Effects of Fiber Types on Mechanical Properties and Microstructure of Engineered Cementitious Composites

doi:10.16552/j.cnki.issn1001-1625.2024.1388

Abstract

Abstract: To investigate the reinforcement mechanism of different fibers on engineered cementitious composites (ECC), the in-situ manufactured sand from a certain project site and three types of fibers (polyvinyl alcohol (PVA), polypropylene (PP) and polyethylene (PE)) were used to prepare ECC. The mechanical properties and microstructure of ECC prepared by PVA fibers, PP fibers and PE fibers were compared with the matrix. The distribution pattern of ECC bending cracks was characterized by digital image processing technology. The results show that the incorporation of fibers results in a reduction in the compressive strength of the matrix. Among them, the reduction in compressive strength is smallest for polyethylene PE fibers. The 28 d compressive strength of ECC prepared by PE fibers (E-PE) is 52.5 MPa. In terms of flexural performance, the flexural toughness and ultimate deflection of ECC are enhanced compared to the matrix. E-PE exhibits the best flexural performance, its peak load and ultimate deflection are 5.51 kN and 3.40 mm. With the increase of flexural deflection, the bending crack length and crack area of ECC increase. The crack area of E-PE is only 40.455 9 mm² when the deflection is 3.0 mm. Distinct failure mechanisms are observed for different fibers. PVA and PP fibers exhibit pullout failure, while the specimens exhibit single crack toughness failure. PE fibers show a combination of pullout and breakage, its specimen shows multi point cracking failure mode.

Key words: ECC, mechanical sand, fiber, digital image processing, crack, enhancement mechanism, failure mode

CLC Number:

TU528

HAO Rusheng, HU Wei, HE Jingjing, WU Wenbo, LU Haodan, ZHANG Wei. Effects of Fiber Types on Mechanical Properties and Microstructure of Engineered Cementitious Composites[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(7): 2396-2405.

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