Properties of Mortars Formulated from Self-Compacting High-Performance Concrete Containing Various Mineral Additions
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RESEARCH PAPER
Properties of Mortars Formulated from Self‑Compacting High‑Performance Concrete Containing Various Mineral Additions Muhammad Hanif Khan1 · Muhammad Ali Sikandar1 · Qaiser Jamal1 Received: 6 October 2019 / Accepted: 1 October 2020 © Shiraz University 2020
Abstract The present study illustrates the fresh, mechanical, and durability properties of fly ash (FA)-based mortars formulated from self-compacting high-performance concrete (SCHPC). The control mixture (C) contained ordinary Portland cement (OPC) and fly ash (FA) as the binders, while the remaining mixtures were ternary cementitious blends of OPC, FA, silica fume (SF), metakaolin (MK), and limestone powder (LP). The effect of limestone powder (LP), metakaolin (MK), and silica fume (SF) as cement replacement on the V-funnel flow, slump flow, compressive strength, flexural strength, rapid chloride penetration (RCPT), ultrasonic pulse velocity (UPV), electric resistivity (ER), dynamic elastic modulus (DEM), and alkali-silica reaction (ASR) is comparatively assessed for SCHPC-based mortars. The results indicate better performance of ternary mixes of SF and MK in terms of strength- and durability-related properties for mortars formulated from SCHPC. The FTIR spectroscopy and SEM analyses confirmed the improved performance of mortars containing SF and MK against ASR. Keywords SCHPC · Mortar · Compressive · ASR · FTIR · Mineral admixtures
1 Introduction Concrete is by far the most versatile and most widely used construction material worldwide. It can be engineered to meet a broad range of operation specifications, unlike other building materials, such as natural stone or steel, which generally have to be used as they are. During the last few years, a new trend is introduced in concrete as self-compacting concrete (SCC) possessing high performance called highperformance self-compacting concrete (SCHPC) (Safiuddin 2008). The SCHPC has the ability to easily flow and solidify under its own weight and fill the space between congested reinforcement in the formwork and maintain its proper composition throughout (Okamura and Ouchi 1998; The European guidelines for self-compacting concrete 2005; * Muhammad Ali Sikandar [email protected]; [email protected] Muhammad Hanif Khan [email protected] Qaiser Jamal [email protected] 1
Department of Civil Engineering, CECOS University of IT and Emerging Sciences, Peshawar, Pakistan
Guidelines for viscosity modifying admixtures for concrete 2006). As a result, the SCHPC has sufficient flow abilities like filling, passing, workability, and segregation resistance of SCC and high strength and good durability as that of high-performance concrete (HPC) (Le et al. 2015a, b). In order to achieve the desired properties of SCHPC, large quantities of chemical, as well as mineral admixtures, are used. It is due to economic and environmental reasons that the cement in SCHPC is partially replaced by cheaper supplementary cementitious materials (SCMs) like limestone powder (LP), fly ash (FA), marble pow
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