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Book Evaluation of a Nuclear Asphalt Concrete Gage

Download or read book Evaluation of a Nuclear Asphalt Concrete Gage written by George L. Regan and published by . This book was released on 1975 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Evaluation of New Nuclear Density Gauges on Asphalt Concrete

Download or read book Evaluation of New Nuclear Density Gauges on Asphalt Concrete written by Garnell Belt and published by . This book was released on 1991 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Evaluation of Nuclear Asphalt Content Gage

Download or read book Evaluation of Nuclear Asphalt Content Gage written by George L. Regan and published by . This book was released on 1975 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt: The developments of nuclear asphalt content gages were reviewed and gage operation and use were studied in the laboratory to determine significant parameters that may affect nuclear gage results. Two Troxler Model 2226 Asphalt Content Gages, serial Nos. 307 and 308, were used in this study. Parameters investigated were (a) asphalt content; (b) moisture content; (c) aggregate gradation; (d) interactions of (a), (b), and (c); (e) sample size; and (f) sample temperature. Precision and accuracy experiments were conducted. These included (2 sup n) factorial experiments and stepwise multiple linear regression analyses of the results. Asphalt content determinations equaling or bettering those of the conventional extraction technique were obtained in considerably less time.

Book An Evaluation of the Potential Use of Non nuclear Density Gauges for Asphalt Concrete Acceptance

Download or read book An Evaluation of the Potential Use of Non nuclear Density Gauges for Asphalt Concrete Acceptance written by Alex K. Apeagyei and published by . This book was released on 2011 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes the results of a study using non-nuclear density gauges (NNDGs) to measure the in-situ density of asphalt concrete (AC) material in Virginia. The study compared the NNDG results with those obtained from the use of two traditional AC density acceptance methods: the core method (AASHTO T 166) and the nuclear density gauge (NDG) method. Although these two methods are the most widely used methods of accepting AC density, the core method is time-consuming and destructive and involves bulky test setups and the NDG method, although portable and non-destructive, is associated with safety concerns related to the presence of radioactive materials in the gauge. The purpose of the study was to evaluate the use of two NNDGs as a potentially safe, portable, and expedient method of measuring AC density-a key indicator of pavement performance. The direct comparison of NNDG and core density and the acceptance rates with the use of NNDGs and NDGs were the focus of the study. Extensive field and laboratory tests were conducted to determine AC density using two models of NNDGs (i.e., the Troxler PaveTracker Plus and the TransTech Model PQI 301) and one model of an NDG (i.e., the Troxler Model 4640-B). Density measurements of AC cores/plugs taken at gauge testing locations were conducted in the laboratory in accordance with AASHTO T 166 for comparisons. The results of the field testing showed that NNDG measurements were not well correlated with core density or NDG measurements. However, there was good agreement between readings from NNDGs and NDGs in terms of identifying core cutting locations (67%), control strip acceptance (75%), and test section acceptance (95%). This apparent contradiction between the acceptance rate among the gauges and the poor correlation could be explained by the relatively low ranges in measured field density (0-5 lb/ft3), which is within the precision ranges of the gauges used. The results of additional laboratory testing of 10 AC slabs with air void contents ranging from about 3% to 20% confirmed the results of the field testing. Specifically, they demonstrated that compared with NDGs, NNDGs were less sensitive, with an average relative bias of 19.6 lb/ft3 and 9.6 lb/ft3 for the PQI 300 and the PaveTracker Plus, respectively, compared with 2.2 lb/ft3 for the NDG. The results also showed that results from use of the NNDGs were not well correlated with core density measured in accordance with AASHTO T 166, which is generally accepted as the most accurate method of measuring density. The study concludes that NNDGs of the types used in the study are not suitable for measuring AC density for acceptance purposes and thus are not recommended for use as density acceptance tools in Virginia.

Book Evaluation of Nuclear Asphalt Content Gauges

Download or read book Evaluation of Nuclear Asphalt Content Gauges written by and published by . This book was released on 1989 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Evaluation of a Nuclear Asphalt Content Gage

Download or read book Evaluation of a Nuclear Asphalt Content Gage written by Charles S. Hughes and published by . This book was released on 1970 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Troxler Model 2226 asphalt content gauge was evaluated in the laboratory and taken into the field where its results were compared to conventional reflux values. The precision as evaluated in the laboratory was found to be excellent - equivalent to .06% asphalt content with a 45 second count. The gauge does have to be recalibrated each time a different aggregate is used and as a practical matter should be recalibrated for each different mix type. Sample preparation is important and samples should be as uniform as possible. The accuracy appears to be as good as that of the reflux extractor. A recommendation for using the nuclear gauge is appended.

Book Evaluation of Non nuclear Density Gauges for HMAC

Download or read book Evaluation of Non nuclear Density Gauges for HMAC written by Stephen Sebesta and published by . This book was released on 2003 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes research efforts to determine if commercially available non-nuclear density gauges can be used for TxDOT's density profile and joint density testing procedures. Researchers conducted testing with a Troxler 3450 nuclear gauge (operated in the thin-lift mode) and the Pavetracker (PT) and Pavement Quality Indicator (PQI) non-nuclear gauges. In a laboratory setting, research showed all the gauges could be affected by mix temperature, where gauge readings typically decreased with decreasing mix temperature. All gauges readings were also impacted by moisture, with the nuclear gauge least impacted. The precision of all gauges in the lab was good, with standard deviations below 0.5 pcf with the non-nuclear gauges and less than 1.0 pcf with the nuclear gauge. Field-testing showed the PQI was a suitable alternative to the nuclear gauge for density profiling and joint density testing.

Book Evaluation of the Troxler Model 3241 B Asphalt Content Gauge

Download or read book Evaluation of the Troxler Model 3241 B Asphalt Content Gauge written by Richard J. Holmgreen and published by . This book was released on 1988 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents the results of an evaluation of the Troxler 3241-B Asphalt Content Gauge. Based on these findings, the asphalt content gauge is an accurate and reliable piece of equipment that can readily be used in the field environment. The importance of specific procedures and their influence on measurements obtained are discussed in detail.

Book Nuclear Cement Content Gage Comparison Analysis

Download or read book Nuclear Cement Content Gage Comparison Analysis written by S. C. Shah and published by . This book was released on 1977 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study is concerned with the laboratory evaluation of two prototypes of a nuclear gage for measuring the cement content of plastic concrete. The dependence of the gages' responses on aggregate type and proportions, cement content, and temperature were studied.

Book Nuclear Test Equipment Investigation

Download or read book Nuclear Test Equipment Investigation written by Donald Inghram and published by . This book was released on 1971 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This is a report of an evaluation of nuclear methods of measuring the density of compacted asphaltic concrete"--P. [i].

Book Evaluation of a Nuclear Gage for Controlling the Consolidation of Fresh Concrete

Download or read book Evaluation of a Nuclear Gage for Controlling the Consolidation of Fresh Concrete written by Hamdi Celik Ozyildirim and published by . This book was released on 1981 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt: Evaluated was an approach to controlling the consolidation of in-place portland cement concrete on the basis of densities obtained with a Troxler 3411 nuclear gage. The gage was used in the backscatter mode on low-slump concrete bridge deck overlays and in both the backscatter and the direct transmission modes on continuously reinforced concrete pavements. The nuclear gage readings were compared to rodded unit weight determinations by ASTM C138. It was found that the nuclear readings compared favorably with the unit weight values. However, a petrographic examination of the cores taken from the deck and pavement indicated the presence of coarse voids in amounts exceeding those found in adequately consolidated concretes. It is concluded that the variability in density resulting from acceptable variations in the grading and amounts of individual ingredients of concrete, including the air content, is of the same order of magnitude or greater than the variability resulting from small but detrimental amounts of large air voids. Consequently, matching nuclear densities with densities obtained by weight per volume measurements does not assure the absence of small but detrimental excesses of large voids. However, the presence of an appreciable amount of honeycombing or excessive air entrainment would be detected by nuclear density measurements.

Book Evaluation of New Asphalt Concrete Density Specification

Download or read book Evaluation of New Asphalt Concrete Density Specification written by G. W. Maupin and published by . This book was released on 1988 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this investigation was to evaluate a new asphalt concrete density specification that utilizes a nuclear gauge and a control strip technique. The specification was studied on two field projects, and recommendations were made to improve it. The recommendations were to eliminate the correction factor, increase the number of density determinations, adopt a uniform policy in establishing the Marshall density, and provide instruction concerning roller patterns.