Effects of heating durations on normal concrete residual properties: compressive strength and mass loss

Global Congress on Construction, Material and Structural Engineering 2017

材料科学;土木建筑工程

Nazri, Fadzli Moham^1 ; Shahidan, Shahiron^2 ; Baharuddin, Nur Khaida^1 ; Beddu, Salmia^3 ; Abu Bakar, Badorul Hisyam^1

School of Civil Engineering Engineering Campus, Universiti Sains Malaysia, Nibong Tebal, Penang

14300, Malaysia^1

Jamilus Research Center, Faculty of Civil and Environmental Engineering, Universiti Tun Hussein Onn Malaysia, Pt Raja Johor

86400, Malaysia^2

Universiti Tenaga Nasional, Jalan IKRAM-UNITEN, Selangor, Kajang

43000, Malaysia^3

关键词: Compressive strength of concrete;    High temperature;    Hydration products;    Normal concretes;    Residual compressive strength;    Residual mass;    Residual properties;    Temperature-time curves;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/271/1/012013/pdf
DOI  :  10.1088/1757-899X/271/1/012013

来源: IOP

【 摘 要 】

This study investigates the effects of high temperature with five different heating durations on residual properties of 30 MPa normal concrete. Concrete cubes were being heated up to 600°C for 30, 60, 90, 120 and 150 minutes. The temperature will keep constant for 30, 60, 90, 120 and 150 minutes. The standard temperature-Time curve ISO 834 is referred to. After heating the specimen were left to cool in the furnace and removed. After cooling down to ambient temperature, the residual mass and residual compressive strength were observed. The obtained result shows that, the compressive strength of concrete decrease as the heating duration increases. This heating duration influence, might affects the loss of free water present and decomposition of hydration products in concrete. As the heating duration increases, the amount of water evaporated also increases led to loss in concrete mass. Conclusively, the percentage of mass and compressive strength loss increased as the heating duration increased.