|
|
|
Title: PHYSICAL PROPERTIES OF GRANULAR MATERIALS WITH REFERENCE TO THERMAL RESISTIVITY
Accession Number: 00237200
Record Type: Component
Abstract: A STUDY IS MADE OF THE EFFECT ON THE THERMAL RESISTIVITY OF THE PERCENTAGE AND THE NATURE OF BINDER ADDED TO A ROTHFUCHS GRADED GRANULAR SKELETON OF QUARTZITIC SAND AND GRAVEL. ADDITION OF KAOLINITE IN PERCENTAGES UP TO 16 PERCENT SHOWS THAT THE OPTIMUM AMOUNT IS IN THE VICINITY OF 8 PERCENT. THE USE OF CALCIUM CARBONATE, FLY ASH, LIME AND LIME-FLY ASH AS BINDERS IN AN AMOUNT OF 8 PERCENT SHOWS THAT THE NATURE OF THE BINDER HAS LITTLE EFFECT ON THE THERMAL RESISTIVITY OF THE CEMENTED BACKFILL MATERIAL IN THE NEARLY DRY STATE, AS THE VALUE OF THIS RESISTIVITY IS CONTROLLED CHIEFLY BY THE ORIENTED WATER FILMS. HOWEVER, THE NATURE OF THE BINDER BECOMES IMPORTANT AS ITS AMOUNT INCREASES TO 16 PERCENT AND MORE. THE COMPRESSIVE STRENGTH OF A NEARLY DRY CEMENTED BACKFILL MATERIAL CONTAINING 8 PERCENT BINDER IS FOUND BY EXPERIMENT TO INCREASE LINEARLY WITH ITS THERMAL CONDUCTIVITY, PROVIDED THE BINDER DOES NOT REACT CHEMICALLY WITH THE QUARTZ GRAINS. A STUDY WAS MADE OF THE EFFECT ON THERMAL RESISTIVITY OF THE METHOD BY WHICH A GIVEN MOISTURE CONTENT OF A BACKFILL MATERIAL IS ATTAINED, WHETHER FROM THE DRY SIDE OR THE WET SIDE. WHEN THE MATERIAL DRIES OUT, THE THERMAL RESISTIVITY INCREASES LINEARLY AS THE LOGARITHM OF THE MOISTURE CONTENT DECREASES. HOWEVER, WHEN MOISTURE IS ADDED TO THE DRY MATERIAL, THE THERMAL CONDUCTIVITY INCREASES LINEARLY AS THE LOGARITHM OF THE MOISTURE CONTENT INCREASES. A COMPREHENSIVE EQUATION FOR THE THERMAL CONDUCTIVITY OF A GENERALIZED SOIL IS DEVELOPED TO INCLUDE THE EFFECT OF MOISTURE MIGRATION IN BOTH THE FILM AND THE VAPOR PHASE.
Supplemental Notes: Paper sponsored by Committee on Physico-Chemical Phenomena and presented at the 45th Annual Meeting. 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 #: 01410082
Authors: Farouki, Omar TPagination: pp 25-44
Publication Date: 1966
Serial: Media Type: Print
Features: Figures
(8)
; References
(34)
; Tables
(4)
TRT Terms: Old TRIS Terms: Subject Areas: Geotechnology; Highways
Files: TRIS, TRB
Created Date: Nov 18 1994 12:00AM
More Articles from this Serial Issue:
|
