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Different Effects of NSF and PCE Superplasticizer on Adsorption Dynamic Yield Stress and Thixotropy of Cement Pastes

机译:NSF和PCE高效减水剂对水泥浆的吸附动态屈服应力和触变性的不同影响

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摘要

This study compares the differences and similarities of two types of superplasticizers—NSF (Naphthalene Sulfonate Formaldehyde) and PCE (PolyCarboxylate Ester)—in fresh cement paste systems, in terms of adsorption, dynamic yield stress, and thixotropic index. Results show that with either NSF or PCE addition, the more superplasticizer is added, the more it is adsorbed and the more it remains in the interstitial pore solution. The dynamic yield stress and thixotropic index also decrease with increasing addition the amount of either superplasticizer. However, NSF is less efficient in decreasing the dynamic yield stress than PCE. More importantly, the decreasing patterns of dynamic yield stress and thixotropic index are different with NSF and PCE additions; this is tied to the adsorption and dispersing mechanisms of these two types of superplasticizers.
机译:这项研究从吸附,动态屈服应力和触变指数方面比较了新鲜水泥浆体系中两种类型的高效减水剂(NSF(萘磺酸甲醛)和PCE(聚羧酸酯))的异同。结果表明,添加NSF或PCE时,添加的减水剂越多,被吸附的越多,并且残留在间隙孔隙溶液中的次数也越多。动态屈服应力和触变性指数也随着两种高效减水剂添加量的增加而降低。但是,NSF降低动态屈服应力的效率不如PCE。更重要的是,动态屈服应力和触变性指数的下降模式随添加NSF和PCE的不同而不同。这与这两种类型的高效减水剂的吸附和分散机理有关。

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