Mechanical Properties and Comprehensive Assessment of RAP-ECC Materials

ZHAN Xuefang; ZHAO Tianpu; CHEN Jingyuan; LIU Xiaojun; ZHAO Yibin; WANG Haolei

doi:10.3724/j.gyjzG25071703

Volume 56 Issue 8

Aug. 2026

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Article Navigation > INDUSTRIAL CONSTRUCTION > 2026 > 56(8): 158-168

ZHAN Xuefang, ZHAO Tianpu, CHEN Jingyuan, LIU Xiaojun, ZHAO Yibin, WANG Haolei. Mechanical Properties and Comprehensive Assessment of RAP-ECC Materials[J]. INDUSTRIAL CONSTRUCTION, 2026, 56(8): 158-168. doi: 10.3724/j.gyjzG25071703

Citation:

ZHAN Xuefang, ZHAO Tianpu, CHEN Jingyuan, LIU Xiaojun, ZHAO Yibin, WANG Haolei. Mechanical Properties and Comprehensive Assessment of RAP-ECC Materials[J]. INDUSTRIAL CONSTRUCTION, 2026, 56(8): 158-168. doi: 10.3724/j.gyjzG25071703

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Mechanical Properties and Comprehensive Assessment of RAP-ECC Materials

doi: 10.3724/j.gyjzG25071703

School of Civil Engineering, Central South University of Forestry and Technology, Changsha 410004, China

Received Date: 2025-07-17
Available Online: 2026-11-06

Abstract

Abstract

To enhance the mechanical properties and environmental sustainability of ECC， the reclaimed asphalt pavement （RAP） was crushed into powder and fine sand to fully replace silica sand in engineered cementitious composites （ECC）， developing RAP-ECC materials. To investigate the mechanical properties， strain hardening and fracture characteristics， microstructure， and sustainability of RAP-ECC， this study first measured the asphalt content in RAP using centrifugal separation. Uniaxial tensile， compressive， and four-point bending tests were conducted on RAP-ECC with different RAP incorporation ratios （0%， 25%， 50%， 60%， 100%）. Subsequently， three-point bending and single-crack tensile tests were performed on the optimal RAP-ECC mix. Furthermore， scanning electron microscopy was used to analyze the fiber failure conditions and the microstructure of the interfacial transition zone （ITZ） between the aggregate and matrix in the fractured tensile specimens of RAP-ECC. Finally， a comprehensive evaluation index for RAP-ECC was established by integrating mechanical properties， embodied carbon emissions， and economic efficiency. The results indicate that after uniaxial tension， RAP-ECC exhibited significant strain hardening and multiple microcrack characteristics. The incorporation of RAP improved the tensile， compressive， and flexural strengths of ECC. The first crack strain of RAP-50% was 1.3 times that of ECC， its tensile strength was 1.32 times higher， and its ultimate strain reached 4.68%. Additionally， the flexural strength of RAP-50% thin plates was 1.38 times that of ECC thin plates. The average compressive strength of RAP-60% was approximately 1.25 times that of ECC. However， the incorporation of RAP reduced the ultimate tensile strain， with RAP-50% exhibiting the maximum ultimate tensile strain， which was similar to that of ECC. The calculated PSH values for ECC and RAP-50% were 12.00 and 14.02， respectively， which are greater than 2.7. RAP-50% had the highest value of comprehensive evaluation indicators， which was 74.3% higher than that of ECC， indicating its optimal comprehensive performance.

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References(20)

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