STUDIES OF THE EFFECT OF SIMPLE ORGANIC ADMIXTURES ON THE PROPERTIES OF CEMENT PASTE
CEMENT PASTES HAVE BEEN MADE WITH THIRTEEN DIFFERENT ORGANIC CALCIUM SALTS DISSOLVED IN THE MIXING WATER. AIR CONTENT, WATER SEPARATION, AND SETTING TIME HAVE BEEN DETERMINED FOR FRESH PASTES; AMOUNT OF BOUND WATER, HEAT OF HYDRATION, YOUNG'S MODULUS, COMPRESSIVE STRENGTH, AND SHRINKAGE FOR HARDENED PASTES. AIR CONTENT WAS LOW IN ALL CASES, ALTHOUGH SLIGHTLY RAISED BY CALCIUM CAPROATE AND BENZOATE. WATER SEPARATION AFTER TWO HOURS WAS RELATIVELY UNAFFECTED, BUT INCREASED SOMEWHAT FOR GALACTONATE AND GLUCONATE, PERHAPS DUE TO THEIR STRONG RETARDING EFFECT. ALL EXCEPT ONE ADMIXTURE RETARDED THE SETTING, THE DELAY BEING RELATED TO THE TYPE OF MOLECULE ADDED IN SUCH A WAY AS TO SUGGEST THAT RETARDATION IS DUE TO ADSORPTION OF THE MOLECULES ON THE CEMENT GRAINS, AS PROPOSED BY W.C. HANSEN AND OTHERS. FOR MATURE PASTES, THE AMOUNT OF BOUND WATER AND HEAT OF HYDRATION WERE NOT MUCH MODIFIED, EXCEPT THAT LACTATE INCREASED THE HYDRATION SLIGHTLY. YOUNG'S MODULUS AND COMPRESSIVE STRENGTH WERE UNAFFECTED OR SLIGHTLY LOWERED. THE SHRINKAGE IN AN ATMOSPHERE OF 60 PER CENT R.H WAS INCREASED SIGNIFICANTLY BY SEVERAL ADMIXTURES AND AT 28 DAYS THE HIGHEST SHRINKAGE WAS OBTAINED FOR BENZOATE AND SALICYLATE, THE ONLY TWO AROMATIC SALTS TESTED. /LCPC/A/RRL/
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Supplemental Notes:
- Topic 2, RePORT II/4 PP 57-68, 3 TAB, 9 REF
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Authors:
- Danielsson, U
- Conference:
- Publication Date: 1967
Subject/Index Terms
- TRT Terms: Admixtures; Air content; Calcium; Cement; Compressive strength; Heat of hydration; Hygroscopic coefficient; Mixing; Modulus of elasticity; Pastes; Properties of materials; Salts; Setting (Concrete); Shrinkage; Water
- Uncontrolled Terms: Setting time
- Old TRIS Terms: Hygroscopic water
- Subject Areas: Highways; Materials;
Filing Info
- Accession Number: 00212769
- Record Type: Publication
- Source Agency: Road Research Laboratory /UK
- Files: TRIS
- Created Date: Jun 22 1970 12:00AM