mkoadno

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mkoadno

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Presented by: Ken Day, Australia  (BIO)
Time: 3:00 pm EST │ 1.5 hours duration
Pricing: $50 (Members & Non-Members)

Webinar Description:

Reducing variability through improved QC/QA can be a very productive approach for the concrete producer. This webinar begins by addressing the “Gold in the Mine”, Professor J.M. Juran’s term for the financial saving available from improved control. The best achievable standard deviation of strength can be as low as 200-250psi; if your standard deviation is much higher there is room for improving quality and reaping its benefits by lowering the average design strength.

Limiting general variability is one aspect of QC, but most trouble usually arises when some factor causes a drop in mean strength. Early detection of such drops, known as “change points” is an important factor in avoiding penalization and, by leading to the detection of the cause, in reducing general durability.

There are dozens of potential causes of reduced strength/quality and the important ones are not necessarily the same in different organizations and situations. It is important to establish which factors are involved in your situation and to concentrate on their elimination or reduction.

This Webinar aims at making attendees aware of some of the common causes of variability and showing them how to analyze their test data for early detection and identification of problems. A free program is provided into which an XL spreadsheet of your past data can be entered without re-typing, to
illustrate the mechanism and potential of the technique.

Presenter Bio:

Ken Day is a world-renowned expert on concrete quality control. Ken began, straight out of university in the early 1950s (and without even a hand calculator), by originating a graphical and statistical control system for precast, prestressed, concrete required to attain 9,800psi at 18hrs. He achieved a consistent SD of under 300psi at 28days using cubes personally cast and tested.
 

In 1975 he added Cusum analysis to the system offered by his own independent laboratory to premix suppliers in Australia. In the mid 1980s, he computerized his system as a Lotus 123 spreadsheet, working with the Australian Govt. Airfield Construction organization, and published a series of 8 articles on it in Concrete International. The system was then incorporated in a compiled computer program by his son Peter, and marketed internationally by his own company Concrete Advice Pty Ltd. It was used by his younger son, John, to control concrete production for Petronas Towers, at that time the world’s tallest building, and an SD of 450psi was attained on the last 200 results in the grade averaging over 14,000psi on that project.

Ken’s CV and many other details are available on his website, www.kenday.id.au.
 

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