00680785

Component

http://onlinepubs.trb.org.../1995/cp6/v2/cp6v2-026.pdf

The effects of calcium chloride (CaCl2) on the properties of Finnish road construction materials used in the base course and subbase were examined. The properties studied in laboratory conditions were, first, the basic properties of grain size, specific surface area, water adsorption, and zeta-potential; and second, the compactability, frost heave and migration of these materials. Studies were also performed on full-depth reclamation with CaCl2 used in the United States and Canada. The literature review yielded a positive indication for the use of CaCl2 in road construction. The materials studied were crushed aggregates and glacial tills. The test results indicate that CaCl2 enriches in finer parts of materials, binds the finer particles together, and increases their water adsorption. Changes in the basic properties affect compactability and frost heave. The compaction needed to achieve a maximum dry unit weight decreases with CaCl2 use, and the material stays wet for long periods. When CaCl2 was used as an additive, the compactability of materials at below-zero temperatures was clearly better and the dry unit weight was nearly the same as at room temperature. Frost heaves decreased remarkably, even by 80% in frost-susceptible materials. The migration studies showed that the stability of CaCl2 is poor when it is in contact with percolating water. Despite the positive technical facts, the environmental effects should be considered carefully. The environmental effects were not studied, but some estimations were made, mainly based on a literature review.

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00680715

English

p. 225-233

1995

Transportation Research Board Conference Proceedings

Sixth International Conference on Low-Volume Roads

0309060745

Digital/other

Figures (10) ; References (12) ; Tables (1)

Base course (Pavements); Calcium chloride; Compactibility; Conferences; Environmental impacts; Frost heaving; Grain size (Geology); Guides to the literature; Land reclamation; Literature reviews; Low temperature; Low volume roads; Materials; Seepage; Soil stabilization; Subbase (Pavements); Surfaces

Subbase; Surface area

Environment; Geotechnology; Highways; Hydraulics and Hydrology; Materials; I35: Miscellaneous Materials; I42: Soil Mechanics

TRIS, TRB, ATRI

Jun 7 1995 12:00AM