CEMENT HYDRATION IN HEAT TREATMENT. PART 1

THE EFFECT OF HEAT TREATMENT UPON THE HYDRATION BEHAVIOUR OF CEMENT, THE INCREASE IN COMPRESSIVE AND TENSILE STRENGTH, THE HARDNESS AND THE DYNAMIC MODULUS OF ELASTICITY OF THE HARDENED CEMENT PASTE WHICH IS FORMED WAS STUDIED. RAISING THE TEMPERATURE DID, INDEED, ACCELERATE THE RATE OF HYDRATION AT THE START OF THE HYDRATION PROCESS, BUT CONSIDERABLY REDUCED IT IN THE SUBSEQUENT COURSE OF HYDRATION. AT THE START OF THE HYDRATION PROCESS THE VALUES OF THE COMPRESSIVE AND TENSILE STRENGTH, THE HARDNESS AND THE MODULUS OF ELASTICITY FOR THE HEAT-TREATED SPECIMENS INCREASED MORE THAN DID THE CORRESPONDING VALUES FOR THE SPECIMENS WHICH HAD HYDRATED AT NORMAL TEMPERATURE. WITH THE FURTHER PASSAGE OF TIME THESE VALUES UNDERWENT ONLY SOME ALTERNATE INCREASE AND DECREASE IN THE CASE OF THE HEAT- TREATED SPECIMENS, WHEREAS THEY CONTINUED TO INCREASE IN THE SPECIMENS WHICH HAD HYDRATED UNDER NORMAL CONDITIONS. IT WAS FOUND THAT THE QUOTIENT OF STRENGTH TO CONTENT OF COMBINED WATER FOR THE HEAT-TREATED SPECIMENS WAS SYSTEMATICALLY LOWER THAN FOR THE CORRESPONDING SPECIMENS HYDRATED AT 20 DEGREES C. THIS FACT INDICATES THAT HEAT TREATMENT DOES NOT MERELY ACCELERATE THE HYDRATION PROCESS, BUT ALSO HAS A QUALITATIVE EFFECT ON THE STRUCTURE OF THE HARDENED CEMENT PASTE THAT IS FORMED. GENERALLY SPEAKING, THE EFFECT OF THE RAISED TEMPERATURE UPON THE TECHNICALLY IMPORTANT PROPERTIES OF THE HARDENED CEMENT PASTE MUST BE CONSIDERED UNFAVOURABLE, THE HIGHER STRENGTHS OBTAINED AT THE BEGINNING OF THE HYDRATION PROCESS BEING MERELY THE RESULT OF A DISPROPORTIONATELY INCREASED DEGREE OF HYDRATION OF THE CEMENT. /AUTHOR/

• Supplemental Notes:
  • Vol 19, No 6, PP 276-281
• Authors:
  • Odler, I
  • Gebaver, J
• Publication Date: 1966-6

Media Info

• Serial:
  • Zement-Kalk-Gips

Subject/Index Terms

• TRT Terms: Cement; Compressive strength; Dynamic modulus of elasticity; Hardness; Hydration; Metal heating; Quality control; Tensile strength
• Uncontrolled Terms: Heat treatment; Quality
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00212498
• Record Type: Publication
• Files: TRIS
• Created Date: Aug 12 1970 12:00AM