Effect Of Clay Minerals On The Performance Of Polycarboxylate Superplasticizer And Mechanism Research

The effects of clay minerals on the properties of polycarboxylate superplasticizer were studied,the mechanism of the interaction of clay minerals with polycarboxylate superplasticizer wasexplored, and the measures for improvement were proposed. The research showed that clay mineralsaffected the dispersion performance of polycarboxylate superplasticizer, the degree of impact wasrelated to the molecular structure of the clay minerals itself, and the impact of montmorillonite onpolycarboxylate superplasticizer was the most significant. The polycarboxylate superplasticizer withlow acid ether ratio and short side chain exhibited stronger capability of resistance to clay minerals.Aliphatics water-reduing agent was superior to polycarboxylate superplasticizer in resistance to clayminerals. The interaction of clay minerals with polycarboxylate superplasticizer was affected bysolution pH and inorganic salt ion concentration.Sodium silicate, cationic surfactant, anionic surfaceactive agent and clay stabilizer played a great role in the improvement of the impact of clay mineralson the properties of polycarboxylate superplasticizer. Clay stabilizer could be adsorbed into clayminerals interlayer of clay mineral surface, decrease the adsorption of water and swelling andprevent clay minerals from adsorption on polycarboxylate superplasticizer. XRD tests confirmed thatthe side chain of polycarboxylate superplasticizer entered the layers of clay minerals, and wasanchored in the layers of clay minerals through hydrogen bonding.