{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,23]],"date-time":"2026-06-23T13:30:42Z","timestamp":1782221442019,"version":"3.54.5"},"reference-count":36,"publisher":"MDPI AG","issue":"5","license":[{"start":{"date-parts":[[2023,2,22]],"date-time":"2023-02-22T00:00:00Z","timestamp":1677024000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Applied Basic Research in Qinghai Province","award":["2021-ZJ-737"],"award-info":[{"award-number":["2021-ZJ-737"]}]},{"name":"Applied Basic Research in Qinghai Province","award":["2019423"],"award-info":[{"award-number":["2019423"]}]},{"name":"Top Talents program of \u201cKunlun Talents High-end Innovation and Entrepreneurship Talents\u201d in Qinghai Province","award":["2021-ZJ-737"],"award-info":[{"award-number":["2021-ZJ-737"]}]},{"name":"Top Talents program of \u201cKunlun Talents High-end Innovation and Entrepreneurship Talents\u201d in Qinghai Province","award":["2019423"],"award-info":[{"award-number":["2019423"]}]},{"name":"Western Young Scholars program at the Chinese Academy of Sciences (2021)","award":["2021-ZJ-737"],"award-info":[{"award-number":["2021-ZJ-737"]}]},{"name":"Western Young Scholars program at the Chinese Academy of Sciences (2021)","award":["2019423"],"award-info":[{"award-number":["2019423"]}]},{"name":"Youth Innovation Promotion Association at the Chinese Academy of Sciences","award":["2021-ZJ-737"],"award-info":[{"award-number":["2021-ZJ-737"]}]},{"name":"Youth Innovation Promotion Association at the Chinese Academy of Sciences","award":["2019423"],"award-info":[{"award-number":["2019423"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Materials"],"abstract":"<jats:p>To reveal the deterioration process of magnesium oxychloride cement (MOC) in an outdoor, alternating dry\u2013wet service environment, the evolution of the macro- and micro-structures of the surface layer and inner core of MOC samples as well as their mechanical properties and increasing dry\u2013wet cycle numbers were investigated by using a scanning electron microscope (SEM), an X-ray diffractometer (XRD), a simultaneous thermal analyser (TG-DSC), a Fourier transform infrared spectrometer (FT-IR), and an microelectromechanical electrohydraulic servo pressure testing machine. The results show that as the number of dry\u2013wet cycles increases, the water molecules gradually invade the interior of the samples, causing the hydrolysis of P 5 (5Mg(OH)2\u00b7MgCl2\u00b78H2O) and hydration reactions of unreacted active MgO. After three dry\u2013wet cycles, there are obvious cracks on the surface of the MOC samples, and they suffer from warped deformation. The microscopic morphology of the MOC samples changes from a gel state and a short, rod-like shape to a flake shape, which is a relatively loose structure. Meanwhile, the main phase composition of the samples becomes Mg(OH)2, and the Mg(OH)2 contents of the surface layer and inner core of the MOC samples are 54% and 56%, respectively, while the P 5 amounts are 12% and 15%, respectively. The compressive strength of the samples decreases from 93.2 MPa to 8.1 MPa and reduces by 91.3%, and their flexural strength declines from 16.4 MPa to 1.2 MPa. However, their deterioration process is delayed compared with the samples that were dipped in water continuously for 21 days whose compressive strength is 6.5 MPa. This is primarily ascribed to the fact that during the natural drying process, the water in the immersed samples evaporates, the decomposition of P 5 and the hydration reaction of unreacted active MgO both slow down, and the dried Mg(OH)2 may provide the partial mechanical properties, to some extent.<\/jats:p>","DOI":"10.3390\/ma16051817","type":"journal-article","created":{"date-parts":[[2023,2,23]],"date-time":"2023-02-23T02:01:25Z","timestamp":1677117685000},"page":"1817","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Study on Deterioration Process of Magnesium Oxychloride Cement under the Environment of Dry\u2013Wet Cycles"],"prefix":"10.3390","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2936-7255","authenticated-orcid":false,"given":"Chenggong","family":"Chang","sequence":"first","affiliation":[{"name":"State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China"},{"name":"Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lake, Chinese Academy of Sciences, Xining 810008, China"},{"name":"Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Xining 810008, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lingyun","family":"An","sequence":"additional","affiliation":[{"name":"Qinghai Provincial Key Laboratory of Nanomaterials and Technology, College of Physics and Electronic Information Engineering, Qinghai Minzu University, Xining 810007, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jinmei","family":"Dong","sequence":"additional","affiliation":[{"name":"Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lake, Chinese Academy of Sciences, Xining 810008, China"},{"name":"Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Xining 810008, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Weixin","family":"Zheng","sequence":"additional","affiliation":[{"name":"Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lake, Chinese Academy of Sciences, Xining 810008, China"},{"name":"Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Xining 810008, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jing","family":"Wen","sequence":"additional","affiliation":[{"name":"Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lake, Chinese Academy of Sciences, Xining 810008, China"},{"name":"Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Xining 810008, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8345-5929","authenticated-orcid":false,"given":"Fengyun","family":"Yan","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xueying","family":"Xiao","sequence":"additional","affiliation":[{"name":"Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lake, Chinese Academy of Sciences, Xining 810008, China"},{"name":"Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Xining 810008, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2023,2,22]]},"reference":[{"key":"ref_1","first-page":"502","article-title":"Development path of energy science and technology under \u201cdual carbon\u201d goals: Perspective of multi-energy system integration","volume":"37","author":"Cai","year":"2022","journal-title":"Bull. 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