Influence of limestone dust and natural pozzolan on engineering properties of self-compacting repair mortars

Ahmed Omran,Said Choucha,Mohamed Ghrici

doi:10.3221/igf-esis.45.11

Ahmed Omran, Said Choucha + Show 1 more

Open Access

https://doi.org/10.3221/igf-esis.45.11

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Abstract

The main goal of this work is the formulation of a self-compacting repair mortars (SCRMs) containing limestone dust (LD) and natural pozzolan (NP). For this purpose, a control mortar (SCRM-0) and two different mortars types, one with 10% LD (SCRM-10LD) and the other with 20% NP (SCRM-20NP) as cement replacements were prepared and tested according to EN 1504-3. The results of the experimental study showed that the produced repair materials fulfilled the performances requirements for structural repair products, class R4. In addition, the bond strength between the SCRMs and existing substrate concrete (SUBC), as assessed in this work by slant shear test on composite samples, showed that all tested samples have good bond strength at 28-days and the fractures were only occurred in the SUBC, which means that the substrate is the weakest link in the repair system

Highlights

I n the last decades, the number of houses in the developing countries has increased dramatically due to the increase in the average income
All a repair mortars were designed to satisfy the requirement of SCMS limits [24], which were obtained by adjusting the content of the SP
Based on the results presented in Tabs. 3 and Fig. 10, it can be concluded that using 10% limestone dust (LD) or 20% Natural Pozzolan (NP) are considered as suitable materials for use as cement replacement to produce self-compacting repair mortars, because all the repair materials developed in this study using LD and NP, meet the standards requirements for ACI [51]

Summary

Introduction

I n the last decades, the number of houses in the developing countries has increased dramatically due to the increase in the average income. The use of mineral admixtures in self-compacting mortars mix can improve rheological and mechanicals properties and durability. This promotes the valorization of other available local materials (natural, waste or by-products) which can be used as mineral additives for the production of repair materials Due to their high availability in Algeria, limestone dust (LD) and Natural Pozzolan (NP) could be successfully and economically used as mineral admixtures in self-compacting mortar production. The main goal of this research is to develop self-compacting repair mortars with available local materials such as limestone dust and natural pozzolan, and the study of the engineering properties behavior of the produced repair materials. The main goal of this research is to investigate the engineering properties behavior of self-compacting repair mortars made by the available local materials such as limestone dust and natural pozzolan

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