Repair Evaluation Maintenance And Rehabilitation Research Program Evaluation Of Concrete Mixtures For Use In Underwater Repairs
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Repair Evaluation Maintenance And Rehabilitation Research Program Evaluation Of Concrete Mixtures For Use In Underwater Repairs
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Author : Billy D. Neeley
language : en
Publisher:
Release Date : 1988
Repair Evaluation Maintenance And Rehabilitation Research Program Evaluation Of Concrete Mixtures For Use In Underwater Repairs written by Billy D. Neeley and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with categories.
Concrete mixtures were evaluated to determine which were most suited for placement underwater in thin lifts. The concretes were proportioned to have good workability, good abrasion erosion resistance, and good resistance to washing out of the cement paste. High-range water reducers (HRWR) were used to increase the workability and permit the use of low water cement ratios (W/C) to increase the resistance to abrasion erosion. Low W/C, silica fume, and antiwashout admixtures (AWA) were used to increase the resistance to washout. A washout test was used to determine the relative amount of cement paste lost when the concrete is exposed to a large volume of water. The two-point workability test was used to evaluate the relative workability properties of each mixture. The slump and air content were also measured for most of the mixtures. The test method for abrasion erosion resistance of concrete (underwater method) was used to determine the abrasion erosion resistance of each mixture. The results of these tests were used to determine the combination of materials necessary to produce concrete with the desired properties. Significant correlations that exist between the two-point measurements and washout measurements were examined. The effects that W/C, HRWR's, AWA's, fly ash, and silica fume have upon washout resistance and abrasion-erosion resistance were examined.
Repair Evaluation Maintenance And Rehabilitation Research Program Laboratory Evaluation Of Concrete Mixtures And Techniques For Underwater Repairs
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Author :
language : en
Publisher:
Release Date : 1990
Repair Evaluation Maintenance And Rehabilitation Research Program Laboratory Evaluation Of Concrete Mixtures And Techniques For Underwater Repairs written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with categories.
Concrete mixtures were placed underwater using six placement techniques to (a) examine the cohesive and flow parameters of selected concrete mixtures under different placement situations, (b) estimate those parameters necessary for successful underwater placement, (c) examine the quality of bonding of the repair concrete to the existing concrete, and (d) examine the effect of underwater placement upon the abrasion resistance of the concrete. A washout test was used to determine the relative amount of cement paste lost when the concrete is exposed to a large volume of water. The two-point workability test was used to evaluate the relative workability properties of the concrete. The slump, tremie flow, and air content were also measured. The test method for abrasion-erosion resistance of concrete (underwater method) was used to determine the abrasion-erosion resistance of each concrete. A point-load test for tensile strength was used to determine the bond strength of the repair concrete to the existing concrete.
Evaluation Of Concrete Mixtures For Use In Underwater Repairs
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Author : Billy Dale Neeley
language : en
Publisher:
Release Date : 1988
Evaluation Of Concrete Mixtures For Use In Underwater Repairs written by Billy Dale Neeley and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Concrete categories.
Repair Evaluation Maintenance And Rehabilitation Research Program Underwater Repair Of Concrete Damaged By Abrasion Erosion
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Author :
language : en
Publisher:
Release Date : 1991
Repair Evaluation Maintenance And Rehabilitation Research Program Underwater Repair Of Concrete Damaged By Abrasion Erosion written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with categories.
The grinding action of waterborne debris circulating in concrete stilling basins, open channels, navigation locks, and other hydraulic structures can lead to abrasion damage several feet in depth. Damaged areas need to be periodically repaired to ensure the functionality and safety of the hydraulic facility. Traditionally, these repairs have been carried out after dewatering the damaged area; however, such practice can interfere with the operations of the facility and can prove to be very costly. Therefore, it is desirable to carry out the repairs while the damaged portion of the structure is submerged. The objective of this research was to develop concrete mixtures and placement methods to repair typical scour holes underwater. Approximately 70 concretes were evaluated to optimize mixture proportions. The four most promising fluid concretes and one control concrete were selected to fill small and relatively shallow depressions underwater using the conventional tremie and the proposed inclined tremie methods. Concrete was placed in the laboratory in a test box with the bottom especially shaped to simulate a small scour hole. Surface profiles and in-place mechanical properties of eight underwater-cast slabs and one slab that was cast above water were evaluated to compare concrete mixtures and placement techniques.
Evaluation Of Concrete Mixtures For Use In Underwater Repairs
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Author : Billy D. Neeley
language : en
Publisher:
Release Date : 1988
Evaluation Of Concrete Mixtures For Use In Underwater Repairs written by Billy D. Neeley and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Concrete categories.
Technical Reports Awareness Circular Trac
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Author :
language : en
Publisher:
Release Date : 1988-08
Technical Reports Awareness Circular Trac written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988-08 with Science categories.
Repair Evaluation Maintenance And Rehabilitation Research Program Review Of The State Of The Art For Underwater Repair Using Abrasion Resistant Concrete
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Author : GERWICK (BEN C) INC SAN FRANCISCO CA.
language : en
Publisher:
Release Date : 1988
Repair Evaluation Maintenance And Rehabilitation Research Program Review Of The State Of The Art For Underwater Repair Using Abrasion Resistant Concrete written by GERWICK (BEN C) INC SAN FRANCISCO CA. and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with categories.
Concrete hydraulic structures that are subjected to severe abrasion require periodic inspection, evaluation, and repair. Not only are these procedures costly and sometimes disruptive, but repeated repairs also make guaranteeing the integrity of the underlying layers difficult. This review was conducted, on an international level, to identify new techniques and potential areas of research that might lead to more abrasion-resistant materials and more effective repair methods and that would avoid the high cost and disruptions associated with dewatering. Topics of study in the review include: (a) underwater inspection, (b) concrete mixtures, (c) underwater placement of concrete, (d) underwater compaction of concrete, (e) polymer concretes and coatings, (f) surface preparation, and (h) support vehicles. Keywords: Concrete admixtures, Hydro-valve, Pneumatic valves, Polymer concrete, Robotics, Support vessels.(jes).
Laboratory Evaluation Of Concrete Mixtures And Techniques For Underwater Repairs
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Author : Billy D. Neeley
language : en
Publisher:
Release Date : 1990
Laboratory Evaluation Of Concrete Mixtures And Techniques For Underwater Repairs written by Billy D. Neeley and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Concrete categories.
Repair And Rehabilitation Of Dams
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Author : James E. McDonald
language : en
Publisher: Washington, D.C. : U.S. Army Corps of Engineers, Engineer Research and Development Center
Release Date : 1999
Repair And Rehabilitation Of Dams written by James E. McDonald and has been published by Washington, D.C. : U.S. Army Corps of Engineers, Engineer Research and Development Center this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Arch dams Maintenance repair Case studies categories.
This study was conducted to identify methods that have been used in the repair and rehabilitation of concrete dams. Information was obtained through literary searches, discussions with project personnel, and visits to project sites. Each case history includes a background of the project, the deficiency that necessitated repair or rehabilitation, and descriptions of materials and methods used in the repair or rehabilitation. When available, the cost of the repair project and the performance of the repair to date have been included. Case histories included in this report cover a range of deficiencies in concrete structures, including cracking, spalling, erosion, leakage, inadequate PMF capacity, expansion resulting from alkali-aggregate reaction, instability, and insufficient storage capacity.
Annual Department Of Defense Bibliography Of Logistics Studies And Related Documents
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Author : United States. Defense Logistics Studies Information Exchange
language : en
Publisher:
Release Date : 1990
Annual Department Of Defense Bibliography Of Logistics Studies And Related Documents written by United States. Defense Logistics Studies Information Exchange and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Military research categories.