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- W36420177 abstract "This thesis considers the tensile deformation characteristics ofpolypropylene fibre reinforced hardened cement paste having heterogeneousfibre geometries and a range of volume concentrations.Polypropylene fibres were prepared under various manufacturingconditions using a laboratory extruder, to ascertain the effect ofthese conditions on fibre characteristics.The relevant properties of cement paste likely to influence thepolypropylene fibres and the eventual composite were investigated.An investigation of continuous aligned fibre composites in tension,containing various volume concentrations of fibres, showed thatmultiple cracking occurred despite the elastic modulus of the fibrebeing considerably lower than that of the hardened cement paste.Factors which enabled fibre/matrix contact to be maintained duringthe multiple cracking process, despite the unfavourable Poisson'sratio of polypropylene, were considered.Discontinuous aligned fibre composites were tested in tension, toascertain the effect of volume concentration and length of fibres onthe shear stress transfer between fibre and matrix and on multiplecracking.Composites containing parallel fibres, with fibre directions atvarying angles to the direction of applied tensile stress, allowedan assessment to be made of the role of inclination. Crackdistributions, pull-out behaviour of fibres and the ultimate stressof composites were investigated.Finally, random fibre reinforced composites were evaluated to providea comparison with the Continuous, Discontinuous and Inclined fibrereinforced systems.In addition to determining the mechanical deformation of the variouscomposites, the acoustic emission associated with internal deformationmechanisms was studied. This was undertaken with equipment capableof monitoring a range of acoustic pulse parameters." @default.
- W36420177 created "2016-06-24" @default.
- W36420177 creator A5038266305 @default.
- W36420177 date "1982-01-01" @default.
- W36420177 modified "2023-09-26" @default.
- W36420177 title "Polypropylene fibre reinforcement of hardened cement paste" @default.
- W36420177 hasPublicationYear "1982" @default.
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