Effect of silica fume on the fresh and hardened properties of fly ash-based self-compacting geopolymer concrete
来源期刊：International Journal of Minerals Metallurgy and Materials2013年第2期
论文作者：Fareed Ahmed Memon Muhd Fadhil Nuruddin Nasir Shafiq
文章页码：205 - 213
摘 要：The effect of silica fume on the fresh and hardened properties of fly ash-based self-compacting geopolymer concrete（SCGC） was investigated in this paper.The work focused on the concrete mixes with a fixed water-to-geopolymer solid（W/Gs） ratio of 0.33 by mass and a constant total binder content of 400 kg/m3.The mass fractions of silica fume that replaced fly ash in this research were 0wt%,5wt%,10wt%,and 15wt%.The workability-related fresh properties of SCGC were assessed through slump flow,V-funnel,and L-box test methods.Hardened concrete tests were limited to compressive,splitting tensile and flexural strengths,all of which were measured at the age of 1,7,and 28 d after 48-h oven curing.The results indicate that the addition of silica fume as a partial replacement of fly ash results in the loss of workability;nevertheless,the mechanical properties of hardened SCGC are significantly improved by incorporating silica fume,especially up to 10wt%.Applying this percentage of silica fume results in 4.3% reduction in the slump flow;however,it increases the compressive strength by 6.9%,tensile strength by 12.8% and flexural strength by 11.5%.
Fareed Ahmed Memon1,2，Muhd Fadhil Nuruddin1，Nasir Shafiq1
1. Department of Civil Engineering,Faculty of Engineering,Universiti Teknologi PETRONAS2. Department of Civil Engineering,Faculty of Engineering,Mehran University of Engineering and Technology
摘 要：The effect of silica fume on the fresh and hardened properties of fly ash-based self-compacting geopolymer concrete（SCGC） was investigated in this paper.The work focused on the concrete mixes with a fixed water-to-geopolymer solid（W/Gs） ratio of 0.33 by mass and a constant total binder content of 400 kg/m3.The mass fractions of silica fume that replaced fly ash in this research were 0wt%,5wt%,10wt%,and 15wt%.The workability-related fresh properties of SCGC were assessed through slump flow,V-funnel,and L-box test methods.Hardened concrete tests were limited to compressive,splitting tensile and flexural strengths,all of which were measured at the age of 1,7,and 28 d after 48-h oven curing.The results indicate that the addition of silica fume as a partial replacement of fly ash results in the loss of workability;nevertheless,the mechanical properties of hardened SCGC are significantly improved by incorporating silica fume,especially up to 10wt%.Applying this percentage of silica fume results in 4.3% reduction in the slump flow;however,it increases the compressive strength by 6.9%,tensile strength by 12.8% and flexural strength by 11.5%.
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