EARLY CONTROL OF THE QUALITY OF CONCRETE AT THE LAYING STAGE. APPLICATION IN THE FACTORY AND ON CONSTRUCTION SITES

CONTROLE PRECOCE DE LA QUALITE DU BETON EN OEUVRE. APPLICATION EN USINE ET SUR CHANTIER

The author proposes a method of controlling the quality of young concrete products in the factory and in structures cast in situ. This two-part control consists in: (1) controlling the concrete, not only by strengthening the control of the ingredients, manufacturing equipment, laying methods and characteristics at an early age, but also in carrying out a strength test at 24 hours on samples cured under warm water at 60 degrees C. If this thermal treatment proves difficult to carry out, it can be replaced with a test at 48 hours without accelerated curing of the concrete but using the hydration heat of cement by utilizing moulds with insulated sides; (2) control of applied concrete by means of non-destructive tests at an early age: determination of the velocity of wave propagation and measurement of the surface hrdness with a sclerometer. These measurements are carried out on concrete elements at the time of removal of the formwork. The study highlighted the advantages of carrying out preliminary calibration operations specific to the mix design formula selected. (TRRL)

• Corporate Authors:

  National Research Laboratory for the Cement Indus

  46 rue Cesar Franck
  1050 Brussels,   Belgium 
• Authors:
  • Collet, I
• Publication Date: 1982

Language

• French

Media Info

• Features: Figures; Photos; References; Tables;
• Pagination: 36 p.

Subject/Index Terms

• TRT Terms: Calibration; Cast in place structures; Concrete; Concrete placing; Manufacturing; Mix design; Nondestructive tests; Quality control; Strength of materials; Temperature; Wave motion
• Uncontrolled Terms: Concrete strength
• ITRD Terms: 4781: Cast in situ concrete; 4755: Concrete; 3628: Construction site; 4750: Fresh concrete; 5914: Hardness; 6743: Heat; 3623: Laying; 4714: Mix design; 4792: Precast concrete; 3638: Prefabrication; 9063: Quality; 4711: Rapid hardening; 5544: Strength (mater); 6438: Surface; 9101: Surveillance; 6288: Test method; 6739: Ultrasonic
• Subject Areas: Construction; Highways; Materials;

Filing Info

• Accession Number: 00389897
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Report/Paper Numbers: RR CRIC 51
• Files: ITRD, TRIS
• Created Date: Nov 30 1984 12:00AM