THE MCPHERSON TEST ROAD: TENTH-YEAR REPORT
DUE TO A LACK OF SUITABLE STONE, KANSAS IS COMPELLED TO USE SAND-GRAVEL AGGREGATES FOR CONCRETE, AND MUCH OF THE CONCRETE PRODUCED FROM THESE AGGREGATES IS SUBJECT TO MAP CRACKING. IN MOST CASES THIS CRACKING CAN BE MINIMIZED OR DELAYED BY THE ADDITION OF 30 PERCENT CRUSHED LIMESTONE, BUT THIS IS A COSTLY MATERIAL IN THE WESTERN TWO-THIRDS OF THE STATE. THE MCPHERSON TEST ROAD WAS BUILT IN 1949 TO DETERMINE IF LESS EXPENSIVE METHODS MIGHT PROVE TO BE AS EFFECTIVE. REPUBLICAN RIVER SAND-GRAVEL WAS USED AS A BASIC AGGREGATE IN THE TEST. THE BASIC TEST PATTERN CONSISTS OF ONE TEST SECTION USING THE BASIC AGGREGATE ALONE, ONE SECTION IN WHICH 30 PERCENT OF THE BASIC AGGREGATE WAS REPLACED WITH CRUSHED LIMESTONE, AND THREE SECTIONS USING THE BASIC AGGREGATE WITH A PORTION OF THE CEMENT REPLACED BY ONE OF THREE POZZOLANIC MATERIALS. THE BASIC PATTERN WAS REPEATED WITH FIVE BRANDS OF CEMENT, AND WITH AND WITHOUT AIR ENTRAINING. ALL CEMENTS WERE PURCHASED AS TYPE I, HOWEVER, ONE CEMENT MET TYPE II REQUIREMENTS. OVER A 10-YEAR PERIOD TESTS HAVE BEEN MADE OF FLEXURAL STRENGTH, EXTENT OF MAP AND OTHER CRACKING, DEPTH OF CRACK, THE TIME ELAPSED BEFORE THE CRACKING OCCURRED, AND THE SPEED WITH WHICH IT PROGRESSED. THE IMPORTANCE OF THE SEVERAL CRACK PATTERNS IS DISCUSSED IN RELATION TO MAINTENANCE-FREE PAVEMENT LIFE. FLEXURAL STRENGTH OF TEST BEAMS SHOWED MARKED SEASONAL VARIATIONS IN THE SECTIONS CONTAINING POZZOLANS, BUT IN GENERAL INCREASED THROUGH THE 10-YEAR PERIOD. TEST BEAMS REPRESENTING BASIC AGGREGATE SECTIONS DECLINED IN STRENGTH WITH ONLY MINOR SEASONAL VARIATIONS, EXCEPT THAT THE TYPE II CEMENT SECTION MAINTAINED ITS EARLY STRENGTH. THE SECTIONS WHICH INCLUDED CRUSHED LIMESTONE DID NOT FLUCTUATE MARKEDLY IN FLEXURAL STRENGTH AND SHOWED SMALL GAINS OVER THE 10 YEARS. TRANSVERSE AND LONGITUDINAL CRACKS APPEARED EARLIER AND WERE MORE EXTENSIVE IN SOME POZZOLAN SECTIONS, ALTHOUGH THE BASIC AGGREGATE SECTIONS WITH CONSIDERABLE EARLY CRACKING BECAME SO MAP CRACKED THAT STRUCTURAL CRACKS TENDED TO BE OBSCURED. /AUTHOR/
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Supplemental Notes:
- Vol 39, pp 191-204, 11 FIG, 3 TAB, 3 PHOT, 20 REF. 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.
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Authors:
- Stingley, W M
- McNeal, J D
- Peyton, R L
- Publication Date: 1960
Media Info
- Media Type: Digital/other
- Monograph Title: Proceedings of the Thirty-Ninth Annual Meeting of the Highway Research Board, Washington, D.C., January 11-15, 1960
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Serial:
- Highway Research Board Proceedings
- Volume: 39
- Publisher: Highway Research Board
Subject/Index Terms
- TRT Terms: Air entrainment; Beams; Cement; Concrete aggregates; Concrete pavements; Concrete tests; Crushed limestone; Experimental roads; Flexural strength; Pavement cracking; Pozzolan; Sandy gravels; Structural tests
- Subject Areas: Bridges and other structures; Highways; Pavements;
Filing Info
- Accession Number: 00207359
- Record Type: Publication
- Files: TRIS, TRB
- Created Date: Aug 29 2000 12:00AM