Whether the concrete is properly maintained has a great influence on its strength. 1. Concrete without proper maintenance may lose 20 ~ 40% of its due strength. The water retention rate of concrete curing agent is 0.030 ~ 0.055 g/cm, which is easy to spray and is an essential engineering material for major projects.
First, the characteristics:
1. Concrete curing agent is a neutral compound, which has no corrosive effect on concrete and is harmless to people and animals.
2. The film formed by concrete curing agent can effectively prevent the moisture inside and on the surface of concrete from escaping with the wind and evaporating under the sunlight, so that the hydration can be fully completed.
3. The concrete curing agent cannot be used or avoided when it is below 4℃ and above 60℃, and it shall be kept for two years.
4. The waterproof film formed by easy spraying (or daubing) of concrete curing agent is flexible and continuous, without cracks and pinholes visible to the naked eye. It can be touched by hand within four hours and is not sticky after drying.
5. Spray (or smear) ALC- 100 1 on the fresh concrete, which is milky white and becomes a transparent film after drying (according to CNS 2 178. The first, second and first types of specifications are collectively referred to as.
Type 1).
6. In the construction environment where the temperature difference between day and night is more than 25℃, ALC- 1002 (CNS 2 178, Type III and Type A, ASTM C309 "Type 2") can be purchased and sprayed to form a film.
It has white luster, has the ability to reflect sunlight, reduces the volume change and failure strength of concrete caused by temperature difference, and is generally called type 2.
7. The concrete curing agent can meet the requirements of CNS 2 178, ASTM C309, C 156 and AASHTO M 148.
Second, the usage and dosage:
Before spraying concrete curing agent, it should be fully stirred and shaken to make it uniform. When there is no floating water (bleeding) on the surface of concrete or paint layer, concrete curing agent can be sprayed as soon as possible. If it is spray, you can use 1/2.
About 3/4 horsepower, air pressure 35 5
At 100 psi, it can spray or spray agricultural ... sprayers smoothly. If roller brush is used for construction, concrete will be carried out after final setting. Measure according to the design requirements. Each gallon is about16 ~ 20m2 or 250g/m.
About 200 grams/square meter.
Third, the more correct usage:
1. The elevation and slope are divided into two parts. Spray or smear evenly for the first time, and the dosage is 65438+6/00 of the area. After about 40~60 minutes, the surface appears transparent or translucent, that is, spray twice, and the dosage is 65438+4/00.
2. The horizontal plane should be completed at one time. If it is uneven, it is best to complete it in two times. Avoid sprinkling water or getting wet within 4 hours after maintenance. If you spray water or get wet within 2 hours, you should maintain it again, and it should be maintained for 2~4 hours.
Semi-curing, more than 4 hours, that is, no scruples.
Fourth, the use:
In order to prevent water evaporation, the surface of fresh concrete can not be hydrated, resulting in cracks, fractures and obvious strength loss.
Verb (abbreviation of verb) Note:
The curing agent of concrete is emulsified with various agents such as oil wax and resin. If secondary construction is needed, the joint surface, wall surface and steel bar should be isolated when spraying, and the plane secondary construction can be carried out only after the surface is planed with a planer. In case of the above situation, please buy pure resin curing agent from our company.