1 College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China 2 School of Materials Science and Engineering, Southeast University, Nanjing 211189, China
Abstract: 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.
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2022, Vol. 36 
