Impact of fine materials content on the transport of dust suppressants in gravel road wearing courses
2011 (English)In: Journal of materials in civil engineering, ISSN 0899-1561, Vol. 23, no 8, 1163-1170 p.Article in journal (Refereed) Published
A significant problem when dust-suppressing agents are used on gravel roads is that they tend to leach during rainfall. The purpose of this study is to illustrate this problem by using laboratory studies and studies in situ. Both capillary rise and leaching of suppressants were examined by using cylinders filled with wearing course material. Chloride was more prone than lignosulphonate to transport upwards by means of capillary rise, and therefore, it showed a more effective performance over a longer period of time. Optimal percentages of fine material for minimal lignosulphonate and chloride leaching were found to be 15% by weight and 10-15% by weight, respectively. Ions of calcium chloride seemed to flocculate clay particles, which probably prevents them from leaching. To study the in situ longevity of fine material in general, calcium carbonate, mesa, was used as a marker. The fine material in gravel wearing courses must be replenished regularly. Mesa loss was up to 80% after 1 year.
Place, publisher, year, edition, pages
2011. Vol. 23, no 8, 1163-1170 p.
Gravel roads, Dust suppressants, Vertical transportation, Leaching, Fine material content
IdentifiersURN: urn:nbn:se:kth:diva-12358DOI: 10.1061/(ASCE)MT.1943-5533.0000282ISI: 000293533100005ScopusID: 2-s2.0-79961073162OAI: oai:DiVA.org:kth-12358DiVA: diva2:309925
QC 20100616. Updated from submitted to published 20120326. Previous title: Transport of Dust Suppressants in Gravel Road Wearing Courses Related to Fine Material Content2010-04-092010-04-092012-03-26Bibliographically approved