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.
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.
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:
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:
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.
Download or read book Evaluation of Microwave Oven and Nuclear Asphalt Content Gauge written by John J. Germain and published by . This book was released on 1987 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This study was conducted to determine the feasibility of using a nuclear asphalt content gauge test procedure to measure the amount of asphalt in a bituminous mixture. A part of the vacuum and reflux test requires a moisture determination must be made; otherwise water extracted is shown as asphalt. Two advantages of using nuclear asphalt content gauges are: 1. Chemicals used in the vacuum extraction and moisture tests are very corrosive and consequently hazardous to handle. 2. The two procedures evaluated are simple and require less time than conventional procedures. Using these procedures may allow laboratory personnel more time for other duties. Results indicate the testing accuracy of the nuclear asphalt gauge when the temperature and density of the test specimen is controlled is at least as good as the vacuum or reflux extraction test procedure."--Technical report documentation p.
Download or read book Evaluation of Troxler 3241 C Nuclear Asphalt Content Gauge Used for Marshall Specimens written by Iyad Ahmed Alattar and published by . This book was released on 1994 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Investigation of Nuclear Asphalt Content Gauge written by Harold R. Paul and published by . This book was released on 1995 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: The introduction of new aggregate sources to Louisiana in the mid 1980s has presented problems in asphalt concrete mix design and construction. This study evaluated the operation and performance of the nuclear asphalt content gauge as a replacement for existing methods to reduce test time and eliminate the use of hazardous solvents. The variation in test results between centrifuge, reflux and the nuclear asphalt content gauge was evaluated for one week's production at six asphalt plants. Three batch plants and three drum plants were examined. Moisture content for the correction of nuclear content results was determined using both a microwave and the ASTM D1461 distillation method. Cold feed gradations were compared to extracted gradations from the samples tested for asphalt content. The pooled standard deviations for the nuclear asphalt content gauge were similar to the reflux extraction results regardless of plant type with the batch plant deviation slightly lower than the drum plant.
Download or read book Analysis of Asphalt Content Measured with Nuclear Gauges written by Yiping Wu and published by . This book was released on 1993 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Use of a Nuclear Asphalt Content Gauge written by Charles S. Hughes and published by . This book was released on 1968 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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:
Download or read book Nuclear Asphalt Content Gauge Study written by and published by . This book was released on 1988 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Download or read book Evaluation of Troxler 3241 Nuclear Apshalt Content Gauge written by Illinois. Department of Transportation. Bureau of Materials and Physical Research and published by . This book was released on 1983 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluation of the Nonnuclear Density Gauge for Quality Control of Hot mix Asphalt written by John W. Henault and published by . This book was released on 2010 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nuclear Asphalt Content Gauge written by Maine. Department of Transportation. Technical Services Division. Research and Development Section and published by . This book was released on 1990 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
