When are admixtures such as water-reducing agent, retardant and additives added to concrete? ?
What role does water reducing agent play in concrete? You will also know when it was added.
Answer: Adding water reducing agent when mixing concrete can play the following three roles:
①. While keeping the concrete mix ratio and water-cement ratio unchanged, the fluidity of concrete can be improved , without reducing the strength of concrete;
②. While maintaining fluidity and water-cement ratio unchanged , can reduce water consumption and cement consumption, thereby saving cement;
③, while maintaining fluidity and cement consumption Without changing the water-cement ratio, the water-cement ratio can be reduced, thereby improving the strength and durability of concrete.
Retarder is mainly used when the temperature is high and the transportation distance is long to prevent concrete mixing. Premature solidification occurs and the material loses its plasticity, which affects the pouring quality and prevents the occurrence of cold joints (during the layered pouring of larger volumes of concrete, if the lower layer has initially set and then the upper layer is poured, a gap will be formed between the upper and lower layers of concrete. Weaker cementing surface) and other quality accidents.
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