Residual strength of concrete containing recycled materials after exposure to fire: A review

Cree, Duncan; Green, Mark F.; Noumowé, Albert

doi:10.1016/j.conbuildmat.2013.04.005

Cited by 149 publications

(70 citation statements)

References 60 publications

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“…Through observations after fire exposure, Sarhat and Sherwood [22] found that thermal cracks in cylinders appeared consistently to be shallower and narrower as the replacement percentage of recycled concrete aggregates increased, and that no RAC cylinder experienced spalling whereas the cylinders with natural aggregates suffered spalling. In other experimental studies [23,24], no explosive spalling of RAC was observed either, as it is also concluded by Cree et al [25] through a literature review. These findings indicate that RAC possesses a relatively good resistance of explosive spalling.…”

Section: Fire Technology 2016supporting

confidence: 65%

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

Xiao

Xie

et al. 2016

Fire Technol

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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.

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Section: Fire Technology 2016supporting

confidence: 65%

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

Xiao

Xie

et al. 2016

Fire Technol

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“…To date sustainable concrete with coarse RCA has received limited attention for mechanical properties post-fire (heated, cooled, and then loaded at-ambient temperature) as was provided in a recent review of recycled materials for use in concrete [14]. For example, an earlier work [15] studied the residual compression strength of concrete prepared with natural coarse granite aggregates and concrete containing 75% by volume of coarse RCA.…”

Section: Introductionmentioning

confidence: 97%

Fire Performance of Sustainable Recycled Concrete Aggregates: Mechanical Properties at Elevated Temperatures and Current Research Needs

et al. 2015

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The materials used for the construction of buildings are changing. There are now many sustainability drivers for developing novel green construction materials. An emerging material used for building construction is concrete with conventional coarse aggregates substituted as recycled concrete aggregates (RCA). This is a form of sustainable concrete. A finite number of buildings (>10) with this material have been constructed in North America, Europe and Asia. However; to help facilitate wide spread use and development of sustainable concrete with RCA, there is purpose in considering this material's at-elevated temperature (in-fire) mechanical properties. To date, this topic has seen limited research attention as it is difficult to study. The study herein considered the mechanical properties of conventional and sustainable concrete with RCA. The only difference between the conventional and the sustainable concrete mixes was the mass proportion of a conventional natural coarse aggregate, Limestone, which had been substituted with coarse RCA (at replacement proportions of 0%, 30% and 100%). Both the ambient and elevated temperature mechanical properties were considered with compressive mechanical tests using an innovative optical technology for strain measurement. Based on the analysis performed, a proportional decrease in retained strength and elasticity of concrete at-elevated temperature with increasing RCA content was observed. For example both mechanical properties showed a 0.2% decrease in retained value for every 1% RCA increase at 500°C. In addition the modelling parameter of Poisson ratio appeared to be influenced by the heat imposed and the aggregate type contained within the concrete. For example at 500°C, this parameter showed an 73% increase for concrete samples with only Limestone aggregate and a 15% decrease for samples with only RCA (of mixed origin primarily Siliceous). This paper concludes with highlighting current knowledge gaps and research needs that when addressed could help improve the facilitation of using sustainable concrete's with RCA in construction of buildings.

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“…Viera et al [38], who did not find a correlation of residual mechanical properties with replacement ratios of coarse RA in concretes, reported that after the exposure to 400ºC, 600ºC, and 800 ºC, the compressive strength of conventional concrete and concrete made with 100% RCA decreased with the same magnitude. According to Cree et al [39], coarse RCA in concrete had a better residual strength than that of the conventional concrete for temperatures ranging from 500ºC to 700ºC.…”

Section: Introductionmentioning

confidence: 98%

Residue strength, water absorption and pore size distributions of recycled aggregate concrete after exposure to elevated temperatures

Kou

Poon

Etxeberria

2014

Cement and Concrete Composites

116

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Residual strength of concrete containing recycled materials after exposure to fire: A review

Cited by 149 publications

References 60 publications

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

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

Fire Performance of Sustainable Recycled Concrete Aggregates: Mechanical Properties at Elevated Temperatures and Current Research Needs

Residue strength, water absorption and pore size distributions of recycled aggregate concrete after exposure to elevated temperatures

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