Manufacturing of mortars and concretes non-traditionals, by portland cement, metakaoline and gypsum (15.05%)

Abstract

In a thorough previous research (1), it appeared that creation, evolution and development of the values of compressive mechanical strength(CS) and flexural strength(FS), measured in specimens 1×1×6cm of mortar type ASTM C 452-68(2), manufactured by ordinary portland cement P-1(14.11% C3A) or PY-6(0.00% C3A), metakaolin and gypsum(CaSO4·2H2O) -or ternary cements,CT-, were similar to the ones commonly developed in mortars and concretes of OPC. This paper sets up the experimental results obtained from non-traditional mortars and concretes prepared with such ternary cements -TC-, being the portland cement/metakaolin mass ratio, as follows: 80/20, 70/30 and 60/40. Finally, the behaviour of these cements against gypsum attack, has been also determined, using the following parameters: increase in length(ΔL%), compressive, CS, and flexural, FS, strengths,and ultrasound energy, UE. Experimental results obtained from these non-traditional mortars and concretes, show an increase in length(ΔL), in CS and FS, and in UE values, when there is addition of metakaolin.