DYNAMIC RHEOLOGICAL PROPERTIES OF FRESH CONCRETE WITH CHEMICAL ADMIXTURES . ADMIXTURES FOR CONCRETE: IMPROVEMENT OF PROPERTIES. PROCEEDINGS OF THE INTERNATIONAL SYMPOSIUM HELD BY RILEM (THE INTERNATIONAL UNION OF TESTING AND RESEARCH LABORATORIES FOR MATERIALS AND STRUCTURES), BARCELONA, MAY 14-17, 1990

A basic experimental investigation was carried out in order to obtain an effective and rational method for consolidating fresh concrete with chemical admixtures by using a vibrator. The rheological properties of fresh concrete during vibration were examined experimentally. Three types of fresh concrete mix which contains a superplasticizer (sulphonated naphthalene formaldehyde condensated base), an air entraining agent (sodium abietate) and a segregation controlling admixture (hydroxyethylcellulose base) were used in this study. A rotating fan type rheometer and a pulse wave propagation rheometer were used to obtain the dynamic rheological properties of fresh concrete under vibration. Two types of vibrator, a table vibrator and an internal vibrator were used in the experiment. To obtain the properties of energy propagation produced by the vibrator, the wave form which propagated in fresh concrete was measured. The flow curves of concrete with admixtures were no longer the Bingham relationship when it was vibrated, but they can be approximated as a Newtonian or quasiviscous fluid. The effect of admixture under vibration could be, therefore, estimated by rheological properties such as coefficient of viscosity or non-Newtonian power number. There was apparent difference in the wave spectrum of the above mixes. (Author/TRRL)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0412374102
• Corporate Authors:

  Chapman and Hall Limited

  11 New Fetter Lane
  London,   England 
• Authors:
  • Kakuta, S
  • Kojima, T
• Publication Date: 1990

Language

• English

Media Info

• Features: References;
• Pagination: p. 20-33
• Serial:
  • Publication of: Chapman and Hall
  • Publisher: Chapman and Hall Limited

Subject/Index Terms

• TRT Terms: Admixtures; Air entraining agents; Concrete; Conferences; Dynamics; Physical properties; Rheological properties; Vibration
• Uncontrolled Terms: Concrete properties; Dynamic characteristics
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00612190
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• ISBN: 0-412-37410-2
• Files: ITRD, TRIS
• Created Date: Aug 31 1991 12:00AM