粉煤灰改善石灰石硅酸盐水泥耐硫酸盐侵蚀的机理  

Mechanism of Improvement in Sulfate Resistant of Portland-Limestone Cement by Fly Ash

作　　者：张永娟[1] 张雄[1] 

机构地区：[1]同济大学砼材料研究国家重点实验室,上海200092

出　　处：《粉煤灰综合利用》2002年第1期19-21,共3页Fly Ash Comprehensive Utilization

摘　　要：探讨了石灰石硅酸盐水泥在低温和一定浓度MgSO4 溶液中的侵蚀过程。采用粉煤灰部分替代石灰石微粉或水泥来阻止侵蚀反应或延缓反应速度 ,并提高石灰石硅酸盐水泥的强度。对净浆试样定期目测观察 ,并用XRD物相鉴定方法对某些样品进行物相鉴定 ,证实侵蚀物质为水化碳硫硅酸钙 ,同时证实Ca(OH ) 2 参与了侵蚀反应 。The corrosion of Portland limestone cement pastes in the certain MgSO 4 soultion at low temperature was studied. The corrosion can be resisted or delayed by partially replacing limestone powder or cement with fly ash. The strength of Portland limestone cement can also be enhanced. The pastes are visually inspcted periodically. Some samples of the pastes are examined by X ray diffraction. In this way we can confirm that corrosion substance is Hydrated Calcium Carbon Sulfate Silicate. At the same time it is also verified that Ca(OH) 2 tekes part in the corrosion reaction. The mechanism is further defined that fly ash improves salfate resistant of Portland lime stone cement.

关 键 词：粉煤灰 石灰石 硅酸盐水泥 MgSO4 侵蚀 

分 类 号：TQ172.71[化学工程—水泥工业]