Explosive spalling potential of ultra-high performance concrete prepared by a novel approach

Author(s): Xu-Jing Niu, G.F. Peng, Ya-Jie Shang, Xi-Wang Chen, Hong Ding
Paper category: Proceedings
Book title: Proceedings of the International Conference on Sustainable Materials Systems and Structures (SMSS2019) Durability, Monitoring and Repair of Structures
Editor(s): Ana Baričević, Marija Jelčić Rukavina, Domagoj Damjanović, Maurizio Guadagnini
ISBN: 978-2-35158-217-6
e-ISBN: 978-2-35158-218-3
Publisher: RILEM Publications SARL
Publication year: 2019
Pages: 470-477
Total Pages: 848
Language: English

Abstract: An experimental investigation was conducted on combined curing as a novel approach to prepare ultra-high performance concrete (UHPC), which is composed of precuring in water and heating in dry air. The results indicate that the combined curing improves the mechanical properties of UHPC remarkably. More importantly, the combined curing is quite efficient to enhance the resistance of UHPC to explosive spalling under high temperature, which should be a novel approach to prohibit spalling occurrence, different from adding polypropylene fiber. Further hydration can be activated to form dense crystals including sheet-like tobermorite and needle-like xonotlite, while a large amount of internal free water has been consumed. The mechanism for the effect of the combined curing is that a dense microstructure forms while internal free water has been consumed.

Online publication :2019
Publication type : full_text
Public price (Euros) : 00