Early mechanical properties of alkali-activated green ultra-high performance concrete
To study the mechanical properties of Green Ultra-high Performance Concrete(GUHPC)made by alkali activation in the early stage of 7 days,relevant experiments were designed,and the effects of different fly ash content,steel fiber content,and water-binder ratio on the compressive strength and splitting tensile strength of GUHPC were analyzed.The microstructure of the reaction products was observed,and the changes of the products under different fly ash content were compared and analyzed to verify the reliability of the conclusions.The results showed that the compressive strength of GUHPC at 7 days increased linearly with the decrease of fly ash content,the increase of steel fiber content,and the decrease of water-binder ratio.In the case of no steel fi-ber content,the compressive strength reached the minimum value of 89.4 MPa,while when the steel fiber con-tent increased to 4%,the compressive strength significantly increased to 142 MPa,an increase of nearly 58.8%.The splitting tensile strength of GUHPC at 7 days reached the highest value of 15.19 MPa when the steel fiber content was 4%.The splitting tensile strength increased first and then decreased with the increase of fly ash content and water-binder ratio,while it continued to increase with the increase of steel fiber content.In the case of no steel fiber content,the splitting tensile strength was the lowest at 4.57 MPa;with the increase of steel fiber content,its strength increased by nearly 2.3 times.
Green Ultra-high Performance Concretecompressive strengthsplit tensile strengthmicrostructure
国家科技期刊平台
NSTL
万方数据
维普
