Structural Evaluation and Performance of Portland Cement Concretes After Exposure to High Temperatures

Tolentino, Evandro; Lameiras, Fernando Soares; Gomes, Ana Maria Rabelo; Silva, Claudio A. Rigo da; Vasconcelos, Wander L.

doi:10.1590/s1516-14392002000100005

Cited by 6 publications

(2 citation statements)

References 9 publications

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“…The w/c 0.4 has the highest density, although this does not correspond to lowest pore volume. This could be attributed to the fact that although low w/c ratios are reported to provide denser pore structures, they are also reported to be at risk of developing more coarse open cracks during heat treatment, which occurred during the pore volume testing (Tolentino et al, 2002). The w/c 0.55 was only 3 per cent less dense and 0.75, 7 per cent less dense than w/c 0.4 (Figure 21).…”

Section: W/c Ratiomentioning

confidence: 99%

Thermo-mechanical performance of concrete with alternative binder material

Kirton

Richardson²,

Agnew³

2013

Structural Survey

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Thermo-mechanical performance of concrete with alternative binder material. AbstractPurpose -This paper investigates the effect of changes to fundamental components of concrete; cement type, water/cement ratio, aggregate size & age, on thermo-mechanical properties.Understanding the heat transfer properties of construction materials will enable a reduction in energy expenditure and associated CO 2 emissions, contributing to a more sustainable built environment.Design/methodology/approach -Concrete specimens were subject to steady state heat transfer test methods to determine thermal conductivity and specific heat values. Pore volume of specimens was determined using water displacement method and compressive strength of specimens was tested according to procedures identified BS EN 12390 -3 (2009).Findings -Cement type CEM I produced the lowest thermal conductivity values by a maximum of 30%, with the cement type group CEM I corresponding to higher pore volumes and lower densities than cement type group CEM II. Specific heat was higher in cement types containing CEM II compared to cement type group CEM I, with cement type being the dominant factor determining specific heat out of cement type, w/c ratio and aggregate size. W/c ratio 0.55 provided the lowest thermal conductivity values of the w/c ratio specimens, however w/c ratio had no impact on the specific heat capacity of concrete. Cement type is found to be the most dominant component of concrete of the properties tested.Originality/value -This paper presents knowledge of the thermal performance of concrete with easily achieved changes to concrete mix design, which can be used alone or combined for maximum effect, and their impact on compressive strength. Steady state heat transfer techniques in a low moisture environment, provides originality to the study of the behaviour of cement replacements as previous research has been based on transient techniques. The use of steady state heat transfer experimentation allows important thermal properties, thermal conductivity and specific heat to be calculated.

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Section: W/c Ratiomentioning

confidence: 99%

Thermo-mechanical performance of concrete with alternative binder material

Kirton

Richardson²,

Agnew³

2013

Structural Survey

View full text Add to dashboard Cite

show abstract

“…Composite structures have a peculiar behavior, justified by their heterogeneity 2 . In this context, reinforced concrete structures, when subjected to any thermal variations, might have their performance altered mainly due to the concrete components 3,4 , which includes the loss of bearing capacity and/or structural performance. Additionally, it is observed that the slender the element, the greater the designer's concern regarding the thermal load on the structure.…”

Section: Introductionmentioning

confidence: 99%