Composite concrete-steel beams are widely used for highway bridge structures and to a lesser extent for building floors. These structures are made from steel beams which support a concrete slab. The concrete slab serves a dual purpose: It provides a deck or working surface and it acts as the top flange of the supporting beam. The compressive forces are resisted by the concrete slab; the tensile forces are resisted by the steel beam; and the horizontal shear between these two elements is resisted by shear connectors which are welded to the steel beam and embedded in the concrete slab. The resulting structure has greater stiffness, shallower construction, greater live load factor of safety and often greater economy than a non-composite structure designed for the same loads.

Measurements on the swelling pressure of oriented samples of Na-montmorillonite at dialysate concentrations of 10^-4 and 10^-2 M NaCl were made at temperatures ranging from 0°C to 25°0 in a specially designed temperature - swelling apparatus. The results indicate that at a dialysate concentration of 10^-4 M NaCl, the swelling pressure predicted from the combined Poisson-Boltzmann equation agreed closely with the measured pressures at the temperatures considered – swelling pressure decreased with decreasing temperature as predicted from the equation. Measured pressures were in all cases slightly smaller than the predicted pressures.

Two 14 WF 30 beams, each with an eight-inch diameter opening in the web, were tested. The beams were subjected to different loading conditions so that various combinations of shear and bending moment existed at the opening. A study of the stress distributions around the openings was made. The results were compared to the theories developed on the basis of the theory of elasticity and on the basis of the simplified method of the Vierendeel Truss solution. Expressions were derived for the stresses. The investigation showed the presence of high stress concentrations at the edge of the large circular opening and the reduction of the yield load capacity in every case examined. There was no reduction in the ultimate load capacity in the beams tested except in the case of pure bending.

The limitations of the presently available techniques concerning the prediction of frost effects were pointed out. A freezing apparatus was designed and constructed to conduct laboratory freezing tests on Arctic soils. The experimental observations did not agree with predictions based on the currently used grain-size criterion. A new frost-susceptibility concept was introduced end a method of evaluating relative frost-susceptibility was proposed. Predicted values were successfully compared with observed frost effects. The relative importance of external conditions was discussed for the particular case of rapid freezing. Laboratory observations were applied with success to the prediction of frost penetration for Lake Hazen conditions.

The investigations were carried out at the Primary Waste Water Treatment Plant in Beaconsfield, Quebec, and the plant performance and efficiency determined. The removal values of Suspended Solids and Chemical Oxygen Demand determined, compared favourably with expected. Values for primary treatment processes, found elsewhere. Results of experimental tests made at the plant showed that over 10% of solids in the primary sludge could be obtained by maintaining a sludge blanket depth in the thickener of over 3 feet. Thickening of sludge was controlled by using the concept of Sludge Volume Ratio S.V.R., defined as the volume of sludge blanket held in the thickener, divided by the volume of sludge pumped per day from the thickener.

The purpose of this study is to examine the treatment process at ten plants in the Montreal area, located on the Riviere des Mille Iles and the Riviere des Prairies, treating the water for public water supply. The efficiency and economy of these ten municipal filtration plants have been examined. Field surveys have been made and samples collected over a period of eleven weeks to accumulate data for interpretation. The quality of raw water and its fluctuation, particularly during the spring break-up of the rivers, is considered. The application efficiency and quantity of chemicals employed in water coagulation are investigated. The efficiency of water treatment prior to filtration is related to data of removals obtained.

This thesis deals with the computation and study of small elastic displacements and stresses in axially symmetric spherical shells. All loads and reactions are assumed to be symmetrical with respect to the axis of the shell and consequently the displacements and stresses are functions of only one independent variable, the co-latitude. Although the application of major interest to the author is the analysis of reinforced concrete shell roofs, the theory is equally applicable to the design of tanks and pressure vessels, radomes, nuclear reactor containment vessels and other structural components in the form of a spherical cap.

Strain rates ranging from 20% to 100% per second were used in consolidated-undrained triaxial tests, to investigate the influence of rate effects on the behaviour of cohesive soils. To apply the required loading rates, a hydraulic test unit was designed. Techniques were developed for producing saturated remoulded samples and for measuring the applied stresses, strain and pore pressures in the dynamic test. Electrical instrumentation was used for sensing and recording the transients. No pore pressure measurements were obtained in the dynamic tests conducted. For the same consolidation pressure, the strength of samples as determined in a triaxial test increased with increasing strain rates. Rate dependent dilatational effects are not the predominant cause of the observed behaviour.

This thesis presents the account of an investigation into the effects of the rate of strain used in testing on the measured shear strength characteristics of three types of clay soils. The investigation consisted of undrained triaxial testing of specimens of each type of clay under varying conditions of cell pressure and strain rate. [...]

Mont St. Hilaire is situated about 25 miles south-east of Montreal. The top of this mountain consista of an outer rampart surrounding an inner basin. In the lowest part of the inner basin lies Lake Hertel, at approximately latitude 45 32' north and longitude 73 09 1 west. Mont St. Hil1aire and environs are shown on Map No. 1. The Lake is fed by two smal1 streams which drain the western and northern parts of the basin. The surface area of the Lake varies between about 71 and 75 acres, the average area being 72.73 acres at water surface elevation of 568 feet above mean sea level. The Lake and its drainage basin are shown on Map No. 2. Formerly, the Lake was drained by a stream at its south side; but in 1939, a dam was built across the south end to help regulate the Lake level. [...]