The function of asphalt pavement construction technology in 1 highway construction
In order to improve the construction effect of asphalt pavement, ensure the smoothness and compactness of pavement and effectively meet the needs of vehicle traffic, the construction unit must strictly implement the construction technology of asphalt pavement.
1. 1 Ensure the smoothness of asphalt pavement.
Strengthen the quality control of construction raw materials, strictly design the mixture ratio, and implement the paving and rolling construction technology. It can not only promote the smooth progress of construction, but also help to successfully complete the construction task, improve the smoothness of the road surface, ensure the beauty of the road surface, enhance the comfort and safety of driving, and create favorable conditions for the smooth passage of vehicles.
1.2 to prevent quality defects.
If we don't pay attention to the implementation of asphalt pavement construction technology and ignore the application of new technology and new technology, it is not only difficult to ensure the quality of highway engineering, but also prone to quality defects under the influence of vehicle load and natural environment. Therefore, construction personnel should pay attention to prevent quality problems, master technical points and make scientific construction plans. Strengthen the quality control of each construction link of asphalt pavement and give full play to the role of new technology. At the same time, in the paving and rolling of asphalt pavement, appropriate construction machinery and equipment are selected, and layered filling and rolling methods are adopted to ensure the compactness of pavement, improve the smoothness of pavement, effectively bear traffic load and avoid quality problems.
1.3 improve the project quality and benefit
In the construction of asphalt pavement, if unqualified raw materials are used, the construction technology is not implemented, and the process quality control is not paid attention to, it is easy to cause cracks, subsidence and other problems. Once these problems occur, it will not only increase the difficulty of maintenance and unnecessary capital expenditure, but also restrict the improvement of project quality and efficiency. Implementing asphalt pavement construction technology, strengthening process quality control, paying attention to construction site management, and effectively implementing new technologies and new processes can ultimately ensure the quality of the project, prevent unnecessary losses, and have a positive effect on improving the project efficiency.
2 asphalt pavement construction technology in highway construction
Implementing construction technology is an important content of highway construction. Therefore, in the construction process, the construction personnel should make clear the technological process, grasp the technical points, and comprehensively take the following technical measures to carry out asphalt pavement construction.
2. 1 mixture ratio technology
Before the formal production of asphalt mixture, in order to strengthen quality control and promote the improvement of engineering construction effect, it is necessary to carry out strict tests on raw materials and obtain accurate and detailed data indicators to ensure the quality of asphalt, coarse and fine aggregates and additives. When raw materials are transported to the construction site, the construction unit should take corresponding covering measures to strengthen moisture-proof and waterproof work to ensure the comprehensive performance of raw materials. According to the requirements of construction specifications, combined with the basic situation of the construction site, the mixture ratio is carefully designed to ensure the accurate quality of raw materials and do a good job of mixing. Pre-mixing should be carried out before asphalt mixture mixing, and it is helpful to better guide the formal mixing construction by knowing the parameters and indexes in detail and determining the addition amount of raw materials, mixing time and mixing temperature [1]. Marshall and core sample tests should be carried out when mixing to understand the porosity of the mixture and the amount of raw materials added. It is helpful to ensure the quality of the mixture, promote the better play of the role and lay the foundation for improving the quality of asphalt pavement engineering.
2.2 Asphalt pavement paving technology
After the mixture is mixed, it will be transported to the highway construction site by 15t dump truck. In order to ensure that the mixture temperature meets the construction requirements and avoid segregation, the transportation distance of asphalt mixture should be strictly controlled. At the same time, transport vehicles should be covered with tarpaulins to achieve the purpose of heat preservation and ensure the good performance of the mixture. When discharging, assign special personnel to command to ensure site safety. After unloading the mixture, the paving construction should be carried out slowly, evenly and continuously at a speed of 2 ~ 6m/min. Pavers should strengthen the study of construction specifications and standards, and operate paver machinery and equipment in strict accordance with the requirements to ensure the paving construction effect [2]. During the whole paving process, be careful not to brake suddenly or stop at will, which is beneficial to ensure the smoothness of asphalt pavement. In order to ensure the paving effect of asphalt mixture at the intersection of highway engineering, after paving the mixture by mechanical equipment, it should be leveled manually.
2.3 Asphalt Pavement Rolling Technology
Asphalt mixture should be rolled immediately after paving. Rolling is the key link of asphalt pavement construction, which directly affects the compactness of pavement and plays an important role in ensuring the stability and reliability of the whole highway project. Therefore, the construction personnel should strengthen the study of rolling construction technology, master the key points of rolling construction, and realize the effective control of asphalt pavement compactness. Usually, large-tonnage roller is selected for rolling construction, which is beneficial to ensure the compactness of asphalt pavement. It is necessary to strictly strengthen the quality control of initial pressure, secondary pressure and final pressure to ensure that the rolling construction is carried out slowly, evenly and continuously at a speed of 1.5 ~ 3.5 km/h [3]. First carry out edge rolling construction, and then complete the intermediate rolling construction task until the wheel tracks disappear and the degree of compaction is qualified. On-site inspection shall be carried out immediately after the completion of the rolling construction task, and the defects shall be reworked immediately to ensure that the compaction degree of each part of the asphalt pavement is qualified.
2.4 asphalt pavement maintenance technology
After the paving and rolling construction is completed, the asphalt pavement shall be maintained. Health preservation construction should be paid attention to, and this work can not be ignored. Usually the pavement is covered with straw bags or geotextiles, and the asphalt pavement is maintained in a natural state, and the maintenance time is generally not less than 7 days. Strengthen traffic control during health maintenance, and prohibit vehicles and pedestrians from passing. After the maintenance, the quality of asphalt pavement is qualified and meets the requirements of construction specifications before it can be opened to traffic.
3 asphalt pavement construction quality control strategy in highway construction
In order to achieve better results in highway engineering construction, construction personnel should not only implement the construction technology, master the technological process, but also take quality control measures.
3. 1 raw material quality control
Asphalt pavement construction personnel should fully understand the role of raw material quality control and put it in an important position. Purchase raw materials such as asphalt, coarse aggregate and admixture from reliable suppliers to ensure the timely supply of raw materials and meet the needs of site construction. According to the requirements of technical specifications and inspection procedures, raw materials are inspected, data indicators are obtained in detail, and analysis is done to ensure the quality of raw materials is qualified. Materials transported to the construction site should also be covered in time to avoid rain erosion, ensure the comprehensive performance of materials, promote the smooth construction of asphalt concrete, and achieve better results in highway engineering construction.
3.2 Quality control of construction machinery and equipment
According to the construction quality control objectives, construction progress, time limit for a project objectives and quality control requirements, select the appropriate construction machinery and equipment. Strengthen the inspection of transportation equipment, mixing equipment, paving equipment and rolling equipment. Ensure that all indicators are qualified and the comprehensive performance of the equipment is good, so as to effectively meet the construction needs and lay the foundation for improving construction efficiency. In the whole process of asphalt pavement construction, we should pay attention to the maintenance of construction machinery and equipment, eliminate potential safety hazards in time, pay attention to equipment upgrading and updating, and ensure the comprehensive performance of construction machinery and equipment, so as to lay a foundation for improving construction efficiency and ensuring project quality.
3.3 Quality Control of Mixture
Before formal mixing, the mixture ratio test should be strictly carried out to ensure that all indicators are qualified and meet the requirements of construction specifications. Mix the mixture in strict accordance with the requirements, strengthen the control of mixing temperature and time, and reasonably control the amount of water added to ensure that the water consumption of the mixture is appropriate. In the mixing process, careful observation and analysis should be carried out to ensure the quality of the mixture, improve the workability and compactness of the mixture, prevent segregation, and create conditions for improving the quality of asphalt pavement engineering.
3.4 Pavement detection and quality evaluation
After the completion of the asphalt pavement construction task, the pavement engineering quality inspection should be carried out as required to evaluate the engineering quality. After testing and quality evaluation, we can master the basic situation of the project construction in detail, evaluate objectively, repair the existing quality defects in time, and ensure the construction effect. In addition, in the whole process of asphalt pavement construction, we should strengthen the quality inspection of raw materials, attach importance to the temperature control of mixture, and strengthen the quality inspection of asphalt pavement. Once the pavement density or thickness is found to be insufficient, repair measures should be taken immediately until the quality is qualified [4]. In the process of paving and rolling construction, we should also pay attention to the detection of loose paving thickness and compaction degree. For the part with insufficient compactness, it needs to be reworked immediately to ensure the compactness of the pavement. After the completion of the project, the project quality should be evaluated objectively, fairly and in detail, and the acceptance work should be done well to ensure the construction effect and project quality.
4 conclusion
Asphalt pavement is not only good in smoothness, low in driving noise and high in comfort, but also simple in technological process and reasonable in cost, so it is widely used in highway engineering construction. Construction units should fully understand the function of asphalt pavement, strictly implement construction technical measures and strengthen quality control in highway engineering construction. In addition, it is necessary to follow the technological process, grasp the key points of quality control, ensure the compactness and smoothness of the pavement, and improve the aesthetics of the pavement. Strengthen the quality control of asphalt pavement engineering from many aspects to make it play a better role in highway engineering construction.
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