Effects of temperature and age on physico-mechanical properties of cemented gravel sand backfills

doi:10.1007/s11771-020-4524-6

	Effects of temperature and age on physico-mechanical properties of cemented gravel sand backfills
	Jiang, Fei-fei 1,5; Zhou, Hui 1,5; Sheng, Jia 3,4; Kou, Yong-yuan 2; Li, Xiang-dong 4
刊名	JOURNAL OF CENTRAL SOUTH UNIVERSITY
	2020-10-01
卷号	27 期号:10 页码:2999-3012
关键词	cemented backfill gravel sand temperature physico-mechanical properties deformation characteristics
ISSN号	2095-2899
DOI	10.1007/s11771-020-4524-6
英文摘要	Cemented backfill used in deep mines would inevitably be exposed to the ambient temperature of 20-60 degrees C in the next few decades. In this paper, two types of cemented gravel sand backfills, cemented rod-mill sand backfill (CRB) and cemented gobi sand backfill (CGB), were prepared and cured at various temperatures (20, 40, 60 degrees C) and ages (3, 7, 28 d), and the effects of temperature and age on the physico-mechanical properties of CRB and CGB were investigated based on laboratory tests. Results show that: 1) the effects of temperature and age on the physico-mechanical properties of backfills mainly depend on the amount of hydration products and the refinement of cementation structures. The temperature has a more significant effect on thermal expansibility and ultrasonic performance at early ages. 2) The facilitating effect of temperature and age on the compressive strength of CGB is higher than that on CRB. With the increase of temperature, the compressive failure modes changed from X-conjugate shear failure to tensile failure, and the integrity of specimens was significantly improved. 3) Similarly, the shear performance of CGB is generally better than that of CRB. The temperature has a weaker effect on shear strength than age, but the shear deformation and shear plane morphology are closely related to temperature.
WOS研究方向	Metallurgy & Metallurgical Engineering
语种	英语
出版者	JOURNAL OF CENTRAL SOUTH UNIV
WOS记录号	WOS:000590273400014
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/25116]
专题	中科院武汉岩土力学所
通讯作者	Zhou, Hui
作者单位	1.Chinese Acad Sci, State Key Lab Geomech & Geotech Engn, Inst Rock & Soil Mech, Wuhan 430071, Peoples R China 2.Jinchuan Grp Co Ltd, Jinchang 737104, Peoples R China 3.Hunan Univ Sci & Technol, Sch Resource & Environm & Safety Engn, Xiangtan 411201, Peoples R China 4.Changsha Inst Min Res Co Ltd, Natl Engn Res Ctr Met Min, Changsha 410012, Peoples R China 5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Jiang, Fei-fei,Zhou, Hui,Sheng, Jia,et al. Effects of temperature and age on physico-mechanical properties of cemented gravel sand backfills[J]. JOURNAL OF CENTRAL SOUTH UNIVERSITY,2020,27(10):2999-3012.
APA	Jiang, Fei-fei,Zhou, Hui,Sheng, Jia,Kou, Yong-yuan,&Li, Xiang-dong.(2020).Effects of temperature and age on physico-mechanical properties of cemented gravel sand backfills.JOURNAL OF CENTRAL SOUTH UNIVERSITY,27(10),2999-3012.
MLA	Jiang, Fei-fei,et al."Effects of temperature and age on physico-mechanical properties of cemented gravel sand backfills".JOURNAL OF CENTRAL SOUTH UNIVERSITY 27.10(2020):2999-3012.