Study On The Performance Optimization Of PASP Superplasticizer

In this work, we mainly focused on the performance optimization of PASP superplasticizer. In order to investigate the influence of modification on PASP, pristine PASP and modified PASP hybridized with calcium wood, naphthalene and amino sulfonate superplasticizer, were used in cement paste and concrete, respectively.PASP with various molecular weights were initially synthesized via a one-step polymerization. The as-synthesized PASP was then modified by taurine and ethanolamine, which could introduce hydroxyl groups, sulfonic acid groups and carboxyl groups into the molecular chain. In order to study the effect of superplasticizer on the dispersion of the cement particles, different type of superplasticizers and hybridized superplasticizers with PASP loading were synthesized, respectively. Compatibility between the calcium wood, naphthalene, amino sulfonate and modified PASP could be reached by comparing the experimental results. In terms of the study on concrete, fluidity, slump loss, strength and the clay sensitivity were firstly measured by using different pristine superplasticizers. Experimental results showed that the modified PASP could effectively improve the concrete fluidity, with low sensitivity to the dirt in fine aggregate. Orthogonal design was then conducted to optimize the composition of the hybridized superplasticizers. The fluidity, slump loss, strength, durability and clay sensitivity were measured in the optimized superplasticizer. FT-IR and Zeta potential analysis were conducted to verify the successful graft of functional groups and possible mechanism.The results showed that three different optimized compositions could be obtained by using the orthogonal design. All test data showed that compared with the pristine PASP, hybridized superplasticizers showed enhanced performance.