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Author: Robert L. Mokwa Publisher: ISBN: Category : Pavements Languages : en Pages : 60
Book Description
A key material property used in the mechanistic-empirical pavement design guide (MEPDG) is the resilient modulus (M sub r), which either can be obtained from experimental testing or can be backcalculated from other measured soil properties. The determination of a representative M sub r value for a given subgrade, considering seasonal variations and testing intricacies, is not an easy or straightforward task. Over 30 different correlation equations were reviewed in this study. Selected equations were further examined using data from two Montana Department of Transportation (MDT) soil survey reports. Results from the literature review and preliminary data evaluation indicate there is little to no consistency between equations for predicting M sub r from soil index and classification properties.
Author: Robert L. Mokwa Publisher: ISBN: Category : Pavements Languages : en Pages : 60
Book Description
A key material property used in the mechanistic-empirical pavement design guide (MEPDG) is the resilient modulus (M sub r), which either can be obtained from experimental testing or can be backcalculated from other measured soil properties. The determination of a representative M sub r value for a given subgrade, considering seasonal variations and testing intricacies, is not an easy or straightforward task. Over 30 different correlation equations were reviewed in this study. Selected equations were further examined using data from two Montana Department of Transportation (MDT) soil survey reports. Results from the literature review and preliminary data evaluation indicate there is little to no consistency between equations for predicting M sub r from soil index and classification properties.
Author: David E. Newcomb Publisher: Transportation Research Board ISBN: 9780309068574 Category : Science Languages : en Pages : 84
Book Description
This synthesis report will be of interest to pavement and geotechnical design and research engineers, geologists and engineering geologists, and related laboratory personnel. It describes the current practice for measuring in situ mechanical properties of pavement subgrade soils. The tests conducted to measure the mechanical properties of soil strength and stiffness are the primary topics, and these are discussed in the context of design procedures, factors affecting mechanical properties, and the variability of measurements. Information for the synthesis was collected by surveying U.S., Canadian, and selected European transportation agencies and by conducting a literature search. This TRB report provides information on existing and emerging technologies for static and dynamic, and destructive and nondestructive testing for measuring in situ mechanical properties of pavement subgrade soils. Correlations between in situ and laboratory tests are presented. The effects of existing layers on the measurement of subgrade properties, and soil spatial and seasonal variability are discussed. Most importantly, the use of soil properties in pavement design and evaluation are explained. New applications or improvements to existing test methods to support the use of mechanistic/stochastic-based pavement design procedures are also explained.
Author: Zahid Hossain Publisher: ISBN: Category : Correlation Languages : en Pages : 12
Book Description
Resilient modulus (Mr) of subgrade soil is a key input parameter in all three hierarchical levels of the new mechanistic-empirical pavement design guide (MEPDG). A successful implementation of the MEPDG requires a comprehensive evaluation of Mr database(s) for local subgrade soils and its assessment to determine desired input parameters. To this end, a database containing subgrade Mr values, index properties, standard Proctor, and unconfined compressive strengths for 712 soil samples from 39 different counties in Oklahoma was developed. A total of five stress-based regression models were evaluated using a statistical software package ("SPSS," Version 17), and material constants (k1, k2, and k3) for these soils, categorized in accordance with the American Association of State Highway and Transportation Officials Classification system, were determined. The goodness of fit and the significance of these models were ranked with respect to their R2 and F values, respectively; the MEPDG recommended octahedral model was found to outperform the others. Furthermore, reasonably good correlations of material constants with routine soil properties were established for Level 2 analysis and design. Typical Mr values of common Oklahoma soils for Level 3 analysis and design were also estimated. The findings of this study are expected to help the implementation of the MEPDG in Oklahoma.
Author: E. S. Reddy Publisher: New Age International ISBN: 9788122414134 Category : Engineering geology Languages : en Pages : 244
Book Description
This Book Highlights The Procedures For 30 Tests Used To Measure The Engineering Properties Of Soil In Both Laboratory And Field Including Dynamic Testing Of Soils. All The Test Procedures Are Based On Indian Standard Practice And Are Very Close To Astm Standards. Features Of This Book Include: * Test Procedures And Tabular Forms For A Maximum Number Of Field And Laboratory Tests. * Classification Of The Soil Tests Based On Type Of Project And Type Of Soil. * A Set Of Questions Is Presented At The End Of Each Chapter For Self Examination. * For Each Test, Theoretical Principles And The Precautions To Be Followed During The Test Are Explained.This Book Will Be Useful To B.Tech./B.E. (Civil Engineering) And M.E./ M.Tech. (Geotechnical Engineering) Students As Laboratory Manual And Reference Book. It Is Hoped That This Book Will Also Be Useful To Field Engineers As Handbook In Soil Mechanics As It Helps In Deciding The Test Programme For A Given Project. Similarly, The Book Will Be Helpful For Quality Control Engineers.
Author: Cheng Liu Publisher: Prentice Hall ISBN: 9780138223793 Category : Soil mechanics Languages : en Pages : 315
Book Description
This unique manual guides users step-by-step through the hows and whys of the most commonly used testing methods in civil engineering practicethose based on the latest American Society for Testing and Materials (ASTM). The book uses a consistent Procedure, Data, and Calculations format for each test; contains completely worked examples showing the computations required for the analysis and evaluation of the test data collected; discusses what data, results, and other information should be presented in the test report; and explains what the test results will be used for in practical engineering problems. Blank data reporting forms and graph papers are provided for most tests, and an accompanying CD-ROM contains state-of-the-art, user-friendly software for compiling test data, performing calculations, plotting curves, and obtaining final results. For individuals interested in a construction or civil engineering technology career.
Author: Keppel Coughlan Publisher: CSIRO PUBLISHING ISBN: 064309959X Category : Science Languages : en Pages : 392
Book Description
Soil physical measurements are essential for solving many natural resource management problems. This operational laboratory and field handbook provides, for the first time, a standard set of methods that are cost-effective and well suited to land resource survey. It provides: *practical guidelines on the soil physical measurements across a range of soils, climates and land uses; *straightforward descriptions for each method (including common pitfalls) that can be applied by people with a rudimentary knowledge of soil physics, and *guidelines on the interpretation of results and integration with land resource assessment. Soil Physical Measurement And Interpretation for Land Evaluation begins with an introduction to land evaluation and then outlines procedures for field sampling. Twenty detailed chapters cover pore space relations, water retention, hydraulic conductivity, water table depth, dispersion, aggregation, particle size, shrinkage, Atterburg limits and strength. The book includes procedures for estimating soil physical properties from more readily available data and shows how soil physical data can be integrated into land planning and management decisions.
Author: D. G. True Publisher: ISBN: Category : Errors Languages : en Pages : 82
Book Description
A study was conducted of the potential applicability of nuclear measuring techniques for determining soil density and moisture content at depth, and changes in these properties, for Navy civil engineering purposes. Measurements were obtained under two different types of engineering requirement to assess measurement capabilities: (1) in base material and subgrade soil beneath the pavements at five airfields, to detect long term variations; (2) in hydraulically placed foundation soils at two construction sites, both before and after densification of the soil was attempted by driving compaction piles, to detect changes due to the densification effort. The data were analyzed and statistical procedures were developed to determine the magnitudes of measurement error. Measurement errors were relatively low compared with the measured temporal variations in the soil properties at th soil densification sites, but were so large as to obscure a large portion of low-level, long-term changes occurring in the pavement subgrades. (Author).
Author: Ernest Theodore Selig Publisher: Thomas Telford ISBN: 9780727720139 Category : Business & Economics Languages : en Pages : 468
Book Description
This comprehensive study provides practical advice and guidance on the important topics of rail transport and ground engineering, the use of which will result in optimum quality with the minimum maintenance effort and the most economical use of resources. The authors have synthesized all of their international knowledge and experience in this field, and produced, for the first time, a definitive guide for the design, construction, maintenance and renewal of railway track as they relate to geotechnology.
Author: K. Meshram Publisher: ISBN: Category : Density Languages : en Pages : 5
Book Description
One of the key parameters for the performance of a pavement is uniformity of its sub-grade. In situ assessment for the uniformity of the sub-grade is commonly carried out by measuring the density of soil mass. Measurement of the density is done by cutting a core from the soil mass. According to ASTM D6951-09 (2009) the soil density may be estimated if the soil type and moisture content are known from the dynamic cone penetrometer (DCP) penetration rate. The DCP test is a soil-penetration test that is used for the measurement of sub-grade strength. In this paper, empirical correlations were developed for estimation of in situ density of the sub-grade material from DCP penetration rate and moisture content. These relations were developed using multi-linear regression analysis for different soils, namely Black Cotton Soil, Yellow Soil, and Moorum (lateritic soil). It also developed a generalized correlation for density using a power function model.
Author: Robert L. Mokwa
Author: Robert L. Mokwa
Author: David E. Newcomb
Author: Zahid Hossain
Author: E. S. Reddy
Author: Cheng Liu
Author: Keppel Coughlan
Author: D. G. True
Author: Ernest Theodore Selig
Author: K. Meshram
Author: Anand J. Puppala