Tensile strength of early age concrete

Tiong, Toh Boon (2005). Tensile strength of early age concrete B.Sc Thesis, School of Engineering, The University of Queensland.

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Author Tiong, Toh Boon
Thesis Title Tensile strength of early age concrete
School, Centre or Institute School of Engineering
Institution The University of Queensland
Publication date 2005
Thesis type B.Sc Thesis
Supervisor Dr Peter Morris
Dr. Peter Dux
Vinh N.T. Dao
Total pages 43
Language eng
Subjects 0905 Civil Engineering
Formatted abstract

Plastic cracking of concrete is caused by evaporation from unprotected surfaces due to the desiccation of concrete. The purpose of this undergraduate project thesis is to experimentally investigate the fracture characteristic and the cracking of early age concrete and flyash, taking into consideration the total suction being develop in the pore water in the voids adjacent to these surfaces. Concrete is particularly vulnerable to cracking due to its low tensile strength during its early stages of strength development. During the initial stages, three specimens of flyash with either different moisture content (10%, 20% and 30%) or NaCl solution of 8.9%, 16% and 24% were tested. Specimens of 25mm and 80mm slump concrete were also tested. Both flyash and concrete were tested using the INSTRON machine. In this paper, equations describe total suction and fracture energy was briefly described. As the behaviour of early age concrete exhibited the same behaviour as soil, the results obtained can be comparable to the properties of soils. Under the guidance of Professor Peter Morris and Associate Professor Peter Dux, a number of specimens were tested, recorded and analysed. These results with the conclusion drawn, will enable a better understanding of how the properties of early age concrete developed.

Keyword Concrete -- Cracking
Additional Notes * Undergraduate projects for CIVL4560,June 2005, from the Dept. of Civil Engineering.

Document type: Thesis
Collection: UQ Theses (non-RHD) - UQ staff and students only
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Created: Tue, 23 Apr 2013, 09:39:55 EST by Mr Yun Xiao on behalf of Scholarly Communication and Digitisation Service