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UWM-CBU Concrete Materials Technology Series Program No. 48 

Workshop and Field Demonstration for the Use of Flowable Slurry Containing Coal Ash, Fine Crushed Sand, and other Recyclable Products
Sponsored by
UWM Center for By-Products Utilization, Milwaukee, WI
Illinois Clean Coal Institute, Carterville, IL
Rockford Sand and Gravel, Inc., Rockford, IL
Rockford Blacktop Construction Company, Rockford, IL
Co-Sponsored by 
American Coal Ash Association and Wisconsin Electric Power Company
June 20, 2001, Rockford, IL


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 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.  The strength of this material can vary from 50 psi to 1200 psi at the age of 28 days.  It is being specified increasingly by municipalities, state highway departments, and engineers for may applications.

The workshop will present case histories of successful installations.  It would include a demonstration of slurry production, placement and old slurry excavation.  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, marketing, and using flowable slurry will present state-of-the-art information.


 8:00 a.m.

12:00 p.m.



Welcome and Introduction
M. W. Rafferty, President, Rockford Sand and Gravel, Inc., and Rockford Blacktop Construction Company
What is flowable slurry (a.k.a. CLSM), Engineering properties and mixture proportions of flowable slurry made with coal ash, fine crushed sand, used foundry sand, wood ash, crushed glass, on-site excavated materials, etc. (physical & chemical properties, strength, shrinkage, permeability, typical mixtures, etc.)
Tarun Naik
Field applications of flowable slurry in backfilling of excavations, trenched, and underground voids.  Effect of mixture proportions on setting characteristics and placement, thermal and electrical resisrivity properties, field performance, economy, and marketing.
Victor H. Smith
Adjourn to the demonstration location.
Field Demonstration: Slurry placement, hardening and settlement process, etc.
Tarun R. Naik and M. W. Rafferty
Tarun R. Naik, Ph. D., P. E., 
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 resulting in over 250 technical reports and papers in ACI, ASCE, ASTN, RILEM, ect.  He is a member of ACI, ASCE, ASEE, ASTM, RILEM, NSPE, and WSPE.  He is also a member of technical committees of ACI, ASCE, ASTM, AND RILEM.  He has served as a president of WI-ACI, WSPE and other organization.
Victor H. Smith
Director, of Technical Services, RMC Ewell Industries, Tampa, Florida
Mr. Smith is a past president of ACI-Florida and a member of several ACI technical committees including committee 229 on CLSM.  He holds many certificates related to the concrete construction industry such as master Certificate  in Concrete Materials.

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