Research on the effects of fly ash and silica fume on some properties of high-strength concrete for the construction building of coastal areas

Abstract

The sustainability of constructions depends on the resistance of concrete and steel reinforcement to physical and chemical aggressors from the environment. High – strength concrete with a high consistency, low permeability and resistance to environmental erosion, is preferred to be used in infrastructure construction, especially in coastal and islands areas. This paper aims to study on the mechanical properties of high-strength concrete using a mixture of fly ash and silica fume additive. Experimental obtained results show that high-strength concrete containing fly ash and silica fume with different mixing ratios have good performance (spread: 390 ÷ 625 mm and slump: 14 ÷ 20,5cm) and high compressive strength at 28 days (47 to 75MPa). In addition, the protection time of steel reinforcement according to NT Build 356-2009 can reach 85 days for samples containing 10% silica fume. This result shows that the high-strength concrete made from a mixture of fly ash and silica fume can be used in coastal and island infrastructure.