| 摘要: |
| 测试了掺氨基三亚甲基膦酸（ATMP）水泥净浆的凝结时间及抗压强度.利用水化热测试、X射线衍射分析、热重分析、扫描电镜分析、Zeta电位测试等手段研究了ATMP对水泥水化的影响，探讨了ATMP对水泥净浆的缓凝机理.结果表明：随着ATMP掺量（以占水泥质量分数计）的增加，水泥净浆凝结时间逐渐延长；掺ATMP水泥净浆3d抗压强度仅在ATMP掺量大于等于008%时低于空白样，而28d抗压强度在ATMP掺量010%范围内均高于空白样；在水化初期，ATMP促进了水泥中C3A矿物的水化.ATMP与水泥净浆中的Ca2+结合形成微溶性的Ca35（C3H7O10NP3）螯合物并包裹在未水化的水泥颗粒表面，抑制了C3S矿物的水化和Ca（OH）2的形成，导致水泥水化放热量和水化放热速率随ATMP的掺入而明显降低. |
| 关键词: 水泥 水化 超缓凝剂 有机膦酸 缓凝机理 |
| DOI：103969/j.issn1007 9629201603001 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目（51372185） |
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| Effect of Amino Trimethylene Phosphonic Acid on Hydration of Portland Cement |
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LI Beixing1, L Xingdong1, WEI Yunquan2, ZHANG Jianfeng2
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1.State Key Laboratory of Silicate Materials for Architecture, Wuhan University of Technology, Wuhan 430070, China;2.Hubei Hengli Construction Material Technology Co.Ltd., Jingzhou 434000, China
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| Abstract: |
| The setting times and compressive strength of Portland cement pastes containing amino trimethy lene phosphonic acid(ATMP) were tested. By means of hydration heat measurement, X ray diffraction(XRD) analysis, differential thermal gravity(DTG) analysis, scanning electron microscope(SEM) analysis and Zeta potential test, the effects of ATMP on hydration of cement were investigated, and the retarding mechanism of ATMP on cement pastes was discussed. The results show that with the increase of use level (the mass percentage of cement) of ATMP, the setting time of cement pastes is gradually extended. Compared with the blank sample, the 3d compressive strength of cement pastes is reduced only when the use level of ATMP is greater than or equal to 008%, and the 28d compressive strength is increased when the use level of ATMP is ranging in 010%. In the initial stage of cement hydration, ATMP accelerates the hydration of C3A minerals. ATMP can chelate Ca2+ in the cement pastes to form sparingly soluble Ca35(C3H7O10NP3) chelation, and the chelation wraps on the surfaces of the unhydrated cement particles, which retards further hydration of C3S minerals and formation of Ca(OH)2, resulting in significant decreases in the hydration heat and hydration heat evolution rate of cement with the addition of ATMP. |
| Key words: Portland cement hydration super retarder organic phosphonic acid retarding mechanism |
