Behavior of MK-based Geopolymer Concrete Circular Columns Exposed to Fire

Nibras. N. Khalid; Wissam K. Al-Saraj; Hanadi F. Naji

doi:10.6180/jase.202102_24(1).0012

Behavior of MK-based Geopolymer Concrete Circular Columns Exposed to Fire

Nibras N. Khalid This email address is being protected from spambots. You need JavaScript enabled to view it.¹ , Wissam K. Al-Saraj¹ , and Hanadi F. Naji¹

¹Civil Engineering Department ,Mustansiriyah University, Baghdad, Iraq

Received: August 22, 2020
Accepted: September 8, 2020
Publication Date: February 1, 2021

Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.

Download Citation: ||https://doi.org/10.6180/jase.202102_24(1).0012

ABSTRACT

The design of the construction buildings should consider the fire resistance of the structural members to reduce the risks of fire exposure. Geopolymer is a promising material that can be used in construction for its desired properties including strength and sustainability. The performance of the MK-based geoploymer concrete columns exposed to fire was investigated and presented in this paper. The columns are short of one meter in length and circular cross section of diameter 150 mm. Twelve columns were tested under axial concentrated loads. The parameters considered as variables of the experimental work are the duration of fire exposure and the cover thickness (15, 25, 35 mm). The experimental results showed that there is an enhancement in the load carrying capacity of the columns subjected to fire for low level of fire about 12 % of the initial strength of the column with the largest thickness. At the highest fire period, the columns experienced loss in strength especially the specimen of the smallest cover thickness by 28 % of its original strength. The reduction in strength is attributed to the cover spalling resulted from the damage caused by fire. However, MK-based GC columns have better performance of cement based RC columns under fire.

Keywords: Circular Column, Cover Thickness, Geopolymer, Fire Resistance, Metakaolin

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