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UWM-CBU Concrete Materials Technology Series Program No. 59 
Seminar and Construction Demonstration on the Use of Flowable Slurry Containing Coal Ash
Sponsored By
Illinois Clean Coal Institute, Carterville, IL and the UWM Center for By-Products Utilization, Milwaukee, WI
 Co-Sponsored By
Henry Nelch & Son, Co., Springfield, IL
July 31, 2003, Springfield, 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. 



8:30 a.m.

Registration (Continental Breakfast Included)


William Hoback, Chief,
Department of Commerce and Economic Opportunity, Office of Coal Development, Springfield, Illinois


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.

Victor H. Smith

12:15 p.m.

Lunch (included)


Illinois EPA and Illinois DOT Requirements.

Tarun R. Naik


Flowable Slurry Placement Demonstration and Questions and Answers

Rob Nelch 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, 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.  


Victor H. Smith
Quality Control Supervisor, Cemex USA, Tampa, Florida

Mr. Victor Smith has specialized in design and construction of value-added products in reinforced concrete buildings for over 25 years. He has extensive experience in high-strength concrete, testing, code development, investigation, teaching, and research & development. Mr. Smith is an active ACI member and serves on ACI 229, 305, and 332. He is a member of the Florida Concrete Products Association, USF-Engineering Advisory Board, Past Chair for Construction Materials Council, and Past-president, ACI-Suncoast.



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