干湿循环下含初始损伤泡沫混凝土劣化机理研究

doi:10.11896/cldb.20030196

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Abstract Lightweight cellular concrete (LCC) is a new class of geotechnical engineering materials, which can be produced by physical method mixing cement, water, foaming agent and some additive materials (fly ash, glass fiber, etc.) in a certain proportion. It has been widely utilized in the highway embankment filling, but the durability problem always troubles engineers. In fact, the damage caused by different factors will occur in the whole process of the production of LCC. Therefore, this paper mainly analyzed the initial damage caused by construction technology and external environmental factors. Meanwhile, the deterioration mechanism of physical and mechanical characteristics of samples with initial damage under the wetting-drying (w-d)cycles was studied. In the microscopic test, the damage variable was defined by unconfined compressive strength, and the porosity area ratio was used as a characteristic parameter to describe the damage evolution. MATLAB was used to fit the variation law of strength, versus porosity area ratio and the number of w-d cycles, and the strength deterioration relations of samples with different initial damage forms were obtained. Eventually, the damage evolution equations related to porosity area ratio and the number of w-d cycles were established and verified. The results make clear that, the porosity area ratio of samples with initial damage caused by different construction techniques all increases with the w-d cycles, and the strength decreases nonlinearly with the increase of porosity area ratio. As the number of w-d cycles increases, the different moisture content of the sample causes differences in internal thermal expansion. The temperature stress continues to develop and micro-cracks continue to form, so the porosity area ratio increases, and the strength gradually deteriorates and decreases.

Key words： lightweight cellular concrete (LCC) strength degradation microscopic test initial damage wetting-drying cycle

Published: 03 August 2021

CLC number:

TU528.2

Fund:National Natural Science Foundation Youth Fund of China (51609071), Basic Scientific Research Opera-ting Expenses of Central Universities (B200202087) and China Scholarship Council (201806715014).

About author:: Xin Liu received his Ph.D. degree in geotechnical engineering from Hohai University in 2011. He is currently an associate professor in the Institute of Tunnel and Underground Engineering. His research interests are multi-scale structural and mechanical properties of geotechnical material, special soil improvement and damage mechanism, safety and environmental impact of underground engineering.

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	LIU Xin
	NI Chengwei
	SUN Dongning
	SHAO Zhiwei
	SHI Yunqiang

Cite this article:

LIU Xin,NI Chengwei,SUN Dongning, et al. Study on Deterioration Mechanism of Lightweight Cellular Concrete with Initial Damage Under Wetting-drying Cycles[J]. Materials Reports, 2021, 35(14): 14065-14071.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.20030196 OR http://www.mater-rep.com/EN/Y2021/V35/I14/14065

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