Behavior of Self-Compaction Geopolymer Concrete Using Silica Fume with Various Replacement of R Sand and M Sand

The Mechanical properties of Self Compacting Geo polymer Concrete (SCGC) by partial replacement of Fly ash with Silica Fume was investigated in this paper. The work focused on the concrete mixes with a fixed water-to-geopolymer solid (W/G's) ratio of 0.33 by mass and a constant total binder content of 450 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 for molarity of 8M, 10M, 12M, and 14M of SCGC were assessed through slump flow, T50cm Slump flow, V-funnel, L-box and U-Box test methods. Hardened concrete tests were limited to compressive, splitting tensile and flexural strengths, for the age of 7, 14 and 28 days. After casting the specimens along with steel mould were placed in the oven for 48 hours after that the specimen are maintained in Ambient curing until the test day. 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%.Self-compacting geopolymer concrete is prepared from source materials of Fly ash and Silica Fume mixed with alkali activators such as Sodium Hydroxide and sodium silicate. Super Plasticizer is added to achieve the properties of self-compacting concrete.