MICHIGAN'S EXPERIENCE IN THE USE OF WHITE-PIGMENTED MEMBRANE CURING COMPOUNDS

MICHIGAN, IN 1949, ADOPTED SPECIFICATIONS FOR WHITE-PIGMENTED CURING COMPOUNDS IN AN ATTEMPT TO MINIMIZE TEMPERATURE CRACKING IN CONCRETE PAVEMENTS BUILT DURING THE SPRING AND SUMMER MONTHS. PREVIOUS LABORATORY STUDIES AND FIELD TESTS DEMONSTRATED THE EFFECTIVENESS AND PRACTICABILITY OF THIS TYPE OF CURING. AT FIRST SOME DIFFICULTY WAS ENCOUNTERED IN APPLYING THE COMPOUND WITH THE SPRAYING EQUIPMENT THEN IN USE, WHICH LED TO A MODIFICATION OF PUMP DESIGN BY THE MANUFACTURER. IT WAS FOUND THAT MOST OPERATIONAL TROUBLES WERE CAUSED BY: (1) INADEQUATE STIRRING OF THE COMPOUND BEFORE AND DURING APPLICATION; AND (2) FAILURE TO CLEAN THE SPRAYING EQUIPMENT PROPERLY AFTER USE. WHITENESS AND HIDING POWER ARE IMPORTANT PROPERTIES OF WHITE-PIGMENTED COMPOUNDS. MICHIGAN SPECIFIED A MINIMUM APPARENT REFLECTANCE OF 70 PERCENT RELATIVE TO MAGNESIUM OXIDE FOR THE FORMER AND 100 SQ. FT. PER GAL. FOR THE LATTER. THE METHOD OF DETERMINING COLOR BY A SPECTROPHOTOMETER IS DESCRIBED AND DETAILS OF OTHER TESTS AND APPLICATION REQUIREMENTS ARE GIVEN IN THE MICHIGAN SPECIFICATIONS. /AUTHOR/

• Record URL:
  https://onlinepubs.trb.org/Onlinepubs/hrbproceedings/30/30-025.pdf
• Supplemental Notes:
  • Vol 30, pp 252-260, 1 TAB, 8 PHOT, 6 REF, 1 APP. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
• Authors:
  • Rhodes, C C
• Publication Date: 1951

Media Info

• Media Type: Digital/other
• Monograph Title: Proceedings of the Thirtieth Annual Meeting of the Highway Research Board Held at Washington, D.C., January 9-12, 1951
• Serial:
  • Highway Research Board Proceedings
  • Volume: 30
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Curing agents; Magnesium compounds; Membrane curing; Pavement cracking; Reflectivity; Spectrophotometers; Sprayers; Temperature
• Uncontrolled Terms: Reflectance
• Old TRIS Terms: White pigments
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00213949
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Jul 25 1971 12:00AM