粉煤灰在硅酸盐水泥浆体中的化学反应  

Chemical Reaction of Fly Ash in Portland Cement Paste

作　　者：丰曙霞[1] 王培铭[2] 

机构地区：[1]山东英才学院建筑工程学院,山东济南250104 [2]同济大学先进土木工程材料教育部重点实验室,上海201804

出　　处：《建筑材料学报》2017年第3期321-325,共5页Journal of Building Materials

基　　金：山东省高等学校科技计划项目(J17KA022);山东省住房城乡建设科学技术计划项目(RK035)

摘　　要：定量测试1~360d纯硅酸盐水泥及掺粉煤灰水泥浆体中胶凝组分的反应程度、生成的氢氧化钙(CH)量及化学结合水(Wn)量;确定单位质量水泥及粉煤灰完全反应生成(或吸收)的CH或Wn量,并以此验证粉煤灰化学反应模型的精确性.结果表明:1g水泥完全水化生成0.242 5g的CH和0.235 1g的Wn,1g粉煤灰完全反应吸收0.508 9g的CH和0.183 9g的Wn,试验结果与现有的粉煤灰化学反应模型计算值差别较大;经修正,获得计算值与试验值较吻合的粉煤灰化学反应模型,该模型更能真实反映粉煤灰在水泥浆体中的化学反应.Cement hydration degree, fly ash reaction degree, portlandite（CH） content and chemically com- bined water（Wn） content in both pure Portland cement paste and fly ash blended Portland cement paste aged from 1 to 360 days were determined quantitatively. Then, the amounts of CH and Wn generated（or absorbed） by complete hydration of unit mass cement and fly ash were investigated respectively. Finally, the accuracy of chemical reaction model of fly ash in cement paste was discussed. The results show that 1 g cement combines 0. 235 1 g Wn and generate 0. 242 5 g CH while 1 g fly ash reacts with 0. 508 9 g CH and generates 0. 183 9 g Wn. The theoretical data calculated by existing reaction model and experimental data show significant difference. After reaction model amendment, the calculated data are consistent with the experimental data well, indicating that the amended reaction model truthfully reveals chemical reaction of fly ash in cement paste.

关 键 词：粉煤灰 硅酸盐水泥 浆体 反应模型 生成系数 吸收系数 

分 类 号：TQ172.1[化学工程—水泥工业]