不同水灰比下无水硫铝酸钙的水化反应
发布时间：2018-10-08 06:17
【摘要】：为澄清无水硫铝酸钙的水化反应机理,利用化学试剂Ca CO3、Al2O3、Ca SO4合成纯度达90%以上的无水硫铝酸钙(C4A3嫜)单矿物,研究其在水灰比为0.3、05、0.7条件下的水化反应,包括不同水化时间的水化产物及变化规律,用X射线衍射仪、综合热分析仪和扫描电子显微镜对水化产物进行分析.结果表明:水化产物为含不同摩尔结晶水的2种单硫型水化硫铝酸钙C4A嫜H12(AFm-12)和C4A嫜H1 4(AFm-14)以及无定形状态的铝凝胶(AH3),整个水化过程未生成钙矾石(AFt);随着水化时间的延长,C4A嫜H12(AFm-12)会逐渐转化为C4A嫜H1 4(AFm-14);水化反应主要集中发生在3~12 h,后期C4A嫜H1 4晶体不断长大.
[Abstract]:In order to clarify the hydration mechanism of anhydrous calcium sulphoaluminate, anhydrous calcium sulphoaluminate (C4A3) single mineral with purity of more than 90% was synthesized by using chemical reagent Ca CO3,Al2O3,Ca SO4. The hydration products of different hydration times were analyzed by X-ray diffractometer, comprehensive thermal analyzer and scanning electron microscope. The results show that the hydration products are C4A H12 (AFm-12) and C4A H14 (AFm-14) and amorphous aluminum gel (AH3) containing different molar crystalline water. No ettringite (AFt); is formed in the whole hydration process with the hydration time. C4A-H12 (AFm-12) was transformed into C4A-H14 (AFm-14), and the hydration reaction mainly occurred at 3h, and the crystal of C4A-H14 grew up at the later stage.
【作者单位】： 大连理工大学土木工程学院;
【基金】：国家自然科学基金资助项目(51472041)
【分类号】：TQ172.1
[Abstract]:In order to clarify the hydration mechanism of anhydrous calcium sulphoaluminate, anhydrous calcium sulphoaluminate (C4A3) single mineral with purity of more than 90% was synthesized by using chemical reagent Ca CO3,Al2O3,Ca SO4. The hydration products of different hydration times were analyzed by X-ray diffractometer, comprehensive thermal analyzer and scanning electron microscope. The results show that the hydration products are C4A H12 (AFm-12) and C4A H14 (AFm-14) and amorphous aluminum gel (AH3) containing different molar crystalline water. No ettringite (AFt); is formed in the whole hydration process with the hydration time. C4A-H12 (AFm-12) was transformed into C4A-H14 (AFm-14), and the hydration reaction mainly occurred at 3h, and the crystal of C4A-H14 grew up at the later stage.
【作者单位】： 大连理工大学土木工程学院;
【基金】：国家自然科学基金资助项目(51472041)
【分类号】：TQ172.1
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