To increase participants’ awareness of the design, manufacture, and use of various concrete mixtures, methods of concrete construction and associated issues.
Who Should Attend?
Those responsible for the construction, inspection, and/or testing of municipal concrete projects.
General Inspection (TM32) is recommended.
This course is recognized by:
Calculator, hard hat, safety vest, safety boots and safety glasses are required for the laboratory and field trips. Appropriate outdoor clothing is required for the plant tours.
Presentations, case studies, displays, laboratory and field trips.
Work assignments, case studies, comprehensive final examination and an overall grade of 60% required to pass. Group case studies and assignments are an integral part of the course and may require evening work.
Familiarity with CSA A23.1 & .2 and OPSS No. 904 and 1350 is suggested.
Cements and Supplementary Materials
The types and characteristics of portland and slag cements, fly ash and supplementary cement materials (SCM) are described. The selection of cement for specific applications is discussed. Explanations of concrete strength gain, the effect of cement fineness, setting tendencies, hydration and curing are provided. Methods of cement handling and storage are briefly discussed.
The purpose of air entrainment, its effect on concrete durability, permeability, water tightness, workability, yield, segregation, bleeding, plasticity, strength, finishing, volume change, elasticity, creep and unit weight are described.
This topic deals with adjustments to the concrete design to produce the desired yield and workability of the concrete, together with mix adjustments to meet the requirements for all types of concrete construction. Topics such as specific surfaces, void spacing, water:cement ratio, compressive and flexural strength, shrinkage, and bleeding are discussed.
The types, characteristics, and functions of admixtures are described including the appropriate use of air entraining agents, accelerators, retarders, expansion agents, pozzolans, super plasticizer and water reducing agents. The effects of admixtures on setting time, workability, durability, volume change, shrinkage, bleeding, cracking and finishing will be covered.
The function and nature of aggregates are described. The presentation includes basic geology and specific Ontario formations and deposits to explain the origin of aggregates, the identification of different rock types and the properties of aggregates suitable for concrete. Testing of aggregates for physical characteristics such as gradation, shape, soundness, strength, petrographic number, absorption and density is covered. Aggregate gradation is covered with an emphasis on the importance of concrete workability, strength, placeability, consolidation, economy, yield, and finishing characteristics. Alkali aggregate’s reactivity and their effect on long term durability is covered in detail. Canadian Standards A23.1 and A23.2 and the MTO concrete aggregate sources list and their use are discussed.
Field and Laboratory Testing
Presentations show the approved CSA methods for sampling and testing concrete. The American Concrete Institute (ACI) Concrete Field Testing Technician Grade I certification program is reviewed. Participants are shown how concrete field testing is performed. Participants will be required to perform testing on concrete materials and plastic concrete during a tour of a concrete and aggregate testing laboratory.
Ready Mix Concrete
This module offers a basic understanding of a ready mix plant and how it meets industry standards (such as RMCAO certification) to ensure it conforms to municipal standards. The presentation includes the characteristics of various types of plants, emphasizing the proportioning process. Concrete heating and cooling systems are described. A tour of a ready mix concrete plant is included.
Transporting, Placing, Consolidating and Finishing
Various types of concrete transportation equipment including trucks, pumps, conveyors, buggies and buckets are described. The procedures for using different placing methods such as chutes and elephant trunks are discussed. The techniques for the placement and consolidation of cast-in-place concrete are described. A variety of finishing techniques is covered in detail.
This presentation discusses the importance of curing concrete. Types of curing materials, methods of application and specification requirements for curing concrete are discussed. The use of wet curing, including water ponding, water sprinkling, steam and wet burlap is described. The need to prevent moisture escape from fresh concrete by the use of membranes, plastic sheets, waterproof paper, tarpaulins, or the use of forms left in place is emphasized.
Pre-Construction and Pre-Placement Meetings
Participants will discuss the various items that should be reviewed with the contractor and relevant subcontractors and suppliers at the outset of a contract, and prior to placement of concrete on bridges, roads and civil works.
Forms and Falsework
Various formwork and falsework techniques as well as hardware for formwork are described. Fixed and slip form techniques will also be discussed and samples of equipment will be demonstrated.
This presentation covers the purpose of reinforcing steel, types and grades of materials, placing and handling techniques normally used in municipal work.
Curb and Gutter, Sidewalk, and Concrete Barrier Wall Construction
This presentation covers the various types of curbs and gutters, barrier walls, and the slip form machines that often produce them. The sidewalk construction portion encompasses placing, finishing, design options regarding reinforcement and/or jointing, joint sealing, texturing, edging and curing techniques.
Hot and Cold Weather Concrete
Solutions to the many problems associated with placing, finishing and curing concrete in hot and cold weather are discussed. This module deals with the problems of achieving specified strengths and concrete durability in adverse weather conditions, and the problems of plastic and drying shrinkage. The cold weather concrete discussion deals with protective housing, insulation, and thermal shock. Considerations for concrete construction under all adverse weather conditions are described.
Causes of distress in concrete and the removal of deteriorated concrete and reinforcement from structures is reviewed. Placing, finishing and curing of repair concrete such as overlays is discussed, along with the removal and replacement of expansion joints. Shotcrete, quick set concrete, high performance concrete, waterproofing and other repair strategies are explored.
Relevant Codes, Standards and Specifications
Codes and standards commonly used will be reviewed, including relevant CSA and OPS standards. Selected OPS standards are included in the course material.
Precast Concrete Products
Manholes, catch basins, culverts, barriers, concrete pavers and concrete pipe will be covered both in class and on a site tour. The production, curing, handling, care and control required for installation of these products is covered.
During tours of a cement manufacturer, ready mix concrete plant, and hands on demonstration of proper placement procedures, participants will learn about the processes involved in the manufacture of these products. Testing of construction materials specific to concrete will be demonstrated at a geotechnical laboratory.
Register online or send to firstname.lastname@example.org or fax to 289-291-6477.
Sandra Lawson is the Town Engineer for the Town of Ingersoll in Southwestern Ontario. Ms. Lawson has over 35 years experience in Municipal Engineering and has been involved with the Ontario Provincial Standards for Roads and Public Works for over 15 years on the Pavement and Standards Management Committee.
Sandra Lawson is a graduate of Applied Science; Civil Engineering from Queen’s Engineering and started her career working as a Project Engineer in Medicine Hat, Alberta for Alberta Transportation. On returning to Ontario in 1988, Ms. Lawson spent several years with both a contractor and consulting firm before entering municipal engineering in 1992 as the Deputy and County Engineer in Huron County. Ms Lawson then spent ten years with the City of Brantford starting in 2002 as the Deputy Engineer and then the General Manager of Engineering & Operational Services. After a brief stint as the Director of Transportation & Environmental Services with the City of St. Catharines, she became the Town Engineer for the Town of Ingersoll in 2013.
Ms. Lawson is an active member of the Municipal Engineers Association being its President in 2004 and a previous Western Region Director of OPWA, as well as a member of PEO and a 4th generation engineer.
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