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以烯丙基聚氧乙烯醚2000(APEG2000)、马来酸酐(MAH)和2-丙烯酰胺-2-甲基丙磺酸(AMPS)为原料,以过硫酸铵-亚硫酸钠为引发体系,合成出醚类聚羧酸系水泥减水剂。经正交试验选出最佳合成工艺条件:APEG与MAH摩尔比为1∶2,APEG与AMPS摩尔比为1∶0.4,过硫酸铵-亚硫酸钠引发体系质量占聚合单体总质量的1.5%,聚合时间6h,聚合温度45℃。该条件下单体转化率为93.68%,水泥净浆初始流动度为242mm,坍落度为199mm。采用傅立叶变换红外光谱仪(FTIR)对聚合物分子结构进行了表征;通过扫描电镜(SEM)和X射线衍射(XRD)对加入该减水剂的硬化水泥石微观结构进行了分析,结果表明,减水剂的加入减慢了水泥凝胶体向结晶体转变的过程,同时加快了水泥的水化程度。
Using APH2000 (APEG2000), maleic anhydride (MAH) and 2-acrylamide-2-methylpropanesulfonic acid (AMPS) as raw materials and ammonium persulfate-sodium sulfite as initiator, Ether polycarboxylate cement superplasticizer. The optimal synthesis conditions were selected by orthogonal test: the molar ratio of APEG to MAH was 1: 2, the molar ratio of APEG to AMPS was 1: 0.4, the mass of ammonium persulfate-sulfite initiator system accounted for 1.5% of the total mass of the monomers, Polymerization time 6h, polymerization temperature 45 ℃. Under this condition, the monomer conversion was 93.68%, the initial fluidity of cement paste was 242mm and the slump was 199mm. The molecular structure of the polymer was characterized by Fourier transform infrared spectroscopy (FTIR). The microstructure of hardened cement was analyzed by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results showed that the reduction of The addition of liquid agent slowed down the process of cement gel to crystal transition, and accelerated the hydration of cement.