00232873

Component

https://onlinepubs.trb.or...hrbproceedings/6/6-041.pdf

DR. MARBUT FEELS THAT THE ANALYSIS OF DR. TERZAGHI WAS AN ABSTRACT ONE AND DOES NOT SHOW WHAT THE SPECIFIC REACTION OF A GIVEN MATERIAL WOULD BE UNDER ANY CIRCUMSTANCE. ATTENTION SHOULD BE CALLED TO THE DIFFERENCES IN HIGHWAY SUBGRADES MATERIALS. THERE ARE THREE LAYERS OF HORIZONS OF SOIL, VARYING GREATLY IN THICKNESS, SUPER- IMPOSED ONE ABOVE THE OTHER IN THE UPPER PART OF THE EARTH'S CRUST. LABORATORY STUDIES ARE ONE METHOD OF INVESTIGATION, WHILE ANOTHER IS THE FIELD EXPERIMENT WHICH CONSISTS OF THE LAYING DOWN OF EXPERIMENTAL ROADS. A THIRD METHOD OF INVESTIGATION IS THE FIELD OBSERVATIONAL METHOD WHICH CONSISTS IN THE STUDY OF THE RELATIONSHIP OF ROADS THAT ARE ACTUALLY IN USE TO THE CHARACTER AND CONDITION OF MATERIALS CONSTITUTING THEIR SUBGRADES. MR. HERSCHEL FEELS THAT INSUFFICIENT EMPHASIS IS PLACED ON THE FACT THAT FAILURE OF ROAD SURFACES MAY BE DUE TO THE SQUEEZING OUT OF THE SUBSOIL, WHICH BECOMES MORE NEARLY A PROBLEM IN HYDRODYNAMICS. MR. ENO POINTS OUT THAT HE HAS SHOWN THAT THE WATER CONTENT OF THE OHIO SOILS BENEATH THE ROADS RUNS A MAXIMUM OF ABOUT 43% IMMEDIATELY BENEATH THE PAVEMENT AND AN AVERAGE OF 22 TO 23 PERCENT FOR THE GREATER DEPTH, OR ABOUT 5% HIGHER THAN THE SUBSOIL ON THE ROAD SHOULDER. THIS APPEARS TO BE DUE TO THE ELIMINATION OF A PART OF THE EVAPORATION BENEATH THE ROAD SLAB. THE CLOSURE BY DR. TERZAGHI COMMENTS ON THE DISTINCTION DR. MARBUT MAKES BETWEEN THREE ESSENTIALLY DIFFERENT METHODS FOR SOLVING THE SUBGRADE PROBLEM OF THE HIGHWAY ENGINEER. BASED ON EXPERIENCE, IT IS CONCLUDED THAT PROBLEMS CANNOT POSSIBLY BE SOLVED IN A SATISFACTORY MANNER EXCEPT BY COMBINED APPLICATION OF ALL THREE METHODS. ANOTHER GROUP OF UNKNOWN QUANTITIES CONCERNS THE PHYSICAL CAUSES OF OBVIOUS ROAD DEFECTS. TO LEARN THE CAUSE OF SUCH DEFECTS REQUIRES A WELL DEFINED KNOWLEDGE OF THE MECHANICAL EFFECTS OF THE PHYSICAL CAUSES INVOLVED, AND THE KNOWLEDGE OF THE RELATION BETWEEN PHYSICAL CAUSES AN MECHANICAL EFFECTS CAN MOST ECONOMICALLY BE OBTAINED BY SYSTEMATIC EXPERIMENTATION UNDER ARTIFICIALLY SIMPLIFIED CONDITIONS IN THE LABORATORY.

Vol 6, pp 409-420. 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.

01488025

1927

Highway Research Board Proceedings

Digital/other

Chemical analysis; Experimental roads; Field studies; Laboratory studies; Moisture content; Soil chemistry; Soil horizon; Soil tests; Subgrade (Pavements); Subsoil; Surface course (Pavements); Yield point

Site investigation

Geotechnology; Highways

TRIS, TRB

Jun 11 1971 12:00AM

• A COMPARISON OF ROAD CONDITIONS WITH ATTERBERG'S LIMITS AND THE OTHER STANDARD SOIL TESTS
• A STUDY OF THE MOISTURE CONTENT OF OHIO SOILS
• ADDRESS ON THE HIGHWAY AND THE LABORATORY
• ANALYSIS OF STRESSES IN CONCRETE PAVEMENTS DUE TO VARIATIONS OF TEMPERATURE
• BITUMINOUS MATERIALS FOR SURFACE TREATMENT
• BRIEF REVIEW OF ALKALI ACTION ON PORTLAND CEMENT CONCRETE
• COLLECTION AND DISPOSITION OF MOTOR VEHICLE REVENUES
• CONCRETE AND CONCRETE AGGREGATES
• DISCUSSION OF PROGRESS REPORT ON CULVERT INVESTIGATION
• DISCUSSION OF PROGRESS REPORT ON LOWCOST IMPROVED ROADS INVESTIGATION
• DISCUSSION OF REPORT OF COMMITTEE ON CHARACTER AND USE OF ROAD MATERIALS. I. CONCRETE MATERIALS
• DISCUSSION OF REPORT OF COMMITTEE ON CHARACTER AND USE OF ROAD MATERIALS. II. BITUMINOUS MATERIALS
• DISCUSSION OF REPORT OF COMMITTEE ON ECONOMIC THEORY OF HIGHWAY IMPROVEMENT
• DISCUSSION OF REPORT OF COMMITTEE ON HIGHWAY FINANCE
• DISCUSSION OF REPORT OF COMMITTEE ON HIGHWAY TRAFFIC ANALYSIS
• DISCUSSION OF REPORT OF COMMITTEE ON MAINTENANCE
• DISCUSSION OF REPORT OF COMMITTEE ON STRUCTURAL DESIGN OF ROADS
• EXTRACT FROM REPORT ON VIRGINIA FEDERAL AID PROJECT 371-C
• FIELD CONTROL OF CONCRETE MAKING-A STUDY OF LATE PRACTICE
• FILL SETTLEMENT IN PEAT MARSHES
• IMPACT FORCES EXERTED BY THE MOTOR TRUCK ON THE HIGHWAY
• INVESTIGATIONS OF AIR RESISTANCE ON AUTOMOBILES
• INVESTIGATIONS OF ASPHALTIC PAVING MIXTURES RELATIVE TO DEFORMATION OF SURFACES UNDER TRAFFIC
• PAPER ON THE METHODS AND POSSIBILITIES OF ROAD-SOIL INVEST- IGATIONS
• PAVEMENT DISPLACEMENT DUE TO WATER AND FROST
• PROGRESS REPORT ON A FIELD EXPERIMENT ON INTRODUCTION OF PLANES OF WEAKNESS IN CONCRETE SLABS
• PROGRESS REPORT ON CULVERT INVESTIGATION
• PROGRESS REPORT ON LOW-COST IMPROVED ROADS INVESTIGATION
• PROGRESS REPORT ON THE EXPERIMENTAL CURING SLABS AT ARLINGTON, VIRGINIA
• PROGRESS REPORT ON TIRE WEAR INVESTIGATION
• REPORT OF COMMITTEE ON HIGHWAY TRAFFIC ANALYSIS
• REPORT OF COMMITTEE ON MAINTENANCE. I. MAINTENANCE OF CONCRETE PAVEMENTS
• REPORT OF COMMITTEE ON MAINTENANCE. II-SNOW REMOVAL AND SNOW REMOVAL EQUIPMENT
• REPORT OF COMMITTEE ON MAINTENANCE. III-COVERING FOR POORLY CONSTRUCTED AND DISINTEGRATING CONCRETE ROADS
• REPORT OF COMMITTEE ON MAINTENANCE. IV-ANNUAL REDUCTION THICKNESS OF GRAVEL ROADS UNDER DIFFERENT TRAFFIC AND EFFECT OF DUST PALLIATIVES
• REPORT OF COMMITTEE ON MAINTENANCE: V. MAINTENANCE COSTS AS AFFECTED BY THE TYPE OF PAVEMENT AND AMOUNT OF TRAFFIC
• REPORT OF DIRECTOR
• REPORT ON FORMATION OF SPECIAL COMMITTEE ON CAUSES AND PREVENTION OF HIGHWAY ACCIDENTS
• SOME PRINCIPLES INVOLVED IN BITUMINOUS MACADAM CONSTRUCTION
• SUB-BASE TESTS ON ROUTE 26, WASHINGTON COUNTY, OHIO
• SUBGRADE MATERIALS AND TESTS
• SUBGRADE STUDIES OF THE U.S. BUREAU OF PUBLIC ROADS
• THE NORTH CAROLINA ROAD TEST TRUCK
• THE SLAKING TEST
• THINNER PAVING BRICK
• TIRE WEAR INVESTIGATION