Hong Xiaojiang, Lee Jin Chai, Ng Jing Lin, Md Yusof Zeety, He Qian, Li Qiansha
Department of Civil Engineering, Faculty of Engineering, Technology and Built Environment, UCSI University, Kuala Lumpur 56000, Malaysia.
Department of Civil Engineering, Faculty of Civil and Hydraulic Engineering, Xichang University, Xichang 615013, China.
Materials (Basel). 2023 Mar 30;16(7):2756. doi: 10.3390/ma16072756.
An effective pathway to achieve the sustainable development of resources and environmental protection is to utilize shale ceramsite (SC), which is processed from shale spoil to produce high-strength lightweight concrete (HSLWC). Furthermore, the urgent demand for better performance of HSLWC has stimulated active research on graphene oxide (GO) in strengthening mechanical properties and durability. This study was an effort to investigate the effect of different contents of GO on HSLWC manufactured from SC. For this purpose, six mixtures containing GO in the range of 0-0.08% (by weight of cement) were systematically designed to test the mechanical properties (compressive strength, flexural strength, and splitting tensile strength), durability (chloride penetration resistance, freezing-thawing resistance, and sulfate attack resistance), and microstructure. The experimental results showed that the optimum amount of 0.05% GO can maximize the compressive strength, flexural strength, and splitting tensile strength by 20.1%, 34.3%, and 24.2%, respectively, and exhibited excellent chloride penetration resistance, freezing-thawing resistance, and sulfate attack resistance. Note that when the addition of GO was relatively high, the performance improvement in HSLWC as attenuated instead. Therefore, based on the comprehensive analysis of microstructure, the optimal addition level of GO to achieve the best mechanical properties and durability of HSLWC is considered to be 0.05%. These findings can provide a new method for the use of SC in engineering.
实现资源与环境保护可持续发展的一条有效途径是利用页岩陶粒（SC），它由页岩废料加工而成，用于生产高强度轻集料混凝土（HSLWC）。此外，对HSLWC更好性能的迫切需求激发了对氧化石墨烯（GO）在增强力学性能和耐久性方面的积极研究。本研究旨在探讨不同含量的GO对由SC制成的HSLWC的影响。为此，系统设计了六种含有0 - 0.08%（按水泥重量计）GO的混合物，以测试其力学性能（抗压强度、抗折强度和劈裂抗拉强度）、耐久性（抗氯离子渗透性、抗冻融性和抗硫酸盐侵蚀性）以及微观结构。实验结果表明，0.05%的GO最佳用量可使抗压强度、抗折强度和劈裂抗拉强度分别最大提高20.1%、34.3%和24.2%，并表现出优异的抗氯离子渗透性、抗冻融性和抗硫酸盐侵蚀性。需要注意的是，当GO的添加量相对较高时，HSLWC的性能改善反而减弱。因此，基于微观结构的综合分析，认为实现HSLWC最佳力学性能和耐久性的GO最佳添加量为0.05%。这些研究结果可为SC在工程中的应用提供一种新方法。
