Time-dependant behaviour of engineered cement-based composites

dc.contributor.advisorVan Zijl, G. P. A. G.
dc.contributor.authorBoshoff, William Peteren_ZA
dc.contributor.otherUniversity of Stellenbosch. Faculty of Engineering. Dept. of Civil Engineering.
dc.descriptionThesis (PhD (Civil Engineering))--University of Stellenbosch, 2007.
dc.description.abstractECC (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.extent14176778 bytesen_ZA
dc.publisherStellenbosch : University of Stellenbosch
dc.subjectDissertations -- Civil engineeringen
dc.subjectTheses -- Civil engineeringen
dc.subjectFiber-reinforced concreteen
dc.subjectCement compositesen
dc.titleTime-dependant behaviour of engineered cement-based compositesen_ZA
dc.rights.holderUniversity of Stellenbosch

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