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Title: Biphasic Compressive Behavior of Structural Lightweight Concrete

Author(s): José Alexandre Bogas, Beatriz Ferrer, Jorge Pontes, and Sofia Real

Publication: Materials Journal

Volume: 114

Issue: 01

Appears on pages(s): 49-56

Keywords: compressive behavior; structural efficiency; structural lightweight aggregate concrete

Date: 1/1/2017

Abstract:
This paper addresses the compressive behavior and structural efficiency of structural lightweight aggregate concrete (SLWAC) produced with different types of lightweight aggregates (LWA), covering strength classes from LC12/13 to LC55/60 and density classes from D1.6 to D2.0. The possible failure modes and the influence of the main constituents of concrete on its compressive strength are analyzed. The mechanical behavior of SLWAC is characterized through its compressive strength, limit strength, ceiling strength, and the strength of the aggregate in concrete, allowing the definition of strength and density classes for SLWAC produced with each type of LWA. A biphasic model to estimate the strength of SLWAC is evaluated, and high correlations between experimental and design values are obtained. Expressions for estimating the strength of the aggregate in concrete are defined, which are valid for different types of coarse lightweight aggregate.