HYDRAULIC PRESSURE IN CONCRETE

HYDRAULIC PRESSURE IS CONSIDERED IN THE PORES OF CONCRETE. HARDENED CEMENT PASTE IN A MODERN CONCRETE DAM CONSTITUTES 15 TO 20 PERCENT OF THE VOLUME OF CONCRETE. THE POROSITY OF THE CEMENT GEL IS ABOUT 25 PERCENT, AND THE WETTABLE AREA OF THE GEL PARTICLES IS ESTIMATED AT 99.8 PERCENT. THE CONCEPT OF NEGATIVE PRESSURES IN UNSATURATED REGIONS IN CONCRETE IS DISCUSSED. AFTER A PERIOD OF SEVERAL YEARS A PRACTICALLY STEADY STATE SHOULD BE REACHED WHEREIN POSITIVE PRESSURES IN CONCRETE ARE FOUND NEAR THE UPSTREAM FACE AND NEAR THE TAIL WATER LEVEL. IN THE REST OF THE STRUCTURE, CONCRETE SHOULD REMAIN UNSATURATED AND HYDROSTATIC PRESSURES SHOULD BE NEGATIVE. /PCA/

• Authors:
  • Powers, T C
• Publication Date: 0

Media Info

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

Subject/Index Terms

• TRT Terms: Cement; Concrete dams; Concrete hardening; Gels; Hydraulics; Hydrostatic pressure; Pastes; Pores; Porosity; Steady state
• Uncontrolled Terms: Hardened concrete; Pores
• Old TRIS Terms: Negative pressures
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00213512
• Record Type: Publication
• Source Agency: Portland Cement Association
• Report/Paper Numbers: No 63
• Files: TRIS
• Created Date: May 25 1970 12:00AM