Basalt fiber(BF)and hydrated calcium silicate(CSH)crystal core early strengthening agents,respectively,have a prominent role in improving the toughness and compressive strength of concrete.In order to study the change rule of the mechanical properties of concrete under the combined action of the two,BF and CSH of 6 mm and 18 mm were selected to be mixed into concrete at different mass ratios.The compressive strength,split tensile strength and flexural strength of the specimens were investigated,and the hydration products were characterized.The results show that mixing BF and CSH crystal core early strengthening agent can effectively improve the mechanical properties of concrete,and the enhancement effect of 18 mm BF on the mechanical properties of concrete is better than that of 6 mm.When the ratio of BF to CSH of 18 mm was 0.10∶0.45,the compressive strength increased by 9.1%compared with the control group.When the ratio of the two was 0.05∶0.45,the split tensile strength and fracture strength increased by 24.1%and 18.3%,respectively,compared with the control group.XRD and SEM tests show that CSH can induce the formation of more hydrated calcium silicate and ettringite,which makes the system structure more compact and thus improves the mechanical properties of concrete.
维普
万方数据