FACTORS AFFECTING COATING OF AGGREGATES WITH PORTLAND CEMENT

The Kuwaiti experience in applying the technique of cement coating the smoothly textured aggregates in the production of high-quality asphaltic mixtures has been that the success of the resulting cement treatment was not always certain. It was influenced rather by a number of material and processing variables. The effect of four such variables is investigated by preparing a number of cement-coated sand samples at different levels of treatment and under controlled laboratory conditions. Cement coats produced in these samples were then evaluated by analyzing and comparing the results from a close visual examination, a particle-size analysis, a specific-surface analysis, and a chemical analysis for cement content of the various fractions. The study indicated two extreme and identifiable states of coating within which successful treatments were attainable. At the lower levels of water and cement contents, the added cement failed to adhere permanently to the surface of particles, resulting in a poorly coated sand of a higher fines content. At the higher levels of water and cement, the finer fractions of the sand started forming weakly cemented lumps, thus effecting a coarser gradation that lacked the finer sizes. By applying certain limits on the amount of added cement to avoid arriving at these objectionable extremes, a practical relationship was developed expressing the amount of cement required for proper coating in terms of the specific surface of the sand intended for treatment. (Authors)

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/trr/1982/872/872-010.pdf
• Summary URL:
  • http://scholar.google.com/scholar_lookup?title=FACTORS+AFFECTING+COATING+OF+AGGREGATES+WITH+PORTLAND+CEMENT&author=O.+Daoud&author=H.+Guirguis&author=S.+Hamdani&publication_year=1982
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• Supplemental Notes:
  • Publication of this paper 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.
• Authors:
  • Daoud, OEK
  • Guirguis, H R
  • Hamdani, S K
• Publication Date: 1982

Media Info

• Media Type: Digital/other
• Features: Figures; References; Tables;
• Pagination: pp 56-62
• Monograph Title: Centrifuge-soil testing, soil mechanics and soil properties
• Serial:
  • Transportation Research Record
  • Issue Number: 872
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Aggregates; Asphalt mixtures; Chemical analysis; Coatings; Portland cement; Sieve analysis; Surfaces
• Subject Areas: Geotechnology; Highways; I42: Soil Mechanics;

Filing Info

• Accession Number: 00371193
• Record Type: Publication
• ISBN: 0309034019
• Files: TRIS, TRB
• Created Date: Mar 31 1983 12:00AM