Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 119 for “"subgrade"”.
-
Evaluation of Laboratory Durability Tests for Stabilized Subgrade Soils
… tests available for assessing stabilized subgrade materials. Improved understanding of these tests is needed to enable more objective selection of durability tests by design engineers and to facilitate more meaningful comparisons of data obtained for different stabilizer treatments using …
-
Pedologic Based Subgrade Characterization for Low-Volume Pavement Design
Subgrade soils play an integral part in pavement performance. The nature and properties of subgrade soils must be considered in structural pavement design. Many highway agencies, particularly agencies that administer "local" or low-volume pavements, do not have the resources to conduct …
-
Stabilisation of clay subgrade soils using ground granulated blastfurnace slag
Roads constructed on expansive clays may be adversely affected by the behaviour of the clay. Expansive clays suffer volume change due to changes in moisture content which causes heaving, cracking and the break up of the road pavement. Stabilisation of these types of soil is necessary to suppress …
-
Evaluation of subgrade strength and flexible pavement designs for reliability
… with the design inputs. In this study, subgrade strength variability and flexible pavement designs are evaluated for reliability. The effects of weak subgrade on pavement design and performance prediction are evaluated through a case study using Mechanistic-Empirical Pavement Design …
-
The Behavior of Pore Water Pressure in Cohesive Subgrade Soils
… on the behavior of pore water pressure in subgrade cohesive soils under Falling Weight Deflectometer (FWD) tests. The deflection of a pavement structure largely depends on the deformation of subgrade soils, which is in turn dependent upon soil stiffness. Soil stiffness can be characterized …
-
Influence of subgrade improvement and non-uniformity on pavement performance
… and finite element modeling results of various subgrade materials including self-cementing fly ash stabilized subgrade, natural subgrade, granular subbase, and hydrated fly ash. The first project shows that self-cementing fly ash stabilization of RAP-soil mixtures is economically feasible and …
-
Subgrade Soil Evaluation for the Design of Airport Flexible Pavements
… Pavement Test Facilities (NAPTF) cohesive subgrade soils. NAPTF full-scale pavement data will be used to validate the concepts and procedures.
-
The Vibration of Foundations With Various Types of Subgrade Support
Made available in DSpace on 2014-12-08T23:56:34Z (GMT). No. of bitstreams: 1 6607743.pdf: 3850378 bytes, checksum: 4382f8fc7c0b744d48ff93ca4ebe298e (MD5) Previous issue date: 1966
-
Field investigation of subgrade non-uniformity effects on concrete pavement
… is through the assignment of a single modulus of subgrade reaction (k-value) to the soil for the section under consideration. It is well known that soil under pavement is not a homogenous, elastic, and isotropic half-space but varies spatially due to variations in the soil geological properties, …
-
Dynamic analysis of dynamic cone penetration test for subgrade compaction assessment
<p>In practice, soil compaction quality assessment relies on the determination of the in-place compacted dry unit weight, which is then compared with the maximum dry unit weight obtained from a laboratory compaction test. Most DOTs typically require that the in-place dry unit weight for compacted …
-
Dynamic analysis of dynamic cone penetration test for subgrade compaction assessment
In practice, soil compaction quality assessment relies on the determination of the in-place compacted dry unit weight, which is then compared with the maximum dry unit weight obtained from a laboratory compaction test. Most DOTs typically require that the in-place dry unit weight for compacted soil …
-
Reinforcement of pavement subgrade using granular fill and a geosynthetic layer
… pavement structures over soft and compressible subgrade. Such conditions render the structures unable to withstand required design loads and thus are susceptible to high settlements associated with excessive distress leading to pavement damage. The use of imported quality fill to improve the …
-
Evaluation of the laboratory resilient modulus test using a New Mexico subgrade soil
… determination of resilient modulus for an A-6 subgrade soil at varying moisture conditions (± 2-3% relative to optimum). Specimens of 2.8 inch and 4 inch diameters are reconstituted using modified proctor compaction. Resilient modulus values are determined using internal and external …
-
Evaluation of Moisture, Suction Effects and Durability Performance of Lime Stabilized Clayey Subgrade Soils
… strength (UCS) of lime treated clayey subgrade soils. Two subgrade soils: the AASHTO class A-6 and A-7-6 are collected from US 491 road site in New Mexico. Cylindrical soil specimens are prepared according to NCHRP 1-28A at three lime percentages: 0%, 5% and 7% which are selected based …
-
An investigation of the effect of dynamic and static loading to geosynthetic reinforced pavements overlying a soft subgrade
… within a granular base overlying a soft subgrade of California Bearing Ratio (CBR) less than 2% in a 1.0 m3 steel test box. Firstly, a geotextile/geogrid was placed at the interface between the base layer and subgrade. Thereafter, a combination of the geotextile at the interface (of the …
-
A theoretical analysis of the stress distribution, due to wheel loads in the subgrade under pavements of flexible type
Thesis: B.S., Massachusetts Institute of Technology, Department of Civil Engineering, 1935
-
Low cost monitoring system to diagnose problematic rail bed : case study of Mud Pumping Site
… aimed at characterizing problematic rail beds (subgrade). The instrumentations are installed at a busy high-speed Northeast Corridor (NEC) railway site that is experiencing recurring mud pumping problems and requires frequent (bi-monthly) track maintenance. The field instrumentation program …
-
Width-dependent characteristics of pile/soil system subjected to lateral force.
… deals with the determination of modulus of subgrade reaction for both sandy and clayey soils surrounding laterally loaded short piles. The initial value of modulus of subgrade reaction determined is based on Terzaghi, Bowles' and Vesic's method. The difference in lateral displacement of …
-
Moisture effects on the mechanical behavior of flexible pavement subgrades
… focuses on the effect that moisture in the subgrade has on the mechanical response and performance of flexible pavement structures. The research work is based on experiments on a series of full-scale pavement test sections that were built inside a testing facility where the temperature and …
Page 1 of 6