This seminar examines many of the advances in concrete technology that have occurred over recent years and which can provide considerable benefit to the concrete and construction industries - and ensure the design and construction of long-lasting, durable structures. The experiences of the presenter as a troubleshooting investigator are used to illustrate how incorrect practices and/or the selection of inappropriate materials can still sometimes inadvertently lead to failures and/or early deterioration of concrete.
Why You Should Attend
The program will be of special interest and a major benefit to all those involved in the design, specification, and construction of reinforced concrete structures, including government agencies, specifiers, architects, engineers and consultants, inspectors and technicians, as well as contractors' managers, supervisors and foremen. The program will also be of interest to materials suppliers' sales and technical personnel and trainees.
Why You Should Attend
In today's business world, reducing risk and avoiding liability are key factors that should be of great concern to everyone. The topics covered within the program have been designed to facilitate learning from the experiences of others - so that we can gain benefits from the use of modern advances in technology, while recognizing the cautions that we need to consider in order to avoid potential problems that can arise.
A purpose-designed binder and a USB flash drive containing comprehensive information, photographs and technical data, will be provided to each participant. Participants will be encouraged to ask questions, provide comments, and share their own experiences and problems. The cost for both the binder and USB flash drive are included in the registration fee.
Course OutlineDay 1 - registration/check-in will start at 8:00 a.m. with sessions to begin at 8:30 a.m. and adjourn at 4:00 p.m. Day 2 will commence at 8:30 a.m. and adjourn at 4:00 p.m. There will be 15 minute mid-morning and afternoon breaks. There will be a 15 minute mid-morning and afternoon coffee break. A light lunch will be provided in the classroom on both days. When registering, please indicate if you have any food allergies.
Day 1Welcome & Introduction
Modern Concrete - Is it really more durable?
An often asked question is "Why does today's concrete not perform as well as traditional concrete used to?" In this opening topic the evolution of concrete is reviewed, so that the many changes in materials and practices that have taken place can be reviewed to reveal the most likely answer to the question.
What is High Performance Concrete and can anyone produce or achieve it?
Confusion often exists regarding the true meaning of High Performance Concrete and particularly regarding whether or not it can be satisfactorily produced using locally available materials and workers. In this topic, the technology is demystified, the benefits explained and the dangers highlighted.
Why low water/cement ratio is not always appropriate for durability
A low water cement ratio has almost always been considered a critical requirement for high strength and good durability - and usually this is true. However, this topic will explain why a low w/c ratio can sometimes be detrimental and why care is therefore required.
Why silica fume can be beneficial - but sometimes disastrous
Silica fume has been used commercially for many years and its benefits are well known. This topic will highlight these benefits, but also explain some lesser known concerns that could cause failures if not well understood and considered during construction and repair.
The epoxy coated rebar controversy explained
When it was introduced in the late 1970's, the use of epoxy coated rebar was hailed as the most effective way to avoid corrosion problems. Today many authorities are exploring alternatives - but the reasons are not widely publicized. This topic explains their concerns and the associated problems.
How clean should rebar be before concrete placement - are we missing the point?
Although most specifications require reinforcement to be free of deleterious materials at the time of concrete placement, many experts claim that bond between concrete and steel is improved by some surface rust. This topic reviews whether this claim can be justified - but also introduces other concerns that are often over-looked and are arguably more important than bond of concrete to steel.
How important is curing and how does it affect durability? Curing is arguably the single most influential practice that affects the achievement of durable concrete, but usually it receives the least amount of attention. This topic reviews good and bad practices and uses examples to illustrate the effects that these can have on cracking, strength, surface toughness, etc.
Producing and testing air entrained concrete - avoiding conflict
The benefits of air entrainment are well known and documented - but what effects do modern concrete materials have on the achievement of a satisfactory air void system? - and, are we adequately testing for it any way? This topic examines today's materials and practices and attempts to answer these questions using examples that suggest that this can be a controversial subject.
Surface Scaling - the causes de-mystified and avoidance reviewed
There are many similarities in appearance between the various forms of surface defects that can be described as scaling and confusion often prevents correct diagnosis and/or avoidance. In this topic, the various types are classified and the factors that cause them are identified in order that their occurrence - and the conflict that sometimes accompanies them - can be avoided.
Field Testing Concrete
Contractors and ready-mixed concrete producers can sometimes be unfairly penalized when incorrect concrete testing procedures are used - or data from the correct tests are incorrectly interpreted. This topic provides examples of how tests can sometimes evaluate the wrong parameter and it reviews the dangers of not performing tests in accordance with specified requirements.
Coatings, sealers or membranes - do they work and are they necessary?
This topic probably produces the most disagreement among experts, with many arguing that most protection systems are sensitive to application - or that they just don't provide adequate protection. Myths and mysteries are discussed under this topic, together with examples of past mistakes that have led to poor reputations for many types of systems.
Interactive Workshop Session
The seminar concludes with a session which provides for the exchange and sharing of views, opinions and experiences by participants.
Paul Jeffs, PJ Materials Consultants Limited
Paul Jeffs is an independent consultant who, for nearly 30 years, has specialized in providing technical advice and consulting services for the design, construction, restoration and protection of concrete and masonry structures - with particular emphasis on trouble-shooting. He has considerable experience with the investigation of concrete and masonry structures. Prior to forming PJ Materials Consultants Limited, he was employed for over 25 years within the construction industry around the world. Paul has served on the Canadian Standards Association Technical Committee (Associate) and the High Performance Sub-Committee for New Parking Structures (CAN/CSA S-413); he also served on the CSA 266 series of Admixture standards, and is a past director of the Concrete Restoration Association of Ontario. He served as a member of the Technical Advisory Committee to the Ontario Ministry of Housing for the deterioration and repair of existing parking structures, he was a member of the Ontario Ministry of Transportation technical advisory committee for the development of restoration standards and is a member of the National Research Council's Working Group on Repointing Mortars. He has provided materials related expertise as a consultant for numerous industries and has authored many technical papers.
Paul provides courses across Canada on such topics as durable concrete mix design and construction, concrete and masonry structure condition assessments, concrete repair and protection, the restoration of heritage and masonry structures and the design and construction of concrete slabs on grade. He has also regularly presented public and in-house courses in the Middle East. Paul has been a guest lecturer for several Canadian universities, the Canadian Society for Civil Engineering, the Canadian Dam Association, a speaker at many conferences and has authored or co-authored numerous technical articles.