Improvement of residual compressive strength and spalling resistance of high-strength RC columns subjected to fire

Han, Cheon-Goo; Han, Min Cheol; Heo, Young-Sun

doi:10.1016/j.conbuildmat.2008.01.011

Cited by 50 publications

(23 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…However, it is costly and time-consuming. Han et al (2005Han et al ( , 2009) proposed a small-scale test using a gas fire furnace. The standard size (100 mm diameter 3 200 mm high) concrete cylinders were placed in the gas fire furnace before testing.…”

Section: Spalling Test Methodsmentioning

confidence: 99%

Geopolymer and Portland cement concretes in simulated fire

Zhao

Sanjayan

2011

Magazine of Concrete Research

199

View full text Add to dashboard Cite

High-strength Portland cement concrete has a high risk of spalling in fire. Geopolymer, an environmentally friendly alternative to Portland cement, is purported to possess superior fire-resistant properties. However, the spalling behaviour of geopolymer concrete in fire is unreported. In this paper, geopolymer and Portland cement concretes of strengths from 40 to 100 MPa were exposed to rapid temperature rises, simulating fire exposures. Two simulated fire tests, namely rapid surface temperature rise exposure test and standard curve fire test, were conducted. In both types of test, no spalling was found in geopolymer concretes, whereas the companion Portland cement concrete exhibited spalling. This can be attributed to different pore structures of the two concretes. The sorptivity test found that geopolymer concrete had a significantly higher sorption, therefore more connected pores, than Portland cement concrete when compared at the same strength level. Hence, it is suggested that the water vapour can escape from the geopolymer matrix quicker than in Portland cement concrete, resulting in lower internal pore pressure. The paper concludes that, when compared at the same strength level, the geopolymer concrete possesses higher spalling resistance in a fire than Portland cement concrete due to its increased porosity.

show abstract

Section: Spalling Test Methodsmentioning

confidence: 99%

Geopolymer and Portland cement concretes in simulated fire

Zhao

Sanjayan

2011

Magazine of Concrete Research

199

View full text Add to dashboard Cite

show abstract

“…Gas fire furnace test using small cylinders has been previously used to predict spalling [12,13]. The concrete cylinders were placed in the gas furnace that was heated by a pre-set temperature versus time curve.…”

Section: Gas Fire Furnace Testmentioning

confidence: 99%

“…Although the full-scale testing is a reliable test method, it is costly and time consuming. Thus, some researchers [12,13] proposed a test method using small-scale specimens heated in a gas furnace, which is capable of the rapid temperature rise according to the standard fire curve. However, the key device in this method, the gas furnace is not commonly available in the majority of the laboratories.…”

Section: Introductionmentioning

confidence: 99%

Test method for concrete spalling using small electric furnace

Zhao

Sanjayan

2009

Fire and Materials

View full text Add to dashboard Cite

SUMMARYConcrete spalling can cause severe damage to concrete structure when exposed to fire. The spalling mechanisms are not very well understood. For the testing of spalling, full-scale structural members should be used, as spalling tests are sensitive to size effects. Full-scale testing in large furnace is costly and is not suitable for testing large number of concrete mixture trials. The standard and hydrocarbon fire time-temperature curves have rapid temperature rise during the initial phase. This temperature rise requires a gas furnace with high heating capacity and cannot be generated by electric muffle furnace commonly available in many laboratories.This paper presents a method to carry out spalling test in small-scale specimens with exposure to rapid temperature rise using a commonly available electric furnace in the laboratories. The tests are based on 150 mm diameter cylinders that are laterally confined to simulate full-scale structural members. The cylinder surface is exposed to rapid temperature rise by exposing through vertical and/or horizontal holes in pre-heated small electric furnace. Some unconfined 100 mm diameter cylinders were also exposed horizontally to test the performance of confinement. The paper shows that the hydrocarbon fire and standard fire exposure can be simulated by manipulating the exposure location of the surface of the concrete cylinder. Ordinary Portland cement concrete cylinders with different strengths were tested and different spalling patterns were observed. The spalling patterns matched the test results from a gas furnace fire test simulating the fire curves. The tests demonstrated that the method is an effective and convenient technique to predict the spalling risk of a concrete.

show abstract

“…The addition of polypropylene fibers can improve the resistance against explosive spalling [12][13][14]; however, there exists limitations because polypropylene fibers do not reduce temperature, may cause a decrease in strength of concrete [13,14] and are not possible for existing structures. Breaking through above limitations, the use of thermal barriers like fire retardant coatings can limit the extent of spalling as well [15]. To promote the application of HSC walls to high-rise buildings from the consideration of fire safety, Xiao et al [6] conducted a series of experiments about HSC walls after exposed to fire, revealing that polypropylene fibers remarkably improved the postfire seismic behavior of HSC shear walls.…”

Section: Introductionmentioning

confidence: 99%

“…When temperature exceeds 400°C, the residual compressive strength of HSC would remain about 30% of the strength at ambient temperature [11]. Worldwide scholars [12][13][14][15] attempted to reduce the possibility of explosive spalling. The addition of polypropylene fibers can improve the resistance against explosive spalling [12][13][14]; however, there exists limitations because polypropylene fibers do not reduce temperature, may cause a decrease in strength of concrete [13,14] and are not possible for existing structures.…”

Section: Introductionmentioning

confidence: 99%

Fire Resistance and Post-fire Seismic Behavior of High Strength Concrete Shear Walls

Xiao

Xie

et al. 2016

Fire Technol

View full text Add to dashboard Cite

In this study, both fire tests and low-frequency cyclic loading tests after fire were conducted on three conventional high strength concrete (HSC) shear walls and a superimposed HSC shear wall with precast recycled aggregate concrete (RAC) panels. The RAC in this paper was made with recycled concrete aggregate. When specimens suffered the fire exposure on one side for 45 min, 90 min, and 135 min separately, spalling of concrete, temperature distribution and deformation of specimens were investigated as indicators of fire response. When specimens were subjected to cyclic load after fire, hysteresis curves were obtained, based on which the secant stiffness degradation and energy dissipation capacity of walls were analyzed. The results indicated that HSC would suffer severe spalling during the fire and that fire response of the superimposed wall including spalling was smaller than that of conventional walls. Using RAC panel as a thermal barrier was found to be effective to alleviate spalling, as it reduced more than 60% of spalling of HSC compared with bare walls. Based on the seismic tests results, the fire exposure deteriorated the load bearing capacity, lateral stiffness and energy dissipation capacity of walls, whereas the application of RAC panels improved the load bearing capacity by about 10% even when the superimposed wall was exposed to the fire for a long time.

show abstract

Improvement of residual compressive strength and spalling resistance of high-strength RC columns subjected to fire

Cited by 50 publications

References 6 publications

Geopolymer and Portland cement concretes in simulated fire

Geopolymer and Portland cement concretes in simulated fire

Test method for concrete spalling using small electric furnace

Fire Resistance and Post-fire Seismic Behavior of High Strength Concrete Shear Walls

Contact Info

Product

Resources

About