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Title: USING ADDITIVES TO IMPROVE COLD WEATHER COMPACTION
Accession Number: 00134000
Record Type: Component
Availability: Find a library where document is available Abstract: A laboratory investigation was conducted to determine possible methods of improving cold weather earthwork techniques and extending the construction season. Compaction tests, using standard and modified AASHO compactive effort, were conducted on a silty sand at temperatures of 68 and 19 F (20 and -7 C). The low- temperature tests of soil with 0, 2, and 3 percent calcium chloride were performed to study the influence of an additive on the moisture-density relationship of the test soil. Tests at 68 F (20 C) were used to establish a frame of reference for the low-temperature tests and to determine the normal compaction characteristics of the silty sand. To eliminate the effects of particle size, a single sized particle was prepared in the laboratory and indicate that (a) additives can be effectively used to offset the detrimental effect of low temperature on compaction; (b) soils compacted at 19 F(-7 C) and treated with 2 or 3 percent calcium chloride have essentially the same compaction characteristics as an untreated soil compacted at a temperature of 68 F (20 C); and (c) an untreated soil compacted at 19 F (-7 C) has significantly lower dry densities than a soil compacted at 68 F (20 C). The low densities that occur when a soil is compacted while frozen are due to the formation of ice within the pore spaces. Modeling the pore fluid as a solution of additive and water and using the concept of phase equilibria shows that the amount of additive required to prevent the formation of ice in a compacted soil is related to the freezing point depression characteristics of the additive. A discussion of field problems and application techniques is included to aid the practicing engineer in using the method suggested in the paper.
Supplemental Notes: Publication of this paper sponsored by Committee on Compaction. 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.
Monograph Title: Monograph Accession #: 01411418
Authors: Haas, Wilbur MAlkire, Bernard DKaderabek, Thomas JPagination: pp 57-68
Publication Date: 1976
Serial: Conference:
54th Annual Meeting of the Transportation Research Board
Location:
Washington District of Columbia ISBN: 0309024706
Media Type: Print
Features: Figures
(8)
; References
(17)
TRT Terms: Old TRIS Terms: Subject Areas: Construction; Geotechnology; Highways; Materials
Files: TRIS, TRB
Created Date: Jul 22 1976 12:00AM
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