The research reported in this thesis was carried out in two phases to investigate the behaviour of reactive powder concrete (RPC) columns. In the first phase of this study, six steel fibre reinforced RPC columns of 150 mm square cross section were tested to failure under various loading eccentricities. The RPC mix contained 2 percent (by volume) of straight steel fibres with a concrete strength of about 150 MPa. The columns contained either 4 or 7 percent of longitudinal reinforcement but no tie reinforcement in the test region. All the columns failed in a controlled manner and no buckling of the longitudinal steel or cover spalling was observed, even well beyond the peak load. The tests revealed that stirrups can be significantly reduced for steel fibre reinforced RPC columns, which could lead to an increase in the speed of construction with an associated potential reduction in construction costs. In the second phase, 17 RPC columns were tested with 16 confined using carbon fibre reinforced polymer (CFRP). The concrete mix contained either no fibres or 2 percent (by volume) of straight steel fibres with concrete strength of approximately 160 MPa. The columns contained no conventional steel reinforcement. For the concentrically loaded specimens, failure occurred at or close to the peak loading and the CFRP increased the strength by 19 percent compared with the unconfined specimen. The tests showed that the formulae developed to predict the peak strength of concentrically loaded FRP confined conventional strength concrete columns, in general, overestimate the load carrying capacity of FRP confined RPC specimens. The CFRP was shown to be effective in controlling the failure for the eccentrically loaded specimens. There was no evidence, however, that the use of CFRP in the hoop direction significantly increased the strength of the columns. Three dimensional nonlinear FE analyses of the test specimens were undertaken using the program DIANA. The FE analyses showed a reasonable comparison with the experimental results for the specimens tested under eccentric loading.

Thesis (PhD)--University of South Australia, 1996

Thesis (PhD)--University of South Australia, 1996

Thesis (PhD)--University of South Australia, 1996

The properties of prepacked concrete have long been studied and compared with those of normal concrete, although very little is known about its strength and deformation behaviour. Either by experiment or theory these aspects have been described in different ways. This thesis describes some experimental programmes on prepacked concrete that include its manufacture and a study of its strength, deformation and failure mechanism. To compare these aspects, normal concretes having the same water-cement and aggregate-cement ratios were made and tested under the same condition. The experimental work investigates the use of different types of admixture in grout in order to improve the strength of prepacked concrete. Among them the expanding admixture was found to be most suitable. Data are presented on some properties of grout using different types of admixture at various sand-cement ratios. Along with the strength investigation, investigation on modulus of elasticity, creep and shrinkage were also carried out. Tests of creep and shrinkage reveal that the magnitudes of both in prepacked concrete were much lower than in normal concrete. Different aspects of the failure mechanism of prepacked concrete are also presented and discussed.

Thesis (M.S.)--Ohio State University, 1989. / Includes bibliographical references.

Thesis (M.S.)--West Virginia University, 2008. / Title from document title page. Document formatted into pages; contains vi, 58 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 40).

Thesis (Ph. D.)--Brigham Young University. Dept. of Chemical Engineering, 2007. / Includes bibliographical references (p. 161-168).

Thesis (M.S.)--Auburn University, 2007. / Abstract. Vita. Includes bibliographic references (ℓ. 202-207)

Thesis (Ph.D.)--Hong Kong University of Science and Technology, 2007. / Includes bibliographical references (leaves 288-293). Also available in electronic version.