Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 203, Issue -, Pages 525-540Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2019.01.121
Keywords
Geopolymer; Fiber reinforce; Glazed hollow beads; Polypropylene fiber
Categories
Funding
- National Natural Science Foundation of China [51502272]
- Natural Science Foundation of Zhejiang Province [LY19E080003]
- Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan) [G1323511668]
- Foundation from State Key Laboratory of Silicates Materials for Architectures of Wuhan University of Technology [SYSJJ2018-15]
- Foundation from Engineering Research Center of Nano-Geomaterials of Ministry of Education, China University of Geosciences [NGM2018KF011]
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In this work, fly ash and slag were used as aluminosilicate raw materials to prepare geopolymer paste, and different fibers and glazed hollow beads (GHB) were incorporated into the paste to produce various series of fiber reinforced geopolymer composites. The preparation process of geopolymer composites was explored and the optimum preparation conditions was obtained. Compressive strength, flexural strength, water absorption, porosity, thermal conductivity, linear shrinkage rate, microstructure and morphology have been characterized and assessed. Polypropylene fiber, alkali resistant glass fiber and lignin fibers were added to improve the cracking resistance and to enhance the strength. The results show that the optimal strength of fiber reinforced GHB blended geopolymer is obtained with 15% GHB addition, 0.75% fiber addition and liquid-solid ratio of 1.1. The improving effect of fibers on enhancing and anti shrinkage follows the following sequence: PP fiber, alkali resistant glass fiber and lignin fiber. It is also observed that the fiber not only prevents the separation of the GHB and geopolymer matrix, but also inhibits the generation and expansion of the cracks, and finally improves the strength regardless of hybrid fibers or single fiber. (C) 2019 Elsevier Ltd. All rights reserved.
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