Evaluation Of Admixtures For Use In Concrete To Be Placed Underwater
DOWNLOAD
Download Evaluation Of Admixtures For Use In Concrete To Be Placed Underwater PDF/ePub or read online books in Mobi eBooks. Click Download or Read Online button to get Evaluation Of Admixtures For Use In Concrete To Be Placed Underwater book now. This website allows unlimited access to, at the time of writing, more than 1.5 million titles, including hundreds of thousands of titles in various foreign languages. If the content not found or just blank you must refresh this page
Evaluation Of Admixtures For Use In Concrete To Be Placed Underwater
DOWNLOAD
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.
Evaluation Of Admixtures For Use In Concrete To Be Placed Underwater
DOWNLOAD
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.
Concrete without admixture and concrete containing either a plasticizer ('fluidifier') or a retarder were mixed and deposited underwater using the tremie method. The tremie used consisted of a pipe topped with a receiving funnel and plugged at the discharge end to keep the pipe sealed until filled with concrete. Tests were conducted with a number of batches of concrete to determine the slope and distance the concrete flowed. The tests were made to determine if these commercially available admixtures when used in concrete to be placed underwater increase the flowability of the concrete. Test results indicated that the use of either a retarding admixture or a plasticizer did not increase the flowability of equal-slump concrete, regardless of point of tremie discharge. The slope was not significantly affected by either a retarding admixture or a plasticizer. The concrete containing either a retarder or plasticizer appeared to be more cohesive and developed less laitance than equal-slump concrete without these admixtures. (Author).
Repair Evaluation Maintenance And Rehabilitation Research Program Evaluation Of Concrete Mixtures For Use In Underwater Repairs
DOWNLOAD
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.
Application Of Admixtures In Concrete
DOWNLOAD
Author : A.M. Paillere
language : en
Publisher: CRC Press
Release Date : 2004-03-01
Application Of Admixtures In Concrete written by A.M. Paillere and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004-03-01 with Architecture categories.
This book provides a thorough review of the properties and use of the principal chemical admixtures for use in concrete. Concise and clearly presented, the book includes extensive references to key sources of information. The presentation of each admixture is in a standard format, which helps the reader to find relevant information easily.
Underwater Concreting And Repair
DOWNLOAD
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. --
Evaluation Of Concrete Mixtures For Underwater Pile Repairs
DOWNLOAD
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 Concrete Mixtures For Use In Underwater Repairs
DOWNLOAD
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 Memodrandum
DOWNLOAD
Author : Waterways Experiment Station (U.S.)
language : en
Publisher:
Release Date : 1976
Technical Memodrandum written by Waterways Experiment Station (U.S.) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976 with categories.
Tremie Concrete For Massive Underwater Construction
DOWNLOAD
Author : Terence Charles Holland
language : en
Publisher:
Release Date : 1983
Tremie Concrete For Massive Underwater Construction written by Terence Charles Holland and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with categories.
Evaluation Of Water Reducing Admixtures In Portland Cement Concrete With High Amounts Of Microfine Aggregate
DOWNLOAD
Author : Scott Ronald Witthoft
language : en
Publisher:
Release Date : 2000
Evaluation Of Water Reducing Admixtures In Portland Cement Concrete With High Amounts Of Microfine Aggregate written by Scott Ronald Witthoft and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with categories.