EXPERIMENTAL AND MICROMECHANICAL APPROACH TO ELASTIC PROPERTIES OF PERVIOUS CONCRETE

Resumo

Pervious concrete refers to a material composed by Portland cement, coarse aggregate, little
or none fine aggregate, water and, at times, additives and additions. The pervious concrete porosity
affects its elastic properties, as pointed by available studies. In the perspective of a wide use, a
comprehensive formulation of the corresponding behavior is necessary. In this context, the present
study describes a micromechanical model for the macroscopic elastic properties of the pervious
concrete. Reasoning on the representative elementary volume (REV) of such a composite, the overall
elastic characteristics are determined from the knowledge of the elastic properties of its constituents
(aggregate + cement paste + pores). Moreover, aiming the comprehension of the elastic and strength
behaviors of pervious concrete produced with local supplies (Porto Alegre, RS), this work evaluates
experimentally the following parameters: elastic modulus and uniaxial compressive strength. The
results show how the elastic properties are related to the porosity of pervious concrete produced with
local materials and confirm the possibility of estimating the elastic properties through the
micromechanical approach.