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http://hdl.handle.net/10397/96745
Title: | Tensile over-saturated cracking of Ultra-High-Strength Engineered Cementitious Composites (UHS-ECC) with artificial geopolymer aggregates | Authors: | Xu, LY Huang, BT Lao, JC Yao, J Li, VC Dai, JG |
Issue Date: | Feb-2023 | Source: | Cement and concrete composites, Feb. 2023, v.136, 104896 | Abstract: | Ultra-High-Strength Engineered Cementitious Composites (UHS-ECC) incorporating artificial geopolymer aggregates (GPA) were developed and over-saturated cracking (i.e., average tensile crack spacing smaller than the theoretical limit) was observed in this novel material. The developed UHS-ECC exhibited an ultra-high compressive strength (over 150 MPa) and an ultra-high tensile ductility (over 8%) simultaneously. The influences of GPA size on the matrix properties, tensile performance, micromechanics, and cracking behavior of UHS-ECC were systematically investigated. Over-saturated cracking and double-stage crack evolution (i.e., a bilinear relation between average crack width and tensile strain) were observed in UHS-ECC with GPA size smaller than 0.60 mm, while saturated cracking and single-stage crack evolution (i.e., a linear relation between average crack width and tensile strain) were observed in the other groups. Finally, the mechanism of over-saturated cracking and double-stage crack evolution was illustrated. The findings of this study extend the fundamental knowledge of ECC technology, which is meaningful for designing and developing UHS-ECC materials towards ultra-high tensile ductility. | Keywords: | Engineered Cementitious Composites (ECC) Strain-Hardening Cementitious Composites (SHCC) Ultra-high-performance concrete (UHPC) Geopolymer Alkali-activated material Artificial aggregate Multiple cracking |
Publisher: | Pergamon Press | Journal: | Cement and concrete composites | ISSN: | 0958-9465 | EISSN: | 1873-393X | DOI: | 10.1016/j.cemconcomp.2022.104896 |
Appears in Collections: | Journal/Magazine Article |
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