International Journal of Applied Science and Engineering https://doi.org/10.6703/IJASE.202109_18(5).018 Vol.18(5) 2020339 OPEN ACCESS Received: December 28, 2020 Revised: April 25, 2021 Accepted: July 21, 2021 Corresponding Author: M Talha Junaid [email protected] Copyright: The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted distribution provided the original author and source are cited. Publisher: Chaoyang University of Technology ISSN: 1727-2394 (Print) ISSN: 1727-7841 (Online) Investigation on the properties of ambient cured alkali activated binder concrete M Talha Junaid 1* , Abdul Saboor Karzad 1# , Moussa Leblouba 1 1 Department of Civil & Environmental Engineering, College of Engineering, University of Sharjah, Sharjah, P. O. Box 27272, UAE # Present Address: Department of Civil Engineering, College of Engineering, American University of Sharjah, Sharjah, P. O. Box 26666, UAE ABSTRACT This research paper reports results of strength development properties of ambient- cured alkali activated binders (AABs) and their reliance on different parameters, such as type of pre-cursor materials & their proportions, type & ratio of activators, and curing age. In this research study sodium silicate (SS) and sodium hydroxide (SH) solutions were used to activate a blend of low-calcium (class F) fly ash (FA) and ground granulated blast furnace slag (GGBFS). A total of 25 AABs mixes with various mix proportions are investigated in this research study. The results indicate that AABs can be manufactured with strength properties similar to ordinary Portland cement concrete (OPC). For further insight into the mechanical property variations of these samples SEM and EDS tests are conducted and their micrographs are presented here. A previously proposed analytical model to predict the compressive stress-strain response of these AABs is also modified in this study to better capture their post peak behaviour. Keywords: Alkali activated binder, Elastic modulus, Compressive strength, Flexural strength, Stress-strain, SEM, EDS. 1. INTRODUCTION Concrete is a commonly used construction material for structure and infrastructure development and the most widely used material second only to water. Therefore, the yearly global production of cement being the main binder of concrete, will only increase due to high demand of infrastructure growth (Davidovits, 1994; US Geological-Survey, 2013; Shehab et al., 2016). The production of cement not only adds 7% of the total man- made greenhouse gas emission (CO2) to the atmosphere but also produces some other environmentally hazardous material such as SO3 and NOx (Malhotra, 2002; McCaffrey, 2002; Fernández-jiménez, 2006; Lloyd and Rangan, 2010; Shehab et al., 2016). CO2 emissions resulting from OPC production can be divided into two halves: one coming from calcination of limestone while the other one is due to the fossil fuel combustion for the kiln (Hardjito et al., 2008). To tackle the increase of these environmentally harmful products due to production of Portland cement (PC), alternative pozzolanic materials like metakaolin, fly ash, silica fume, GGBFS, and rice husk ash have been used as cement replacement (Ganesh and Muthukannan, 2018). These pozzolanic materials have made some impact on the carbon footprint of cement, however, this has been rather limited. More recently, researchers have focused on development of binders that do not uses Portland cement in full (Hassan et al., 2019; Ahmed et al., 2021; Shrivas et al., 2021). Alkali activated binders (AABs) are one such group of binders that have come to the forefront as a possible replacement for OPC. AABs are formed by activating silica (SiO2) and alumina (Al2O3) rich industrial by-products using a strong metallic alkaline solution. (Davidovits and Orlinski, 1988; Davidovits, 1991; Lloyd and Rangan, 2010; Topark-Ngarm et al., 2015).
Investigation on the properties of ambient cured alkali activated binder concrete
May 03, 2023
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