DURABILITE DES BETONS A BASE DES GRANULATS DE LA REGION DE BISKRA

LOUMACHI, LAZHAR (2023) DURABILITE DES BETONS A BASE DES GRANULATS DE LA REGION DE BISKRA. Doctoral thesis, Faculté des Sciences et de la technologie.

Text Thése finale loumachi 2023.pdf Download (6MB)

Abstract

The increasing number of quarries producing aggregates has led to a diversification of deposits, thus resulting in a variety of types of aggregates. In this context, the granular composition plays a crucial role in the short and long term performance of concretes. This doctoral thesis focuses on the influence of various large aggregates from different quarries (Ain-Touta, El-hajeb and Ziani) and various mineral additions such as limestone, pozzolana and slag, on the mechanical properties and durability of ordinary concretes. The main objective is to analyze the interaction between the morphology of large aggregates and the type of fine addition on the mechanical properties and durability of concretes. The mineral addition rates vary from 10%, 15% to 20% relative to the mass of cement. In addition, chemical durability tests, involving immersion in 5% solutions of H2SO4 and HCL, were carried out. The results of this study highlight the influence of additions on the properties of concrete, in relation to the shape of the aggregates, with particular emphasis on the interfacial zone between the paste and the aggregates. Among the various additions studied, pozzolan turns out to be the most effective in terms of improving the performance of concrete, compared to slag and limestone filler. In particular, the incorporation of 20% pozzolan results in a significant improvement in the transition between aggregate and matrix, leading to a maximum compressive strength at 60 days of 51 MPa. These findings provide essential information on the complex interactions between aggregates and additives, which are reflected in the mechanical properties and durability of concretes.

Actions (login required)

View Item