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Title: The effect of creep and moisture conditions on the failure of concrete under uniaxial tension stress
Author: Domone, P. L. J.
ISNI:       0000 0004 2737 0423
Awarding Body: University College London (University of London)
Current Institution: University College London (University of London)
Date of Award: 1972
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This thesis describes work carried out on the properties of plain concrete under uniaxial tensile stress, using the test method previously developed at University College. In the first chapter a review is made of the present state of knowledge of the structure of concrete, shrinkage and creep properties, and the behaviour of concrete under short-term loading, wherever possible comparing properties under tension and compression. 'The importance of cracking is also discussed. An initial test series was carried out to determine the effectiveness of the test method, and its inherent variability. It proved to be satisfactory in both respects. Strains were measured by internal vibrating wire gauges, which were found to have a small, but significant effect on failure stress. This, however, could be allowed for. The main test series was designed to assess the effect of shrinkage (for a period of up to 21 days) and creep (for a period of up to 14 days at 35% ultimate load) on the short-term failure properties (stress, strain and Young's modulus) of seven different mixes. Specimens could be under immersed, sealed or air drying ambient conditions. The results show that any variation in properties is not significantly greater than the inherent variation of the test system. The influence of mix proportions and curing conditions on the tensile short-term failure properties and the ultrasonic pulse velocity of the concrete is discussed. The third test series was designed to study the effects of tension on several well-known phenomena of compressive creep, i.e. creep recovery, combined creep and shrinkage, creep under fluctuating humidity, and creep at all levels of loading up to 90%of the ultimate short-term strength. Similar trends to those in compression were observed, and existing theories of creep, and the influence of cracking are examined in the light of these results.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available