How to know the usage density of early strength water reducing agent

The side chains of early-strength superplasticizers have an important impact on the dispersion and dispersion retention of cement particles. The smaller the degree of polymerization of the side chains, the greater the fluidity loss of the cement slurry. Fast. Due to the steric hindrance effect, the synthesized high-efficiency water-reducing agent with polyoxyethylene side chains increases as the side chain grows, and the steric effect of the water-reducing agent increases, so the dispersion effect on cement particles is better and the flow is better. The retention is also increased, but when the early strength side chain is too large, entanglement may occur between the branch chains and bridges are formed between cement particles, which in turn affects the fluidity retention

Maister Construction Engineering used the latest early strength technology from Germany to study the methacrylic acid ethylene glycol graft copolymer early strengthis a high-efficiency water reducing agent and believes that it has Polyethylene glycol of different lengths can simultaneously achieve higher fluidity and fluidity retention properties. The methylacrylic ethylene glycol graft copolymer contains carboxylic acid functional groups, sulfonic acid functional groups and alkoxy polyethylene glycol functional groups, with long side ChainpolymerEthylene glycol's early-strength superplasticizer has high three-dimensional repulsion, short dispersion time, and good dispersion and fluidity. However, the fluidity retentionis poor; the early-strength superplasticizer containing short side chain polyethylene glycol has a long dispersion time and good fluidity retention.

Finally, the dispersion performance of early-strength superplasticizers with shorter main chains and longer branch chains is better than those with longer main chains. Early-strength superplasticizer with shorter branched chains. Therefore, a graft copolymer with an appropriate length on the main chain and early strong side chains can obtain both the required fluidity and the retention of fluidity.

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