Duan Fuqiang, Zhu Han, Ibrahim Yasser E, Adamu Musa
School of Civil Engineering, Tianjin University, Tianjin 300350, China.
Engineering Management Department, College of Engineering, Prince Sultan University, Riyadh 11586, Saudi Arabia.
Materials (Basel). 2022 Aug 10;15(16):5490. doi: 10.3390/ma15165490.
Crumb rubber concrete (CRC) is a concrete that contains rubber crumbs. This article presents a study of three experiments on long aged CRC specimens that were cored from a decade old CRC bridge deck in Tianjin, China. The three experimental tests conducted were: (1) the flexural stress-strain test on semi-circular disk specimens; (2) the accelerated steel-rebar corrosion test and (3) the carbonation test. In addition, the in situ carbonation test was also carried out on the CRC bridge deck. The flexural stress-strain test results showed that the CRC semi-circular disk specimens exhibited a ductile pattern and high-energy absorbing capacity with its flexural tensile strength being at 5 MPa and the flexural modulus of 10 GPa. The steel corrosion rust rate via the calculation of steel mass loss before and after the test in the accelerated steel-rebar corrosion test remained extremely low. The carbonation test results showed that in comparison with the prediction of two popular carbonation models, the carbonation in the CRC bridge deck took place at a much slower rate during the last 13 years. All of the results obtained in this study are reported for the first-time and indicate that these CRC cored specimens exhibit good mechanical properties and excellent durability characteristics after a decade in service, which may provide the technical knowledge for the possible future application of CRC in concrete constructions.
橡胶颗粒混凝土（CRC）是一种含有橡胶颗粒的混凝土。本文介绍了对取自中国天津一座已有十年历史的CRC桥面板的长期老化CRC试件进行的三项试验研究。进行的三项试验分别为：（1）对半圆形圆盘试件进行弯曲应力-应变试验；（2）加速钢筋腐蚀试验；（3）碳化试验。此外，还对CRC桥面板进行了现场碳化试验。弯曲应力-应变试验结果表明，CRC半圆形圆盘试件呈现出延性模式和高能量吸收能力，其弯曲抗拉强度为5MPa，弯曲模量为10GPa。通过加速钢筋腐蚀试验中试验前后钢材质量损失计算得出的钢材腐蚀锈蚀率仍然极低。碳化试验结果表明，与两种常用碳化模型的预测相比，在过去13年中，CRC桥面板中的碳化发生速率要慢得多。本研究首次报告了所有获得的结果，表明这些CRC芯样试件在服役十年后表现出良好的力学性能和优异的耐久性特征，这可能为CRC未来在混凝土结构中的应用提供技术知识。
