Modelling of strength characteristics of silica fume/glass ternary blended concrete using destructive and non-destructive testing methods

Abstract

The need to promote solid waste in concrete production prompted the use of waste glass powder (WGP) and silica fume (SF) powder in partial replacement for ordinary Portland cement in ternary blended concrete. The concrete was prepared with a total binder of 350 kg (in 1 m3) with 90% of cement and 10% the combination of silica fume and waste glass powder. The water/binder ratio was 0.42, and the fine aggregate to the total aggregate was 0.4. Models of wet density and 90-day strength development were presented in terms of age, WGP, and SF. Similarly, the concrete compressive strength and elastic/shear moduli were modelled for rebound numbers and response frequencies. The impact of geometrical shape and aspect ratio was also studied using cylindrical (100 - and 75-mm diameters) and rectangular specimens with an aspect ratio of 4 and 5. Transverse response frequency decreased with an increase in sample diameter and aspect ratio. The 90-day strength of C90G2.5S7.5 had a maximum strength of 55.5 MPa. Furthermore, the ternary blended sample (C90GyS10-y) was better than glass blended concrete (C90G10S0) in terms of 28-day strength, elastic and shear moduli, while the presence of SF (C90G0S10) decreased the response frequencies of OPC concrete (C100G0S0).

Keywords

• Compressive strength
• Schmidt hammer
• Response frequency
• Non-destructive testing
• Waste glass-silica fume concrete