INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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Orthogonal Experiment Analysis on the Multiple Factors Influence of the Interfacial Bonding Performance of the Composite Concrete |
WANG Jianmin1,2, XIAO Ziqiang1, FAN Yitao1, WANG Nengjun1, WANG Wanzhen1, LIU Junzhe1,3
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1 School of Civil and Environmental Engineering, Ningbo University, Ningbo 315211, Zhejiang, China 2 Key Laboratory of Impact and Safety Engineering, Ministry of Education, Ningbo University, Ningbo 315211, Zhejiang, China 3 School of Architecture Engineering, Qingdao Agricultural University, Qingdao 266109, Shandong, China |
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Abstract The composite concrete is made by casting different kinds of concrete on prefabricated components to form the integrated structure member. It has both advantages, convenient construction, short construction period of prefabricated structure and good entirety, seismic perfor-mance of cast-in-situ structure. In addition, the composite concrete superimposed with the normal concrete on the lightweight aggregate concrete can bring into full play the performance advantages of the two kinds of concrete materials. In this work, the orthogonal experiment on the bonding shear performance of the casting interface was designed to study the influence significance considering factors of the casting interval time, the concrete strength matching, the preparing method of the casting interface, the mixing of the steel fiber and the applying of the normal binding force. There were 40 groups of the double-sides-vertically-shearing superimposed sandwich composite concrete blocks made considering the variation of the aforementioned factors. The results indicate that the applying of the normal bin-ding force has the most significant influence on the bonding shear performance among considered factors, and the shearing strength is obviously enhanced with the increase of the normal binding force. The influence of the concrete strength matching and the preparing method of the casting interface on the bonding shear performance are in approximately same level. In the considered variation range, the increase of the concrete strength can effectively improve the shearing performance of the casting interface. Comparatively, the preparation with the interfacial retarder brushing the casting interface has more advantage than other methods of the artificial chiseling, the fly ash mortar brushing and the natural casting interface state. There is no obvious influence on the shearing performance when mixing the steel fiber into the concrete. For different preparing methods of the casting interface, the bonding shear strength clearly decreases in same varying characteristic as the casting interval time is prolonged. Comparing the preparing methods of the fly ash mortar brushing, artificial chiseling and the interfacial retarder brushing, the remaining boding shear strength is about 43.4%, 48.1% and 46.2% that of the respectively original as the casting interval time is prolonged from 10 hours to 28 days. For different casting interval time cases, the bonding shear performance of the casting interface brushed with the interfacial retarder is better than those of the casting interface by artificial chiseling and with the natural casting state.
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Published: 25 January 2022
Online: 2022-01-26
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Fund:National Natural Science Foundation of China (51878360,52178223), Ningbo Natural Science Foundation(202003N4136), Key Laboratory Foundation of Impact and Safety Engineering, Ministry of Education, Ningbo University (CJ202010). |
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