt, cold patching asphalt and materials for repairing broken skin and pitted surface of cement pavement.
Common repair materials for highway diseases: 1. Asphalt cold patching can be used to repair pits and grooves, and can be directly repaired and opened to traffic; 2. Cold joint sealant can be used for cracks in cement pavement, which can be directly opened to traffic, and the cost per meter is not higher than that in 2 yuan. 3, asphalt pavement cracks can use joint tape, according to the direction of cracks, joints will be integrated with the original asphalt pavement after 2 months, will not jump, will not affect the snow removal in winter; 4. The damaged surface of cement pavement can be repaired with quick repair materials, with a 5 mm thin layer and open to traffic for 2 hours; 5. The color cold patching material can be used to pave or repair the potholes of small area color pavement. At the construction site, bags can be unpacked, laid and compacted, and then they can be opened to traffic.
Interface agent (sealing asphalt)
Huatong asphalt pavement pit repair interface agent has excellent adhesion, excellent water resistance and aging resistance, which can improve the bonding strength between the periphery of pit and newly poured asphalt or cement, and effectively avoid the problems of hollowing, falling off, shrinkage and cracking at the joint of pit and groove. It is mainly used for hollowing, cracking and peeling between pits and new building concrete due to the strong water absorption or smooth interface that is not easy to adhere to the concrete surface. It can greatly enhance the bonding force between new and old concrete and around concrete pits, has strong waterproof performance, can prevent the moisture of pavement from infiltrating into the base, prolong the service life of pavement, and has remarkable economic benefits. It is an indispensable supporting material for asphalt pit repair. At the same time, it can be used for repairing and sealing loose and fallen asphalt pavement in a small range.
Available range
1, pit and groove repair
Clean the pit and groove joints that need painting.
Paint should be painted at the bottom and around the pit manually, and the film thickness should be1.5 mm.
Fill pits and grooves
Fill the pit with enough asphalt cold patching material until the filler is about l 12.5px higher than the pavement. After filling, the center of the pit should be slightly higher than the surrounding road surface, showing an arc shape. When the depth of pavement pit and groove is greater than 125px, it shall be filled in layers and compacted in layers, with each layer being 3- 125px.
4. Storage and packaging
Keep in a cool place, away from fire sources. Packing: 15/200kg/ barrel. The shelf life is 2 years.
2, asphalt pavement repair
Old asphalt pavement will appear aging phenomenon or diesel pollution caused by road accidents, which will lead to pavement looseness, falling off and other diseases. It can be repaired by smearing (brushing) interfacial agent and then sealing with stone.
Thin-layer repair material for cement pavement
Thin-layer treatment technology of cement crushing pit
Huatong high-modulus quick cement repair material is mainly used for diseases such as pockmarked surface, damaged surface and exposed reinforcement on cement pavement, which is consistent with the original pavement in terms of aesthetics, and the overall effect after construction is beautiful; High initial setting intensity, 20 minutes initial setting, 3 hours open traffic, timely relieve traffic pressure; The repairing material concrete has a compact structure and its impermeability is 2-3 times stronger than that of ordinary cement. Different from ordinary portland cement, this product is a neutral material and has no corrosion to steel bars; The product expansion rate is low, which does not affect the effect after molding; Good adhesion to concrete and strong water resistance.
building technology
Road surface cleaning: use high-pressure water gun to clean the floating soil, sundries and loose objects on the road surface. Note: no water is allowed after the surface is cleaned.
Mixing: mix according to the ratio of patching material: white latex =100:12-14. Note: Don't mix too much repair materials at one time, and work while mixing. The mortar of the mixed repair materials should be completed within 20 minutes; When manual mixing is used, it is necessary to flow, mix and construct. The construction temperature should be higher than 5℃.
Plastering: firstly, spray white latex on the cleaned cement pavement, then spread the mixed repair mortar evenly, and then use an iron trowel with a scraper to level and collect light (thin layer repair should be compacted with an iron trowel to make it dense, refer to the construction method of ordinary cement mortar);
Embossing curing: after the construction is completed, cover the film for curing for 2-3 hours. Before the initial setting of repair mortar, emboss it with an embossing machine (if necessary). Sprinkle water within three hours after initial setting, but pay attention to avoid rain or exposure on the first day.
parcel
Keep in a cool place, away from fire sources. Packing: 50 kg high-strength cement repair material/bag, 200 kg latex/barrel. The shelf life is 6 months.
Treatment technology of bridge expansion joint
1. Determine the slot width according to the actual working conditions of the pavement, saw the slot with a cutting machine after setting out, and keep the saw slot neat and straight. Pay attention to cut through the asphalt concrete when slotting to avoid the concrete outside the slot from loosening.
2. When slotting with a pneumatic pick, the slotting depth should not be less than 300px. The asphalt concrete and loose cement concrete in the tank should be chiseled clean, and the rough ones should be chiseled to the hard layer, and the floating objects and sundries should be removed with a powerful blower, especially the concrete blocks. It is forbidden for constructors to trample on the edges on both sides of the tank to avoid damaging the asphalt concrete on both sides of the tank.
3. When installing the steel beam, first ensure that the steel beam is placed horizontally, then control the elevation position of the top of the steel beam, and finally weld the steel beam.
5. All wastes generated after the installation of steel beams must be cleaned up in time to ensure the cleanliness of the construction site.
6, concrete pouring
Concrete in-situ mixing
Pour the mixed concrete into the tank.
Concrete injected by vibration. In order to ensure the compactness of concrete, especially the compactness of concrete under section steel, use vibrating rod to vibrate until there are no more bubbles.
After the concrete is vibrated and compacted, the cement slurry shall be leveled with a trowel, and it shall be plastered 4-5 times as usual. Pay special attention to flatness in this process. Too high or too low will cause the vehicle to trip. After the completion of cement concrete pouring, strictly spray water for health 1 hour, and vehicles are prohibited from passing during this period.
7. Open traffic