Advances in Concrete Construction
Volume 21, Number 2, 2026, pages 165-188
DOI: 10.12989/acc.2026.21.2.165
Study on mechanical properties and microstructure of steel fiber reinforced geopolymer concrete
Yuting Deng , Rui Xie , Ge Tang , Hongbin Peng
Abstract
As one of the most important structural materials in the construction industry, concrete has long used Ordinary Portland Cement (OPC) as the main cementing material. However, the preparation process of cement has great problems of carbon emission and energy consumption, and a large amount of solid waste is attached, Cause serious environmental pollution. Obviously, the preparation of concrete with OPC no longer meets the requirements of "sustainable development". Therefore, the development of a new green material that can not only have the strength of cement but also can save energy and environmental protection is the current urgent need. In this paper, Mixed Coal gangue Geopolymer Concrete (MCGC) is prepared with coal gangue, fly ash and slag as raw materials. On this basis, steel fibers with different properties are selected. An experimental study on the mechanical properties of Steel Fiber reinforced Mixed Coal gangue Geopolymer Concrete (SFMCGC) was carried out, and the microstructure was analyzed by means of SEM and microhardness testing. To explore the toughening mechanism of SFMCGC, in this paper, it is found that the mechanical properties of MCGC are greatly improved by the three types of steel fibers. Through microscopic test analysis, it is found that the vertical and horizontal distribution of fibers plays a "bridge" effect, blocking the generation of micro cracks and the development of long cracks, and ensuring the integrity of the specimen. However, if the fiber content is too high, bubbles will be introduced to different degrees, which will affect the porosity and density of the specimen.
Key Words
geopolymer concrete; mechanical properties; microstructure; steel fiber; toughening mechanism
Address
- Yuting Deng — School of Architectural Engineering, Sichuan University of Arts and Science, Dazhou 635000, China
- Rui Xie — School of Intelligent Manufacturing, Sichuan University of Arts and Science, Dazhou 635000, China
- Ge Tang — Library, Sichuan University of Arts and Science, Dazhou 635000, China
- Hongbin Peng — School of Architectural Engineering, Sichuan University of Arts and Science, Dazhou 635000, China
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