Influence of mineral admixtures on the residual mechanical properties and durability characteristics of self-compacting concrete subjected to high temperature

IF 1.6 Q3 ENGINEERING, CIVIL Australian Journal of Civil Engineering Pub Date : 2021-07-21 DOI:10.1080/14488353.2021.1953682
T. Kiran, M. E. Mathews, A. N, U. J. Alengaram, A. Andrushia
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引用次数: 9

Abstract

ABSTRACT Structural engineers must be cautious about fire accidents in buildings, as a result critical deterioration occurs in the strength and serviceability of concrete structures. Self-Compacting Concrete (SCC) is an efficient material developed using Supplementary Cementitious Materials (SCM). This research intends to evaluate the effect of mineral admixtures such as Metakaolin (MK), Silica Fume (SF) and Fly Ash (FA) on the mechanical and durability characteristics of SCC exposed to elevated temperature. Two SCC mixes satisfying the European Federation of National Associations Representing for Concrete (EFNARC, 2005) workability stipulations developed to achieve 20MPa and 50MPa. The specimens were exposed to elevated temperatures following the ISO 834 standard fire curve. Compressive strength, water absorption, acid resistance and Rapid Chloride Penetration Test (RCPT) tests were carried out on heat-affected SCC specimens exposed to elevated temperature. A reduction in strength of 48% and 64% were obtained for the M20 and M50 grade SCC specimens, respectively.
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矿物掺合料对高温自密实混凝土残余力学性能和耐久性的影响
摘要结构工程师必须小心建筑火灾事故,因为火灾会导致混凝土结构的强度和可用性严重恶化。自密实混凝土(SCC)是利用补充胶凝材料(SCM)开发的一种高效材料。本研究旨在评估偏高岭土(MK)、硅灰(SF)和粉煤灰(FA)等矿物掺合料对高温SCC力学和耐久性特性的影响。两种SCC混合料满足欧洲混凝土代表协会联合会(EFNARC,2005)的和易性规定,分别达到20MPa和50MPa。根据ISO 834标准火灾曲线,将试样暴露在高温下。对暴露于高温下的热影响SCC试样进行了抗压强度、吸水性、耐酸性和快速氯离子渗透试验(RCPT)。M20和M50级SCC试样的强度分别降低了48%和64%。
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CiteScore
3.90
自引率
7.70%
发文量
31
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