On Prediction of Compression Strength for Porous Concretes

Abstract

The object of this paper is to establish a prediction equation for strength of porous concretes f_c. The strength values were postulated to be as a function of void ratio e and cement-water ratio α. Compression tests were conducted for porous concretes with No.5 crushed stones or recycled aggregates under different e and α values. Plotting the test data in the space with e, α and f_c, it was found that f_c values laid on a certain surface in the space. An equation was developed by formulating the surface as products of two independent linear equations for e and α. The compression strength values estimated by the equation were within almost less than 10% errors. The proposed equation expressed a good agreement to the experimental results.