Rheology of cement based particle suspensions

Document Sample
Rheology of cement based particle suspensions Powered By Docstoc
					                                                                                                         Rheology of cement based
                                                                                                            particle suspensions
Uitgave van Forum, verschijnt wekelijks (niet in juli), XXX 2004, afgiftekantoor Antwerpen X, P409562




                                                                                                        such as cement paste, mortar and concrete
VU: Hans Romaen, Technologisch Instituut vzw, Desguinlei 214, 2018 Antwerpen 1




                                                                                                                      October 7 and 8, 2004
                                                                                                                     BBRI, Limelette, Belgium


                                                                                                                       DR. WALLEVIK
                                                                                                                   RHEOLOGY COURSE


                                                                                                                                                TECHNOLOGISCH INSTITUUT
                                                                                                                                                Section on Civil Engineering
Rheology of cement based particle suspensions
such as cement paste, mortar and concrete

Introduction
   In the world of construction and concrete, self-compacting concrete (SCC) is beyond any doubt the
   most important innovation. The highly flowable concrete can be placed by its own weight without
   the need for extra consolidation. The SCC offers quite some opportunities for structures with very
   dense reinforcement or complex formwork because the homogeneity of the concrete can be
   guaranteed, independently from the casting process. Important extra advantages are the reduced
   manual labour, the shorter delivery times and the high surface quality.

   Some of the most critical problems, like segregation, formwork pressure, etc. are influenced and can
   be controlled directly by the rheology of the fresh SCC. As it is important to control the behavior of
   the fresh SCC, we invited prof. dr. ir. Wallevik to give an introduction course on concrete rheology
   and workability. The course will be given at the research centre of the BBRI.

   ir. Niki Cauberg, BBRI                                ir. Etienne Hemerijckx
   ir. Jan Desmyter, BBRI                                Chairman of the section
   Scientific Coordinators                               Civil Engineering
   Technological Advisors

General
   Rheology is by definition the science of flow and deformation of matter. So to describe the
   workability of fresh concrete one should use rheological approach. But to be able to use the science
   of rheology one has to be able to evaluate the rheological properties of the material. This has been
   a big problem in the science of concrete technology.
   Since Powers and Wiler introduced their plastometer in 1941, several attempts have been made to
   take a more basic approach to the testing of fresh concrete properties. Most of these attempts,
   however, have only resulted in various types of prototype equipment. Consequently, the most
   common way of testing fresh concrete properties is still based on various types of empirical test
   methods, such as the slump method introduced by Abrams in 1918.
   It was a great step forward, therefore, when Tattersall introduced his two-point test apparatus for
   measuring concrete workability in 1973.
   Since then, the concrete technology has gradually introduced the use of rheological approach.

Target group
  The course is designed for those in industry, university or research institution, who work with
  problems related to fresh concrete properties and/or others cement based particle suspensions such as
  cement paste, grout, repair materials, mortar, for instance self levelling flooring grout.

Objective
  The purpose of this course is to give a broad introduction of the basics in rheology of coarse
  particle suspensions with a main focus on fresh concrete and practical application of it. Also, to
  give an introduction to coagulation rate process to explain the mechanism which controls the
  workability loss.
The lecturer
     Dr. Olafur H. Wallevik has worked with the rheology of concrete and other cement based
     particle suspensions since he finished his master thesis on that theme at the Norwegian
     Institute of Technology in 1983. In the year 1987 he made the first version of the BML
     Viscometer which now is purchased throughout the world. He received his doctor degree in
     rheology from the same university in 1990.
     His special fields are Rheology of Fresh Concrete, High Performance Concrete, High Strength
     Concrete, Self-Compacting Concrete and Microstructures.
     He is the head of the concrete division at The Icelandic Building Research Institute (IBRI,
     http://www.rabygg.is, also member of the ENBRI) and the manager of the ConTec Ltd., one of
     the leading firms in producing viscometers for coarse particle suspensions. Among others, he is
     the former vice president of the Nordic Rheology Society and former chairman of the scientific
     commission in the Nordic Concrete Federation.


Course content
        The course will be divided into three parts:                 The main emphasis will be given to
        basic rheology, concrete rheology and                        rheology of concrete and mortars. Some
        coagulation/workability loss mechanism.                      practical examples will be given to
        Following are some keywords for the basic                    illuminate the theory. Some keywords are:
        part:
                                                                        • Effect of water
            • Basic terms                                               • Effect of cement
            • Models                                                    • Effect of admixtures
            • Bingham model                                             • Effect of pozzolans
            • Volume concentration of particles                         • Effect of grinding aid
            • Thixotropy                                                • Effect of aggregates
            • Viscosimetry                                              • Special concrete (HPC, HSC, SCC ..)
            • Equilibrium stress                                        • Practical application
            • General equation
            • Workability loss                                       Development of SCC is an ideal
                                                                     rheological problem.



Time schedule: Thursday 7 and Friday 8 October 2004
        Time                                Thursday                        Friday
        9:15-10:00                          Intro*                          Advanced theory
        10:15-11:00                         Introduction                    workability loss
        11:15-12:00                         Basic models                    HPC, HSC, SCC
        12:00-13:15                         Lunch                           Lunch
        13:15-14:00                         Basics (concrete)               The new generation SP
        14:15-15:00                         Cement, pozzolanes,...          Practical application
        15:15-16:00                         SP, Air,...                     Examples
        16:15-17:00                         Practical application           Conclusion*

        Note: The schedule is subject to changes
        * Intro and conclusion by guest speakers of two Belgian Universities:
        Prof. dr. ir. Geert De Schutter (Labo Magnel voor Betononderzoek, Universiteit Gent)
        Prof. dr. ir. Lucie Vandewalle (Dept. Burgerlijke Bouwkunde, K.U. Leuven)
        All lectures are held in English.
 General information
                                    Date
                                             October 7 and 8, 2004

                                    Venue
                                             Belgian Building Research Institute (BBRI)
                                             Avenue P. Holoffe 21
                                             B- 1342 Limelette
                                             Belgium
                                             Tel. : 02 655 77 11
                                             Route : http://www.wtcb.be/homepage/index.cfm?cat=contact



                                    Registration
                                             Preferably before September 28, 2004 by returning the
                                             enclosed registration form to Technologisch Instituut vzw.

                                    Registration fee
                                         ❏   € 575
                 SECRETARIATE            ❏   € 435 for members TI - K VIV - WTCB - BBG/GBB
           Technologisch Instituut vzw
                                         ❏   € 335 for academics/ civil servants who are also member of
                Ingenieurshuis - K VIV
                                                      TI – K VIV and PhD-students
Ms. Christine Mortelmans, coordinator
                        Desguinlei 214   Excl. 21 % VAT.
                   2018 Antwerpen 1
                   Tel. : 03 260 08 40       This fee includes participation to the full program, list of
                   Fax : 03 216 06 89        participants, lunches and coffee breaks. Participants will receive
                                             the compendium – booklet (about 150 pages).
                             E-MAIL :        Payments are to be made on receipt of the invoice. Cancellation is
      christine.mortelmans@ti.kviv.be        possible until 1 week before the date of the seminar in which case
                                             25 % of the registration fee will be charged. In case of cancellation
              www.ti.kviv.be                 during that week the full amount is due.
                                             Replacement of the person registered is possible.
                        CIVT/4AKC/ZVB


                                                                Training cheques
                                                                TI-Technologisch Instituut is a training and education center,
                                                                recognized by the Government of Flanders. This entails that
                                                                we can also accept the training cheques as a means of
                                                                payment. For more information, please go to :
                                                                www.vlaanderen.be/opleidingscheques

				
DOCUMENT INFO
Shared By:
Categories:
Tags:
Stats:
views:10
posted:5/17/2011
language:English
pages:4