Strength formation mechanism and performance of steel slag self-compacting epoxy resin concrete

• Published in: Construction & building materials Vol. 359; p. 129525
• Main Authors: Li, Yuanyuan, Li, Jun, Li, Chao, Chen, Anqi, Bai, Tao, Tang, Shimin, Wu, Shaopeng, Gao, Yangming, Zhu, Hongbin, Feng, Jianlin
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 12-12-2022
• Subjects: Actual engineering verification; Micro morphology; Pavement repair; Road expansion joints; Steel slag; Road expansion joints; Micro morphology; Actual engineering verification; Pavement repair; Steel slag
• ISSN: 0950-0618; 1879-0526
• DOI: 10.1016/j.conbuildmat.2022.129525

•Strength formation mechanism of SERC and BERC were analyzed.•Mechanical properties and road performance of SERC and BERC were compared.•SERC has better low-temperature crack and fatigue resistances than BERC.•A test section was set up to check the use of SERC in practice.
A self-compacting steel slag epoxy resin concrete (SERC) was designed with steel slag as aggregate and epoxy resin as binder for rapid repair of road expansion joints and pavement. At the same time, a group of self-compacting basalt epoxy resin concrete (BERC) with basalt as coarse aggregate and limestone as fine aggregate was set up as the control group. The element analysis and micro morphology of SERC and BERC were studied by X-ray fluorescence spectrometry (XRF) and scanning electron microscope (SEM) to reveal the strength-forming mechanism of the two epoxy resin concretes. The cube compression test and Marshall stability test were used to study the effect of the strength formation rate and temperature of SERC and BERC on the strength. In addition, the high-temperature stability, low-temperature crack resistance, water damage resistance, fatigue resistance and interlayer bonding properties of SERC and BERC were also studied. The results showed that both SERC and BERC have good mechanical properties, high temperature properties and good bonding properties, and the low-temperature crack resistance and fatigue properties of SERC are better than that of BERC. According to the verification of the actual project that has been in service for one year, SERC can be perfectly used for road expansion joints.