|Table of Contents|

Progress of Study on Explosive Spalling of High Performance Concrete at Elevated Temperatures(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2019年03期
Page:
1-15
Research Field:
Publishing date:

Info

Title:
Progress of Study on Explosive Spalling of High Performance Concrete at Elevated Temperatures
Author(s):
XIAO Jian-zhuang1;  LIU Liang-lin1;  DONG Yu-li2;  LUO Fa-jiang3;  GAO Wan-yang1
(1. College of Civil Engineering, Tongji University, Shanghai 200092, China; 2. College of Civil Engineering, Huaqiao University, Xiamen 361021, Fujian, China; 3. China Construction Third Engineering Bureau Co., Ltd., Wuhan 430074, Hubei, China)
Keywords:
high performance concrete;  mechanism of explosive spalling;  influence factor;  inhibition for explosive spalling;  elevated temperature
PACS:
TU375
DOI:
-
Abstract:
Based on the extensive use of high performance concrete(HPC)and the danger of fire, researches on HPC explosive spalling at elevated temperatures or fire were classified and summarized, both at home and abroad. The sorting of HPC explosive spalling was focused on three aspects: mechanism, influence factor, inhibition. The results show that the current theories cannot fully explain HPC explosive spalling under elevated temperature or fire, but there is a common point that the explosive spalling is the interaction of thermal pressure and vapor stress and tensile strength of concrete. Many factors can induce the explosive spalling, therefore, it is necessary to continue a further study on the method of calculating the pore pressure as the basic factor. Inhibition measures for explosive spalling are numerous and effective. As a single addition to HPC, the amount of polypropylene fiber(PPF)or steel fiber can be predicted differently by regression expressions. The relationship of the hybrid ratio is not reported when PPF and SF are mixed, and the PPF is the recommended addition to the high strength concrete after comprehensive comparison and analysis. Aiming to the new, existing high performance concrete structure and the ultra-high performance concrete, the design of explosive spalling is introduced to represent inhibition measures for the explosive spalling, which will be beneficial to bring about the inhibition effect in the initial stage of building design. For the high performance concrete structures with admixture for inhibition for explosive spalling, it is suggested that the further work should focus on mechanical behaviors of the structure under or after fire. But to the structure with external coating or posting measures for inhibition for explosive spalling, it is necessary to get further study and improve on the assembled and disassembled techniques and standardization constructions.

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Last Update: 2019-05-23