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UWM-CBU Concrete Materials Technology Series Program No. 57 

Seminar on 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
Dynegy Midwest Generation, Inc., Decatur, IL
April 24, 2003, Marion, 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 Material, 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.  Flowable slurry is being specified increasingly by municipalities, state highway departments, and engineers 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 video-demonstration of slurry production, placement, and old slurry excavation 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)


Welcome and Introduction
Dr. FranÁois Botha, Project Manager, Illinois Clean Coal Institute


What is flowable slurry? -- Engineering properties and mixture proportions of flowable slurry (a.k.a. CLSM) made with coal ash.
Dr. Tarun 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. Addition of color to CLSM for safer excavation.
Frank A. Kozeliski


Lunch (Included)


Illinois EPA and DOT Requirements; and, Video Demonstration of slurry production, placement, old slurry excavation, hardening and settlement process, etc.
Tarun R. Naik


Question and Answers




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.  


Frank A. Kozeliski, P.E., FACI
President and Materials Engineer, Gallup Sand & Gravel Co. in Gallup, New Mexico

Mr. Kozeliski has been with the company since 1976.† He is an Examiner/Trainer for ACIís Field Technicians Certification and a past Instructor in the Construction Technology Department of the University of New Mexico, Gallup.† He is a founding member, past president, and past director of ACIís New Mexico chapter.† He is also a member of several technical and educational committees of ACI, including Committee 229 on CLSM (Flowable Slurry) and Chairman of Committee 211 (Mixture Proportions).



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