Further Investigations on the Diffusivity of Concrete

Lo, Evan (2008). Further Investigations on the Diffusivity of Concrete Honours Thesis, School of Engineering, The University of Queensland.

       
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Author Lo, Evan
Thesis Title Further Investigations on the Diffusivity of Concrete
School, Centre or Institute School of Engineering
Institution The University of Queensland
Publication date 2008
Thesis type Honours Thesis
Supervisor Professor Dux
Total pages 65
Language eng
Subjects 0905 Civil Engineering
Formatted abstract
Plastic shrinkage is the shrinkage of freshly placed concrete that takes place before the concrete has set. This phenomenon occurs when the rate of evaporation exceeds the rate at which bleeding water rises to the surface as the cement mixture sets. At this stage, since the surface of the concrete has attained some initial rigidity, it cannot accommodate plastic shrinkage by plastic flow. Consequently, tensile stresses develop on the surface and cracks form. A number of mathematical models have been developed over the century to predict the rate at which concrete bleeds; however there is still yet to be a standard model which caters for the diffusivity of concrete in all aspects. This report further investigates a mathematical model developed recently by Morris (2005) who continued the work of previous researchers, but taking into account the time of set. By being able to determine the rate at which freshly placed concrete bleeds, standard precautions, preventive and corrective methods can be set up by the contractor and consultants alike which can bring about significant economic benefits and will not hinder concrete construction or adversely influence concrete strength or durability.
Keyword Diffusivity of Concrete

Document type: Thesis
Collection: UQ Theses (non-RHD) - UQ staff and students only
 
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Created: Fri, 31 Oct 2014, 09:50:56 EST by Asma Asrar Qureshi on behalf of Scholarly Communication and Digitisation Service