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- Title
Detection of Aggregate Clay Coatings and Impacts on Concrete.
- Authors
Muñoz, Jose F.; Tejedor, M. Isabel; Anderson, Marc A.; Cramer, Steven M.
- Abstract
Deleterious clay minerals often enter concrete as coatings on aggregates; the impacts of the certain clays introduced by this mechanism is the subject of this study. The effects of different clay properties, including cation exchange capacity (CEC) and the nature of the exchangeable cations on concrete, were measured. The material selected for this research was an igneous clean coarse aggregate which, for purposes of repeatability and experimental control, was lab-coated with four different clay suspensions (kaolin, illite, sodium montmorillonite, and calcium montmorillonite). The coated aggregate was then used to make concrete test specimens. The results clearly show that the impact of the clays is not only a function of the CEC of the clay but also of the nature of the exchangeable cation.
- Subjects
MINERAL aggregates; SURFACE coatings; CONCRETE; CLAY minerals; CATIONS; KAOLIN; ILLITE
- Publication
ACI Materials Journal, 2010, Vol 107, Issue 4, p387
- ISSN
0889-325X
- Publication type
Article
- DOI
10.14359/51663865