双掺石墨烯-氧化石墨烯再生粗骨料混凝土力学性能和抗冻耐久性研究

摘要/Abstract

摘要： 为解决建筑垃圾再生粗骨料混凝土(RAC)力学性能及抗冻耐久性差问题,将氧化石墨烯(GO)及石墨烯(G)双掺作为纳米改性剂,研究不同比例GO与G双掺对RAC工作性、力学性能、抗冻耐久性及微观结构的影响。结果表明:与未掺改性剂的RAC相比,双掺0.03%G和0.06%GO(以水泥的质量百分比计算)对RAC力学性能改善效果最显著,其7 d抗压及劈裂抗拉强度分别提高了29.14%、30.60%;双掺0.03%G和0.06%GO还能够有效降低RAC冻融循环后的质量损失率及强度损失率,从而改善RAC抗冻耐久性。微观结构分析表明双掺0.03%G与0.06%GO可以改善水化产物规整度,明显减少RAC的累计孔体积,增加RAC结构密实性。因此,GO与G双掺在改善RAC性能方面具有协同效应。

关键词: 氧化石墨烯, 石墨烯, 再生粗骨料混凝土, 力学性能, 冻融作用, 微观结构

Abstract: In order to solve the problem of poor mechanical properties and the frost resistance durability of recycled coarse aggregate concrete (RAC) from construction waste, graphene oxide (GO) and graphene (G) were added as nano modifiers. The effects of dual doping of GO and G with different ratios on the mechanical properties, frost resistance durability, and microstructure of RAC have been thoroughly studied. The results show that compared with RAC without any modifiers, dual doping of 0.03% G and 0.06% GO (calculated by mass percentage of cement) has the most significant improvement effect on the mechanical properties of RAC. The compressive and splitting tensile strength increases by 29.14% and 30.60% respectively after 7 d. The results of frost resistance durability show that dual doping of 0.03%G and 0.06%GO can effectively reduce the mass loss rate and strength loss rate of RAC after freeze-thaw cycles, thereby improving the frost resistance durability of RAC. Microstructure analysis shows that dual doping of 0.03% G and 0.06% GO can improve the regularity of hydration products, significantly reduce the cumulative pore volume of RAC, and increase the compactness of RAC structure. Therefore, dual doping of GO and G dual have a synergistic effect in improving RAC performance.

Key words: graphene oxide, graphene, recycled coarse aggregate concrete, mechanical property, freeze-thaw action, microstructure

中图分类号:

TU528

刘宏波, 贾小静, 张博洋, 孙岩, 李泳, 常璞, 孙婧. 双掺石墨烯-氧化石墨烯再生粗骨料混凝土力学性能和抗冻耐久性研究[J]. 硅酸盐通报, 2024, 43(9): 3359-3367.

LIU Hongbo, JIA Xiaojing, ZHANG Boyang, SUN Yan, LI Yong, CHANG Pu, SUN Jing. Mechanical Properties and Frost Resistance Durability of Recycled Coarse Aggregate Concrete Dual Doping Graphene and Oxide-Graphene[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(9): 3359-3367.

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