Alternative Estimation of Effective Young’s Modulus for Lightweight Aggregate Concrete LWAC

Meriem Fakhreddine Bouali Meriem Fakhreddine Bouali,Hima Abdelkader Hima Abdelkader

doi:10.3221/igf-esis.52.07

Abstract

The prediction of effective mechanical properties of composite materials using analytical models is of significant practical interest in situations in which tests are impossible, difficult, or costly. Many experimental and numerical works are attempting to predict the elastic properties of Lightweight Aggregate Concrete (LWAC). In order to choose the optimized prediction composite model, the purpose of this paper is to appraise the effective Young’s modulus of LWAC using two-phase composite models. To this effect, results of previous experimental research have used as a platform, upon which, 07 two-phase composite models were applied. The outcomes of this comparative analysis show that not all two-phase analytical models can be directly used for predicting Young’s modulus of LWAC. The Hashin-Hansen and Counto2 models are in close concordance with the experimental Young’s modulus of all LWAC used for comparison in this study. Thus, the precision of this prediction model demonstrates its effectiveness and potential application as a model for Lightweight Aggregate Concrete. They were found more appropriate for reasonable prediction of elasticity modules of the LWAC.

Highlights

R ecently, special attention has been paid to the development of Lightweight Aggregate Concrete (LWAC) 1, 2, 3 which offers many advantages as a building material, including low weight, easier construction and better resistance compared with ordinary concrete
We look for the models to estimate the Young modulus for Lightweight Aggregate Concrete (LWAC) in terms of the properties and volume fractions of its constituents
CComparative analysis omparison between the estimative results of effective elastic modulus of LWAC obtained as a result of calculations of the Eqns. (2-9) and those of experimental data have been presented in Tabs. 5, 6 and 7 respectively

Summary

Introduction

R ecently, special attention has been paid to the development of Lightweight Aggregate Concrete (LWAC) 1, 2, 3 which offers many advantages as a building material, including low weight, easier construction and better resistance compared with ordinary concrete. Diverse explicit models of the literature are utilized Their application to the prediction of LWAC behaviors shows a wide dissimilarity between the different approaches when the volume fraction of reinforcement is more than 40% and when the contrast between the phases grows 9. An efficient and accurate model is useful to reduce the cost and duration of the experimental mix design studies In this present work, a large bibliography data for different LWAC tested experimentally and published in the literature are used: De Larrard 7 , Yang and Huang 8 , and Ke Y et al 9. Prediction possibilities using composite material models in determination of modulus of elasticity were sought and some suggestions were made to a statistical study

Objectives

Results

Conclusion