DataVXAdvances in Cement ResearchPaper
journal article·2020-08

Long-term mechanical properties and micro mechanism of magnesium oxychloride cement concrete

Chenggong Chang, Jinmei Dong, Xueying Xiao, Weixin Zheng, Jing Wen, Ying Li, Qing Huang, Yangyang Man

Advances in Cement Research· Volume 32· Issue 8
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Source abstract

Abstract

According to the C20 Portland cement concrete (PCC) batching standard, magnesium oxychloride cement concrete (MOCC) is made using bischofite from salt lakes and light-burned magnesium oxide as the main raw materials. In this work, the mechanical properties of MOCC (setting time and compressive and flexural strengths) were tested. The rules governing the phase composition and microstructure changes of the hydration products were analysed using X-ray diffraction and scanning electron microscopy. The results showed that MOCC solidifies rapidly, has high early compressive and flexural strengths and exhibits excellent long-term mechanical properties, far superior to those of the same grade of C20 PCC. The main phase at different curing times was found to be 5Mg(OH)2.MgCl2.8H2O (5.1.8). With hydration from 7 to 365 d, the amount of 5.1.8 fluctuated between 30% and 37% and the microscopic crystal morphology of the MOCC changed significantly. Importantly, fibre-like and rod-like crystals were observed to transform into their respective gel phases from 180 to 270 d. This phenomenon explains the fact that the content of 5.1.8 was the lowest but the mechanical strength of MOCC was the highest at 180 and 270 d. It was also confirmed that 5.1.8 gel is one of the main strength phases.
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Research context

OpenAlex topics: Magnesium Oxide Properties and Applications · Concrete and Cement Materials Research · Recycling and utilization of industrial and municipal waste in materials production

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Assistant Researcher, Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xinning, PR China; Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Xining, PR China

Associate Researcher, Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xinning, PR China; Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Xining, PR China (corresponding author: )

Researcher, Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xinning, PR China; Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Xining, PR China

Doctoral student, Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xinning, PR China; Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Xining, PR China; The Graduate University of Academy of Science, Beijing, PR China

Associate Researcher, Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xinning, PR China; Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Xining, PR China

Graduate student, Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xinning, PR China; Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Xining, PR China; The Graduate University of Academy of Science, Beijing, PR China

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