Microscopic and X-Ray Examination of Rock for Durability Testing

Van Atta, Robert O.; Ludowise, Harry

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Microscopic and X-Ray Examination of Rock for Durability Testing

1976-12-01
By Van Atta, Robert O. ; Ludowise, Harry

File Language:

English

[PDF - 27.65 MB]

Details

Creators:

Van Atta, Robert O. ; Ludowise, Harry
Corporate Creators:

Portland State University ; United States. Federal Highway Administration
Corporate Contributors:

United States. Department of Transportation. Federal Highway Administration. Office of Research and Development
Subject/TRT Terms:
Publication/ Report Number:

FHWA-RD-77- 36;FCP 34F7-012
Resource Type:

Tech Report
Geographical Coverage:

United States
Edition:

Final Report
Contracting Officer:

Forster, S. W.
Corporate Publisher:

United States. Federal Highway Administration
Abstract:

Study of quarry rocks, core, weathered rock, and road base aggregates from 12 sources in western Oregon reveals that degree and type of alteration and textural distribution of glass are the chief causes of degradation in basaltic aggregate used in road construction. Smectitic clays are the alteration products most responsible for breakdown. Sampling for testing should include weathered rock. Some standard tests for durability show a higher correlation than others with type and degree of alteration and with actual service records of basaltic rock. A standard petrographic microscopic test must precede . other testing. A stain test using benzidine to reveal the presence and textural distribution of montmorillonite and nontronite clays shows promise as a supplement to standard AASHTO tests. In very doubtful cases, tests using activation by thermal neutron irradiation may be used to detect sodium distribution in rocks. Scanning electron microscopy is of value to detect micro-fracturing.
Format:

PDF
Download URL:

https://rosap.ntl.bts.gov/view/dot/39832/dot_39832_DS1.pdf
File Type:

[PDF - 27.65 MB]
Collection(s):

Federal Highway Administration ; US Transportation Collection
Main Document Checksum:

urn:sha-512:4a441487aa8f72302fe6c81ee9a1fb330bbd20570fbfd62e92907a61c6c6d306be25dfa5bb18e15c5cc227f63ea7bdc5e510a3370c1ca6f80f00ad296eac57c0

File Language:

English

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