水泥浆-碳化协同增强再生混凝土骨料研究

Study on the Synergistic Effect of Cement Slurry-carbonation for Enhancing Recycled Concrete Aggregate

提高再生混凝土骨料(RCA)的性能对其在结构工程中得到更广泛的应用有着重要的研究意义。本研究利用水泥浆-碳化协同增强方法对再生混凝土骨料(RCA)进行强化处理,并与未强化、单一水泥浆增强、单一碳化增强处理RCA进行对比分析。结果表明:协同强化后RCA的基本性能明显改善,吸水率、压碎值、孔隙率较未处理RCA分别降低了16.04%、19.77%、36.29%;与单一强化相比,水泥水化与碳化的协同效应可以在加固RCA表面的同时,进一步利用碳化产物修补RCA的附着砂浆和界面过渡区(ITZ)。水泥浆-碳化协同强化是一种效果明显、环境友好且成本低的RCA增强方法。

Improving the performance of recycled concrete aggregate(RCA)has important research implications for their wider application in structural engineering.In this study,the RCA was enhanced by the synergistic effect of cement paste-carbonation,and analyzed in comparison with unreinforced,single cement slurry reinforced,and single carbonation reinforced treated RCA.The results showed that the basic properties of RCA after cement slurry-carbonation synergistic strengthening were significantly improved,and the water absorption,crushing value and porosity were reduced by 16.04%,19.77%and 36.29%,respectively,compared with untreated RCA.In contrast to single reinforcement,the synergistic effect of cement hydration and carbonation can further utilize the carbonation products to repair the adhesion mortar and interfacial transition zone(ITZ)of RCA while reinforcing the RCA surface.It can be clearly stated that the use of cement slurry-carbonation synergistic reinforcement treatment is an effective,environmentally friendly and low-cost method of RCA enhancement.