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Effect Of Transverse Reinforcement On Bond Strength Of Reinfocement In Silica Fume Concrete
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Book Synopsis Effect of Transverse Reinforcement on Bond Strength of Reinfocement in Silica Fume Concrete by : Mahmoud Farouk Machaka
Download or read book Effect of Transverse Reinforcement on Bond Strength of Reinfocement in Silica Fume Concrete written by Mahmoud Farouk Machaka and published by . This book was released on 1997 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of silica fume has been steadily increasing all over the world as designers utilize the resulting high performance concrete (HPC) to increase the concrete compressive strength and to reduce or eliminate durability problems such as sulfate attack and corrosion. Very few researchers investigated the effect of silica fume on bond-slip characteristics of deformed bars in high performance concrete. Researchers who worked on this topic like Itani and Azizinamini, concluded that the presence of silica fume reduced the bond strength and induced a brittle mode of failure. They suggested the use of transverse reinforcement over the splice region in order to increase the bond strength and provide a ductile mode of failure. The objectives of the proposed research program were to investigate the effect of transverse reinforcement on the bond-slip characteristics of tension lap splices in high performance silica fume concrete, to study the validity of the upper limit of 70 MPa (10,000 psi) imposed by the ACI Building Code 318-95 on the concrete compressive strength for determination of development length, and to evaluate the reliability of the empirical equation of Orangun, Jirsa, and Breen in estimating the bond strength of deformed bars embedded in high strength concrete. Twelve beam specimens were tested. Each beam specimen included two bars in tension, spliced at the center of the span. The beams were designed in way that bars would fail in bond, splitting the concrete cover in the splice region, before reaching the yield point. The beams were loaded in positive bending with the splice in a constant moment region. The variables used were the percentage replacement by weight of cement by silica fume and the amount of confinement over the splice region. Test results indicated that silica fume decreased the bond strength and that specimens containing silica fume but without any transverse reinforcement in the splice region had a brittle, sudden and noisy mode of failure. The use of transverse reinforcement in the splice region increased the bond strength and the ductility of the mode of failure of the beam specimens. Minimum amounts of transverse reinforcement were recommended.
Book Synopsis Bond of Reinforcement in Silica Fume Concrete by : Maher Samir Itani
Download or read book Bond of Reinforcement in Silica Fume Concrete written by Maher Samir Itani and published by . This book was released on 1996 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the last 15 years, high performance concrete with compressive strength exceeding 70 MPa (10,000 psi) and ranging up to 120 MPa (17.0(H) psi) has been achieved consistently and utilized in bridges and high rise building construction. Production of this concrete depends on the use of very low water-to-cementitious material ratio with the aid of high-range water-reducers or superplasticizers. and on a careful selection and dosage of a mineral pozzolanic admixture such as silica fume. Little research is reported in the literature on the effect of pozzolans such as silica fume on structural behavior of reinforced concrete, namely on bond and anchorage characteristics of reinforcing bars in concrete. The objectives of the study were to investigate the effect of silica fume on bond and anchorage characteristics of reinforcing bars in high performance concrete, to study the validity of the upper limit of 70 MPa (10.000 psi) imposed by the AC! Building Code 318-95 on the concrete compressive strength for determination of development length, and to evaluate the reliability of the empirical equation of Orangun, Jirsa, and Breen in estimating the bond strength of deformed bars embedded in high strength concrete. Sixteen beam specimens were tested. Each beam was designed to include two bars in tension, spliced at the center of the span. The splice length was selected so that bars would fail in bond, splitting the concrete cover in the splice region, before reaching the yield point. The beams were loaded in positive bending with the splice in a constant moment region. The variables used were the percentage replacement by weight of cement by silica fume, casting position, and the superplasticizer dosage. Test results indicated that replacement of 5 to 20 percent of the cement by an equal weight of silica fume resulted in an average 10 percent reduction in bond strength regardless of casting position or the superplasticizer dosage used.
Book Synopsis Bond of Reinforcement in Eccentric Pullout Silica Fume Concrete Specimens by : Saad Mohannad Sabbah
Download or read book Bond of Reinforcement in Eccentric Pullout Silica Fume Concrete Specimens written by Saad Mohannad Sabbah and published by . This book was released on 1997 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 :fib Fédération internationale du béton Publisher :fib Fédération internationale du béton ISBN 13 :9782883940505 Total Pages :448 pages Book Rating :4.9/5 (45 download)
Book Synopsis Bond of Reinforcement in Concrete by : fib Fédération internationale du béton
Download or read book Bond of Reinforcement in Concrete written by fib Fédération internationale du béton and published by fib Fédération internationale du béton. This book was released on 2000-01-01 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: "In 1993, the CEB Commission 2 Material and Behavior Modelling established the Task Group 2.5 Bond Models. It's terms of reference were ... to write a state-of-art report concerning bond of reinforcement in concrete and later recommend how the knowledge could be applied in practice (Model Code like text proposal)... {This work} covers the first part ... the state-of-art report."--Pref.
Book Synopsis Role of Casting Position on Bond Strength of Reinforcement in Eccentric Pullout Silica Fume Concrete Specimens by : Rami Alexandre Akik
Download or read book Role of Casting Position on Bond Strength of Reinforcement in Eccentric Pullout Silica Fume Concrete Specimens written by Rami Alexandre Akik and published by . This book was released on 2001 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Transfer, Development, and Splice Length for Strand/reinforcement in High-strength Concrete by : Julio A. Ramirez
Download or read book Transfer, Development, and Splice Length for Strand/reinforcement in High-strength Concrete written by Julio A. Ramirez and published by Transportation Research Board. This book was released on 2008 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This report documents research performed to develop recommended revisions to the AASHTO LRFD Bridge Design Specifications to extend the applicability of the transfer, development, and splice length provisions for prestressed and non-prestressed concrete members to concrete strengths greater than 10 ksi. The report details the research performed and includes recommended revisions to the AASHTO LRFD Bridge Design Specifications. The material in this report will be of immediate interest to bridge designers."--Foreword.
Book Synopsis Correlation Between Transverse Reinforcement and Fibers in Confining Bond Critical Regions by : Shadi Sam Najjar
Download or read book Correlation Between Transverse Reinforcement and Fibers in Confining Bond Critical Regions written by Shadi Sam Najjar and published by . This book was released on 2001 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt: Several studies are reported in the literature on the effect of transverse reinforcement on bond and anchorage characteristics of reinforcing bars in normal and high strength concrete specimens. Transverse reinforcement provides concrete with confinement and increases its tensile resistance against splitting. When used to confine splices, transverse reinforcement leads to an increase in the bond capacity and to a more ductile and gradual mode of failure.--In 2000, a research program was carried out by Joumaa to study the effect of fiber reinforcement on bond strength and mode of failure of tension lap splices in high strength concrete. In this research, the effect of transverse reinforcement on bond strength and mode of failure of tension lap splices in beam specimens similar to those tested by Joumaa, will be investigated.
Book Synopsis Effects of Transverse Reinforcement on Bond Strength of Laps in Tension by : Koon Yuin Wong
Download or read book Effects of Transverse Reinforcement on Bond Strength of Laps in Tension written by Koon Yuin Wong and published by . This book was released on 1983 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :fib Fédération internationale du béton Publisher :fib Fédération internationale du béton ISBN 13 :2883940916 Total Pages :308 pages Book Rating :4.8/5 (839 download)
Book Synopsis Structural Concrete, Volume 1 by : fib Fédération internationale du béton
Download or read book Structural Concrete, Volume 1 written by fib Fédération internationale du béton and published by fib Fédération internationale du béton. This book was released on 2009-01-01 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Structural Applications of Fiber Reinforced Concrete by : Nemkumar Banthia
Download or read book Structural Applications of Fiber Reinforced Concrete written by Nemkumar Banthia and published by . This book was released on 1999 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Seventh International Symposium on Utilization of High Strength/ High Performance Concrete by : H. G. Russell
Download or read book Seventh International Symposium on Utilization of High Strength/ High Performance Concrete written by H. G. Russell and published by . This book was released on 2005 with total page 792 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book ACI Structural Journal written by and published by . This book was released on 2001 with total page 924 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fiber-Reinforced Cements and Concretes by : Colin D Johnston
Download or read book Fiber-Reinforced Cements and Concretes written by Colin D Johnston and published by CRC Press. This book was released on 2010-02-25 with total page 261 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book summarizes and simplifies the results of a considerable body of research and practical experience with a wide range of fiber-reinforced cementitious composites.
Book Synopsis Effect of Fiber Reinforcement on Bond Strength of Tension Lap Splices in High Strength Concrete by : Ghaida' Khaled Joumaa
Download or read book Effect of Fiber Reinforcement on Bond Strength of Tension Lap Splices in High Strength Concrete written by Ghaida' Khaled Joumaa and published by . This book was released on 2000 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt: To meet the objectives, 12 full-scale high strength concrete beam specimens were tested Each beam was designed with bars spliced in a constant moment region at midspan. The variables were bar size 20, 25, or 32 mm, and the amount of steel fiber reinforcement added in the splice region during casting: Vf = 0 5, 0 5, 1.0, or 2 0 %--The test results indicated that the use of steel fibers in the splice region increased the bond strength and the ductility of the mode of failure of the beam--specimens The increase in bond strength with high fiber content exceeded 3 square root fc, the maximum increase in bond strength of a reinforced concrete beam that could be achieved by using transverse reinforcement in the splice region.
Book Synopsis Research Report by : American University of Beirut
Download or read book Research Report written by American University of Beirut and published by . This book was released on 1995 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effects of Silica Fume and Steel Fibers on Some Mechanical Properties of High-Strength Fiber-Reinforced Concrete by : Ö Eren
Download or read book Effects of Silica Fume and Steel Fibers on Some Mechanical Properties of High-Strength Fiber-Reinforced Concrete written by Ö Eren and published by . This book was released on 1999 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: There are many test methods to measure the impact resistance of fiber-reinforced concrete that are complicated, time consuming, and expensive. A practical test method has been developed to measure the impact resistance of high-strength fiber-reinforced concrete (HSFRC). The equipment developed can also be used for testing aggregate impact values by simply changing the base plate of the machine. A machine was developed to measure the surface abrasion resistance of HSFRC. Testing fiber-reinforced concrete for surface abrasion resistance was found to be extremely difficult if realistic and practical results were desired. In this study the influence of silica fume on the properties of HSFRC was investigated by using silica fume at two different percentages and with three different hooked-end fibers, namely, 30/0.50, 60/0.80, and 50/0.60 length/diameter (mm/mm). Fibers were added to concrete in three different percentages of 0.5, 1.0, and 2.0% by volume of concrete. The results show that including fibers in high-strength concrete improves impact resistance, surface abrasion, and splitting tensile strength.
Download or read book ACI Structural Journal written by and published by . This book was released on 1996 with total page 796 pages. Available in PDF, EPUB and Kindle. Book excerpt:
