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G841: Report of Field Evaluation of Field-Molded Sealants for Dams in Cold Climates

This project involved the study of installation techniques, inspections and performance evaluations of field-moulded joint sealants for dams in cold climates. The main objectives were to conduct a long-term, large-scale study in collaboration with maintenance personnel on selected field-moulded sealants in joints at a dam site under extremely cold climatic conditions and to prepare a report giving details about installation techniques (specifications), periodic inspections, evaluation and perfor

Apr 1, 1992 - Apr 1, 1995

DSIG

Research

G578: Joint Seals For Hydraulic Structures For Severe Climatic Conditions

Joint seals traditionally used for contraction/expansion joints for hydraulic structures have consisted of field-moulded, chemical curing and elastomeric sealing compounds. These seals have generally not performed well especially where the structures have been exposed to severe freeze-thaw environments and where seasonal joint movements are high. This study consisted of subjecting ten field-moulded sealants and eleven performed seals to various laboratory tests. Selection crirteria, guidelines a

Nov 1, 1990

DSIG

Research

G815Phase I: Static Ice Loads on Hydro-Electric Structures: Ice Pressures and Conditions at the Paugan Dam During the 1992 Winter

This report describes Phase I of a project that was undertaken to improve present understanding of ice loads on hydro-electric structures. Field data were collected during the 1991-92 winter at Hydro-Quebec's Paugan dam to measure the stresses in the ice in the reservoir, the distribution of ice loads between the gates and piers, and the pressures and loads on the vertical concrete face of the dam. Numerical modelling was also carried out. Numerical analyses were done using finite elements to pr

Mar 1, 1994

DSIG

Research

G839: Probable Maximum Floods (PMF) in Boreal Regions

The objectives of this study were to define a method to yield reasonable estimates of design snowpack and to establish rules to define critical temperature sequence during snowmelt for generating spring probable maximum flood (PMF) in the Boreal Region of Canada. In this report, the snowstorm maximization method, which is based on the concept of rainfall maximization used in estimating the probable maximum precipitation (PMP), has been revised and tailored for the Boreal region to estimate desig

Jan 1, 1992 - Jun 1, 1993

DSIG

Research

G927: Evaluation of the Early-Age Tensile Strain Capacity of Fly Ash Concrete and its Effect on Thermal Cracking

The objective of this research program is to evaluate the extent to which fly ash reduces the risk of thermal cracking in concrete compared with various types of Portland cements and to produce guidelines for controlling cracking in large concrete monoliths by the appropriate selection of materials.To accomplish this objective, an extensive laboratory program was undertaken to study:a) the heat of hydration of various cement/fly ash blends; andb) the heat evolution characteristics and transient

Dec 1, 1992 - Oct 1, 1995

DSIG

Research

EG910012/3: Static Ice Loads on Hydro-Electric Structures: Field Measurements Made at the Seven Sisters and Pine Falls Generating Stations During the 1996-1997 Winter

This report presents field data that have been collected as part of Phase II of a project that was undertaken to improve present understanding of ice loads on hydro-electric structures. Field data were collected during the 1996-97 winter at Manitoba Hydro's Seven Sisters and Pine Falls Generating Stations to measure the ice stresses and loads: (2) in the reservoir ice sheet (for both sites), and (b): in front of a pier, a wooden stoplog section, and a steel stoplog section (for the Seven Sister

Dec 31, 1969

DSIG

Research

G815Phase III: Static Ice Loads on Hydro-Electric Structures: Field Measurements Made at the Paugan, Arnprior and Otto Holden Dams During the 1993-94 Winter

This report presents field data that have been collected as part of Phase III of a project that was undertaken to improve present understanding of ice loads on hydro-electric structures. A more detailed analysis of these data, and of other data sets, will be included as part of the Phase III project, and these analyses will be reported under separate cover. Field data were collected during the 1993-93 winter at Hydro-Quebec's Paugan dam, and at Ontario Hydro's Arnprior and Otto Holden dams. Two

Dec 31, 1969

DSIG

Research

G519: Upgrade Soniscope Concrete Testing Instrument

A computer-based instrument to measure the velocity and relative amplitude of ultrasonic sound waves through concrete has been developed. The instrument is an essential tool for the non-destructive evaluation of the condition of the concrete in massive structures such as the gravity section of dams. It generates an ultrasonic pulse and measures the time taken for it to travel through concrete. The propagation velocity of this sound pulse through concrete is used to establish more efficient test

Jun 1, 1989

DSIG

Research

G738: Field Evaluation of Surface Repair Materials For Concrete Hydraulic Structures Damaged By Erosion

This project involves an evaluation of surface repair materials to be used for concrete hydraulic structures damaged by erosion. The work comprised three phases: a laboratory study, a small-scale study and a large-scale field study, which included an economic feasibility study.The main objectives were to evaluate and select the best available surface repair materials, develop materials (some with the aid of manufacturers) and modify and optimize the properties of the materials that had shown the

Aug 1, 1994

DSIG

Research

G905: Structural Safety of Existing Concrete Dams: Influence of Construction Joints

Weak concrete lift joints in gravity dams significantly reduce the ability to resist floods and earthquakes of large magnitudes. The objective of this work is to study the structural response of existing concrete dams under thermal load, AAR swelling and seismic loads. Finite element programs are used to model the behaviour of the dam in the nonlinear range taking into account cracking of the concrete. This project encompasses: 1) a literature review; 2) the development of lift joints constituti

Jan 1, 1995 - Sep 1, 1997

DSIG

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