MINERALOGICAL ASSESSMENT OF THE DURABILITY OF AGGREGATES USED IN FLEXIBLE ROAD PAVEMENTS. DURABILITY AND PERFORMANCE OF BITUMINOUS HIGHWAY MATERIALS, HATFIELD POLYTECHNIC, 3-4 APRIL 1989
A mineralogical assessment of the durability of a range of igneous and sedimentary rocks currently in use as pavement aggregate in derbyshire is provided in this paper. All rocks tested are classified as 'hard' and contain the following: basalt, granite, diorite a, b, or c, porphyroid (porphyry) or gritstone. Random samples of the aggregate were undertaken and the material subjected to a number of mineralogical and chemical tests. Scanning electron microscopy, x-ray diffraction, and thin section petrography provided mineralogical information, while chemical data was obtained using x-ray fluorescence, atomic absorption spectrophotometry and standard wet chemical laboratory techniques. Evidence is put forward to show that such tests can be used accurately to assess the durability of aggregates. Particular reference is made to the identification in the samples of decomposition products caused by weathering such as vermicalites or smectites. Petrological/mineralogical analyses when backed by scanning electron microscopy and other techniques used to assess physical properties such as 10% fines or impact, abrasion or crushing values is said to be the most effective method currently available to assess aggregate durability. For the covering abstract of the conference see IRRD 823743.
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Corporate Authors:
Hatfield Polytechnic, England
School of Engineering, College Lane, P.O. Box 109
Hatfield, Hertfordshire, England -
Authors:
- INESON, P R
- BUIST, D S
- Publication Date: 1989
Language
- English
Media Info
- Pagination: 8 p.
Subject/Index Terms
- TRT Terms: Basalt; Chemical analysis; Coarse aggregates; Conferences; Durability; Evaluation and assessment; Granite; Mineralogy; Petrography; Rocks; Weathering
- Uncontrolled Terms: Diorite
- Subject Areas: Data and Information Technology; Geotechnology; Planning and Forecasting;
Filing Info
- Accession Number: 00498694
- Record Type: Publication
- Source Agency: Transport and Road Research Laboratory (TRRL)
- Files: ITRD, TRIS
- Created Date: Sep 30 1990 12:00AM