Year1
- 袋装：
- 40kg
Concrete high-efficiency expansion and anti-crack waterproofing agent is a rigid anti-crack waterproofing material formulated from a variety of organic and inorganic components. It not only contains high-efficiency expansion and anti-crack components, but also the high-efficiency expansion and anti-crack components of Tianjin Yansheng Concrete Admixture Co., Ltd. agent, and is equipped with a plastic expansion component, an anti-seepage and shrinkage reduction component, which successfully combines the expansion and shrinkage reduction after plastic expansion and hardening to achieve the dual purpose of waterproofing and crack resistance. The performance of this anti-cracking waterproofing agent can not only meet the requirements of the "Concrete Expansion Agent" standard, but also meet the requirements of the concrete waterproofing agent in the "Mortar Concrete Waterproofing Agent" standard. In order to adapt to the development needs of commercial pumped concrete and meet the requirements of different projects with different temperature conditions and different concrete strengths, the concrete anti-crack waterproofing agent can also be formulated to have anti-seepage, anti-crack, water reduction, slow setting, early strength, high strength, anti-freeze and Pumping and other functions.
Quality Index
The anti-crack waterproofing agent is a powdery product with low alkali content, no chlorine, and no corrosion to steel bars
The fineness screen residue is less than
The water content is less than
chlorine Ion is less than
Technical performance
Adding waterproofing agent accounting for the amount of cementitious material in concrete can, in addition to the plastic shrinkage of water-reducing concrete, produce a micro-expansion of more than 1/10,000 for the hardened concrete. Compensate or reduce the volume shrinkage of concrete. Because it contains anti-seepage dense components and shrinkage-reducing components, the later shrinkage of concrete is small, and the compactness of concrete is further improved than concrete mixed with expansion agents.
The expansion stability period of the concrete anti-crack waterproofing agent is short. Generally, there will be no large expansion after a few days, and it will have no impact on the later strength.
Adding anti-crack waterproofing agent to concrete can greatly improve the impermeability of concrete. Under appropriate conditions, the anti-permeability grade of concrete can be greater than The concrete with the agent has good cohesion and is not easy to separate and bleed, so it can effectively prevent the appearance of honeycomb pits.
Concrete containing high-efficiency expansion agents and anti-crack waterproofing agents can achieve seamless construction of ultra-long structures.
The early expansion of the anti-crack waterproofing agent is fast and the expansion rate is large, which is suitable for the characteristics of the current cement that is generally thinner and develops faster in early strength and cracks appear earlier.
Scope of use
Due to its excellent anti-crack and anti-seepage properties, the anti-crack waterproofing agent is especially suitable for the following projects
Underground projects, such as subway tunnel underground garage civil air defense projects and basements of high-rise buildings, etc. Post-pouring tape can be reduced or eliminated, allowing for seamless construction of extra-long structures.
Projects with high anti-seepage and anti-cracking requirements, such as pools, sewage treatment plants, storage tanks, dams, etc.
Rigid self-waterproof roof anti-seepage mortar layer and moisture-proof mortar layer, etc.
Anchorage of building joint frame structure joints.
Principle of action
Four aspects of measures are adopted to address the shrinkage characteristics and waterproofing needs of concrete at different stages.
Compensate for the plastic shrinkage of concrete
For hardened concrete, the anti-crack waterproofing agent contains a plastic expansion component, which can compensate for the plastic shrinkage of concrete
Under restraint conditions, the hardened concrete Micro-expansion is produced, and the pre-compressed stress is generated to compensate for the dry shrinkage and cold shrinkage of concrete.
Due to the addition of shrinkage-reducing components and compaction waterproofing components, the shrinkage of concrete is further improved, which can reduce the later shrinkage of concrete and further improve the compactness and waterproofness of concrete.
Waterproof Mechanism
In addition to producing a large amount of ettringite to fill the capillary pores of the concrete, the concrete mixed with anti-crack waterproofing agent also introduces imported organic waterproofing components to further seal the concrete through the film-forming principle. The capillary pores further improve the impermeability of concrete compared with that of expansion agent concrete.
The difference between anti-crack waterproofing agent and expansion agent
One of the main components of anti-crack waterproofing agent is a high-efficiency expansion agent produced by Tianjin Yansheng Concrete Admixture Co., Ltd. The performance of this expansion agent is the same as that of the world's most recognized A good expansion agent is similar to the one in Japan. Of course, its performance is much better than other expansion agents currently available in China.
Anti-crack waterproofing agent contains plastic expansion components and shrinkage reducing components, which can significantly reduce the plastic shrinkage of concrete before hardening. After the concrete hardens, it will produce micro-expansion just like the pure expansion agent. The pure expansion agent does not have the function of plastic expansion and only produces micro-expansion after hardening. That is, the anti-crack waterproofing agent has a double expansion function, which is a different concept from the double expansion source of the expansion agent.
Because it contains organic waterproofing components, the anti-cracking waterproofing agent can meet the dual standards of waterproofing agent and swelling agent at the same time, while the simple swelling agent cannot meet the standard requirements of waterproofing agent.
Concrete mixed with expansion agents will produce micro-expansion in the early stage, and will also shrink in the dry state, forming a large gap between expansion and contraction. When the gap is too large, the expected crack resistance cannot be achieved. The effect may even be counterproductive. The difference between the expansion and contraction of the anti-crack waterproofing agent is greatly reduced, that is, the later shrinkage of the anti-crack waterproofing agent is small.
At present, cement is generally thin and hydrates quickly in the early stage. The expansion component of the anti-crack waterproofing agent does not absorb the calcium hydroxide in the cement hydration reaction, but directly reacts with water to produce micro-expansion. Therefore, it reacts with cement water The chemical reaction is relatively matched and can exert a better expansion effect in the early stage.
The waterproofing mechanisms are different. The waterproofing mechanism of the expansion agent is to produce ettringite to fill the capillary pores, while the anti-crack waterproofing agent not only produces ettringite to fill the capillary pores of the concrete, but also adds organic waterproofing components to seal the capillary pores of the concrete. hole.
The difference between anti-crack waterproofing agents and other waterproofing agents
There are many types of waterproofing agents, including traditional waterproofing agents and micro-expanding waterproofing agents. Traditional waterproofing agents basically do not have micro-expanding properties and only improve the strength of concrete. compactness. Therefore, most waterproofing agent factories now absorb the micro-expanding function of the expanding agent and produce expanding agent waterproofing agents. However, the basic formula is very simple, which is the expanding agent high-efficiency water-reducing agent. The function of the water-reducing agent is used to meet the needs of waterproofing agents. The formula principle of the anti-crack waterproofing agent is completely different from that of the intumescent waterproofing agent currently on the market. The anti-crack waterproofing agent does not add high-efficiency water-reducing agents. It meets the waterproofing agent standards by relying on the added non-reducing water-reducing agent. The waterproofing component of water. Of course, according to the needs of the user, the anti-crack waterproofing agent can also be added to the water-reducing agent pumping agent to meet the pumping requirements.
At present, there are still a small amount of liquid waterproofing agents on the market, which are prepared using water-reducing agent densifying agents and basically have no micro-expansion effect.
Precautions for use
Addition method
The substitution rate of the total cementitious material.
Amount of anti-crack waterproofing agent/*
where is the amount of anti-crack waterproofing agent, which is the amount of cement in the concrete mix ratio
is fly ash, which is the anti-crack waterproofing agent.
When calculating the dosage of anti-cracking waterproofing agent, the excess replacement part of fly ash must be taken into consideration.
Determine the amount of anti-crack waterproofing agent according to the anti-crack needs of different parts.
Recommendations
Base slab, mass concrete above
Wall, above concrete recommendation
Floor slab
Mass concrete must be carried out in accordance with the technical requirements for mass concrete construction, and It cannot be omitted because of the addition of anti-crack waterproofing agent.
In view of the fact that the current cement is generally too fine, when selecting pumping agents, retarding type pumping agents should be used as much as possible.
Concrete curing has a great influence on concrete cracks and must not be omitted because of the addition of anti-crack waterproofing agents.
After adding anti-crack waterproofing agent, the concrete must also be vibrated according to the specifications.
If this waterproofing system is adopted, in view of the fact that the partial exterior walls of some current projects may have the retaining piles and retaining walls processed and directly used as exterior molds to pour waterproof concrete due to site problems. Since the exterior walls cannot be strengthened, it is recommended , grouting pipes are pre-buried at the construction joints for waterproof grouting reinforcement.
Contact information Contact person Liu Xiaohong
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