SHRINKAGE OF CONCRETE AND INFLUENCE OF ADMIXTURES ON SHRINKAGE

RETRACCION DEL HORMIGON E INFLUENCIA DE LOS ADITIVOS EN LA MISMA

The variables which determine the shrinkage of cement paste, and their influence on the shrinkage of concrete are examined. Among these variables may be mentioned: the fineness and quantity of the cement; the drying time; the water-cement ratio; the absorbtion of carbon dioxide from the air; the type of cement; the relative moisture content of the air; the aggregate content; and variations in moisture content. Among the additives employed to reduce shrinkage are included: volume-modifying agents, (expansive materials and shrinkage-resisting materials); surface-active agents, (lignosulphonates); setting retarders; water-reducing agents, (plasticisers, plasticiser/air-entrainers); chlorides, which counteract the expansive effect of gypsum; expansive additives; expansive cements, (sulfo-aluminous cement and its mixtures with portland or gypsum cements); oxidisable metallic powders, (iron in granular or powdered form); gas-generating agents, (gas-concrete and foamed concrete). Very recently, liquid curing compounds have been developed which, applied in pulverized form at the start of setting, prevent initial micro-cracking. /TRRL/

• Corporate Authors:

  Portavoz de la Agrupacion Nacional de Fabricantes

  Seccion Publicidad, Quinones 15-1
  Madrid 8,   Spain 
• Authors:
  • Ronda, J
• Publication Date: 1975-5

Language

• Spanish

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 15-33
• Serial:
  • Alemas
  • Issue Number: 82

Subject/Index Terms

• TRT Terms: Absorption; Admixtures; Aggregates; Carbon dioxide; Cement; Cement paste; Chlorides; Concrete; Concrete curing; Cracking; Drying rate; Expansive cement; Lignosulfonate; Moisture content; Plasticizers; Setting (Concrete); Shrinkage; Water; Water cement ratio
• Uncontrolled Terms: Concrete cracking
• Old TRIS Terms: Concrete shrinkage; Plasticizer (Concrete)
• ITRD Terms: 6758: Absorption; 4736: Admixture; 4758: Cement; 4755: Concrete; 4702: Curing (concrete); 4749: Expansive cement; 5920: Moisture content; 4725: Plasticizer; 4723: Setting (concrete); 4743: Shrinkage; 4355: Water
• Subject Areas: Geotechnology; Highways; Materials; Planning and Forecasting; I32: Concrete; I72: Traffic and Transport Planning;

Filing Info

• Accession Number: 00163161
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Report/Paper Numbers: Analytic
• Files: ITRD, TRIS
• Created Date: Feb 16 1978 12:00AM