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Title:

COMPARATIVE INVESTIGATIONS OF INTERNATIONAL TEST METHODS FOR SMALL-SIZED COARSE AGGREGATES

Accession Number:

00217919

Record Type:

Component

Availability:

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Order URL: http://worldcat.org/isbn/0309020840

Abstract:

NOT ENOUGH DETAILED KNOWLEDGE EXISTS ABOUT LOADS AND STRESSES IN ROAD PAVEMENTS. CONSEQUENTLY, BASED ON CERTAIN MODELS, THERE ARE MANY DIFFERENT TEST PROCEDURES FOR COARSE AGGREGATES THAT STRAIN THE MATERIALS BY COMPRESSION, IMPACT, AND ABRASION OR BY A COMBINATION OF THESE STRESSES. A COMPARISON OF TEST VALUES THAT ARE OBTAINED WITH THE DIFFERENT TEST METHODS HAS NOT BEEN POSSIBLE, AND EXPERIENCES WITH VARIOUS QUALIFIED AGGREGATES CANNOT BE TRANSMITTED FROM ONE COUNTRY TO ANOTHER. COMPARATIVE TESTS WERE CONDUCTED BY USING DIFFERENT AGGREGATES WITH THE MOST IMPORTANT TEST METHODS: LOS ANGELES, DEVAL, GERMAN IMPACT, BRITISH IMPACT, AND MODIFIED MARSHALL IMPACT IN STANDARDIZED AND MODIFIED FORM. THE CALCULATED LINEAR REGRESSIONS SHOWED THAT, ALTHOUGH THE STRAINS OF THE AGGREGATES ARE VERY DIFFERENT, THE TESTS CHARACTERIZE THE SAME OR AT LEAST SIMILAR PROPERTIES OF AGGREGATES. IN A COMPARISON OF DIFFERENT LABORATORIES, WE OBTAINED A RELATIVE REPRODUCIBILITY OF ABOUT 20 TO 30 PERCENT FOR THE LOS ANGELES AND THE GERMAN IMPACT TESTS. THIS MEANS THAT FURTHER STRICT STANDARDIZATION OF TESTING MACHINERY AND PROCEDURE IS NECESSARY IF VALUES OBTAINED AT DIFFERENT LABORATORIES ARE TO BE COMPARED. THE CALCULATED LINEAR REGRESSIONS THAT WERE FOUND FOR THE DIFFERENT TEST PROCEDURES WILL ALLOW THE COMPARISON OF SPECIFICATIONS FOR SMALL-SIZED COARSE AGGREGATES TESTED WITH DIFFERENT INTERNATIONAL TEST METHODS. INTERNATIONAL EXPERIENCES AND LITERATURE ON THE QUESTION OF REQUIREMENTS FOR USE OF AGGREGATES CAN NOW BE EXPLOITED.

Supplemental Notes:

Sponsored by Committee on Mineral Aggregates. 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.

Monograph Accession #:

01410329

Authors:

KOHLER, GUNTRAM
Nagel, Jerry

Pagination:

pp 41-51

Publication Date:

1972

Serial:

Highway Research Record

Issue Number: 412
Publisher: Highway Research Board

Conference:

51st Annual Meeting of the Highway Research Board

Location: Washington District of Columbia, United States
Date: 1972-1-17 to 1972-1-21

ISBN:

0309020840

Media Type:

Digital/other

Features:

Figures (7) ; References (37) ; Tables (6)

Uncontrolled Terms:

Comparative analysis

Old TRIS Terms:

Subject Areas:

Geotechnology; Highways; Research

Files:

TRIS, TRB

Created Date:

Apr 17 1973 12:00AM

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