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UWM-CBU Concrete Materials Technology Series Program No. 58 
Seminar and Construction Demonstration on the Use of Flowable Slurry Containing Coal Ash
Sponsored By
Illinois Clean Coal Institute, Carterville, IL and UWM Center for By-Products Utilization, Milwaukee, WI
 Co-Sponsored By
Ozinga Chicago  RMC, Inc., Chicago, IL
May 20, 2003, Chicago, IL



Workshop Description

The purpose of the workshop is to present important technical information and review production and construction aspects for a new type of backfill material for trenches and other excavations, as well as for filling abandoned underground pipes, tunnels, etc.  Flowable Slurry (Controlled Low Strength Materials, or CLSM) is a low-strength concrete-like material that is made from one or more of the materials such as coal ash, fine crushed sand, used foundry sand, crushed glass, wood ash, regular concrete sand, water, and some portland cement.  Flowable slurry can be designed for future excavation.  The strength of this material can vary from 50 psi to 1200 psi at the age of 28 days.  Numerous municipalities, state highway departments, and engineers are specifying flowable slurry increasingly for many applications.  

The workshop will present case histories of successful installations.  Technical information will be presented on mixture design, mechanical properties, construction applications, and environmental regulations. A construction demonstration of slurry placement will also be presented.  Handout materials will be provided.  The workshop should be of interest to those associated with building design, engineers, architects, engineering technicians, engineers working in governmental agencies, industry and private practice, engineering faculty and students, as well as ready mixed concrete producers, sand and coarse aggregates suppliers, and contractors.  Knowledgeable professionals engaged in specifying, approving, producing, marketing, and using flowable slurry will present state-of-the-art information. 



8:00 a.m.

Registration (Continental Breakfast Included)


Dr. François Botha, Project Manager, Illinois Clean Coal Institute



Martin Ozinga IV


What is flowable slurry? - Engineering properties and mixture proportions of flowable slurry (a.k.a. CLSM) made with coal ash, case history, and construction applications.

Tarun R. Naik


Break (refreshments - included)


Field applications of flowable slurry in backfilling of excavations, trenches, and underground voids.  Effect of mixture proportions on setting characteristics, placement, testing, field performance, economy, and marketing.

Martin Ozinga IV

12:15 p.m.

Lunch (included)


Illinois EPA and Illinois DOT Requirements.

Tarun R. Naik


Flowable Slurry Placement Demonstration and Questions and Answers

Martin Ozinga IV and Tarun R. Naik




Tarun R. Naik, Ph. D., P. E., FACI
Director, UWM Center for By-Products Utilization, Milwaukee, Wisconsin

Dr. Naik has over 35 years of experience with cement, aggregates, and concrete.  His contribution in teaching and research has been well recognized nationally and internationally.   His research has resulted in over 250 technical reports and papers in ACI, ASCE, ASTM, RILEM, etc.  He is a member of ACI, ASCE, ASEE, ASTM, RILEM, NSPE, and WSPE.  He is a member of technical committees of ACI, ASCE, ASTM, and RILEM.  He has served as a president of WI-ACI, WSPE, and other organizations.  


Martin Ozinga IV
Vice President, Ozinga RMC, Inc. Chicago, IL

Mr. Martin Ozinga IV is part of the fourth generation of the family owned ready mixed concrete company, Ozinga Bros., Inc.  Marty has served as a dispatcher, yard manager, and is currently the Vice President of Ozinga Chicago RMC, Inc.  He is involved in environmental issues, special projects, and sales.  Marty also manages Chicago Cement, Inc., a subsidiary company of Ozinga that procures all cementitious products consumed by the Ozinga companies.  In addition, Chicago Cement is responsible for the fly ash management program of State Line Energy in Hammond, Indiana.




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