Estudio comparativo de los efectos sobre la resistencia a la flexión del hormigón armado con ceniza volcánica.

Abstract

This experimental work aims to study the mechanical behavior of concrete beams, adding volcanic ash within the dosage as a replacement for cement in different percentages, for a compressive strength of 21 MPa; It seeks to compare the results between the specimens made with standard concrete (HS) and those made of concrete with 10% and 20% volcanic ash (HCV10 and HCV20, respectively) both in simple compression, bending, modulus of elasticity and permeability tests, whose procedures are detailed according to current regulations. This study is of interest because the use of natural pozzolanic materials within the concrete dosage is becoming increasingly popular and it is expected that this trend will continue in the following years, accompanied by technological progress and the desire for sustainable development. For the execution of the experimental part, the weight dosage was first obtained for each of the concrete mixtures (HS, HCV10 and HCV20), followed by the molding and manufacturing of cylindrical and prismatic specimens which were cured for the realization of relevant tests. 63 cylinders were manufactured, 27 for compression tests, 18 for modulus of elasticity and 18 for permeability. 18 simple concrete beams and 18 reinforced concrete beams were cast for the flexural tests. The results were based on a comparison of the properties of each group of specimens according to the percentage of replacement and corresponding ages, in addition to an economic analysis with respect to conventional concretes.