YOUNG'S MODULUS, CREEP, AND SHRINKAGE OF GAP-GRADED CONCRETE VERSUS CONTINOUSLY GRADED CONCRETE

THIS PAPER PRESENTS EXPERIMENTAL RESULTS VERIFYING THE AUTHORS' PREVIOUS HYPOTHESIS THAT GAP-GRADED AIR-ENTRAINED CONCRETE HAS HIGHER YOUNG'S MODULUS OF ELASTICITY IN COMPRESSION, LESS SHRINKAGE, AND LESS CREEP THAN ITS CONTINUOUSLY GRADED COUNTERPART OF THE SAME MAXIMUM SIZE OF COARSE AGGREGATE AND SAME AMOUNT OF ENTRAINED AIR. THESE ATTRIBUTES ARE THE DIRECT RESULTS OF LESS SPECIFIC SURFACE IN GAP GRADING, COMPARED TO THAT IN CONTINUOUS GRADING, REQUIRING LESS WATER--CEMENT RATIO, LESS CEMENT, LESS WATER, LESS MATRIX, AND HIGHER AGGREGATE--MATRIX RATIO. THE INAPPLICABILITY OF EXISTING EQUATIONS FOR GAP-GRADED CONCRETE IS SHOWN, AND NEW MATHEMATICAL RELATIONSHIPS ARE DERIVED FOR MODULUS OF ELASTICITY AND CREEP FOR BOTH GAP- GRADED AND CONTINUOUSLY GRADED CONCRETES. THE EQUATIONS ARE FURTHER COMPARED WITH OTHER EXISTING RESULTS FOR GAP-GRADED CONCRETE. /AUTHOR/

• Record URL:
  http://onlinepubs.trb.org/Onlinepubs/hrr/1970/324/324-006.pdf
• Supplemental Notes:
  • Paper sponsored by Committee on Mechanical Properties of Concrete and presented at the 49th Annual Meeting. 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:
  • Li, Shu-T'ien
  • Ramakrishnan, V
• Publication Date: 1970

Media Info

• Media Type: Print
• Features: Figures; References; Tables;
• Pagination: pp 77-88
• Monograph Title: Symposium on concrete deformation
• Serial:
  • Highway Research Record
  • Issue Number: 324
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Aggregate gradation; Air entrained concrete; Compression; Compression tests; Concrete; Creep; Deformation; Entrained air; Gap grading; Loads; Mathematical analysis; Modulus of elasticity; Shrinkage; Testing; Water cement ratio
• Old TRIS Terms: Compressive strength tests; Concrete creep; Concrete shrinkage; Continuous grading; Grading (By size)
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00213846
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Apr 25 1971 12:00AM