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Title: On the mechanism of prevention of explosive spalling in ultra-high performance concrete with polymer fibers
Authors: Zhang, Dong
Dasari, Aravind
Tan, Kang Hai
Keywords: Engineering::Civil engineering
Issue Date: 2018
Source: Zhang, D., Dasari, A., & Tan, K. H. (2018). On the mechanism of prevention of explosive spalling in ultra-high performance concrete with polymer fibers. Cement and Concrete Research, 113, 169-177. doi: 10.1016/j.cemconres.2018.08.012
Journal: Cement and Concrete Research
Abstract: It has been a common practice to use polymer fibers to reduce susceptibility of explosive spalling in ultra-high performance concrete (UHPC). However, to-date, despite the proposition of different mechanisms through which polymer fibers enhance gas permeability and reduce explosive spalling, there are many unanswered questions and unjustified claims on the proposed mechanisms. Therefore, the major emphasis of this work is to thoroughly re-examine and understand the exact role of polymer fibers in the prevention of explosive spalling of UHPC. A range of analytical and microscopic tools are used to realize this objective. It is concluded that melting of polymer fibers and creation of empty channels are not required for enhancing the permeability of gases or water vapor through concrete. In fact, it is the thermal mismatch between embedded fibers and matrix that is critical in obtaining an interconnected network of cracks in the matrix. This occurs even before melting of polypropylene (PP) fibers. The network of cracks is responsible for enhancing permeability, thereby reducing the susceptibility of explosive spalling of UHPC.
ISSN: 0008-8846
DOI: 10.1016/j.cemconres.2018.08.012
Rights: © 2018 Elsevier Ltd. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:MSE Journal Articles

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