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Materials 2019, 12(6), 858; https://doi.org/10.3390/ma12060858

Using Green Supplementary Materials to Achieve More Ductile ECC

1
Department of Disaster Mitigation for Structures, College of Civil Engineering, Tongji University, Shanghai 200092, China
2
Key Laboratory of New Technology for Construction of Cities in Mountain Area (Chongqing University), Ministry of Education, Chongqing 400045, China
3
Key Laboratory of Performance Evolution and Control for Engineering Structures of Ministry of Education, Tongji University, 1239 Siping Road, Shanghai 200092, China
4
State Key Laboratory of Disaster Reduction in Civil Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China
5
Shanghai Key laboratory of engineering structure safety, Shanghai 200032, China
*
Authors to whom correspondence should be addressed.
Received: 22 February 2019 / Revised: 10 March 2019 / Accepted: 11 March 2019 / Published: 14 March 2019
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Abstract

To improve the greenness and deformability of engineered cementitious composites (ECC), recycled powder (RP) from construction and demolition waste with an average size of 45 μm and crumb rubber (CR) of two particle sizes (40CR and 80CR) were used as supplements in the mix. In the present study, fly ash and silica sand used in ECC were replaced by RP (50% and 100% by weight) and CR (13% and 30% by weight), respectively. The tension test and compression test demonstrated that RP and CR incorporation has a positive effect on the deformability of ECC, especially on the tensile strain capacity. The highest tensile strain capacity was up to 12%, which is almost 3 times that of the average ECC. The fiber bridging capacity obtained from a single crack tension test and the matrix fracture toughness obtained from 3-point bending were used to analyze the influence of RP and CR at the meso-scale. It is indicated that the replacement of sand by CR lowers the matrix fracture toughness without decreasing the fiber bridging capacity. Accordingly, an explanation was achieved for the exceeding deformability of ECC incorporated with RP and CR based on the pseudo-strain hardening (PSH) index. View Full-Text
Keywords: green engineered cementitious composites; recycled powder; crumb rubber; strain hardening; ultra-high ductility green engineered cementitious composites; recycled powder; crumb rubber; strain hardening; ultra-high ductility
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Wang, Y.; Zhang, Z.; Yu, J.; Xiao, J.; Xu, Q. Using Green Supplementary Materials to Achieve More Ductile ECC. Materials 2019, 12, 858.

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