EVALUATING EFFECTIVENESS OF CONCRETE CURING COMPOUNDS
A LABORATORY EXPERIMENT IS DESCRIBED IN WHICH CONCRETE SLAB SPECIMENS WERE CURED WITH APPLICATION RATES VARYING FROM NO COVERAGE TO 100 SQ FT/GAL IN A CONTROLLED ENVIRONMENT SIMULATING SEVERE SUMMER SXPOSURE. USING THE MONFORE HUMIDITY GAGE, THE RELATIVE HUMIDITY WAS DETERMINED AT VARYING DEPTHS IN THE SLABS AT TIMES UP TO 14 DAYS. SINCE HYDRATION VIRTUALLY CEASES WHEN THE INTERNAL RELATIVE HUMIDITY FALLS BELOW 80 PERCENT, THE LENGTH OF THE EFFECTIVE CURING TIME WAS ESTWBLSIHED FOR EACH DEPTH-COVERAGE COMBINATION. IT WAS FOUND THAT AS LONG AS A CONTINUOUS MEMBRANE IS FORMED, THE RATE OF APPLICATION OF THE CURING COMPOUND HAS LITTLE EFFECT ON CURING EFFECTIVENESS. IT WAS ALSO FOUND THAT 1 IN. BELOW THE MEMBRANE, THE HYDRATION PROCESS IS SUSTAINED THROUGHOUT THE 28-DAY CURING PERIOD INDEPENDENT OF THE THICKNESS OF THE MEMBRANE. HOWEVER, IT IS THIS UPPER 1 IN. THAT IS OF PRIMARY IMPORTANCE WITH RESPECT TO RIDING QUALITY, SAFETY, AND AESTHETICS. THEREFORE, TO AID INPSECTORS IN THE ASSURANCE THAT THE SURFACE OF A CONCRETE PAVEMENT IS BEING PROPERLY CURED, A RELATIVE HUMIDITY-INDICATING BUTTON HAS BEEN DEVELOPED FOR INSERTION INTO FRESH PAVEMENT SURFACES. /AUTHOR/
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Supplemental Notes:
- Vol 5, No 2, PP 294-302
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Corporate Authors:
American Society for Testing and Materials (ASTM)
100 Barr Harbor Drive, P.O. Box C700
West Conshohocken, PA United States 19428-2957 -
Authors:
- Carrier, R E
- Cady, P D
- Publication Date: 1970-6
Media Info
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Serial:
- Journal of Materials
- Publisher: American Society for Testing and Materials (ASTM)
Subject/Index Terms
- TRT Terms: Chemical compounds; Concrete curing; Concrete pavements; Curing agents; Humidity; Hydration; Measuring instruments; Slabs
- Old TRIS Terms: Compounds
- Subject Areas: Highways; Materials;
Filing Info
- Accession Number: 00213745
- Record Type: Publication
- Files: TRIS
- Created Date: Sep 21 1970 12:00AM