作　　者： ; ;

机构地区： 深圳大学土木工程学院深圳市土木工程耐久性重点实验室

出　　处： 《材料研究学报》 2006年第2期141-147,共7页

摘　　要： 以 MgO 含量较低的镁砂和粉煤灰为主要原料,制备了磷硅酸盐胶凝水泥(MPSC),研究力学性能．结果表明,磷硅酸盐水泥凝结快,早期强度高．掺入30%—50%的粉煤灰可明显地提高 MPSC 的早期和长期抗压强度,其中以粉煤灰掺量为 40%效果最好．使用 MgO 含量较高而且颗粒较细的镁砂,制备出的水泥具有较高的强度．水泥石的水化产物以无定形为主,伴以少量的六水水化磷酸镁钾品体．硬化水泥石中有许多未水化的镁砂,可作微集料．粉煤灰填充了反应物之间的空隙,使基体的密实度提高；粉煤灰参与水化反应提高了材料的胶凝性能． The phosphate bonded cement was prepared by incorporating magnesia with different content and fineness with fly ash and the mechanical properties of cement mortars were investigated. It was shown that the cement set rapidly and had high early strength. The mechanical properties of cement were improved when fly ash content （mass fraction） was form 30%-50%, and the cement had the best strength when the fly ash content was 40%. The mortars with higher magnesia content and finer particle size resulted in higher compressive strength.The hydration products formed in hardened paste were crystalline of hexahydrate phosphate and amorphous species. There was also much unreacted magnesia in the hardened cement paste, which could be as the fine aggregate. The particles of fly ash filled in the voids of cement matrix and made it denser and fly ash might participate the hydration and formed rigid interlinks with hydrates, which improved the bonding of the cement.

关 键 词： 无机非金属材料 磷酸镁水泥 力学性能 水化机理

领　　域： [一般工业技术]