Restricted Theses and Dissertations
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Browsing Restricted Theses and Dissertations by Department "Civil Engineering"
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- ItemEmbargoA Deterministic approach to the design of reinforced concrete beams and slabs(1972) Price, Patrick St. J.; Ross, Grant A.
- ItemEmbargoA High-order triangular finite element for the solution of field problems on orthotropic media(1971) Harrison, Derrick G.; Ross, Grant A.
- ItemEmbargoA Kalman filter-smoother for an inertial survey system of local level type(1982) Wong, Richard Voon Choong; Schwarz, Klaus-Peter P.
- ItemEmbargoA modified subspace algorithm for dynamic analysis by finite elements, and vibration control of structures(1978) Akl, Fathy Abou Zekry Ahmed; Dilger, Walter H.
- ItemEmbargoA New version of the layered shell element and non-linear analysis of cyclically symmetrical structures(1978) Talha, Medhat Ahmed; Ghali, Amin
- ItemEmbargoA Nonlinear theory of sandwich shells(1973) Malcolm, David John; Glockner, Peter G.
- ItemEmbargoA Regression method for estimating runoff(1985) Lam, Edward Wing Yu, 1959-; Muzik, Ivan
- ItemEmbargoA Study of self-cementitious property of some fly ashes(1980) Lam, David Joe-Shing; Joshi, Ramesh C.
- ItemEmbargoA Study of the effects of shape on stress-resultants and displacements in shells of revolution(1967) Sen, Amal Kumar; Glockner, Peter G.
- ItemEmbargoA Study of the stability of spherical and paraboloidal shells(1970) Kruger, Dionyz; Glockner, Peter G.
- ItemEmbargoA Systems approach to multi-stage planning of airport parking facilities(1977) Olsen, Harvey E.; Sargious, Michel A.
- ItemEmbargoAccelerated curing and analysis of fresh concrete(1974) Smith, Gordon James; Ward, Michael A.
- ItemEmbargoAn Advanced method for the analysis of rigid pavements using the finite element technique(1971) Wang, Sue Kai; Sargious, Michel A.
- ItemEmbargoAn Analytical and experimental study of the lateral load response of framed structures before and after the inclusion of infill walls(1973) Dawson, Robert Vincent; Ward, Michael A.
- ItemEmbargoAn examination of the relationship between creep and microstructural change in hardened cement paste(1979) Day, R. L. (Robert Leonard); Gamble, Bruce R.This thesis concerns an examination of the relationship between creep and microstructural change in cement paste. The primary purpose was to examine the feasibility of this relationship as a basis for the development of a general equation for creep prediction. Experiments were performed in which miniature, saturated hardened cement paste specimens of two ages (28 days and 2.5 years) were loaded in compression for 6 days and subjected to various temperature cycles. A cycle comprised 2 days at elevated temperature (311, 328, 348, or 365K); room temperature (293K) served as a base line before and after a cycle. In some cases a temperature cycle was completed before loading; in others, a cycle was performed during the loading period and/or the specimen was loaded during a temperature cycle. Nitrogen sorption and polysilicate tests served to monitor changes in the specimen structure before, during and after the load testing. Identically treated but unloaded companion specimens were also tested. For the most part, the microstructure test results supported the concept that cement paste tends towards a more stable state (structure) under the influences of temperature and stress. In both young and mature specimens temperature pretreatment produces large increases in polysilicate and the mean pore size and significant decreases in surface area. These trends are consistent with a stability increase. Stress increases the polysilicate content in young specimens, while it produces an unusual de-polymerisation effect in mature specimens. The state of the microstructure and microstructural change have important influences on creep behaviour. Generally, the creep results and the correlation with microstructural tests indicated that specimen stability at the time of loading is an important influence on subsequent creep behaviour. Three components of creep, recoverable, irrecoverable and transitional thermal creep, were examined and found to be highly dependent upon specimen history. Unusual creep behaviour (especially in mature specimens) coupled with the observations that stress and temperature alter the microstructure, lead to the conclusion that microstructural change (stabilisation) occurring during the loading period also has important effects on creep. It appears that the interrelation between stability at the time of loading and stabilisation during load can affect creep in complicated ways. A rate theory analysis was undertaken to evaluate the potential value of a stabilisation-creep relationship. It was discovered that simple rate theory must be refined to account for the highly variable cement paste structure. The use of an exhaustion theory produced a fundamental, constant-temperature creep equation of the form e=C₁⸱1n(1+C₂⸱t); C₁ and C₂ are basic parameters dependent upon general aspects of the microstructure and the environmental variables, temperature and stress. The equation accurately predicted the creep behaviour of several examinations. The apparent fundamental relationship between creep and microstructural change, and the production of a fundamental and accurate creep equation based on this relationship suggests that more work along similar lines can produce a general equation for creep.
- ItemEmbargoAn Experimental investigation of reinforced ice domes(1976) Stanley, Roger Graham; Glockner, Peter G.
- ItemEmbargoAn Investigation of bond stress distribution in the sheer span of reinforced concrete beams(1969) Sood, Krishnan Kumar; Dilger, Walter H.
- ItemEmbargoAn investigation of efficient computer techniques for the storage and retrieval of land-related information(1984) Feuchtwanger, Martin, 1960-; Lodwick, Graham D.
- ItemEmbargoAn Investigation of the use of sulphur in a roadway frost application(1977) Gifford, P. M. (Peter Marston); Gillott, Jack E.
- ItemEmbargoAn Urban truck trip generation model(1976) Hemstock, James D.; Ross, Grant A.