磺化石墨烯对再生砂超高性能混凝土力学性能和耐久性能的影响  

Effects of Graphene Sulfonate Nanosheets on Mechanical Properties and Durability of Ultra-high Performance Concrete Produced by Recycled Sand

作　　者：褚洪岩 高李 秦健健 汤金辉 蒋金洋[2] CHU Hongyan;GAO Li;QIN Jianjian;TANG Jinhui;JIANG Jinyang(College of Civil Engineering,Nanjing Forestry University,Nanjing 210037,China;School of Materials Science and Engineering,Southeast University,Nanjing 211189,China)

机构地区：[1]南京林业大学土木工程学院,南京210037 [2]东南大学材料科学与工程学院,南京211189

出　　处：《材料导报》2022年第5期91-95,共5页Materials Reports

基　　金：国家自然科学基金(51808294);江苏省高等学校自然科学研究基金(18KJB430017)。

摘　　要：鉴于利用再生砂制备超高性能混凝土(UHPC)会导致其性能劣化,采用磺化石墨烯(GSN)来改善再生砂UHPC(RS-UHPC)的相关性能,探究不同掺量的GSN对RS-UHPC力学性能和耐久性能的影响,还研究了GSN对RS-UHPC孔结构的影响。研究表明:(1)GSN能使RS-UHPC的孔隙率降低3.75%~10.24%;(2)GSN能使RS-UHPC的抗压强度、抗折强度、弹性模量分别提高3.24%~14.72%、5.21%~20.09%、3.56%~11.84%;(3)GSN能明显提高RS-UHPC的抗冻融性能和抗氯离子渗透性;(4)综合考虑GSN对RS-UHPC的孔结构、力学性能和耐久性能的影响,GSN在RS-UHPC中的优选掺量为0.06%。Using recycled sand to produce ultra-high performance concrete(UHPC)deteriorates its mechanical properties and durability.The properties of UHPC produced by recycled sand(RS-UHPC)could be improved by adding graphene sulfonate nanosheets(GSN).The study was aimed to investigate the effects of the GSN on the mechanical properties and durability of RS-UHPC,and the influence of the GSN on the pore structure of RS-UHPC was also studied.It was found that,(1)the porosity of RS-UHPC was reduced by 3.75%—10.24%,due to the addition of GSN;(2)the compressive strength,flexural strength,and elastic modulus of RS-UHPC were increased by 3.24%—14.72%,5.21%—20.09%,and 3.56%—11.84%,respectively,because of the use of GSN;(3)the freeze-thaw resistance of the RS-UHPC and the resistance of the RS-UHPC to penetration of chloride ions were significantly improved,due to the incorporation of GSN;(4)the optimal content of GSN was 0.06%,considering the effects of GSN on the pore structure,mechanical properties,and durability of RS-UHPC.

关 键 词：超高性能混凝土 再生砂 力学性能 耐久性 磺化石墨烯 孔结构 

分 类 号：TU528.09[建筑科学—建筑技术科学]