Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 140, Issue -, Pages 139-149Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2017.02.093
Keywords
Fly ash cenosphere; Lightweight; Fiber-reinforced; Cement-based composites; Microstructure; Porosity; Sustainable development
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Funding
- China Ministry of Science and Technology under Grant (973 Program) [2015CB655104]
- Hong Kong Research Grants Council [615412]
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The objective of this research study is the in-depth evaluation of the characteristics of fiber reinforced cement-based composites containing fly ash cenospheres (FACs) as lightweight filler material. The resulting composites showed excellent mechanical properties with higher specific strength as 34.69-24.11 kPa/kgm(-3). The 28-day compressive, flexural and tensile strengths were determined in the range of 55.92-30.38 MPa, 9.29-5.38 MPa, and 3.51-1.66 MPa, respectively. The higher pozzolanic activity of FACs contributed towards the better mechanical properties even at lower density. Microstructural analyses of the composites were carried out by SEM, nitrogen adsorption, and mercury intrusion porosimetry (MIP) while TGA was used for phase identification and phase transformation studies, respectively. The results indicated that FAC is a promising material for producing strong and lightweight structural members for use in building construction which can promote sustainable development. However, excessive FACs content in the composite may lead to higher porosity due to hollow spherical shape and chemical composition of FAC particles which affects the mechanical behavior and durability of cement-based composite. (C) 2017 Elsevier Ltd. All rights reserved.
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