Estudio de la sustitución parcial de cemento de alta resistencia inicial por ceniza volcánica de tamaño menor al tamiz #200 en bloques huecos de hormigón

Abstract

The present study aims to determine a dosage for hollow concrete blocks, in which the cement is replaced by different percentages of volcanic ash that passes the #200 sieve, in a such a way that the block properties comply the requirements established in INEN 3066 regulation.

Different dosages were elaborated following the recommendation defined in the second method of ACI 211.2. First of all, aggregates ratio was evaluated in different mixtures in order to vary afterward the content cement, and in this way analyze the influence in the block strength. Thus, a higher compressive strength than 4 Mpa was obtained for the pattern block.

Once the pattern block reached 5,74 MPa in the average compressive strength, the different tests were carried out with the percentages of volcanic ash (5%, 10%, 20% and 30%). The blocks tested with the different percentages decreased their strength (4,86 MPa, 3,84 MPa, 2,90 MPa and 2,31 Mpa) respectively in comparison with the pattern block. Therefore, the samples with the 5% of volcanic ash, despite decreasing their strength by 15% compared to the pattern block, they meet the requirement of 4 MPa compressive strength. For this reason, it´s possible to elaborate hollow concrete for non-structural walls.