Time-dependant behaviour of engineered cement-based composites

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dc.contributor.advisor Van Zijl, G. P. A. G.
dc.contributor.author Boshoff, William Peter en_ZA
dc.contributor.other University of Stellenbosch. Faculty of Engineering. Dept. of Civil Engineering.
dc.date.accessioned 2007-10-31T12:33:56Z en_ZA
dc.date.accessioned 2010-06-01T08:16:27Z
dc.date.available 2007-10-31T12:33:56Z en_ZA
dc.date.available 2010-06-01T08:16:27Z
dc.date.issued 2007-03 en_ZA
dc.identifier.uri http://hdl.handle.net/10019.1/1249
dc.description Thesis (PhD (Civil Engineering))--University of Stellenbosch, 2007.
dc.description.abstract ECC (Engineered Cement-based Composites) is a type of HPC (High Performance Concrete) that was engineered to overcome the weaknesses of ordinary concrete. It shows high ductility as it can resist the full tensile load at a strain of more than 3 %. This superior response is achieved with multiple cracking under tensile loading which has a pseudo strain hardening phenomenon as result. The purpose of the research project reported in this dissertation is to investigate and characterise the time-dependant behaviour of ECC and create a constitutive model to numerically simulate the static and time-dependant behaviour of ECC. To investigate the time-dependant behaviour experimentally, rate and creep tests were done on the meso- and macro-level while rate tests were done on the structurallevel. The meso-level was represented by the pull-out testing of fibres embedded in the cement-based matrix and direct tensile tests were done for the macro-level. Flexural tests on thin beams were done to simulate the structural-level. Strong time-dependant behaviour was found on all three these levels. On the meso-level, the most prominent finding is that the failure mechanism can change with a change of strain rate, i.e. fibre pull-out at a low pull-out rate, while with a high pullout rate, fibre rupture can occur. Even though the strength of a tensile specimen on the macro-level showed a dependence on the strain rate, the ductility remained constant over four orders of magnitude of the strain rate. On the structural-level, however, a reduction of the flexural ductility was found with an increase of the ... en_ZA
dc.format.extent 14176778 bytes en_ZA
dc.format.mimetype application/pdf en_ZA
dc.language.iso en
dc.publisher Stellenbosch : University of Stellenbosch
dc.subject Dissertations -- Civil engineering en
dc.subject Theses -- Civil engineering en
dc.subject Fiber-reinforced concrete en
dc.subject Cement composites en
dc.title Time-dependant behaviour of engineered cement-based composites en_ZA
dc.type Thesis en_ZA
dc.rights.holder University of Stellenbosch
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