[PDF] Role Of Casting Position On Bond Strength Of Reinforcement In Eccentric Pullout Silica Fume Concrete Specimens eBook

Author : Rami Alexandre Akik
Publisher :
Page : 364 pages
File Size : 50,95 MB
Release : 2001
Category :
ISBN :

GET BOOK

This thesis reports on a study designed to investigate the effect of silica fume, bar size, and concrete confinement on the bond-slip characteristics of bottom cast reinforcing bars anchored in eccentric pullout silica fume specimens. The main objective was to assess the effect of casting position by comparing the test results with those of top cast specimens tested earlier and identical except for the casting position.--Forty-eight eccentric pullout specimens were tested. The variables were the percentage replacement by mass of cement by silica, the concrete cover over the reinforcing bar, and the bar size. Failure of the specimens were governed by the splitting of the concrete cover over the anchored bar.--The test results indicated that as the percentages silica fume increased, the maximum load capacity and the stiffness of the load-slip curve of the bottom cast bar decreased regardless of the bar size or the concrete cover used. The reduction in the ultimate load due to presence of silica fume was independent of casting position. Companion bottom and top cast anchored bars developed similar ultimate load capacity regardless of the percentage replacement silica fume.

Author : Saad Mohannad Sabbah
Publisher :
Page : 324 pages
File Size : 18,53 MB
Release : 1997
Category :
ISBN :

GET BOOK

The work reported in this thesis is the third phase of a multiphase research program conducted at the American University of Beirut to investigate and assess the effect of silica fume on the bond and anchorage characteristics of reinforcing steel bars in high performance concrete (HPC). The objective of the research work was to investigate the effect of specimen type and specimen size on the role of silica fume in the bond strength of the reinforcing bars, and to evaluate the effect of bar size and concrete confinement on the anchorage characteristics of the reinforcing bars in silica fume concrete. The specimen consisted of a deformed bar embedded 25 mm (10 in.) in a 305 mm x 305 mm x 254 mm (12 x 12 x 10 in.) concrete block. The short embedment length was chosen to avoid yielding of the bar before bond splitting failure takes place. The small size of the specimen allowed testing a large number of specimens to cover different variables. The main variables were the percentage replacement by weight of cement by silica fume (0, 4, 8, 12, 16, or 20 percent), the concrete cover over the reinforcing steel bar (25 mm or 50 mm), and the bar size (25 mm or 32 mm). The test results showed that as silica fume content increass, there is a reduction in load-slip stiffness of the specimens regardless of the bar size or concrete cover used. The test results also showed that the bar size does not affect the anchorage characteristics of the reinforcing bars in silica fume concrete. Finally, the results also indicate that the concrete confinement slightly improves the bond resistance in concrete containing more than 10 percent silica fume.

Author : Jacques Resplendino
Publisher : John Wiley & Sons
Page : 678 pages
File Size : 37,71 MB
Release : 2013-01-29
Category : Technology & Engineering
ISBN : 1118587553

GET BOOK

This book contains the proceedings of the international workshop “Designing and Building with Ultra-High Performance Fibre-Reinforced Concrete (UHPFRC): State of the Art and Development”, organized by AFGC, the French Association for Civil Engineering and French branch of fib, in Marseille (France), November 17-18, 2009. This workshop was focused on the experience of a lot of recent UHPFRC realizations. Through more than 50 papers, this book details the experience of many countries in UHPFRC construction and design, including projects from Japan, Germany, Australia, Austria, USA, Denmark, the Netherlands, Canada... and France. The projects are categorized as novel architectural solutions, new frontiers for bridges, new equipments and structural components, and extending the service life of structures. The last part presents major research results, durability and sustainability aspects, and the updated AFGC Recommendations on UHPFRC.

Author : Ivan Marković
Publisher : IOS Press
Page : 232 pages
File Size : 10,25 MB
Release : 2006
Category : Technology & Engineering
ISBN : 9789040726217

GET BOOK

"In the research project presented in this PhD-thesis, an innovative type of fibre concrete is developed, with improved both the tensile strength and the ductility: the Hybrid-Fibre Concrete (HFC). The expression "Hybrid" refers to the "hybridisation" of fibres: short and long steel fibres were combined together in one concrete mixture. This is opposite to conventional steel fibre concretes, which contain only one type of fibre. The basic goal of combining short and long fibres is from one side to improve the tensile strength by the action of short fibres, and from the other side to improve the ductility by the action of long fibres." "In this research project, all important aspects needed for the development and application of Hybrid-Fibre Concrete have been considered. In total 15 mixtures, with different types and amounts of steel fibres were developed and tested in the fresh state (workability) as well as in the hardened state (uniaxial tensile tests, flexural tests, pullout tests of single fibres and compressive tests). A new analytical model for bridging of cracks by fibres was developed and successfully implemented for tensile softening response of HFC. At the end, the utilisation of HFC in the engineering practice was discussed, including a case-study on light prestressed long-span beams made of HFC."--BOOK JACKET.

Author : Duff A. B. 1880 Abrams
Publisher : Palala Press
Page : 248 pages
File Size : 27,75 MB
Release : 2016-05-02
Category :
ISBN : 9781355200208

GET BOOK

This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work.This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.

Author : Jack C. McCormac
Publisher :
Page : 744 pages
File Size : 37,81 MB
Release : 2005
Category : Technology & Engineering
ISBN :

GET BOOK

Publisher Description

Author : Paul Zia
Publisher :
Page : 262 pages
File Size : 18,65 MB
Release : 1991
Category : Fiber-reinforced concrete
ISBN :

GET BOOK

This state-of-the-art report summarizes the results of an extensive search and review of available literature on the mechanical properties of concrete, with particular reference to high performance concrete for highway applications. Included in the review and discussion are the behavior of plastic concrete as well as the strength and deformation characteristics of hardened concrete. Both short-term and long-term effects are considered. Based on the review of the available information, research needs are identified. It is concluded that much research is needed to develop data on the strength and durability properties of concrete which develops high strength, particularly very early strength.