Expert/knowledge-based Systems for Cement and Concrete PDF Download
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Author: Lawrence J. Kaetzel
Publisher:
ISBN:
Category : Expert systems (Computer science)
Languages : en
Pages : 274
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Book Description
Author: Lawrence J. Kaetzel
Publisher:
ISBN:
Category : Expert systems (Computer science)
Languages : en
Pages : 274
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Book Description
Author: Donald J. Janssen
Publisher: Strategic Highway Research Program (Shrp)
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 228
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Book Description
This study, aimed at improving the freeze-thaw resistance of concrete, consists of three parts. Part I evaluates parameters affecting the freeze-thaw durability of concrete. A modification of the existing standard of method for determining the durability factor of concrete specimens is proposed, and a new procedure for fundamental transverse frequency (used in durability factor calculations) has been developed. Part II focuses on developing better methods for identifying nondurable aggregates, and has resulted in a rapid new test based on the hydraulic fracture of aggregates. Part III describes field experiments to evaluate the freeze-thaw resistance of a number of specified concrete mixes and the use of sealants to mitigate D-cracking. Preliminary field performance results are presented.
Author: Todd D. Hanson
Publisher:
ISBN:
Category : Pavements, Concrete
Languages : en
Pages : 246
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Book Description
"The objective of this report is to document various changes in specifications, pavement design and equipment for PCC paving from the early 1900s to present. This includes changes that were made to the specification book and supplemental specifications"--Technical report title page.
Author:
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 238
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Book Description
Author:
Publisher:
ISBN:
Category : Pavements, Concrete
Languages : en
Pages : 300
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Book Description
In Phase I, the research team contacted each of 16 participating states to gather information about concrete and concrete material tests. A preliminary suite of tests to ensure long-term pavement performance was developed. The tests were selected to provide useful and easy-to-interpret results that can be performed reasonably and routinely in terms of time, expertise, training, and cost. The tests examine concrete pavement properties in five focal areas critical to the long life and durability of concrete pavements: (1) workability, (2) strength development, (3) air system, (4) permeability, and (5) shrinkage. The tests were relevant at three stages in the concrete paving process: mix design, preconstruction verification, and construction quality control. In Phase II, the research team conducted field testing in each participating state to evaluate the preliminary suite of tests and demonstrate the testing technologies and procedures using local materials.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 174
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Book Description
Author: FIB – International Federation for Structural Concrete
Publisher: FIB - Féd. Int. du Béton
ISBN: 2980676225
Category : Technology & Engineering
Languages : en
Pages : 650
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Book Description
Author:
Publisher:
ISBN:
Category : Highway engineering
Languages : en
Pages : 580
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Book Description
Author:
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 456
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Book Description
Author: Mohsen A. Issa
Publisher:
ISBN:
Category : Aggregates (Building materials)
Languages : en
Pages : 170
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Book Description
An evaluation was funded by the Illinois Department of Transportation (ILDOT) to investigate the ability of the Washington Hydraulic Fracture Test (WHFT) to identify D-cracking susceptible aggregate. Two machines were used for testing: the large (WHFT 97) which was fabricated at the University of Illinois at Chicago and the smaller chamber (WHFT 94). The WHFT 97 is completely automated in terms of controlling the entire testing procedure for each respective 10 cycles of operation, and requires minimal manual labor. Twenty-one different aggregate samples, with different degrees of freeze-thaw susceptibility, were tested according to the WHFT test procedure on both machines to establish a direct correlation, if possible, between the results of the proposed WHFT test and those reported for the ASTM C 666 Method B as modified by ILDOT. In addition, a petrographic analysis was conducted on each aggregate sample in order to determine its percentage of air voids, pore size, and pore size distribution. The pore size distribution, as well as the durability factor of all the aggregates, were also determined. Unfortunately, a comparison of WHFT to ASTM C 666 Method B (ILDOT modified) test results showed a lack of direct correlation across the vast majority of the 21 test samples. This lack of direct correlation precludes the use of the WHFT test as a direct replacement for the ASTM C 666 Method B test procedure. Since a direct correlation was not established, the test data were compared using the two test methods failure modes to establish the WHFT 97's potential as a screening test. All the aggregate types (dolomite, gravel, ACBF slag) were successfully classified using these failure modes with the exception of one aggregate type, limestone. It appears, based on this comparison, the WHFT 97 test may have the potential to be used as a screening test prior to the ASTM freeze-thaw test. In addition, the percentage of air voids test showed potential in rating limestone aggregate as to what other testing would have to be run to identify D-cracking susceptible aggregate. Additional research is recommended to increase reliability for both the WHFT 97 test as a screening procedure and use of the percentage of air voids test to identify testing necessary on limestones. A wider range of durable and non-durable sources for each aggregate type will have to be investigated.
