Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.592088
Title: Fracture behaviour and long term deformation characteristics of steel fibre reinforced concrete compression members
Author: Motamedi Azari, Mehran
Awarding Body: University of Aberdeen
Current Institution: University of Aberdeen
Date of Award: 1984
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Abstract:
Concrete as a material for construction has certain inherent weaknesses such as its low tensile strength and its tendency to shrink on drying and creep under stress. In recent years, attempts have been made to increase the tensile strength and ductility of cement-based matrices. In this context, the use of steel fibre reinforcement shows considerable potential. In the present investigation, short lengths of steel fibres have been used to study the mechanics of steel fibre reinforcement in cement matrices and its influence on the fracture behaviour and deformation characteristics of concrete. The influence of steel fibre reinforcement on the fracture behaviour and load-deformation properties of concrete under short-term uniaxial compression has been studied in Chapter 3. Pour types of steel fibres were used - straight, hooked, melt extract and crimped. The effect of steel fibre reinforcement on the free shrinkage and compression creep properties of cement matrices has been studied in Chapters 4 and 5. Three types of steel fibres, namely, hooked, melt extract and crimped fibres were used. Four different mix proportions ranging from cement paste to concrete were used. In the second part of Chapters 4 and 5, suitable theories to predict the free shrinkage and compression creep of steel fibre reinforced cement matrices have been derived. The influence of steel fibre reinforcement on the performance of conventionally reinforced concrete short compression members and the short-term load-deformation properties of the concrete phase of these members has been studied in Chapter 6. Melt extract steel fibres were used. Three different stirrup spacings were used - 125, 187 and 375 mm. The effect of steel fibre reinforcement on the long term deformation characteristics of conventionally reinforced concrete short compression members has been studied in Chapter 7. In the first part of this Chapter, the shrinkage and creep properties of conventionally reinforced concrete compression members, as affected by steel fibre reinforcement, are investigated. In the second part of Chapter 7, the influence of steel fibre reinforcement on the long term deformation characteristics of conventionally reinforced concrete members under combined bending and axial compression has been studied. Melt extract steel fibres were used and stirrup spacing was kept constant at 125 mm. Steel fibre-cement matrix interfacial bond characteristics under flexure have been studied in Chapter 8. The influence of parameters such as fibre embedment length, fibre diameter, spacing between fibres and fibre content of the matrix on the fibre-matrix interfacial bond strength has been studied. Limitations of the present study, conclusions and suggestions for future research are given in Chapter 9.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.592088  DOI: Not available
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