ポーラスコンクリートの静弾性係数推定式と空隙補正係数

抄録

The Hashin-Hansen’s equation introduced from the low of mixture is established for estimating the static modulus of elasticity of the cement concrete as a two-phase composite material. In previous study, the authors proposed an estimating formula of the static modulus of elasticity of porous concretes based on the Hashin-Hansen’s equation with a correction coefficient of voids. However, the proposed formula was introduced by using the estimated value of the static modulus of elasticity of the coarse aggregate. This paper defines the compressive properties of the porous concretes using coarse aggregates with the known value of the static modulus of elasticity, and then the applicability of the estimating formula of the static modulus of elasticity of porous concretes and the equation for the correction coefficient of voids are discussed. The porous concretes using cement mortars as a binder and coarse aggregates of crushed hard sandstone and limestone are prepared with the water-cement ratios of 22.5, 25.0 and 30.0%, and the percentage of target voids of 10, 15, 20, 25 and 30%. The porous concrete specimens are cured under 24h-20°C-90%(RH)-moist+ 24h-70°C-hot water+1h-20°C-water and subjected to the total voids test and compression test for measuring the static modulus of elasticity. The cement mortar specimens are prepared by same procedures and measured for the static modulus of elasticity. The test results show that the correlation between the estimated and measured values of the static modulus of elasticity of the porous concretes are recognized. In conclusion, the applicability of the previously proposed formula for estimating the static modulus of elasticity of porous concretes is recognized. And the equation of the correction coefficient of voids is newly proposed.