Modified polyurethane prepolymer was prepared using segmental synthesis method. Then, pectiniform polycarboxylate were synthesized at normal temperature in the complex initiation system of H2O2, APS, sodium bisulfite, Vc, and rongalit according to free radical polymerization reaction mechanism, using TPEG, AA, PEG as raw materials and TGA as chain transfer agent. Compared with commercial Sika polycarboxylate, their flowability, strength, drying shrinkage, auto-shrinkage were studied. The experimental results show that the synthesized polycarboxylate could be better dispersed. Adding silica fume can enhance the compressive strength of UHPC, while slag may decline its strength. By incorporation of slag and silica fume, the drying shrinkage of UHPC was reduced, but its auto-shrinkage was increased.

中文翻译：

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聚氨酯改性聚羧酸酯的合成及其在超高性能混凝土中的应用

采用链段合成法制备改性聚氨酯预聚物。然后，以TPEG、AA、PEG为原料，TGA为链转移剂，在H2O2、APS、亚硫酸氢钠、Vc、Rongalit的复合引发体系中，根据自由基聚合反应机理，在常温下合成了果胶状聚羧酸酯。与商品西卡聚羧酸酯相比，对其流动性、强度、干燥收缩率、自收缩进行了研究。实验结果表明，合成的聚羧酸盐具有较好的分散性。添加硅粉可以提高UHPC的抗压强度，而炉渣可能会降低其强度。通过掺入矿渣和硅粉，UHPC的干燥收缩率降低，但自收缩率增加。