Study on spatial deformation mechanism of fiber-EPS optimized geopolymer cemented aeolian sand (GCAS)
Geopolymer cemented aeolian sand and other Controlled Low Strength Materials (CLSM) are classified as quasi-brittle materials, as their distinct brittleness upon failure severely limits their usage scope. To optimize the compressive deformation mechanism of geopolymer cemented aeolian sand, this stu...
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| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-09-01
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| Series: | Results in Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2590123025022893 |
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| Summary: | Geopolymer cemented aeolian sand and other Controlled Low Strength Materials (CLSM) are classified as quasi-brittle materials, as their distinct brittleness upon failure severely limits their usage scope. To optimize the compressive deformation mechanism of geopolymer cemented aeolian sand, this study incorporates an appropriate number of polypropylene fibers and EPS particles into the geopolymer cemented aeolian sand, preparation of fiber -EPS- geopolymer cemented aeolian sand (F-EPS-GCAS). Techniques such as unconfined compressive testing, discrete element numerical simulation, and electron microscopy scanning are utilized to elucidate the synergistic optimization of spatial deformation mechanisms by fibers and EPS. The research findings demonstrate that: (1) With an increase in fiber content, the 28d UCS of F-EPS-GCAS is maximized (3.45 MPa) and the elastic modulus is minimized (0.4168 GPa) at a fiber content of 5 ‰. There is a negative correlation between EPS content and the 28d UCS and elastic modulus of F-EPS-GCAS. (2) As EPS content increases, the failure mode of F-EPS-GCAS shifts from ''abrupt main crack failure'' to ''gradual micro-crack damage.'' (3) Aluminosilicate gel adheres to the fiber surface, forming a ''nano-scale mortise-and-tenon structure,'' presenting a multi-stage failure of ''gel layer fracture-fiber slip-fiber fracture'' during failure. The study shows that fibers and EPS synergistically form a ''rigid-flexible coupling structure,'' significantly enhancing the failure ductility of geopolymer cemented aeolian sand through a ''bridge-crack hindering-flexible energy absorption-multi-crack dispersion'' synergy mechanism. The research results provide theoretical support for broadening the application scope of CLSM. |
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| ISSN: | 2590-1230 |