|Table of Contents|

Mechanical properties and microstructure of fiber reinforced geopolymer concrete(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2023年04期
Page:
12-23
Research Field:
建筑材料
Publishing date:

Info

Title:
Mechanical properties and microstructure of fiber reinforced geopolymer concrete
Author(s):
HUANG Hua1; 2;  GUO Mengxue1;  YU Jining3;  YANG Shilin1
(1. School of Civil & Architecture Engineering, Xi'an Technological University, Xi'an 710021, Shaanxi, China; 2. School of Civil Engineering, Chang'an University, Xi'an 710061, Shaanxi, China; 3. China Railway First Survey and Design Institute Group Co., Ltd., Xi'an 710043, Shaanxi, China)
Keywords:
geopolymer concrete;  fiber reinforcement;  mechanical property;  microstructure;  non-layered fiber;  layered fiber
PACS:
TU375.3
DOI:
10.19815/j.jace.2021.12014
Abstract:
To improve the poor ductility of geopolymer, fiber reinforced fly ash-slag geopolymer concrete with different fiber types, arrangement forms and volume content was prepared by using copper coated micro steel fiber and polypropylene fiber. The mechanical properties of geopolymer concrete were studied, and the fiber reinforcement mechanism with different arrangement forms was further explained based on scanning electron microscope. The results show that steel fiber and polypropylene fiber can effectively prevent the development of cracks in geopolymer concrete in the form of pull-out and fracture, respectively. The splitting tensile and flexural strength of non-layered reinforced geopolymer concrete samples with single steel fiber and hybrid fiber are significantly improved. The mechanical properties of layered fiber reinforced geopolymer concrete are equivalent to that of non-layered fiber reinforced geopolymer concrete, and the fiber content of the former is only about 40% of that of the latter. Different from the non-layered fiber reinforced mechanism, the double-layer steel fiber in the layered fiber reinforced geopolymer concrete is equivalent to the “double-layer elastic plate”. Besides the “bridging” effect of polypropylene fiber and steel fiber, it also intersects with the steel fiber around the matrix to form a network structure. The interaction between the steel fiber network structure limits the relative displacement of the fiber and significantly improves the mechanical properties of the sample.

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Last Update: 2023-07-01