Abstract
The determination of delayed ettringite formation (DEF) in hardened concrete relying simply on the identification of ettringite by electron microscopy or powder X-ray diffractometry can be imperfect because of the high risk of missing other possible deterioration phenomena. The presence of ettringite can be easily biased as an indication of DEF while the actual cause of deterioration is ASR. This paper identifies the deterioration causes and presents different ettringite formation factors based on the petrological observation results. The experiments conditions including depth of carbonation, mix proportions of concrete, curing temperature and others were considered. The deterioration of the samples seem to be correlated to ASR, except for the precast concrete product which presented DEF. In order to determine the deterioration causes and demonstrate the importance of petrological approach, different observations using the same methods were carried out on a concrete specimen blended with fly ash showing some cracks.
Subject
Mechanics of Materials,General Materials Science,Building and Construction
Reference42 articles.
1. 参考文献
2. [1] Alexandre Jentzer,Cytomegalovirus and Inflammatory Bowel Diseases (IBD) with a Special Focus on the Link with Ulcerative Colitis (UC)Microorganisms,2020Jul20;8(7):1078.doi:10.3390/microorganisms8071078.
3. [2] Fadi H Mourad,Ulcerative Colitis and Cytomegalovirus Infection: From A to Z,J Crohns Colitis,2020 Sep 7; 14(8): 1162-1171. doi: 10.1093/ecco-jcc/jjaa036.
4. [3] 温航卫,肖吉平,肖成平,刘辉,夏欢. 布拉氏酵母菌联合更昔洛韦治疗巨细胞病毒感染相关性溃疡性结肠炎[J]. 实用儿科临床杂志,2012,19:1525-1526.
5. [4] 魏民华,尹凤荣,杨少鹏,雷蕾,郭金波,王冬,张晓岚. 溃疡性结肠炎患者巨细胞病毒感染或再激活危险因素的Meta分析[J]. 中华实验和临床病毒学杂志,2019,05:541-546.
Cited by
3 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献