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Title: LABORATORY MEASUREMENT OF THE EFFECT OF MOISTURE ON WORKABILITY AND PERFORMANCE OF ASPHALT TREATED MIXES (DISCUSSION)
Accession Number: 00377901
Record Type: Component
Availability: Find a library where document is available Abstract: While this study dealt with only asphalt as the liquid component being absorbed, Schmidt pointed out moisture would lower the asphalt absorption and in effect increase the volume of asphalt in the voids. He concluded that if such secondary volumes are too high, adequate rolling would suffer, though less so with pneumatic or vibratory equipment. These examples, applied to moisture, led to the observation that each situation needs to be examined as to whether the amount of moisture left in a mix is interfering or aiding in the laying of a hot mix. Extra moisture in a mix could help compaction because of its greater lubricating ability. Too much moisture could contribute to the overfilling of the voids, making the mix unstable under rolling conditions. It was felt this could occur for a variety of reasons, such as moisture left on the aggregate or absorbed moisture. To examine the effect of moisture on hot-mix asphalt pavement performance, Schmidt drew on several published studies of the resilient modulus of laboratory specimens exposed to various moisture conditions. This included introducing or expelling moisture to several levels under a variety of conditions by vacuum saturation, vacuum dessication, drying at 50 percent and 95 percent relative humidities, freeze-thaw, etc. Schmidt concluded that the major detrimental effects of residual moisture in a mix that are now evident are, on initial compaction, a reduced modulus, and possibly a problem with freeze-thaw damage. (Author)
Supplemental Notes: This paper appeared in Transportation Research Circular No. 262, Second Look at Moisture Restrictions in Hot-Mix Plant Operations and Construction. 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.
Corporate Authors: Transportation Research Board 500 Fifth Street, NW Authors: Schmidt, R JPagination: p. 5-10
Publication Date: 1983-8
Serial: Media Type: Digital/other
Features: Figures
(9)
; References
(5)
TRT Terms: Old TRIS Terms: Subject Areas: Construction; Highways; Maintenance and Preservation; Materials; Vehicles and Equipment; I52: Construction of Pavements and Surfacings
Files: TRIS, TRB
Created Date: Dec 30 1983 12:00AM
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