Effectiveness of the fineness of two South African Portland cements for controlling early-age temperature development in concrete.

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dc.citation.epage45en_ZA
dc.citation.issue1en_ZA
dc.citation.spage39en_ZA
dc.contributor.authorGraham, P.C.
dc.contributor.authorBallim, Y.
dc.contributor.authorKazirukanyo, J.B.
dc.date.accessioned2016-11-03T12:37:02Z
dc.date.available2016-11-03T12:37:02Z
dc.date.issued2011
dc.description.abstractTemperature gradients due to heat of hydration of cement can cause cracking and present serious structural and serviceability concerns in concrete structures. Engineers use a wide range of strategies to limit the potential for such cracking, mainly by minimising the maximum temperature in the concrete. This paper considers the possibility of using more coarsely ground cement as one of the strategies for reducing the maximum concrete temperature. Two cement clinkers were used to produce cements with five different levels of fineness. These ten cements were then used to make concretes which were tested in an adiabatic calorimeter to determine the heat evolution characteristics. The measured results were then used in a computational model to calculate the temperature profiles likely to occur in two types of concrete elements. The results indicate that the effect of increasing fineness on the total amount of heat released during hydration is dependent on the mineralogy and crystal composition of the cement clinker. Also, the use of coarse-ground cement as a means of reducing the maximum temperature in concrete is more effective in the case of concrete elements with high cement content but of moderate dimensions. In sections of larger dimension, coarse-ground cements show lower levels of temperature reduction but also lower thermal gradients.en_ZA
dc.description.librarianMvdH2016en_ZA
dc.description.sponsorshipFinancial support from the Cement & Concrete Institute, National Research Foundation and Eskom (TESP).en_ZA
dc.description.urlhttp://saice.org.za/services/journalen_ZA
dc.identifier.citationGraham, P.C., Ballim, Y. and Kazirukanyo, J.B. 2011. Journal of the South African Institution of Civil Engineering 53(1), pp. 39-45.en_ZA
dc.identifier.issn1021-2019
dc.identifier.urihttp://hdl.handle.net/10539/21385
dc.journal.titleJournal of the South African Institution of Civil Engineering.en_ZA
dc.journal.volume53en_ZA
dc.language.isoenen_ZA
dc.publisherThe South African Institution Of Civil Engineering.en_ZA
dc.rightsOpen Access.en_ZA
dc.subjectCalorimetryen_ZA
dc.subjectCementen_ZA
dc.subjectConcrete temperatureen_ZA
dc.subjectFinenessen_ZA
dc.subjectModelingen_ZA
dc.subjectConcrete temperatureen_ZA
dc.subjectHeat evolutionen_ZA
dc.subjectPortland cementen_ZA
dc.titleEffectiveness of the fineness of two South African Portland cements for controlling early-age temperature development in concrete.en_ZA
dc.typeArticleen_ZA
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