EFFECTIVENESS OF MEMBRANE CURING ON CONCRETE SURFACES

THE DATA OBTAINED FOR THIS RESEARCH WERE TAKEN FROM 19 SIDEWALK-SIZED TEST SLABS (26 BY 24 BY 8 IN. THICK). VARIABLES INVESTIGATED INCLUDED THREE ENVIRONMENTS (73 F AND 25 PERCENT RH, 100 F AND 30 PERCENT RH, AND 140 F AND 25 PERCENT RH), FOUR CURING METHODS (WHITE PIGMENTED CURING COMPOUND, WATER-SOLUBLE LINSEED OIL, AND NO CURING COMPOUND), AND THREE WIND VELOCITIES (0, 8 TO 10, AND 18 TO 20 MPH). CONSTANTS INCLUDED MIX DESIGN (5 SACKS PER CUBIC YARD OF CONCRETE), MIXING TEMPERATURE, MIXING PROCEDURE, PLACEMENT, FINISH, AND CURE TIME. IN ALL CASES ADEQUATE STRENGTHS WERE OBTAINED, BUT CURING TEMPERATURES OF MORE THAN 100 F RESULTED IN A SIGNIFICANT REDUCTION IN THE STRENGTH OF THE TOP PORTION OF ALL CONCRETE SLABS, EVEN THOUGH ADEQUATE CURING METHODS WERE USED. AT TEMPERATURES OF MORE THAN 100 F, THE SURFACES CURED WITH THE COMBINATION MONOMOLECULAR FILM (ONE APPLICATION BEFORE FINAL FINISH) FOLLOWED BY WHITE PIGMENTED COMPOUND SHOWED A HIGH ABRASION LOSS COMPARED TO THE SURFACES CURED WITH EITHER WATER-SOLUBLE LINSEED OIL OR WHITE PIGMENTED COMPOUND BY ITSELF. THUS, THERE APPEAR TO BE NO SURFACE STRENGTH BENEFITS FROM THE ONE APPLICATION OF THE FILM BEFORE FINISHING. EVAPORATION OF WATER FROM THE SURFACE OF THE SLABS WAS SIGNIFICANTLY RETARDED WITH THE USE OF ANY OF THE CURING COMPOUNDS. EVAPORATION RATES MEASURED EXPERIMENTALLY IN THIS STUDY DID NOT AGREE WITH THE VALUES PREDICATED BY THE PCA CHART, ESPECIALLY THE RATES WHEN WIND WAS PRESENT. THUS, THE VALIDITY OF A PORTION OF THE PCA CHART IS QUESTIONED.

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/hrr/1973/433/433-003.pdf
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0309021634
• Supplemental Notes:
  • Sponsored by Committee on Curing of Concrete. 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:
  • Wrbas, Ronald O
  • Ledbetter, William B
  • Meyer, Alvin H
• Conference:
  • 52nd Annual Meeting of the Highway Research Board
  • Location: Washington District of Columbia, United States
  • Date: 1973-1-22 to 1973-1-26
• Publication Date: 1973

Media Info

• Media Type: Print
• Features: Figures; References; Tables;
• Pagination: pp 22-34
• Monograph Title: Corrosion, concrete and quality control
• Serial:
  • Highway Research Record
  • Issue Number: 433
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Concrete; Concrete curing; Membrane curing; Strength of materials; Temperature; Velocity; Wind
• Old TRIS Terms: Wind velocity
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00214280
• Record Type: Publication
• ISBN: 0309021634
• Files: TRIS, TRB
• Created Date: Dec 22 1973 12:00AM