赤泥合成砂的碱活性及界面元素特征

摘要/Abstract

摘要： 以赤泥为主体,加入少量粉煤灰和膨润土烧制成赤泥合成砂,通过慢速碱-集料反应对赤泥合成砂碱活性进行检测和研究,对碱-集料反应试件中赤泥合成砂和水泥界面微区进行扫描电子显微镜能谱(SEM-EDS)分析,并与标准砂和天然河砂进行对比。结果表明:赤泥合成砂碱-集料反应试件180 d膨胀率为0.035%,略高于标准砂和天然河砂试件的膨胀率,且膨胀率小于0.1%,符合国家建设用砂标准;与标准砂和天然河砂界面相比,碱-集料反应28 d合成砂界面中Fe元素含量显著,界面生成石榴石。该研究结果对解决赤泥堆存问题以及天然砂紧缺现状可提供参考。

关键词: 赤泥, 合成砂, 碱-集料反应, 界面, 元素特征, 建设用砂

Abstract: Red mud synthetic sand was manufactured by firing and using red mud as the main materials with a small amount of fly ash and bentonite. Alkali activity of red mud synthetic sand was studied by slow alkali-aggregate method. The microzone of interface between red mud synthetic sand and cement was analyzed by SEM-EDS from alkali-aggregate reaction specimen, compared with standard sand and natural fluvial sand specimens. The results show that the expansion rate of specimen is 0.035% in red mud synthetic sand alkali-aggregate reaction on 180 d, which is slightly higher than the expansion rate of specimens in standard sand and natural fluvial sand alkali-aggregate reaction. The expansion rate is less than 0.1% in red mud synthetic sand alkali-aggregate reaction specimen, and meets the requirement as national construction sand. Compared with standard sand and natural fluvial sand in alkali-aggregate reaction specimens, the content of Fe element is highest in the red mud synthetic sand interface on 28 d, and the garnet is generated in the synthetic sand interface. This study can provide a reference for solving accumulation of red mud and shortage of natural sand.

Key words: red mud, synthetic sand, alkali-aggregate reaction, interface, element characteristic, construction sand

中图分类号:

TU521.1

白荣, 罗维志, 乐红志, 朱俊阁, 李子超, 朱建平. 赤泥合成砂的碱活性及界面元素特征[J]. 硅酸盐通报, 2022, 41(12): 4369-4377.

BAI Rong, LUO Weizhi, YUE Hongzhi, ZHU Junge, LI Zichao, ZHU Jianping. Alkali Activity and Interfacial Element Characteristics of Red Mud Synthetic Sand[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(12): 4369-4377.

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