EFFECT OF THE SHRINKAGE STRESS ON THE CREEP OF HARDENED CEMENT PASTE

A FORMULA IS GIVEN BY MEANS OF WHICH THE CREEP RATE OF THE HARDENED CEMENT PASTE AT A PARTICULAR TIME CAN BE CALCULATED FROM THE SUM OF THE EXTERNALLY APPLIED STRESS AND THE SHRINKAGE STRESS PRODUCED BY SIMULTANEOUS DRYING. THE EQUATION IS COMPARED WITH THE RESULTS OF MEASUREMENTS PERFORMED ON HARDENED CEMENT PAST WITH A WATER/CEMENT RATIO OF 0.3 AND 0.65 RESPECTIVELY. THE HYDRATION PERIOD BEFORE THE START OF TESTING WAS 28 DAYS. THE CREEP RATE WAS MEASURED FOR FIVE DIFFERENT EXTERNAL LOADS IN THE RANGE UP TO ONE-HALF OF THE FAILURE LOAD. THE CREEP RATE CAUSED BY THE SHRINKAGE STRESS WAS DETERMINED ON UNLOADED BUT DRYING SPECIMENS. THE CONSTANTS OF THE EQUATION STATED IN THE TEXT WERE DETERMINED IN EACH CASE FOR TWO DIFFERENT VALUES OF TIME AND WERE COMPARED WITH THE VALUES OBTAINED FROM THE MEASUREMENTS. WITHIN THE LIMITS OF THE ACCURACY OF MEASUREMENT, THE AGREEMENT CAN BE SAID TO BE SATISFACTORY. /AUTHOR/

• Supplemental Notes:
  • Vol 19, No 11, PP 528-530
• Authors:
  • Wittmann, F
• Publication Date: 0

Media Info

• Serial:
  • Zement-Kalk-Gips
  • Issue Number: 0

Subject/Index Terms

• TRT Terms: Cement; Concrete hardening; Creep; Drying; Formulas; Hardness; Measurement; Pastes; Shrinkage; Stresses; Water cement ratio
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00212511
• Record Type: Publication
• Files: TRIS
• Created Date: Sep 1 1970 12:00AM