Short-term loading and deformation of concrete in uniaxial tension and pure torsion

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Abstract
Summary Complete stress-strain and torque-twist curves for concrete and micro-concrete under short-term loading have been obtained for single sizes and wide gap-gradings of aggregate of two different types. The importance of eliminating effects due to both aggregate absorption and the testing technique is emphasized. When the volume fractions of cement and water were kept constant, the uniaxial tensile strength, ‘modulus of elasticity/plasticity’, tensile stress at the onset of microcracking, ‘modulus of rigidity/plasticity’, and ultimate torsional strength of concrete all decreased with increasing aggregate size and with increasing proportions of coarse aggregate. The tension results confirm that there is a critical minimum ratio of fine aggregate to cement below which there is a considerable decrease in strength whereas the torsion results provide little evidence for this critical ratio.

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