Matching Mechanism Between Grouting Material and Lightweight Aggregate in Preplaced Lightweight Aggregate Concrete

Abstract

Abstract: In this paper, lightweight and high strength grouting materials with different strength grades(60,75,90,100,110,120 MPa) were prepared. By compounding with different types and strengths of lightweight aggregate (high strength spherical fly ash ceramsite, low strength spherical fly ash ceramsite, gravel-shaped shale ceramsite), the matching mechanism between grouting material and lightweight aggregate in preplaced lightweight aggregate concrete was studied. The results show that there is a piecewise linear relationship between the strength of preplaced lightweight aggregate concrete and grouting material strength, and the slope of fitting curve can approximately reflect the utilization efficiency of the strength of grouting material. With the increase of the strength grade of grouting material, the utilization rate of concrete to the strength of grouting material decreases. The compressive strength and grain shape of aggregate also affect the utilization rate of the strength of grouting material. Due to the interlocking effect, the strength of lightweight aggregate concrete prepared by gravel-shaped shale ceramsite is significantly higher than that of concrete prepared by spherical fly ash aggregate with similar compressive strength. Two types of preplaced lightweight aggregate concrete with compressive strength of 81.2 MPa, dry apparent density of 1 735 kg/m³ and compressive strength of 68.2 MPa, dry apparent density of 1 520 kg/m³ were prepared by using high strength spherical fly ash ceramsite and gravel-shaped ceramsite, respectively.

Key words: concrete, lightweight aggregate, lightweight and high strength, preplaced lightweight aggregate, aggregate grain size

CLC Number:

TU528

WANG Yingxiang, PENG Bo, WANG Jiantao, LIU Yunpeng. Matching Mechanism Between Grouting Material and Lightweight Aggregate in Preplaced Lightweight Aggregate Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(7): 2479-2489.

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