Performance of Ultra-High Performance Lightweight Concrete with Pottery Sand and Its Influencing Factors

Abstract

Abstract: The effects of water-binder ratio, binder-sand ratio, fly ash content, silica fume content, steel fiber content and density grade of pottery sand on working performance, mechanical properties, apparent density and ratio of strength to density of ultra-high performance lightweight concrete (UHPLC) with pottery sand were studied, and the optimal mix ratio was determined. UHPLC with dry apparent density of 1 950 kg/m³, fluidity of 233 mm (slightly higher than that of ultra-high performance concrete) and 28 d compressive/flexural strength not less than 120/20 MPa was prepared. By means of X-ray diffractometer and scanning electron microscope, the variation laws of UHPLC hydration products and microstructure with time were discussed. From the perspective of microstructure, the characteristics of interface transition zone between pottery sand and matrix, steel fiber and matrix were analyzed, and the change law of ratio of strength to density of UHPLC increasing with the increase of density grade of pottery sand was revealed under the same conditions. Through standardized regression coefficient analysis, the results indicate that steel fiber content has the greatest influence on the strength and density of UHPLC, and the contribution rates are greater than 40%. The most significant influence on the fluidity of UHPLC is the water-binder ratio, and the contribution rate is 38.18%. The binder-sand ratio has a more obvious influence on the fluidity of UHPLC, and the contribution rate is 27.20%.

Key words: ultra-high performance lightweight concrete, pottery sand, steel fiber, water-binder ratio, apparent density, contribution rate

CLC Number:

TU528.2

WANG Qing, GAO Shuchang, GAO Jiacheng, WEN Changcheng, XU Gang. Performance of Ultra-High Performance Lightweight Concrete with Pottery Sand and Its Influencing Factors[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(6): 1996-2006.

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