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Author: Mohamad Nagi Publisher: Strategic Highway Research Program (Shrp) ISBN: 9780309057516 Category : Portland cement Languages : en Pages : 275
Book Description
This report provides (1) state-of-the-art information on new developments in portland cement concrete materials and applications to users in the highway agencies, especially young engineers just beginning their careers in the field; and (2) new materials and testing methodologies for a variety of important highway and bridge rehabilitation applications. The report includes a condensation of the state-of-the-art synthesis of concrete highway technology prepared as part of this research project. Descriptions of evaluations of test methods for in-place concrete density with the use of nuclear methods and determination of water content of fresh concrete using microwave drying are also incorporated in the report. The report gives summaries of guidelines for avoiding thermal effects in concrete pavement slab placements and packing-based aggregate proportioning for concrete mixtures. The report contains a detailed description of field evaluations of a variety of concrete mixes used for early opening of full depth concrete pavement repairs and bridge deck overlays. Opening times ranged from 2 to 24 hours. Brief descriptions of the methodology and content of the HWYCON expert system, available from SHRP, are also included. Finally, a description of the contents of audiovisual implementation packages for highway personnel dealing with materials testing and pavement and bridge rehabilitation is included.
Author: Mohamad Nagi Publisher: Strategic Highway Research Program (Shrp) ISBN: 9780309057516 Category : Portland cement Languages : en Pages : 275
Book Description
This report provides (1) state-of-the-art information on new developments in portland cement concrete materials and applications to users in the highway agencies, especially young engineers just beginning their careers in the field; and (2) new materials and testing methodologies for a variety of important highway and bridge rehabilitation applications. The report includes a condensation of the state-of-the-art synthesis of concrete highway technology prepared as part of this research project. Descriptions of evaluations of test methods for in-place concrete density with the use of nuclear methods and determination of water content of fresh concrete using microwave drying are also incorporated in the report. The report gives summaries of guidelines for avoiding thermal effects in concrete pavement slab placements and packing-based aggregate proportioning for concrete mixtures. The report contains a detailed description of field evaluations of a variety of concrete mixes used for early opening of full depth concrete pavement repairs and bridge deck overlays. Opening times ranged from 2 to 24 hours. Brief descriptions of the methodology and content of the HWYCON expert system, available from SHRP, are also included. Finally, a description of the contents of audiovisual implementation packages for highway personnel dealing with materials testing and pavement and bridge rehabilitation is included.
Author: H. Thomas Yu Publisher: ISBN: Category : High strength concrete Languages : en Pages : 51
Book Description
The objective of this study was to monitor and evaluate the performance of experimental full-depth repairs made with high early-strength (HES) materials placed under Strategic Highway Research Program (SHRP) project C-206, Optimization of Highway Concrete Technology. The C-206 full-depth repair experiment was conducted to demonstrate and validate the technologies that allow early opening of full-depth portland cement concrete (PCC) pavement repairs to traffic and to document the information needed to apply this technology. The experimental factors for the full-depth repair experiment included material type, strength at opening, and repair length. A total of 11 different HES concrete mixes with opening times ranging from 2 to 24 hours were evaluated at 2 field sites (US. 1-20, Augusta, GA and State Route 2, Vermilion, OH). The scope of this study included 5-year monitoring of SHRP C-206 full-depth experiment sections, analyzing the data, and revising the guidelines for early opening of full-depth PCC pavement repairs as needed. The monitoring program consisted of annual visual distress surveys to monitor the development of cracking, faulting, and spalling. The annual surveys were conducted from the fall of 1994 through the fall of 1998. The results of this evaluation showed that full-depth repairs made wit1 HES PCC can provide good long-term performance; however, adverse temperature conditions during installation can cause premature failures. Extremely high PCC temperatures during curing should also be avoided. The fatigue damage due to early opening is negligible, especially for repairs of 3.7 m or shorter. Within the range of strength evaluated under SHRP C-206, the strength at opening could not be correlated to performance. Based on the results of this evaluation, no changes are recommended to the opening criteria suggested in the SHRP C-206 manual of practice.
Author: National Research Council Publisher: National Academies Press ISBN: 030905687X Category : Technology & Engineering Languages : en Pages : 125
Book Description
Nonconventional Concrete Technologies: Renewal of the Highway Infrastructure identifies research and development opportunities in innovative, nonconventional materials and processes that have the potential to accelerate the construction process, improve the durability of highway pavement and bridges, and enhance the serviceability and longevity of new construction under adverse conditions.
Author: Mohamad Nagi
Author: Mohamad Nagi
Author: H. Thomas Yu
Author: National Research Council
Author: National Institute of Standards and Technology (U.S.)
Author: M. Krukar
Author: 
Author: 
Author: Hesson Park
Author: United States. Federal Highway Administration
Author: