Concrete admixtures refer to organic substances added to improve and adjust the properties of concrete. The use of concrete admixtures in construction projects is increasingly valued. The addition of water-reducing admixtures has a certain effect on improving the properties of concrete. However, the use, addition methods and adaptability of water-reducing admixtures will seriously affect its transformation. .
Classification
1. A water-reducing agent that improves the mixing and transportation properties of concrete. Including various types of water reducing agents, air entraining agents and pumping agents, etc.
2. A water-reducing agent that adjusts the initial setting time and hardening characteristics of concrete. Contains retarder, retardant and accelerating agent, etc.
3. Water-reducing agent that improves the performance of concrete. Contains air-entraining agents, waterproof coatings, rust inhibitors, etc.
4. Water-reducing agent that improves other properties of concrete. Contains air-entraining agents, expansion agents, additives, antifreeze, waterproof coatings and pumping agents, etc.
Water reducing agent has the following effects in improving the properties of concrete:
(1) It can reduce the water demand of concrete. Or it can improve the quality of concrete without increasing the water demand. degree of swimming.
(2) The initial setting time of concrete can be adjusted.
(3) Reduce bleeding and segregation. Improve workability and resistance to water washing.
(4) It can reduce slump damage and improve the pumpability of pumped concrete.
(5) It can reduce shrinkage. Adding expansion agent will also compensate for shrinkage.
(6) Reduce the early stage hydration heat of concrete. Reduce the leakage current rate of large-volume concrete and reduce the occurrence of gaps.
(7) Improve the initial strength of concrete. Avoid freezing and cleaning at negative temperatures.
(8) Improve strength, cold resistance, waterproof concrete, abrasion resistance, and corrosion resistance.
(9) Use alkali-stone reaction to prevent the steel from rusting and reduce the spread of chloride ions.
(10) Made into concrete with other unique characteristics.
(11) Reduce the viscosity coefficient of concrete, etc.
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