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| Effects on frost resistance of concrete mixed with ceramic polishing powder and mineral powder |
| YAO Zhanquan*, LIU Zimei, WU Hanhan, WANG Zongxi |
| College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010018, China |
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Abstract In order to study the influence of the compound admixture of ceramic polishing powder and mineral powder on the performance of concrete, the equivalent amount of cement was substituted for 25%, 30% and 35%, in which the mineral powder content was 20%, and the ceramic polishing powder content is 5%, 10% and 15% respectively. The research of concrete was mainly divided into macroscopic tests and microscopic tests.Compression tests and freezing and thawing tests were set up in macroscopic tests. Nuclear magnetic resonance(NMR)and scanning electron microscope(SEM)images analysis were set in microscopic tests. The results shows that the compressive strength of ceramic polishing powder-mineral powder concrete is higher than that of mineral powder concrete when the curing age reaches 28 days. The compressive strength of concrete with 20% mineral powder and 10% ceramic polishing powder is the highest. The NMR shows that the addition of ceramic powder and mineral powder reduces the pore size and porosity of concrete, meanwhile the internal large pores evolve into small pores. After the freeze-thaw cycles, the number of harmful holes reduces and the pore structure is refined, thus ceramic polishing powder improves the pore structure and freeze-thaw resistance of concrete. The SEM images indicate that the ash effect of ceramic powder and mineral powder increases C-S-H gel, fills pores to improve the compactness of concrete internal structure. Meanwhile the se-condary hydration reaction reduces Ca(OH)2(poor orientation crystal)content to enhance the micro-interface bond strength and macroscopic properties of concrete.
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Received: 04 March 2020
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