| 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0.2425g的CH和0.2351g的Wn，1g粉煤灰完全反应吸收0.5089g的CH和0.1839g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. |
| 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 |
| DOI：10.3969/j.issn.1007 9629.2017.03.001 |
| 分类号: |
| 基金项目: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) |
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| Chemical Reaction of Fly Ash in Portland Cement Paste |
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FENG Shuxia1, WANG Peiming2
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1.School of Architectural Engineering, Shandong Yingcai University, Jinan 250104, China;2.Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, Tongji University, Shanghai 201804, China
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| Abstract: |
| Cement hydration degree, fly ash reaction degree, portlandite(CH) content and chemically combined 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 1g cement combines 0.2351g Wn and generate 0.2425g CH while 1g fly ash reacts with 0.5089g CH and generates 0.1839g 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. |
| Key words: fly ash Portland cement paste reaction model generation coefficient absorption coefficient |
