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Development Of Nondestructive Methods For Measurement Of Slab Thickness And Modulus Of Rupture In Concrete Pavements
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Book Synopsis Development of Nondestructive Methods for Measurement of Slab Thickness and Modulus of Rupture in Concrete Pavements by : John S. Popovics
Download or read book Development of Nondestructive Methods for Measurement of Slab Thickness and Modulus of Rupture in Concrete Pavements written by John S. Popovics and published by . This book was released on 2005 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes work to develop non-destructive testing methods for concrete pavements. Two methods, for pavement thickness and in-place strength estimation, respectively, were developed and evaluated. The thickness estimation method is based on a new hybrid approach that combines frequency domain (impact-echo) and time domain (seismic) data. This new method makes use of a fuller understanding of the dynamic wave phenomenon, which was developed during the course of the work. The effects of material property gradients (due to aggregate segregation and moisture variation) through the slab thickness are compensated for in the method. A field testing method is proposed, described, and experimentally verified. Verification tests carried out on full-scale concrete slabs cast on granular base show that the new method provides more accurate thickness estimates than those obtained by the standard impact-echo procedure. On average, the error between predicted thickness and actual thickness determined by cores is less than 6 mm, although some individual estimates exceed this error value. However, the new method does not work on concrete over asphalt or cement-treated base (which accounts for most concrete pavements) or on full-depth asphalt concrete pavements. The in-place strength estimation method is based on ultrasonic surface wave measurements. A field test method is proposed, described, and experimentally verified. Verification tests carried out on a range of concrete mixtures with varying aggregate type and cementitious material, all of which satisfy the requirements of "A3" concrete as specified by the Virginia Department of Transportation. Two data analysis procedures are proposed. One procedure predicts flexural strength within 50 psi of actual strength determined by direct strength measurement of beams, although the procedure requires 1-day strength and ultrasonic values to be known. The second procedure is more flexible but provides strength estimates with lower accuracy. Field tests, which were carried out at two pavement sites in Virginia, are reported for both methods. Finally, a detailed description of the required testing equipment and experimental and analytical procedures for both methods are included in the Appendix. Cost savings from implementing the methods are not obvious, since the methods cannot be used to measure the thickness of most concrete pavements for acceptance and payment. The methods can be used to nondestructively evaluate the modulus of rupture of pavements for analysis purposes, but savings would depend on the nature of the analysis.
Book Synopsis Measurement of Pavement Thickness by Rapid and Nondestructive Methods by : S. D. Howkins
Download or read book Measurement of Pavement Thickness by Rapid and Nondestructive Methods written by S. D. Howkins and published by . This book was released on 1968 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt: The feasibility is investigated of various acoustic (sonic), nuclear, and electrical techniques for nondestructive measurement of Portland cement and bituminous concrete pavement thickness both during and after construction. Recommendations are made for equipment development and field testing of three specific methods that could potentially result in such measurements with the desired degree of speed and accuracy.
Author :ASTM Committee D-18 on Soil and Rock. Subcommittee D-4 on Road and Paving Materials Publisher :ASTM International ISBN 13 :9780803118652 Total Pages :546 pages Book Rating :4.1/5 (186 download)
Book Synopsis Nondestructive Testing of Pavements and Backcalculation of Moduli by : ASTM Committee D-18 on Soil and Rock. Subcommittee D-4 on Road and Paving Materials
Download or read book Nondestructive Testing of Pavements and Backcalculation of Moduli written by ASTM Committee D-18 on Soil and Rock. Subcommittee D-4 on Road and Paving Materials and published by ASTM International. This book was released on 1994 with total page 546 pages. Available in PDF, EPUB and Kindle. Book excerpt: The proceedings of June 1993 international symposium held in Atlanta, Georgia, called specifically to develop and standardized evaluation procedures for non-destructive methods of testing pavements. The 29 papers discuss analytical models and techniques, measurement and calculation techniques in the field and laboratory, problems and errors associated with backcalculation methods and design parameters, and testing for other pavement uses. Also includes a history of the quest for a standard and the status of that effort. Reproduced from typescripts. Annotation copyright by Book News, Inc., Portland, OR
Book Synopsis Nondestructive Testing of Pavements and Backcalculation of Moduli by : Albert Jasper Bush
Download or read book Nondestructive Testing of Pavements and Backcalculation of Moduli written by Albert Jasper Bush and published by ASTM International. This book was released on 1989 with total page 701 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Use of the Impact-echo Method in Nondestructive Measurements of the Thickness of New Concrete Pavements by : Gerardo G. Clemeña
Download or read book Use of the Impact-echo Method in Nondestructive Measurements of the Thickness of New Concrete Pavements written by Gerardo G. Clemeña and published by . This book was released on 1995 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: The nondestructive impact-echo (IE) method offers a simple means for introducing compressional stress waves into a concrete element or slab and measuring the resonance frequencies associated with the reflections of the waves from any internal voids and the bottom of the slab. It is relatively effective for detecting internal voids or delaminations in concrete, which is the application for which it was developed. It may also be possible to use the method for indirect measurement of the thickness of a slab if the wave propagation velocity in the concrete is known. This study was conducted to determine whether the IE method, by itself, could replace the use of coring for quality-assurance measurements of the thickness of concrete slabs in newly built pavements. The results from tests conducted on three pavemems indicated that the wave velocity varied so much, not only between pavements but also within a pavement, that unacceptable errors can result when an average velocity is determined (through limited coring) for a pavemem and subsequently assumed for the entire pavement. To reduce the error to an acceptable level, the wave velocity at any test location must be measured to within an acceptable accuracy by another independent method. In pursuit of this approach, an indirect-transmission procedure based on ultrasonic (UT) measurement was incorporated and tested. This combined IE/UT procedure was able to measure thickness with absolute errors of 5 mm in one pavement and 7 mm in another, at a 90% probability. These results can be considered encouraging since the current procedure requires that the length of a core reported to the nearest 3 mm be the average of several measurements around the core and, in some cores, these measurements can have a spread of as much as 13 mm. In addition, it is expected that these errors can be reduced easily with the use of a transducer with a smaller contact face that would be less sensitive to roughness on the surface of grooved concrete pavements.
Book Synopsis A Nondestructive Device for Measuring the Thickness of Concrete Pavements by :
Download or read book A Nondestructive Device for Measuring the Thickness of Concrete Pavements written by and published by . This book was released on 2005 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Non-destructive Measurement of Pavement Layer Thickness by : Kenneth R. Maser
Download or read book Non-destructive Measurement of Pavement Layer Thickness written by Kenneth R. Maser and published by . This book was released on 2003 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Concrete Pavement Design and Performance by : National Research Council (U.S.). Transportation Research Board
Download or read book Concrete Pavement Design and Performance written by National Research Council (U.S.). Transportation Research Board and published by . This book was released on 1986 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurements of the Thickness of In-place Concrete with Microwave Reflection by : Gerardo G. Clemeña
Download or read book Measurements of the Thickness of In-place Concrete with Microwave Reflection written by Gerardo G. Clemeña and published by . This book was released on 1988 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: Previous microwave reflection measurements made on simple, unreinforced concrete blocks have shown that the transit time of a microwave through concrete is linearly related to its thickness. In this study measurements were conducted on concrete slabs that were built to simulate pavements and on an actual continuously reinforced concrete pavement to determine whether this type of rapid nondestructive measurement could be used in lieu of coring in the inspection of newly built concrete pavements for compliance with slab thickness specifications. It was found that reflections from the bottom of a concrete pavement slab may often be too weak and difficult to identify in a radar profile; therefore, the transit time of a microwave through reinforced concrete slab would often be difficult to measure with reasonable accuracy. The results obtained with radar measurements made on simulated pavement slabs showed that radar was only able to indicate whether a slab is too thin (i.e., less than 8 in); but those measurements made on an actual pavement yielded reasonably good agreement between the thickness determined by coring and those determined by reflection measurements in conjunction with a calibration procedure. Based on these mixed results, it would be difficult to predict how reliable radar would be for precise quantitative measurement of slab thickness of a particular pavement until an actual radar scan of the pavement has been conducted. If the reflection from the bottom of the slab appeared to be identifiable, then the calibration procedure could be used to determine the slab thickness for the entire pavement. Otherwise, radar can be used at least as a screening tool to spot areas in the pavement that appear to be to thin. These areas would then be cored to verify the radar readings.
Book Synopsis Accelerated Rigid Paving Techniques by :
Download or read book Accelerated Rigid Paving Techniques written by and published by . This book was released on 1994 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report represents nearly 6 years of collaboration among Federal Highway Administration (FHWA), State, and American Concrete Pavement Association (ACPA) engineers on the subject of Fastrack Concrete Paving. As an outgrowth of activities begun in 1986 in Storm Lake, Iowa, a Technical Working Group (TWG) assembled under the auspices of the FHWA's Special Project 201. Since the first meeting in Alexandria, Virginia, in 1988, the TWG has cooperated to construct pilot projects, test concrete material with the FHWA's mobile laboratory, sponsor workshops and conferences nationwide, simulate exercises on urban project designs, complete ACPA's Technical Bulletin on Fastrack, and support follow-on research. This report formally completes activities carried out under SP-201. It presents key information on opening-to-traffic criteria and pavement slab temperature management. It includes a summary of key projects built around the country in the last 6 years. It also includes a copy of ACPA's new bulletin and closes with reprints of several technical reports that may be of interest to the reader.
Download or read book Magazine of Concrete Research written by and published by . This book was released on 1949 with total page 662 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Determination of Pavement Thickness with a New Ultrasonic Device by : Mark Richard Baker
Download or read book Determination of Pavement Thickness with a New Ultrasonic Device written by Mark Richard Baker and published by . This book was released on 1995 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Texas Department of Transportation (TxDOT) spends a significant amount of money and effort to perform concrete coring. Coring in normally done to monitor the thickness and/or quality of PCC slabs during construction. Because a considerable amount of time is required to perform the procedure, it is done at widely spaced intervals. As a result, the most critical points, in terms of strength or thickness, are sometimes not tested. The development of reliable and fast nondestructive testing (NDT) equipment capable of determining the thickness and quality of concrete is desirable. With it, slabs could be tested at closely spaced points and at a fraction of the cost and time of coring. The University of Texas at El Paso (UTEP), under a contract with the Strategic Highway Research Program (SHRP), has developed a comprehensive NDT device to diagnose problems with pavement at early stages. As part of the SHRP project, a technique for determining the thickness of PCC slabs has been implemented. This technology has been packaged as an inexpensive device for nondestructively determining the thickness of PCC slabs.
Download or read book Transportation Research Record written by and published by . This book was released on 1974 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Journal of the American Concrete Institute by : American Concrete Institute
Download or read book Journal of the American Concrete Institute written by American Concrete Institute and published by . This book was released on 1974 with total page 656 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :American Association of State Highway and Transportation Officials Publisher :AASHTO ISBN 13 :1560510552 Total Pages :622 pages Book Rating :4.5/5 (65 download)
Book Synopsis AASHTO Guide for Design of Pavement Structures, 1993 by : American Association of State Highway and Transportation Officials
Download or read book AASHTO Guide for Design of Pavement Structures, 1993 written by American Association of State Highway and Transportation Officials and published by AASHTO. This book was released on 1993 with total page 622 pages. Available in PDF, EPUB and Kindle. Book excerpt: Design related project level pavement management - Economic evaluation of alternative pavement design strategies - Reliability / - Pavement design procedures for new construction or reconstruction : Design requirements - Highway pavement structural design - Low-volume road design / - Pavement design procedures for rehabilitation of existing pavements : Rehabilitation concepts - Guides for field data collection - Rehabilitation methods other than overlay - Rehabilitation methods with overlays / - Mechanistic-empirical design procedures.
Book Synopsis Third International Conference on Concrete Pavement Design and Rehabilitation by :
Download or read book Third International Conference on Concrete Pavement Design and Rehabilitation written by and published by . This book was released on 1985 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Development of an Expert System for Nondestructive Pavement Structural Evaluation by : Yein-Juin Chou
Download or read book Development of an Expert System for Nondestructive Pavement Structural Evaluation written by Yein-Juin Chou and published by . This book was released on 1989 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt:
