Recycled concrete made with different natural coarse aggregates exposed to high temperature

Zega, Claudio Javier; Maio, Ángel Antonio Di

doi:10.1016/j.conbuildmat.2008.08.017

Cited by 134 publications

(46 citation statements)

References 6 publications

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“…According to Zega and Di Maio [34,35] high temperature performance of RAC prepared with low w/c ratios were better than that of conventional concretes. The coefficient of Thermal Expansion (CTE) of the old/new mortar interface was perceived to be comparable and its compatibility reduced micro/macro cracking of the cement mortars.…”

Section: Introductionmentioning

confidence: 91%

“…As Zega and Di Maio [34,35] explained, the Coefficient of Thermal Expansion (CTE) of the old/new mortar interface was perceived to be comparable and its compatibility reduced micro/macro cracking of the cement mortars. But after exposure to 800ºC, the concretes made with FA and GGBS apparently had lower residual strength than that of the Portland cement concretes, probably as a consequence of the coarsening of the pore structure.…”

Section: Compressive Strengthmentioning

confidence: 97%

See 1 more Smart Citation

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

111

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Section: Introductionmentioning

confidence: 91%

Section: Compressive Strengthmentioning

confidence: 97%

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

111

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“…The mortar quantity in RCA concrete tends to be elevated. For this reason, a study [16] examined the effect of increasing the mortar content by varying the w/c ratio from 0.4 to 0.7. The authors concluded coarse RCA concretes with a low w/c ratio performed better in residual compressive strength than conventional concretes when they were exposed to high temperatures.…”

Section: Introductionmentioning

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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“…Unlike traditional mixing approach, water was divided into two parts and recycled aggregate was first coated with a thin cement mortar and then mixed with the remaining water. In addition, some experiments were conducted by pre-soaking aggregate with acid solution [16] or heating aggregate at 500°C for 1 h [17] to remove the attached old cement mortar. Much work had been carried out on using mineral additives of fly ash or silica fume [18][19][20] as well as ''cement wrapped aggregate'' method [21] to modify recycled aggregate, which resulted in a higher strength of the concrete.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of pre-coated recycled aggregate for concrete and mortar

Zhao¹,

Wang²,

Lu³

et al. 2013

Construction and Building Materials

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Recycled concrete made with different natural coarse aggregates exposed to high temperature

Cited by 134 publications

References 6 publications

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

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

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

Evaluation of pre-coated recycled aggregate for concrete and mortar

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