Study on the Molecular Structure, Adsorption and Hydration Properties of Different Typed Polycarboxylate Superplasticizers

摘要

The water-reducing typed PCE (KZJ-1) has a short branched chain and a long main chain structure, while the structure of early strength typed PCE (KZJ-2 and KZJ-3) with a long branched chain and a short main chain. A detailed investigation on the chemical structure of different typed PCEs was characterized by GPC and particle charge density test. The effects of superplasticizer on dispersion, retarding stability and strength development are studied at the same time by paste and concrete. The superplasticizer was placed into different concentration to test the surface tension. The amount of adsorption and hydration heat were carried by TOC and TAM AIR. The molecular chain of KZJ-2 and KZJ-3 stretches more than KZJ-1 in the alkaline environment of concrete. The KZJ-2 and KZJ-3 can accelerate cement early hydration, shorten the induction period significantly, promote the hydration of C3A, and accelerate the formation of AFt.