FIELD AND LABORATORY STUDIES OF THE SULPHATE RESISTANCE OF CONCRETE

ANALYSES OF RESULTS FROM SULFATE AND SEA WATER EXPOSURES OF THE LONG-TIME STUDY REVEAL THAT, IN ADDITION TO A LOW TRICALCIUM ALUMINATE A CONTENT IN THE CEMENT, A HIGH CEMENT CONTENT AND A LOW PERMEABILITY OF THE CONCRETE ARE IMPORTANT FACTORS IN IMPROVING THE RESISTANCE TO SULFATE ATTACK. POZZOLANIC REPLACEMENT OF CEMENT GAVE IMPROVED RESISTANCE ONLY IN LEAN MIXES CONTAINING TYPE I CEMENTS. AIR ENTRAINMENT IMPROVED THE RESISTANCE OF THE CONCRETE BY REDUCING THE WATER-CEMENT RATIO AND HENCE DECREASING THE PERMEABILITY. IN A SEA WATER EXPOSURE, THE REACTION PRODUCT OF TRICALCIUM ALUMINATE WITH CHLORIDES ENTERING THE CONCRETE REDUCED THE PERMEABILITY SUFFICIENTLY TO AID IN PROTECTING REINFORCING STEEL FROM CORROSION. THE TRICALCIUM SILICATE CONTENT OF THE CEMENT AFFECTS PERMEABILITY BY INFLUENCING BOTH THE RATE OF HYDRATION OF THE CEMENT AND ALSO THE POROSITY OF THE HYDRATED PASTE. /PCA/

• Authors:
  • Verbeck, G J
• Publication Date: 0

Media Info

• Serial:
  • Portland Cement Assoc R & D Lab Bull
  • Issue Number: 0

Subject/Index Terms

• TRT Terms: Air entrainment; Aluminates; Calcium compounds; Cement content; Concrete; Field studies; Hydration; Laboratory studies; Permeability; Porosity; Seawater; Silicates; Sulfate resisting cement; Water cement ratio
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00213659
• Record Type: Publication
• Source Agency: Portland Cement Association
• Report/Paper Numbers: No 227
• Files: TRIS
• Created Date: Jun 1 1970 12:00AM