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Characterisation of Early Age Deformations in Cement Paste: Case of Chemical and Autogenous Shrinkage

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Document pages: 17 pages

Abstract: Concrete is commonly seen as a durable and long-lasting constructionmaterial. However, the long-term performance of a concrete structure can begreatly compromised by early-age cracking. This work is an experimentalcontribution to study early age deformations of cement paste. Its aim is,firstly, to develop an experimental dispositive for assessing chemical andautogenous shrinkage, and secondly, to measure these volumetric deformations incement paste. The setup was done following the gravimetric method ofmeasurement, which exploits the Archimedes’ principle. It is made up of anelectronic balance, a data accusation unit, a temperature control unit and abuoyancy bath. Investigations were done on Portland cement (CPA-CEM II) at thefollowing W C ratios: 0.25, 0.3, 0.35, 0.4 and 0.5. It was noticed that thewater-cement ratio does not influence the magnitude of the chemical shrinkagein a significant manner but had a kinetic effect; a lower W C induces a fasterrate of chemical shrinkage. Autogenous shrinkage was discovered to be highlyinversely proportional to the W C and was also noticed to be in a function ofchemical shrinkage within the first 2 to 4 hours when the paste was stillliquid.

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