ON THE COMPUTATION OF THERMAL STRESS DUE TO HEAT OF HYDRATION

A METHOD OF COMPUTING THERMAL STRESS DUE TO HEAT OF HYDRATION IN A CONCRETE IS PRESENTED. NEW CONCRETE IN CONTACT WITH OLD CONCRETE WILL BE AFFECTED BY TEMPERATURE RISE DUE TO HEAT GENERATED BY HYDRATION OF CEMENT. A RESTRAINT OF OLD CONCRETE AT A CONSTRUCTION JOINT WILL PREVENT A FREE THERMAL DEFORMATION OF THE NEW CONCRETE, AND CAUSE THERMAL STRESSES IN THE NEIGHBORHOOD OF THE CONSTRUCTON JOINT AND THERMAL CRACKS IN THE NEW CONCRETE. THIS STUDY DEALS WITH THERMAL STRESSES OF THIS NATURE. FACTORS, SUCH AS INCREASE IN MODULUS OF ELASTICITY OF CONCRETE OVER A PERIOD OF TIME AND RELAXATION OF STRESS DUE TO PLASTICITY OF THE NEW CONCRETE ARE TAKEN INTO ACCOUNT. A COMPUTER CALCULATION OF THERMAL STRESS IS PERFORMED BY SOLVING NUMERICALLY AIRY'S STRESS FUNCTION. AN EXAMPLE OF VARIATIONS IN THERMAL STRESS OVER A PERIOD OF TIME USING TEMPERATURE RECORDED AT AN ACTUAL JOB SITE IS GIVEN.

• Corporate Authors:

  Kajima Inst Constr Tech /Japan

  ,    
• Authors:
  • Nojiri, Y
  • Ganbara, Y
  • Murayama, Y
• Publication Date: 1969

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 9-17
• Serial:
  • Publication of: Cemento /Italy/
  • Publisher: Cemento /Italy

Subject/Index Terms

• TRT Terms: Computers; Concrete; Construction joints; Cracking; Heat of hydration; Mechanical relaxation; Modulus of elasticity; Plasticity; Thermal stresses
• Uncontrolled Terms: Concrete cracking
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00214347
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Files: TRIS
• Created Date: Sep 25 1972 12:00AM