STUDIES OF THE ACCELERATED SOUNDNESS TESTS

THE SODIUM AND MAGNESIUM SULFATE SOUNDNESS TESTS HAVE BEEN ACCUSED OF UNRELIABILITY BECAUSE OF DIFFICULTIES EXPERIENCED IN OBTAINING CHECK RESULTS BETWEEN SEVERAL LABORATORIES OR WITHIN ONE LABORATORY USING THE SAME MATERIALS AND TEST METHODS. THIS CONDITION JUSTIFIES A CRITICAL STUDY OF THE TEST TECHNIQUE. BEGINNING WITH THE THEORY OF THE TEST, ATTENTION IS GIVEN TO THE PREPARATION OF THE SULFATE SOLUTIONS AND THE SPECIMENS TO BE TESTED, AND THE CARE NECESSARY TO KEEP THE SOLUTIONS AT THEIR PROPER CONCENTRATIONS. NEW DATA ARE GIVEN FOR THE DISSOLUTION RATES OF THE HYDROUS AND THE ANHYDROUS FORMS OF BOTH SULFATES, TOGETHER WITH A REVIEW OF THE LITERATURE DEALING WITH THE SOLUBILITIES OF THESE SALTS. CRYSTALLOGRAPHIC DATA ARE ALSO GIVEN TO AID IN THE EASY IDENTIFICATION OF THE CRYSTAL FORMS WHICH MAY APPEAR UNDER THE CONDITIONS OF THE SOUNDNESS TEST. ILLUSTRATIONS ARE GIVEN SHOWING THE OBSERVED CRYSTALS AND THIN RATES OF GROWTH. SUCH FACTORS AS TIME OF DRYING, TEMPERATURE VARIATIONS, AGGREGATE CONTAINERS, ETC., ON THE CONSTANCY OF RESULTS ARE CONSIDERED, WITH SUPPORTING EVIDENCE. DISTILLED WATER AS AN IMMERSING FLUID IS COMPARED WITH SODIUM AND MAGNESIUM SULFATES. THE CONSTANCY OF CHECK DETERMINATIONS WITH MATERIALS FROM SEVERAL SOURCES IS SHOWN. THE INTERPRETATION OF THE PRESENT TEST IS DISCUSSED AND CERTAIN CHANGES ARE RECOMMENDED. THE TESTING OF FINE AND COARSE MINERAL AGGREGATES BY THE ACCELERATED SOUNDNESS METHODS IS DISCUSSED IN VIEW OF FIELD OBSERVATIONS AND OTHER ESTABLISHED FACTS. SEVERAL RECOMMENDATIONS ARE MADE WITH THE HOPE OF FIXING THE STATUS OF THE TEST. A BIBLIOGRAPHY IS APPENDED WHICH INCLUDES THE MOST IMPORTANT CHEMICAL REFERENCES AS WELL AS THE RESEARCHS IN THE REALM OF THE TEST ENGINEERS. /AUTHOR/

• Record URL:
  https://onlinepubs.trb.org/Onlinepubs/hrbproceedings/15/15-016.pdf
• Supplemental Notes:
  • Vol 15, pp 237-260, 7 FIG, 6 TAB, 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.
• Authors:
  • Garrity, L V
  • Kriege, H F
  • Bauer, E E
  • Grant, F R
  • Schofield, H H
• Discussers:
  • PAUL, I
• Publication Date: 1936

Media Info

• Media Type: Digital/other
• Monograph Title: Proceedings of the Fifteenth Annual Meeting of the Highway Research Board Held at Washington, D.C. December 4-6, 1935
• Serial:
  • Highway Research Board Proceedings
  • Volume: 15
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Accelerated tests; Crystallography; Magnesium compounds; Sodium sulfate; Soundness test; Sulfates; Test procedures
• Subject Areas: Geotechnology; Highways;

Filing Info

• Accession Number: 00217832
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Jun 11 1971 12:00AM