What is the effect of polycarboxylate superplasticizer on the performance of waterproof mortar?


Release time:

2015-08-03

Author:

New Earth Group

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What is the effect of polycarboxylate superplasticizer on the performance of waterproof mortar?

    Polycarboxylate superplasticizerWhat is the impact on the performance of waterproof mortar?
Effect of polycarboxylate superplasticizer on the fluidity and fluidity retention of waterproof mortar: After adding polycarboxylate superplasticizer, the initial fluidity and fluidity retention of waterproof mortar are significantly improved. The blank sample without polycarboxylic acid water reducing agent loses fluidity after 60min, and the contrast group with dispersant is still good in 60min. This is because the polycarboxylic acid dispersant inhibits the hydration of C3A and C3S in the early stage of cement hydration, so that the slurry remains plastic for a long time.
Effect of polycarboxylic acid dispersant on strength of polymer cement waterproof mortar
The compressive strength, flexural strength and bond strength of waterproof mortar at different ages can be seen, after adding polycarboxylate superplasticizer, the compressive strength, flexural strength and bond strength of waterproof mortar at different ages are improved compared with the blank sample. The dispersant containing amine group with early strength effect can improve the 7-day and 28-day compressive strength and bond strength of waterproof mortar most, which can promote the early hydration of cement and improve the early compressive strength of waterproof mortar. The uniform distribution of more small pores, it will reduce the compressive strength of the mortar block, but can improve the flexural strength of the specimen to a certain extent.
Effect of Polycarboxylate Superplasticizer on Impermeability of Polymer Cement Waterproof Mortar
The impermeability pressure of the coating and mortar specimens added with polycarboxylic acid dispersant waterproof mortar is obviously improved. Polycarboxylic acid dispersant can improve the fluidity of waterproof mortar and reduce the amount of mixing water, thus reducing the number of pores in waterproof mortar, improving the compactness of coating and mortar, blocking the passage of water through, and increasing the resistance of passage, so as to improve the impermeability of waterproof mortar.
Effect of Polycarboxylate Superplasticizer on Volume Shrinkage of Polymer Cement Waterproof Mortar
The hydration and hardening process of cement in waterproof mortar will produce chemical shrinkage, and the mortar itself will also produce dry shrinkage due to water loss. Volume shrinkage has an important influence on the durability of waterproof mortar, and the volume shrinkage after hardening directly affects whether the bonding with the base is firm, whether it produces hollowing, cracking and cracks. With the extension of specimen curing age, the shrinkage rate of waterproof mortar increases, and its volume shrinkage mainly occurs in the early stage of mortar hardening. The addition of polycarboxylic acid dispersant can effectively reduce the early and late shrinkage of mortar. The dispersant can reduce the amount of mixing water, improve the early strength development of the mortar, make the mortar structure more dense, effectively improve
Good volume shrinkage of mortar.
聚羧酸减水剂

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