- 馮乃謙1,石云興2,牛全林3
2009年第2期
摘要
引用本文
摘 要:以天然沸石超細粉吸附高效減水劑,制得沸石減水保塑劑。沸石減水保塑劑可用于普通混凝土、高性能混凝土及超高性能混凝土,使混凝土流動性增大,并能控制流動性的經時變化;這主要是由于在混凝土中它能緩慢被釋出,從而維持水泥粒子對減水劑的吸附量,使水泥粒子表面具有較穩值的Zeta電位,使水泥漿常處于分散狀態。在超高性能混凝土中,它還能降低新拌混凝土的粘度,便于泵送施工。沸石減水保塑劑摻入混凝土中還能改善硬化混凝土的結構,提高混凝土的強度。
Abstract: Absorption and desorption of superplasticizer by natural zeolite powder were investigated,and a zeolite plastic-keeping water reducer with natural zeolite powder as a carrier was produced. The addition of zeolite superplasticizer in concrete, the HPC and UHPC can increase their fluidity and slump, while the loss of fluidity and slump are effectively controlled. The causes are mainly that, the superplasticizer can be released gradually in the concrete from absorpted surface of zeolite, that will maintain the concentration of superplaticizer at the surface of cement particles, so that can maintain the surface zeta potential of cement particles and can keep the dispersing state of cement paste. It can also decrease the viscosity of fresh concrete for easy concreting of UHPC by pumping.The zeolite plasticizer can also improve the structure and increase the strength of concrete.