Author: Vincent RacanelliPublisher:
ISBN:
Category :
Languages : en
Pages : 194
Book Description
Analysis of Initial Concrete Testing in Relation to Expected Performance
Author: Vincent RacanelliTesting of Concrete in Structures
Author: John H. BungeyPublisher: CRC Press
ISBN: 0203965140
Category : Technology & Engineering
Languages : en
Pages : 353
Book Description
Providing a comprehensive overview of the techniques involved in testing concrete in structures, Testing of Concrete in Structures discusses both established techniques and new methods, showing potential for future development, and documenting them with illustrative examples. Topics have been expanded where significant advances have taken place in the field, for example integrity assessment, sub-surface radar, corrosion assessment and localized dynamic response tests. This fourth edition also covers the new trends in equipment and procedures, such as the continuation of general moves to automate test methods and developments in digital technology and the growing importance of performance monitoring, and includes new and updated references to standards. The non-specialist civil engineer involved in assessment, repair or maintenance of concrete structures will find this a thorough update.
Government Reports Announcements & Index
Author: Evaluation of Applications of DELVO Technology
Author: Steven A. RaganPublisher:
ISBN:
Category : Concrete
Languages : en
Pages : 196
Book Description
Computer-aided Analysis of Concrete Strength Test Results
Author: Roy L. CampbellPublisher:
ISBN:
Category : Concrete
Languages : en
Pages : 96
Book Description
Aggregate Tests Related to Asphalt Concrete Performance in Pavements
Author: Prithvi S. KandhalPublisher: Transportation Research Board
ISBN: 9780309062596
Category : Technology & Engineering
Languages : en
Pages : 116
Book Description
Developing a Simple and Rapid Test for Monitoring the Heat Evolution of Concrete Mixtures for Both Laboratory and Field Applications, Phase III
Author: Publisher:
ISBN:
Category : Pavements
Languages : en
Pages : 192
Book Description
The objective of this research project is to identify, develop, and evaluate a simple, economical, and reliable calorimetry device and test method for monitoring heat evolution of pavement concrete. The project contains three phases: phase I - identifying user needs for calorimeter tests, phase II - identifying potential calorimeter devices and developing test procedures, and phase III - verifying the test procedures and the potential applications of calorimetry in field. In this report, the work done in phases I and II is briefly summarized and the study of phase III is presented. The phase III study includes three parts: (1) field calorimetry tests, (2) lab tests for the field materials, and (3) implementation of calorimetry into pavement performance prediction. The field tests were conducted at three selected sites: US 71 (Atlantic, Iowa), Highway 95 (Alma Center, Wisconsin), and US 63 bypass (Ottumwa, Iowa). A simple isothermal calorimetry and two semi-adiabatic calorimetry (AdiaCal and IQ drum) tests were conducted at these sites. The general concrete, such as slump, air content, unit weight, placement temperature, ASTM C403 set time, and pavement properties, such as subbase temperature and sawing time were also measured. In the lab tests of the field materials, nine robust mixes for each field site, with different variations in water reducer and/or fly ash dosages were developed. AdiaCal and isothermal calorimeter tests were performed for each of the robust mixes. IQ drum and ASTM C403 set time tests were conducted for selected mixes. To implement the calorimetry test results into concrete performance prediction, the HIgh PERformance PAVing (HIPERPAV) computer program was modified, the calculated hydration curve parameters from selected calorimetry tests were used as inputs for the modified HIPERPAV program, and the temperature developments of in-situ pavements were then predicted. The phase III test results confirmed the major findings drawn in the phase II study. The results indicate that both the AdiaCal and semi-adiabactic calorimetry tests can provide valuable information on concrete performance. AdiaCal calorimetry is particularly good for field concrete set time prediction, and it is sensitive to the sample temperature. Isothermal calorimetry can provide users more detailed information on cement hydration and provide more consistent test results. The thermal set times obtained from both the AdiaCal and isothermal calorimetry tests are closely related to those measured from the ASTM C403 tests. Using the calorimetry test curve as inputs for the HIPERPAV computer program, in-situ concrete pavement temperatures can be predicted adequately.
Government Reports Annual Index
Author: Publisher:
ISBN:
Category : Government reports announcements & index
Languages : en
Pages : 1688
Book Description
Handbook on Nondestructive Testing of Concrete
Author: V.M. MalhotraPublisher: CRC Press
ISBN: 1420040057
Category : Technology & Engineering
Languages : en
Pages : 387
Book Description
Civil and structural engineering consultants engaged in quality control or investigations of hardened concrete need a comprehensive resource that explains the methods of determining strength and other performance characteristics. Handbook on Nondestructive Testing of Concrete, Second Edition answers this demand by providing a thorough analys
Deicer Scaling Resistance of Concrete Pavements, Bridge Decks, and Other Structures Containing Slag Cement, Phase I
Author: Scott Michael SchlorholtzPublisher:
ISBN:
Category : Pavements, Concrete
Languages : en
Pages : 122
Book Description
The initial phase of this project was conducted to determine whether adding slag cement to concrete mixtures increases the surface scaling caused by the routine application of deicer salt. A total of 28 field sites that included portland cement concrete pavements and bridge decks containing slag cement were evaluated. Laboratory testing was conducted on 6 in. diameter core samples extracted from 12 field sites and 3 subsites, including 6 pavement sites and 6 bridge decks. The laboratory testing program consisted of scaling tests, rapid chloride permeability tests, surface chloride profile tests, and petrographic examination. The results of this study suggest that construction-related issues played a bigger role in the observed scaling performance than did the amount of slag in the concrete mixture. For the scaling tests, only cores extracted from one site exhibited scaling mass loss values that exceeded 1.5 lbs/yd2. It was also noted that the bridge deck cores tended to lose more mass during the scaling tests than the pavement cores. For the rapid chloride permeability tests, the amount of charge passed did not appear to be directly related to the amount of slag in the mixtures. However, the different ages of the concrete at the various sites tended to complicate the interpretation of the test results. For the surface chloride profile tests, the diffusion coefficients estimated for the various samples ranged from about 5.6E-12 m2/s to 1.4E-13 m2/s. Petrographic examinations indicated that four of the seven sites that exhibited scaling showed evidence of retempering. In addition, two of the scaling sites tended to have significantly higher water-cementitious material ratios than was expected from the nominal mixture design information that was provided.