NDLI: An experimental investigation of the thermal spalling of polypropylene-fibered reactive powder concrete exposed to elevated temperatures

Content Provider	Springer Nature Link
Author	Ju, Yang Wang, Li Liu, Hongbin Tian, Kaipei
Copyright Year	2015
Abstract	Polypropylene fibers are embedded to prevent reactive powder concrete (RPC) from spalling failure under high temperatures. This paper probes the influence of embedded fibers at various volumetric dosages on the thermomechanical properties of polypropylene-fibered reactive powder concrete (PPRPC) exposed to high temperatures up to 350 °C and on the spalling performance and characteristics up to 600 °C. The thermomechanical properties include the characteristic temperature for spalling, and residual strengths, such as the compressive strength, split tensile strength, and flexural tensile strength. A high-definition charge-coupled device camera and scanning electron microscope technology were employed to capture the spalling processes and to detect the microstructural changes in the materials with various fiber dosages. To understand and characterize the mechanism by which polypropylene fibers influence the thermal spalling of RPC, a numerical model to determine the moisture migration and vapor pressure transmission during spalling was developed in this paper. It showed that there was an optimal volumetric dosage of fibers to prevent PPRPC from explosive spalling. The relationships between the mechanical characteristics of PPRPC and the fiber dosages were derived based on experimental data.聚丙烯纤维可用于改善活性粉末混凝土(RPC)的高温爆裂,本文实验研究了不同掺量聚丙烯纤维对活性粉末混凝土热物理力学性质以及高温爆裂特征的影响,测试并分析了聚丙烯RPC的抗压、劈裂和弯折强度随温度和纤维掺量的变化规律;利用自主研制的高温实验装置及高清摄像机观测了聚丙烯RPC高温爆裂的全过程,获取了起止温度、持续时间等爆裂特征。利用SEM分析了聚丙烯纤维熔化前后的微观结构变化及其对内部蒸汽压作用的影响,结合内部蒸汽压和含湿量的数值计算, 定量分析了RPC爆裂破坏的蒸汽压机理。实验发现:改善聚丙烯RPC高温力学性能和缓解其爆裂破坏的聚丙烯纤维最优掺量为0.9 %。
Starting Page	2022
Ending Page	2040
Page Count	19
File Format	PDF
ISSN	20959273
Journal	Chinese Science Bulletin
Volume Number	60
Issue Number	23
e-ISSN	20959281
Language	Chinese
Publisher	Science China Press
Publisher Date	2015-11-18
Publisher Place	Beijing
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Polypropylene reactive powder concrete (PPRPC) Thermal spalling Vapor pressure mechanism Polypropylene fibers Elevated temperatures Science Life Sciences Physics Chemistry/Food Science Earth Sciences Engineering
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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