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Title:

FACTORS INFLUENCING COMPACTION OF SOILS

Accession Number:

00232504

Record Type:

Component

Abstract:

MOISTURE CONTENT IS RECOGNIZED AS BEING OF FUNDAMENTAL IMPORTANCE IN SOIL COMPACTION, HOWEVER, THE INFLUENCE OF CHARACTERISTICS OF THE COMPACTING EQUIPMENT AND CERTAIN PROPERTIES OF THE SOIL BEING COMPACTED ARE EQUALLY IMPORTANT. FACTORS AFFECTING COMPACTION WITH SHEEPSFOOT AND RUBBER-TIRED ROLLERS ARE DISCUSSED. VARIABLES ENTERING INTO THE PROCESS OF COMPACTION BY A SHEEPSFOOT ROLLER ARE: THE ROLLER WEIGHT, AREAS AND SHAPE OF FEET, FOOT SPACING, AND DRUM DIAMETER. TO THESE MUST BE ADDED THE VARIABLES INTRODUCED BY THE SOIL WHICH INCLUDE: TYPE OF SOIL, WATER CONTENT, INITIAL DENSITY, ETC. IT IS CONCLUDED THAT IT IS DESIRABLE TO USE THE HEAVIEST ROLLER AVAILABLE, BUT THE ROLLER MUST NOT IMPOSE HEAVIER UNIT LOADS THAN THE SOIL CAN CARRY. IT IS BELIEVED THAT FIRST PRIORITY SHOULD BE GIVEN TO VARYING THE AREA OF THE FEET RATHER THAN THE TOTAL WEIGHT OF THE ROLLER. VARIABLES PRESENT IN COMPACTION OF SOILS IN LIFTS WITH RUBBER-TIRED ROLLERS INCLUDE: AREA OF CONTACT, CONTACT PRESSURE, NUMBER OF COVERAGES, AND THICKNESS OF LIFT. IT IS CONCLUDED THAT THE VARIATION OF THE BEARING CAPACITY OF DIFFERENT SOILS MUST BE RECOGNIZED, AND THAT IT IS DESIRABLE TO VARY THE RUBBER-TIRE ROLLER TO SUIT THE SOIL AND ITS BEARING CAPACITY WHEN BEING COMPACTED. TIRE SIZE GREATLY AFFECTS THE BEARING CAPACITY IN SOILS DERIVING AN IMPORTANT PART OF THEIR STRENGTH BY FRICTION, SINCE THE LARGER THE LOADED AREA THE LARGER THE BEARING CAPACITY. THE MOST IMPORTANT FACTOR IS CONTACT PRESSURE AND THIS SHOULD BE AS LARGE AS CONDITIONS PERMIT. SUBGRADE COMPACTION BY RUBBER-TIRED AND SHEEPSFOOT ROLLERS IS MENTIONED BRIEFLY AND SOME OF THE FACTORS INVOLVED ARE DISCUSSED.

Supplemental Notes:

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:

Compaction of Soil

Monograph Accession #:

01497802

Language:

English

Authors:

Turnbull, W J
JOHNSON, S J
Maxwell, A A

Pagination:

pp 1-11

Publication Date:

1949-11

Serial:

Highway Research Board Bulletin

Issue Number: 23
Publisher: Highway Research Board

Conference:

28th Annual Conference of the Highway Research Board

Location: Washington District of Columbia, United States
Date: 1948 to 1948

Media Type:

Print

Features:

Figures (5)

Old TRIS Terms:

Subject Areas:

Geotechnology; Highways; Materials; Vehicles and Equipment

Files:

TRIS, TRB, ATRI

Created Date:

Aug 15 2004 2:43AM

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