Experimental study of mechanical properties of normal-strength concrete exposed to high temperatures at an early age

Chen, Bing; Li, Chunling; Chen, Longzhu

doi:10.1016/j.firesaf.2009.06.007

Cited by 100 publications

(59 citation statements)

References 20 publications

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“…The proportion of RCA was chosen on the following basis: 0% RCA-the conventional concrete with pure Limestone aggregate. This mix was meant as the control; 30% RCA-when no other changes to the mix design were made, the mechanical effects of RCA substitution up to 30% were accepted to be relatively small (see [29][30][31]); and 100% RCA-pure RCA substitution as coarse aggregate was defined to represent an extreme condition of aggregate substitution as can be seen in real construction.…”

Section: Experimental Methodologymentioning

confidence: 99%

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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Section: Experimental Methodologymentioning

confidence: 99%

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

et al. 2015

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“…In reinforced concrete members, such changes are reflected by a reduction in the mechanical properties, increase in the permeability of concrete, and weakening of the bond strength between embedded steel and concrete [10][11][12]. Many studies have been carried out to investigate the effect of the elevated temperature on different concrete specimens [13][14][15]. It is noted that characteristics such as colour, compressive strength, elasticity, concrete density and surface appearance are affected by temperature [16,17].…”

Section: Introductionmentioning

confidence: 99%

Effect of elevated temperature on the compressive strength of concrete produced with pulverized steel mill scale

Oyelade¹,

Odegbaro²,

Fapohunda³

2018

Nig. J. Tech.

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Concrete materials in structures are usually exposed to high temperatures during fire. The relative properties of concrete after such an exposure are of great importance in terms of the serviceability of buildings. The effect of partial replacement of cement with pulverized steel mill scale (PSMS) on the compressive strength of concrete cubes was investigated in the first test. Furthermore, the influence of elevated temperatures on the compressive strength of the concrete cubes with cement partially replaced with PSMS was examined. For the second test the cubes were exposed to elevated temperatures ranging from the ambient temperature to 750°C in steps of 250°C for 2 hours and allowed to cool for 24 hours. Based on results of tests, partial replacement of cement with 10 % PSMS is recommended for use in concrete production and resistance to elevated temperature. The studies show that at this replacement, the concrete compressive strength is not adversely affected when the elevated temperature reaches 500°C.

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“…The compressive strength increase compared to the initial values for the RM samples is 16%, and, for concrete containing CB and CT aggregates, the increase is between 2%–6%. According to [21,22,23], the compressive strength increase is caused by chemical changes in the cement paste. A loss of humidity occurs, due to which interparticle forces between hydration products increase, which subsequently leads to an increase in compressive strength.…”

Section: Resultsmentioning

confidence: 99%

“…A loss of humidity occurs, due to which interparticle forces between hydration products increase, which subsequently leads to an increase in compressive strength. Another increase in compressive strength is presumably a shorter high temperature exposure for 200 °C compared to the duration of exposure at 600 °C, which also affects reason for the hydration reaction [22]. …”

Section: Resultsmentioning

confidence: 99%

Residual Mechanical Properties of Concrete Made with Crushed Clay Bricks and Roof Tiles Aggregate after Exposure to High Temperatures

2016

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This paper presents the residual mechanical properties of concrete made with crushed bricks and clay roof tile aggregates after exposure to high temperatures. One referent mixture and eight mixtures with different percentages of replacement of natural aggregate by crushed bricks and roof tiles are experimentally tested. The properties of the concrete were measured before and after exposure to 200, 400, 600 and 800 °C. In order to evaluate the basic residual mechanical properties of concrete with crushed bricks and roof tiles after exposure to high temperatures, ultrasonic pulse velocity is used as a non-destructive test method and the results are compared with those of a destructive method for validation. The mixture with the highest percentage of replacement of natural aggregate by crushed brick and roof tile aggregate has the best physical, mechanical, and thermal properties for application of such concrete in precast concrete elements exposed to high temperatures.

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Experimental study of mechanical properties of normal-strength concrete exposed to high temperatures at an early age

Cited by 100 publications

References 20 publications

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

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

Effect of elevated temperature on the compressive strength of concrete produced with pulverized steel mill scale

Residual Mechanical Properties of Concrete Made with Crushed Clay Bricks and Roof Tiles Aggregate after Exposure to High Temperatures

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