Microstructure and compressive strength of self-compacting concrete incorporating palm oil fuel ash exposed to elevated temperatures

被引：25

作者：

Mujedu, Kasali Adebayo ^{[1
,2
]}

Ab-Kadir, Mariyana Aida ^{[1
]}

Sarbini, Noor Nabilah ^{[1
]}

Ismail, Mohammad ^{[1
]}

机构：

[1] Univ Teknol Malaysia, Sch Civil Engn, Fac Engn, Utm Johor Bahru 81310, Johor, Malaysia

[2] Fed Polytech, Fac Engn Technol, Dept Civil Engn, Ede, Osun State, Netherlands

来源：

CONSTRUCTION AND BUILDING MATERIALS | 2021年 / 274卷

关键词：

Palm oil fuel ash; Elevated temperature; Self-compacting concrete; Mass loss; Residual compressive strength; Microstructures; SUPPLEMENTARY CEMENTITIOUS MATERIAL; BLAST-FURNACE SLAG; FRESH PROPERTIES; BLENDED CEMENT; FLY-ASH; CONSOLIDATING CONCRETE; PERFORMANCE; HEAT;

D O I：

10.1016/j.conbuildmat.2020.122025

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Palm oil fuel ash (POFA) has been extensively used to substitute cement in the production of self-compacting concrete (SCC) to lessen its production cost, health hazard, energy consumption problems and environmental pollution caused during the production of cement. Nevertheless, the impact of elevated temperatures on self-compacting concrete produced with POFA (POFA-SCC) has not been studied extensively. When designing the fire resistance of concrete at elevated temperatures, its compressive strength is of primary interest. This research endeavor is carried out to study the impact of elevated temperatures on the microstructure and compressive strength of SCC produced from POFA with 15% replacement level by weight of cement. The 28 days compressive strength of SCC samples was determined using concrete cubes. Subsequently, the SCC samples were subjected to elevated temperatures which varying from 200 to 1000 degrees C at an intermission of 200 degrees C utilizing an automatic regulated electric furnace for duration of 120 min after reaching the requisite temperatures. After heating, mass losses and compressive strength were evaluated. The microstructures of SCC were also examined by scanning electron microscope and X-ray diffraction analysis. Results revealed that there was an incessant loss in mass of the cubes with upsurge in temperature. There was an upsurge in the values of compressive strength at 400 degrees C whereas it fluctuated sharply at the range of 400-600 degrees C, 600-800 degrees C and 800-1000 degrees C for the two mixes. The results of the microstructures showed the transformation of calcium silicate hydrate (C-S-H) into distinctive phases. The outcome of this research will be applicable in high fire resistance structures and also help to minimize the waste from palm oil factory. (C) 2020 Elsevier Ltd. All rights reserved.

引用

页数：11

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