Effect of Recycled Fine Aggregate on Mechanical Properties and Carbonation Durability of High Ductility Cementitious Composites

Abstract

Abstract: In order to promote the application of recycled fine aggregate (RFA) in high ductility cementitious composites (HDCC), the effect of RFA replacement rate (0%, 25%, 50%, 75%, 100%, mass fraction) on compressive strength, tensile properties, four-point flexural strength and carbonation durability of HDCC was studied. The results show that with the increase of RFA replacement rate, the compressive strength of HDCC decreases gradually, but the tensile properties and flexural strength increase significantly. Under 100% RFA replacement rate, the peak strain of HDCC reaches 3.06%, and the flexural strength reaches 7.9 MPa, which is 31.33% and 11.27% higher than that of natural fine aggregate HDCC, respectively, showing good ductility. When the replacement rate of RFA is higher than 50%, it is helpful to improve the carbonation durability of HDCC. Based on the fitting of test results, a HDCC carbonation depth prediction model related to RFA replacement rate is established.

Key words: high ductility cementitious composite, recycled fine aggregate, compressive strength, tensile property, flexural strength, carbonation durability

CLC Number:

TU528.041

WU Yinjia, WANG Xinjie, ZHU Pinghua, SUN Weihao, XIONG Lei. Effect of Recycled Fine Aggregate on Mechanical Properties and Carbonation Durability of High Ductility Cementitious Composites[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(8): 2984-2995.

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