Evaluation Of Concrete Mixtures For Use In Underwater Repairs
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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.
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.
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 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.
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.
Evaluation Of Concrete Mixtures For Underwater Pile Repairs
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Author : KH. Khayat
language : en
Publisher:
Release Date : 1991
Evaluation Of Concrete Mixtures For Underwater Pile Repairs written by KH. Khayat and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Admixtures categories.
Repair of submerged concrete piles that have undergone considerable loss in cross section and strengthening of existing marine piles often involves jacketing the piles and filling the annular spacings between the jackets and the piles with concrete. In this paper, physical and mechanical properties that are deemed necessary to secure high-quality concrete under water were evaluated for numerous mixtures. Four concrete mixtures were selected to repair 2.4-m (8-ft)-high mock-up piles located above water. Rigid rectangular forms were erected around the 203-mm (8-in.)-square mock-up piles. The resulting annular spacings between these forms and the mock-up piles were first filled with water and then with concrete. The concrete was discharged within previously placed unhardened concrete to minimize segregation and water dilution rather than allowed to fall through water. Once the repair had set, the exposed surface of each underwater-cast pile was examined for any signs of segregation. Cores were obtained to evaluate the in-situ density and compressive strength of the concrete, as well as the bond strength between the underwater-cast concrete and the central mock-up pile. The testing program indicates that concrete mixtures containing antiwashout admixtures and either silica fume or fly ash can secure higher quality repairs, at equal or lower costs, than similar concretes made with high silica fume or high cement contents and no antiwashout admixtures. Properly proportioned concrete mixtures resulted in exposed repair surfaces free of segregation, with mean in-place compressive strength in excess of 58.6 MPa (8500 psi). The in-situ density of such concrete was identical to that cast and consolidated above water, and the bond strength to existing mock-up piles was in excess of 2.1 MPa (300 psi).
Evaluation Of Admixtures For Use In Concrete To Be Placed Underwater
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Author : William O. Tynes
language : en
Publisher:
Release Date : 1976
Evaluation Of Admixtures For Use In Concrete To Be Placed Underwater written by William O. Tynes and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976 with Concrete categories.
Underwater Concreting And Repair
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Author : Andrew McLeish
language : en
Publisher: Hodder Education
Release Date : 1994-09-27
Underwater Concreting And Repair written by Andrew McLeish and has been published by Hodder Education this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994-09-27 with Technology & Engineering categories.
Presents techniques of applying and repairing concrete in freshwater and marine environments for the practicing engineer. Covers materials, inspection, defect evaluation, repair methods, and factors influencing long-term durability of concrete underwater. Includes numerous diagrams and photos. Enables engineers to identify and overcome the many problems associated with concreting in both fresh and sea water. Focuses on the major factors influencing long term durability of concrete in the underwater environment. Discusses inspection, evaluation of defects and methods of repair for existing underwater structures. --
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).
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.