Zhou Yingwu, Wu Guojian, Li Limiao, Guan Zhipei, Guo Menghuan, Yang Lei, Li Zongjun
Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, Shenzhen University, Shenzhen 518060, China.
Key Laboratory for Resilient Infrastructures of Coastal Cities (MOE), Ministry of Education, Shenzhen 518060, China.
Polymers (Basel). 2022 Mar 11;14(6):1132. doi: 10.3390/polym14061132.
In response to resource shortage and carbon dioxide emissions, an innovative type of sustainable concrete containing LC3, seawater, sea sand, and surface-treated recycled aggregates is proposed in this study to replace traditional concrete. To understand the bond properties between the sustainable concrete and CFRP bars, an investigation was conducted on the bond behavior between sand-coated CFRP bars and advanced sustainable concrete. Pull-out tests were carried out to reveal the failure mechanisms and performance of this bond behavior. The results showed that the slip increased monotonically along with the increase in confinement. The bond strength increased up to approximately 15 MPa, and the critical ratio of C/D was reached. The critical ratio approached 3.5 for the Portland cement groups, while the ratio was determined as approximately 4.5 when LC3 was introduced. When the proportion of LC3 reached 50%, there was a reduction in bond strength. A multisegmented modified bond-slip model was developed to describe the four-stage bond behavior. In terms of bond strength and slip, the proposed advanced concrete exhibited almost identical bond behavior to other types of concrete.
针对资源短缺和二氧化碳排放问题，本研究提出了一种创新型的可持续混凝土，其包含LC3、海水、海砂和表面处理过的再生骨料，以取代传统混凝土。为了解这种可持续混凝土与碳纤维增强塑料（CFRP）筋之间的粘结性能，对涂砂CFRP筋与高性能可持续混凝土之间的粘结行为进行了研究。通过拉拔试验揭示了这种粘结行为的破坏机制和性能。结果表明，随着约束的增加，滑移单调增加。粘结强度增加到约15MPa，并达到了临界C/D比。对于硅酸盐水泥组，临界比接近3.5，而引入LC3时，该比值确定为约4.5。当LC3的比例达到50%时，粘结强度有所降低。建立了一个多段修正粘结-滑移模型来描述四阶段粘结行为。在粘结强度和滑移方面，所提出的高性能混凝土与其他类型的混凝土表现出几乎相同的粘结行为。
