The Open Civil Engineering Journal




ISSN: 1874-1495 ― Volume 14, 2020
RESEARCH ARTICLE

Evaluation of Concrete Quality for Reinforced Concrete Frame Members Exposed to Natural Fires at Early Ages Using in situ Test Methods



Muhammad I. Omer1, *, Dilshad K. Jaf 1
1 Department of Civil Engineering, Salahaddin University, Erbil, Iraq

Abstract

Background:

In recent years, numerous reinforced concrete buildings have been constructed in Iraq and some developing countries. Fire accidents occur in wooden formwork especially during the summer season due to problems associated with the construction procedure and on-site management. And fires can erupt during the construction stage of buildings.

Introduction:

Generally, if fire accidents occur in a wooden formwork, in these situations the concrete in the field is at an early age (i.e., “young”). The internal structure and chemical composition of early-age concrete are different from that of the carrier due to incomplete hydration at an early age. This study aimed to evaluate the strength of reinforced concrete frames at early ages when exposed to natural fire. The evaluation of existing buildings is an important issue that involves researchers and engineers in many countries.

Methods:

The experimental program consisted of constructing three full-scale reinforced concrete frames that are then exposed to natural fire. When the concrete age reaches three and five days by firing its formwork, the concrete quality of the structure was evaluated via ultrasonic pulse velocity as a nondestructive measurement. Core test was used as a destructive technique to implement a relationship between compressive strength and nondestructive measurements.

Results:

The results showed that the frame exposed to natural fire early was generally more affected than the other frame, and its compressive strength was reduced close to 33%. The results also showed that the ultrasonic pulse velocity test for the structural elements was smaller than those of the core test.

Conclusion:

It can be concluded that the current assessment methodology must be evaluated to provide practical suggestions that can enhance the reliability of assessing the in situ strength of existing concrete structures by nondestructive tests and cores.

Keywords: Evaluation, Concrete quality, Reinforced concrete structures, Natural fire, Early ages, In situ test methods.


Article Information


Identifiers and Pagination:

Year: 2019
Volume: 13
First Page: 201
Last Page: 209
Publisher Id: TOCIEJ-13-201
DOI: 10.2174/1874149501913010201

Article History:

Received Date: 30/08/2019
Revision Received Date: 15/10/2019
Acceptance Date: 2/11/2019
Electronic publication date: 31/12/2019

© 2019 Omer and Jaf

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.


* Address correspondence to this author at Department of Civil Engineering, Salahaddin University, Erbil, Iraq; Tel: 009647504521812;
E-mail: muhammad.omer@su.edu.krd




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