A comparable study on the deterioration of limestone powder blended cement under sodium sulfate and magnesium sulfate attack at a low temperature

doi:10.1016/j.conbuildmat.2020.118279

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	A comparable study on the deterioration of limestone powder blended cement under sodium sulfate and magnesium sulfate attack at a low temperature
	Wu, Meng 1,4; Zhang, Yunsheng 4,5; Ji, Yongsheng 1; She, Wei 4; Yang, Lin 3; Liu, Guojian 2
	2020-05-20
关键词	Corrosion Deterioration Electron probe microanalysis Fourier transform infrared spectroscopy Gypsum Lime Limestone Magnesium powder Portland cement Silicate minerals Sodium sulfate Sulfur compounds Temperature X ray powder diffractionCorrosion products Deterioration mechanism Limestone powder Magnesium sulfate solution Sulfate attack Sulfate solutions Thaumasite Thaumasite formation
卷号	243
DOI	10.1016/j.conbuildmat.2020.118279
英文摘要	The deterioration mechanisms and corrosion products of Portland cement blended with limestone powder (PLC) exposed to external sulfate solutions at 5 ± 1 °C were investigated in the present study. The damage degree of paste specimens was evaluated by the evolution of appearance, strength and volume. Furthermore, to identify and quantitatively analyse the compositions of corrosion products during sulfate attack, Fourier transform infrared spectroscopy, quantitative X-ray powder diffraction and electron microprobe analysis were applied in this study. The results showed that the PLC were seriously damaged after immersion for 360 days due to the expansion of volume and the loss of strength. Moreover, the type of sulfate solution had great influence on the compositions of corrosion products from PLC immersed in sulfate solutions at low temperatures. The corrosion products of PLC immersed in sodium sulfate solution were mainly composed of thaumasite and ettringite. However, in scenario of magnesium sulfate solution, the corrosion products were basically gypsum coupled with thaumasite. The analysis results indicated that the low pH value of pore solution and decalcification effect due to magnesium sulfate attack was probably beneficial for thaumasite formation by transformation of ettringite (woodfordite route), while the sodium sulfate seemed to favour the formation of thaumasite via direct route. © 2020 Elsevier Ltd
会议录	Construction and Building Materials
会议录出版者	Elsevier Ltd
语种	英语
ISSN号	09500618
WOS研究方向	Construction & Building Technology ; Engineering ; Materials Science
WOS记录号	WOS:000527409700076
内容类型	会议论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/132681]
专题	兰州理工大学
作者单位	1.School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou; 221116, China; 2.School of Civil Engineering, Suzhou University of Science and Technology, Suzhou; 215011, China 3.School of Water Conservancy Engineering, Zhengzhou University, Zhengzhou; 450001, China; 4.Jiangsu Key Laboratory for Construction Materials, Southeast University, Nanjing; 211189, China; 5.Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology, Lanzhou; 730050, China;
推荐引用方式 GB/T 7714	Wu, Meng,Zhang, Yunsheng,Ji, Yongsheng,et al. A comparable study on the deterioration of limestone powder blended cement under sodium sulfate and magnesium sulfate attack at a low temperature[C]. 见:.