In this study, we reduced the restrained shrinkage of lightweight polymer concrete (LWPC) containing waste rubber powder (WRP) to develop a novel low-shrinkage LWPC for use in wet flue gas desulfurization (WFGD) or other high-temperature and strongly corrosive environments. We investigated the effects of ceramsite aggregate and WRP (0%, 2.5%, 5.0% and 7.5% of binder) on restrained shrinkage and the microstructure of polymer concrete (PC). The experimental results indicate that restrained shrinkage in PC with ceramsite aggregate and WRP is significantly less than that of PC with crushed stone aggregate. Unusual stress relaxation behavior of LWPC was observed. When WRP reached 7.5% of binder, the value of restrained shrinkage was nearly zero. Ultra-depth three-dimensional microscopy (UDTDM), X-ray computed tomography (XCT), and scanning electron microscopy (SEM) were used to characterize PC properties for the determination of stress relaxation mechanisms.

在这项研究中，我们降低了含有废橡胶粉（WRP）的轻质聚合物混凝土（LWPC）的约束收缩率，从而开发了一种新型的低收缩率LWPC，用于湿法烟气脱硫（WFGD）或其他高温和强腐蚀环境。我们研究了陶粒骨料和WRP（粘合剂的0％，2.5％，5.0％和7.5％）对聚合物混凝土（PC）的收缩收缩率和微观结构的影响。实验结果表明，具有陶粒骨料和WRP的PC抑制收缩明显小于具有碎石集料的PC。观察到LWPC异常的应力松弛行为。当WRP达到粘合剂的7.5％时，收缩收缩率几乎为零。超深度三维显微镜（UDTDM），X射线计算机断层扫描（XCT），