Download or read book Establishment of Reliable Methodologies to Determine In situ Moisture Content of Base and Subgrade Soils written by Richard Liu and published by . This book was released on 1999 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pavement life span is often affected by the amount of voids in the base and subgrade soils, and especially by the soil moisture content. Time Domain Reflectometry (TDR) and Ground Penetrating Radar (GPR) are two desirable techniques to indirectly measure the in-situ soil moisture content through electrical properties of soils. The pre-purchased Tektronix 1502B TDR Cable Tester equipped with Campbell Scientific SDM1502 Communications Interface and PS 1502B Power Control Module system was successfully modified, installed, and integrated into the existing weather station in conjunction with the Texas Mobile Load Simulator (TxMLS) research project. The test sections were located on US281 near Jacksboro, Texas. The TDR results from US281 test sites indicated that the TDR sensors responded to the rainfall events favorably. The two-year field test results indicated that the TDR readings interpreted by Topp's (1980) and Ledieu's (1986) equations agreed well with the real measured value for the subgrade; none of the existing models for the base layers was found to be suitable for the soil moisture content conversion used in this research study. An empirical equation was established to determine the weight-based moisture content of the compacted base materials. Although the TDR system provides valuable information, it requires considerable time and effort to process data. In addition, the TDR system consumed too much power and caused malfunctions of the weather station. In that regard, a new Moisture Sensor (MS) system was developed in this study and verified at the Materials and Tests (MAT) section of Texas Department of Transportation. The results from MAT section indicated that the MS system provides a more reliable solution than that of the TDR system. In addition, it is much easier to process the MS data. Furthermore, the MS system consumes almost no battery power and is an ideal solution for a long-term monitoring of pavement moisture content. GPR was also employed at the same test sites. The Inversion Method was applied for converting moisture content of soils. Laboratory tests were satisfactory; yet the field application of this study needs further experiments to improve the results.
Download or read book Special Report written by and published by . This book was released on 1989 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book First year Annual Operating Report for 2002 written by W. Ronald Hudson and published by . This book was released on 2005 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Evaluation of Conventional and Nuclear Methods for Determining In situ Density and Moisture Content of Soils written by Hugh L. Tyner and published by . This book was released on 1966 with total page 490 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book QA QC of Subgrade and Embankment Construction written by Eshan Ganju and published by . This book was released on 2015-09-01 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Dynamic Cone Penetrometer (DCP) is a device that is used for the estimation of in situ compaction quality of constructed subgrades and embankments. It is a relatively inexpensive, light-weight and easy to use device that measures the dynamic penetration resistance of the compacted soil, from which an estimate of soil strength and stiffness characteristics can be made. Owing to its ease of use, many DOTs in the U.S. have employed the DCP in their compaction quality control procedures, and over the past few decades, extensive research has been carried out on the development of correlations between the results of the DCP test and the results of strength and stiffness tests performed on compacted soils (e.g., California bearing ratio, and resilient modulus)The objectives of this research are to refine DCP-based quality assurance and quality control correlations for compaction quality control developed by previous research studies carried out at Purdue for the Indiana Department of Transportation, especially focusing on (1) grouping of the soils based on their mechanical response to the DCP loading, and (2) limiting the in situ moisture range of the soils used for development of correlations within -2% of the optimum moisture content of the tested soil. The factors outlined above are studied, and in particular, soil grouping is examined critically. The AASHTO ('A-based') classification employed previously for classification of soils is replaced with a new classification criteria specifically developed for the DCP test. Soils are grouped into one of the two categories of coarse-grained or fine-grained soils on the basis of the size of the dominant particle in the soil. The criteria developed for the classification of soil into one of these two categories is based on index properties of the soil, such as the standard Proctor maximum dry density, optimum moisture content, plasticity index (PI) and fines content.
Download or read book Report No FHWA RD written by United States. Federal Highway Administration. Offices of Research and Development and published by . This book was released on 1979 with total page 590 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Base Compaction Specification Feasibility Analysis written by and published by . This book was released on 2012 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this research is to establish the technical engineering and cost analysis concepts that will enable WisDOT management to objectively evaluate the feasibility of switching construction specification philosophies for aggregate base. In order to accomplish this goal, field and laboratory testing programs were conducted on existing HMA pavements and on base layers under construction as well as comprehensive survey was conducted on highway agencies practices pertaining to base layer construction in the U.S. and Canada. This research proposed construction specifications for aggregate base course layers.
Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1991 with total page 806 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Determination of Moisture Content of Soils in Situ written by CSIRO. Division of Soils and published by . This book was released on 1946 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Rapid Means of Determining Density and Moisture Content of Soils and Grandular Materials written by A. E. Schwartz and published by . This book was released on 1967 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bibliography on Methods and Apparatus for Determining Soil Moisture Content written by National Research Council (U.S.). Highway Research Board and published by . This book was released on 1950 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Report written by and published by . This book was released on 1964 with total page 896 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1991 with total page 806 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geotechnical Investigations and Improvement of Ground Conditions written by Anjan Patel and published by Woodhead Publishing. This book was released on 2019-01-31 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: Geotechnical Investigation and Improvement of Ground Conditions covers practical information on ground improvement and site investigation, considering rock properties and engineering geology and its relation to construction. The book covers geotechnical investigation for construction projects, including classic case studies with geotechnical significance. Additional sections cover soil compaction, soil stabilization, drainage and dewatering, grouting methods, the stone column method, geotextiles, fabrics and earth reinforcement, miscellaneous methods and tools for ground improvement, geotechnical investigation for construction projects, and forensic geotechnical engineering. Final sections present a series of site-specific case studies.
Download or read book Public Roads written by and published by . This book was released on 1980 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Special Report Highway Research Board written by National Research Council (U.S.). Highway Research Board and published by . This book was released on 1973 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Special Report written by National Research Council (U.S.). Highway Research Board and published by . This book was released on 1973 with total page 784 pages. Available in PDF, EPUB and Kindle. Book excerpt:
