【摘要】 纳米碳酸钙经硅烷偶联剂KH570改性后，再与丙烯酸、羟丁基乙烯基聚醚（VPEG）进行共聚得到改性纳米碳酸钙。FT-IR、TG等测试证明纳米碳酸钙表面成功接枝聚羧酸减水剂，其接枝率约为25%。试验结果表明改性纳米碳酸钙具有良好的分散性，能够促进水泥水化反应，优化水泥基材料内部的微观结构，增强混凝土的力学性能。在改性纳米碳酸钙掺量为0.5%时，与参考样混凝土相比，28 d后掺杂改性纳米碳酸钙的混凝土抗压强度提升4%，抗折强度提升19%。更多还原

【Abstract】 On the base of nano calcium carbonate modified by KH570,the obtained nano calcium carbonate was copolymerized with acrylic acid and hydroxybutyl vinyl ether(VPEG),thus achieving the modified nano calcium carbonate.FT-IR,TG demonstrated that the polycarboxylate superplasticizer was successfully grafted onto the surface of nano calcium carbonate,and the load of the polycarboxylate superplasticizer on nano calcium carbonate surface was approximately 25% by chemical bond.The results showed that the modified nano calcium carbonate with good dispersibility can promote cement hydration and enhance the compactness of cement-based material structure,which can strengthen the mechanical properties of concrete.When the dosage of modified nano calcium carbonate is 0.5%,compared with the sample concrete,the compressive strength and flexural strength of concrete doped with modified nano calcium carbonate increased by 4% and 19%,respectively,after curing for 28 days.更多还原