Development Length of High-Strength Steel Rebar in Ultrahigh Performance Concrete
01 Aug 2013-Journal of Materials in Civil Engineering (American Society of Civil Engineers)-Vol. 25, Iss: 8, pp 991-998
TL;DR: In this paper, the experimental results of the pullout and flexure tests conducted with high-strength steel (HSS) reinforcing rebar in shallow beams or slabs were investigated.
Abstract: Ultrahigh performance concrete (UHPC) is increasingly making its way into the construction field. Characterization of UHPC has therefore received much-needed attention in the research arena. One effective application of UHPC is in combination with high-strength steel (HSS) reinforcing rebar in shallow beams or slabs. However, bond and development characteristics of HSS rebar in UHPC have not yet been investigated. This paper presents the experimental results of the pullout and flexure tests conducted with HSS rebar in UHPC. This work was a part of a larger project to develop a new light-weight UHPC-HSS bridge deck system for a moveable bridge. Because the bridge deck was designed with #10 and #22 rebar as the main reinforcement, only these two rebar sizes were used in the experiments. First, pullout specimens were tested with three different embedment lengths of 8, 10, and 12 times the rebar diameter. Then, from the results of pullout specimens, beam specimens were tested with embedment lengths of...
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TL;DR: Harajli M, 2002, BOND CONCRETE RES ST, P570; Harajli MH, 2004, J MAT CIVIL ENG ASCE, V16; HARAJLI MH, 1995, ACI MATER J, V92, P343; Harjli MH as discussed by the authors, 2002 ACI STRUCTJ, V99, P509; Orangun C, 1975, 1543F U TEX AUST CTR; Zuo J.
Abstract: *ACI COMM 408, 1990, 4081R90 ACI; Darwin D, 1996, ACI STRUCT J, V93, P347; Eligehausen R, 1983, UCBEERC8323 U CAL; Esfahani MR, 1998, ACI STRUCT J, V95, P272; Filippou F, 1983, UCBEERC8319; HAMAD BS, 2002, IN PRESS ACI STRUCTU; Harajli M, 2002, J MATER CIVIL ENG, V14, P503, DOI 10.1061-(ASCE)0899-1561(2002)14:6(503); HARAJLI M, 2002, BOND CONCRETE RES ST, P570; HARAJLI MH, 2004, J MAT CIVIL ENG ASCE, V16; HARAJLI MH, 1995, ACI MATER J, V92, P343; Harajli MH, 2002, ACI STRUCT J, V99, P509; Orangun C, 1975, 1543F U TEX AUST CTR; Orangun C. O., 1977, ACI J, V74, P114; Zuo J, 2000, ACI STRUCT J, V97, P630
102 citations
TL;DR: In this article, the experimental determination of the bond behavior between ultra-high performance fiber-reinforced concrete (UHPFRC) and reinforcing bars (rebars) was carried out to assess the bond behaviour considering different rebar diameters, different embedment lengths and different concrete covers.
Abstract: This paper deals with the experimental determination of the bond behaviour between ultra-high performance fiber-reinforced concrete (UHPFRC) and reinforcing bars (rebars). An experimental campaign has been carried out to assess the bond behaviour considering different rebar diameters, different embedment lengths and different concrete covers. A relationship between bond strength, compressive strength and rebar diameter has been drawn from the results of this campaign and results found in the literature. Thanks to an original instrumentation method using Fiber-Optic Sensor, the local constitutive law linking the local relative displacement between UHPFRC and rebar and the bond stress has been determined and compared with the law proposed by fib Model Code 2010.
75 citations
TL;DR: In this paper, a series of bar pull out tests was performed in order to characterize the bond strength of a non-proprietary UHPC blend, and the tests were conducted using plain and epoxy-coated grade 60-bars with nominal diameters of 13mm, 16mm, and 19mm.
74 citations
TL;DR: In this article, an experimental investigation was carried out to evaluate the effect of fiber volume fraction and fiber orientation on the pullout behavior of steel reinforcement bar embedded in Ultra High Performance Concrete (UHPC).
46 citations
TL;DR: In this article, the cyclic load tests demonstrate that the cast-in-situ UHPC can work well with the precast reinforced concrete and there is no need of stirrups in the UHC joint zone.
45 citations
References
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01 Jan 2000
TL;DR: The 2003 AASHTO Subcommittee on Design, Task Force on Geometric Design was held in Charleston, South Carolina during the period July 13 through July 16, 2003 as mentioned in this paper and the purpose of the meeting was to review several documents undergoing revision, review the proposed revisions to the superelevation discussion in the Green Book, consider future research, and other administrative matters of concern to the Task Force Membership.
Abstract: The annual meeting of the AASHTO Subcommittee on Design, Task Force on Geometric Design was held in Charleston, South Carolina during the period July 13 through July 16, 2003. The purpose of the meeting was to review several documents undergoing revision, review the proposed revisions to the superelevation discussion in the Green Book, consider future research, and other administrative matters of concern to the Task Force Membership.
1,786 citations
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01 Jan 2008
541 citations
TL;DR: In this paper, the authors present the results of an experimental study undertaken to evaluate the characteristics of the local bond stress-slip response of reinforcing bars (RBs) embedded in plain and steel fibres.
Abstract: This paper presents the results of an experimental study undertaken to evaluate the characteristics of the local bond stress-slip response of reinforcing bars (RBs) embedded in plain and steel fibe...
177 citations
TL;DR: In this paper, the effect of several variables on bond capacity in high strength concrete is discussed and a failure hypothesis explaining the observed behavior during the experimental phase of the study is presented, and the current trend in ACI of making the splice length longer to compensate for having small cover and spacing may not be an effective approach.
Abstract: Because of the lack of test data, ACI-318-89 building code requirements imposed an arbitrary upper limit of 10,000 psi (69 MPa) on specified compressive strength of concrete that may be used in calculating tension development length and tension splice length. A research study was conducted to evaluate the bond performance of reinforcing bars embedded in high-strength concrete. Twelve beam splice specimens using No. 11 reinforcing bars and concrete with compressive strengths exceeding 14,000 psi were tested. The effect of several variables on bond capacity in high strength concrete is discussed and a failure hypothesis explaining the observed behavior during the experimental phase of the study is presented. Additionally, it is concluded that the current trend in ACI of making the splice length longer to compensate for having small cover and spacing may not be an effective approach. A better approach would be to provide a minimum amount of transverse reinforcement.
149 citations
TL;DR: In this paper, the influence of strain-softening and strain-hardening fiber-reinforced cementitious (FRC) composites on the bond strength and the bond stress-slip response of deformed reinforcing bars was investigated.
Abstract: Bond between deformed reinforcing bars and concrete induces significant tensile stresses that lead to cracking in concrete due to its weak and brittle nature in tension. Contrary to plain concrete and conventional fiber-reinforced concrete, high-performance fiber-reinforced cement composites (HPFRCC S ) show strain-hardening response under tension and, thus, their use can lead to enhanced bond performance. Pullout-type tests comprising various types of loadings were carried out to investigate the influence of strain-softening and strain-hardening fiber-reinforced cementitious (FRC) composites on the bond strength and the bond stress-slip response of deformed reinforcing bars. Test results showed that the bridging effect provided by fibers in FRC composites after cracking can effectively provide post-clacking tensile capacity to the concrete matrix and limit crack width, thereby leading to enhanced bond resistance. HPFRCC specimens gave the best bond performance in terms of bond strength and stiffness retention capacity, as well as damage-control ability.
147 citations