COMPRESSIVE AND FLEXURAL STRENGTH PROPERTIES OF POROUS CONCRETES USING POLYMER-MODIFIED MORTARS AS BINDER

Abstract

This paper deals with the compressive and flexural strength properties of the porous concrete using polymer-modified mortars as binder. The applicability of the strength estimating equation for the porous concrete based on the ratio of the strength of the porous concrete to binder strength proposed by the research committee concerning the porous concrete of Japan Concrete Institute （JCI） is also discussed. The polymer-modified mortars using various polymer dispersions for cement modifier and with polymer-cement ratios of 0, 2, 4 and 6％ are prepared as binders for the porous concretes. The porous concretes with the target voids of 10, 20 and 30％ are prepared by using the polymer-modified mortars. After curing under prescribed conditions for 28d, the specimens of the polymer-modified mortars and porous concretes are subjected to compressive and flexural strength tests. The total and continuous voids of the porous concrete are also measured. As a result, the use of the polymer-modified mortar as the binder improves the flexural strength of the porous concrete. The strength estimating equation proposed by JCI research committee is applicable for estimating the compressive and flexural strengths of the porous concrete using various type of the polymer-modified mortar as the binder.