THE BLEEDING OF PORTLAND CEMENT PASTE, MORTAR AND CONCRETE TREATED AS A SPECIAL CASE OF SEDIMENTATION

PART I DEALS WITH THE GENERAL ASPECTS AND FUNDAMENTAL CAUSE OF BLEEDING, AND THE LAWS WHICH GOVERN THE RATE AND AMOUNT OF ITS OCCURRENCE. BLEEDING IS SHOWN TO BE A PROCESS OF SUBSIDENCE OR SEDIMENTATION. THE RATE OF BLEEDING FOLLOWS A GENERAL LAW DERIVED FROM POISEUILLE'S LAW OF CAPILLARY FLOW. FACTORS AFFECTING BLEEDING CAPACITY ARE DISCUSSED. PART II CONCERNS PRACTICAL APPLICATION OF PRINCIPLES SET FORTH IN PART I. METHODS OF CONTROLLING THE BLEEDING RATE AND CAPACITY, THE EFFECT OF BOUNDARY FRICTION AND FORCED BLEEDING AND CAUSE OF CERTAIN TYPES OF SCALING ARE DISCUSSED. PART III DESCRIBES IN DETAIL A TECHNIQUE FOR MEASURING BLEEDING. THE REPORT INCLUDES APPENDIX A -- "A STUDY OF THE BASIS FOR SUBSTITUTION OF QUANTITIES PERTAINING TO GRANULAR BEDS IN EQUATION 3," BY L.A. DAHL. /PCA/

• Authors:
  • Powers, T C
  • Dahl, L A
• Publication Date: 0

Media Info

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

Subject/Index Terms

• TRT Terms: Bleeding; Capillarity; Measurement; Mortar; Pastes; Portland cement; Portland cement concrete; Sedimentation
• Uncontrolled Terms: Scaling
• Old TRIS Terms: Poiseuilles law
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00213454
• Record Type: Publication
• Source Agency: Portland Cement Association
• Report/Paper Numbers: No 2
• Files: TRIS
• Created Date: May 25 1970 12:00AM