Experimental Study on Mechanical Properties and Frost Resistance of MU10 Recycled Concrete Load-Bearing Block
QI Yunpeng1, WANG Qiusheng1, QIN Li2,*, SHANG Xiaoyu2
1 The Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing 100124, China 2 School of Civil Engineering and Architecture, Northeast Electric Power University, Jilin 132012, Jilin, China
Abstract: In order to further improve the utilization rate of waste concrete and promote the application of recycled concrete bearing blocks in severe cold areas, based on the analysis of the physical properties of recycled aggregate, the effects of 100% recycled coarse aggregate replacement rate, water-binder ratio, water consumption and fly ash content were considered, and the mix ratio of C30 recycled concrete was designed by orthogonal tests to prepare MU10 recycled concrete load-bearing blocks. By analyzing the mechanical properties of MU10 recycled concrete load-bearing blocks, the optimal mix ratio of MU10 recycled concrete load-bearing blocks was determined, and the frost resistance of MU10 recycled concrete load-bearing blocks was verified by environmental simulation box. The results show that compared with natural aggregate, recycled aggregate has a rougher surface, with some old cement mortar attached. It has the characteristics of low density, high porosity, water absorption and mud content, and the crushing index is about twice that of natural aggregate. The optimal mix ratio of MU10 recycled concrete load-bearing blocks is 1 172 kg/m3 recycled coarse aggregate, 578 kg/m3 natural river sand, 400 kg/m3 cement, 100 kg/m3 fly ash and 150 kg/m3 water. Its compressive strength is 11.4 MPa and flexure strength is 2.1 MPa, which can be used for load-bearing and seismic resistant masonry structures. After 50 freeze-thaw cycles, the quality loss and strength loss of MU10 recycled concrete load-bearing block are 1.2% and 18.1%, respectively. The frost resistance meets the requirements, and it can be used as a new wall material in severe cold areas.
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2024, Vol. 38 
