Issue 45

A. Benyahia et alii, Frattura ed Integrità Strutturale, 45 (2018) 135-146; DOI: 10.3221/IGF-ESIS.45.11 135 Influence of limestone dust and natural pozzolan on engineering properties of self-compacting repair mortars Amar Benyahia, Said Choucha, Mohamed Ghrici Geomaterials Laboratory, Hassiba Benbouali University of Chlef, Algeria a.benyahia@univ-chlef.dz , said_choual@hotmail.fr , m.ghrici@univ-chlef.dz Ahmed Omran Department of Civil Engineering, University of Sherbrooke, Canada a.omran@usherbrooke.ca A BSTRACT . The main goal of this work is to develop self-compacting repair mortars (SCRMs) containing limestone dust (LD) and Natural Pozzolan (NP). Therefore, a three different mortar ( SCRM0 , SCRM-10LD and SCRM-20NP) 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, complete composite specimens for the slant shear, showed a good bond strength between the SCRMs and existing substrate concrete (SUBC) 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. K EYWORDS . Self-compacting mortar; Limestone dust; Natural pozzolan; Composite; Bond strength; Repair. Citation: Benyahia, A., Choucha, S., Ghrici, C.., Omran, A., Influence of limestone dust and natural pozzolan on engineering properties of self-compacting repair mortars, Frattura ed Integrità Strutturale, 45 (2018) 135-146. Received: 05.02.2018 Accepted: 07.06.2018 Published: 01.07.2018 Copyright: © 2018 This is an open access article under the terms of the CC-BY 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. I NTRODUCTION n the last decades, the number of houses in the developing countries has increased dramatically due to the increase in the average income. These structures should be preserved in good conditions for longer life spans by carrying out periodical maintenance and rehabilitation. If the structures are made of concrete, high quality of care should be given, because concrete deterioration can be caused by a variety of factors, including natural hazards, climate changes, overloading, etc. These conditions could result in corrosion, cracking, local damages, or in extreme cases which can all lead to concrete failure However a crack maybe the first sign of a serious defect which may affect the serviceability or the stability of the building [1]. The cracks can be prohibited or at least minimized by the inclusion of fibers in the cementitious matrix. Fibers can improve several mechanical properties of the hardened mortar such as post-cracking response, toughness, flexural strength and ductility; they can also reduce the water permeability and the creep [2]. Currently, there are a large variety of I