陶瓷粉再生混凝土冻融破坏可靠性分析

doi:10.11896/cldb.19040278

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Abstract In order to improve the recycling efficiency of waste ceramic powder, aiming at the poor frost resistance of recycled concrete, the effect of ceramic powder on the freeze-thaw resistance of recycled concrete under different substitution rates was studied. Six groups of mixtures with ceramic powder substitution rates of 0%, 10%, 20%, 30%, 40% and 50% were designed. Before the test, based on the principle of nuclear magnetic resonance (NMR), the porosity distribution, porosity and permeability of each group of specimens were calculated, and the relationship between porosity and permeability of recycled concrete with ceramic powder was established by using MATLAB. After each freeze-thaw cycle, the mass loss rate and relative dynamic modulus of each group of specimens were measured. Based on Palmgren theory, the reliability calculation model of freeze-thaw damage is established, and the residual life of each group of specimens is predicted. The results show that the dynamic modulus of elasticity decreases, the mass loss rate increases first and then decreases. When the replacement rate of ceramic powder is 20%, the porosity and permeability of recycled concrete with ceramic powder are the smallest, and the freeze-thaw cycle resistance is the strongest. In addition, the reliability calculation model of freeze-thaw damage based on Palmgren model has high reliability, which can directly reflect the relationship between the reliability of recycled ceramic powder concrete and freeze-thaw cycle, and has good applicability in practical application.

Key words： recycled concrete freeze-thaw damage NMR theory Palmgren model reliability

Published: 26 April 2020

CLC number:

TU528

Fund:This work was financially supported by the National Natural Science Foundation of China (51868044, 51468039), Special Fund of International Research Base on Seismic Mitigation and Isolation of Gansu Province (GII2019-TD06).

Corresponding Authors: Kuan Peng received his B.E. degree in civil enginee-ring from Tianjin Chengjian University in 2016. He is currently pursuing his M. S. at the College of Civil Engineering,Lanzhou University of Technology under the supervision of Prof. Hongxia Qiao. His research focuses on the durability assessment and life prediction of recycled concrete.

About author:: Hongxia Qiaoreceived her B.E. degree in construction and civil engineering from Taiyuan University of Technology in 2000 and received her Ph.D. degree in structural engineering from the College of Civil Engineering,Lanzhou University of Technology,in 2007. She has been doing postdoctoral research in Qinghai Salt Lake Research Institute,Chinese Academy of Scie-nces for 3 years. Now she is currently a full professor in Lanzhou University of Technology,a member of the AEIC expert group,an expert on the core group of the Ministry of Science and Technology,a degree thesis review expert of the Ministry of Education,a peer review expert of the National Natural Science Foundation of China,and a cooperative mentor of“Academician Mentor Program”organized by the Central Committee of the Jiu San Society. Her research interests are durability assessment and life prediction of ordinary concrete and magnesium oxychloride cement concrete.

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	QIAO Hongxia
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Cite this article:

QIAO Hongxia,PENG Kuan,CHEN Kefan, et al. Reliability Analysis of Freeze-thaw Damage of Ceramic Powder Recycled Concrete[J]. Materials Reports, 2020, 34(10): 10035-10040.

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http://www.mater-rep.com/EN/10.11896/cldb.19040278 OR http://www.mater-rep.com/EN/Y2020/V34/I10/10035

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