{"title":"Effect of Very Fine Ground Glass Pozzolan on Fresh and Mechanical Properties of Ultra-High-Performance Concrete","authors":"N. Soliman, A. Omran, A. Tagnit-Hamou","doi":"10.21838/uhpc.9631","DOIUrl":"https://doi.org/10.21838/uhpc.9631","url":null,"abstract":"","PeriodicalId":170570,"journal":{"name":"Second International Interactive Symposium on UHPC","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121785226","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Carmen Maria Quist Batista, Larry Rowland, Erik Pram Nielsen
{"title":"The Next Generation of UHPC","authors":"Carmen Maria Quist Batista, Larry Rowland, Erik Pram Nielsen","doi":"10.21838/uhpc.9698","DOIUrl":"https://doi.org/10.21838/uhpc.9698","url":null,"abstract":"","PeriodicalId":170570,"journal":{"name":"Second International Interactive Symposium on UHPC","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114910625","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
D. Čítek, J. Vitek, R. Coufal, Adam Čítek, M. Kryštov, L. Kudrnáčová
{"title":"Experimental Verification of Concrete Elements Strengthened with UHPFRC","authors":"D. Čítek, J. Vitek, R. Coufal, Adam Čítek, M. Kryštov, L. Kudrnáčová","doi":"10.21838/uhpc.9716","DOIUrl":"https://doi.org/10.21838/uhpc.9716","url":null,"abstract":"","PeriodicalId":170570,"journal":{"name":"Second International Interactive Symposium on UHPC","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127007136","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Current design codes require a dense array of steel reinforcement for shear-critical structural elements in earthquake-resistant structures, such as columns, walls, coupling beams, and beam-column joints. However, this leads to congested reinforcement in such elements during construction, which could cause extensively prolonged construction and reduced construction quality. This paper aims to investigate the potential of utilizing Ultra-High Performance Concrete (UHPC) with hybrid fibers to reduce shear reinforcement in shear-critical structural elements. A series of UHPC beams reinforced with longitudinal steel bars and various combinations of hybrid fibers were tested in a four-point loading setup. Two different shear span-to-depth ratios were used to evaluate the effect of the hybridization in the shear response of the beam member. The test results showed that the presence of hybrid fibers enhanced the shear cracking stress, ultimate shear stress, and crack width controlled ability of the specimens compared to the beam swith monofibers. Due to the synergy of hybrid fibers, a smaller volume fraction of fibers was required for UHPC beams with hybrid fibers to show a shear strength comparable to the UHPC beams with monofibers
{"title":"Shear Behavior of Ultra-High Performance Hybrid Fiber Reinforced Concrete Beams","authors":"M. Bermudez, C. Hung","doi":"10.21838/UHPC.9736","DOIUrl":"https://doi.org/10.21838/UHPC.9736","url":null,"abstract":"Current design codes require a dense array of steel reinforcement for shear-critical structural elements in earthquake-resistant structures, such as columns, walls, coupling beams, and beam-column joints. However, this leads to congested reinforcement in such elements during construction, which could cause extensively prolonged construction and reduced construction quality. This paper aims to investigate the potential of utilizing Ultra-High Performance Concrete (UHPC) with hybrid fibers to reduce shear reinforcement in shear-critical structural elements. A series of UHPC beams reinforced with longitudinal steel bars and various combinations of hybrid fibers were tested in a four-point loading setup. Two different shear span-to-depth ratios were used to evaluate the effect of the hybridization in the shear response of the beam member. The test results showed that the presence of hybrid fibers enhanced the shear cracking stress, ultimate shear stress, and crack width controlled ability of the specimens compared to the beam swith monofibers. Due to the synergy of hybrid fibers, a smaller volume fraction of fibers was required for UHPC beams with hybrid fibers to show a shear strength comparable to the UHPC beams with monofibers","PeriodicalId":170570,"journal":{"name":"Second International Interactive Symposium on UHPC","volume":"353 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122791176","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
G. Morcous, S. Badie, M. Tadros, Mostafa Abo El-Khier, A. Zamani, Chaunbing Sun
This paper presents the development and experimental investigation of a new full depth precast concrete deck system that was developed within the NCHRP Project 12-96 as a simplified system for accelerated bridge construction. The system has the following features: shear connectors are located at the transverse joints only that are spaced up to 6 ft (1.8 m) in the longitudinal direction; transverse joints and shear connections are filled with UHPC that enables full composite behavior between the deck and the supporting girders; deck panels can be made solid or ribbed if deck weight reduction is desirable; and unique clustered shear connector assembly is used to resist large interface shear forces. The paper focuses on the role of using UHPC in achieving the goals of the new system and allowing the extension of the maximum spacing of shear connectors from 4 ft(1.2 m), currently specified by AASHTO LRFD Bridge Design Specifications, to 6 ft(1.8 m). This extension increases the interface shear demand and stress concentration at the joints by 50%, which necessitates the use of a grouting material with superior mechanical and durability properties, like UHPC.
{"title":"Innovative Full Depth Precast Deck Panel System with Discrete UHPC Joints at 6ft (1.8 m) Spacing","authors":"G. Morcous, S. Badie, M. Tadros, Mostafa Abo El-Khier, A. Zamani, Chaunbing Sun","doi":"10.21838/UHPC.9711","DOIUrl":"https://doi.org/10.21838/UHPC.9711","url":null,"abstract":"This paper presents the development and experimental investigation of a new full depth precast concrete deck system that was developed within the NCHRP Project 12-96 as a simplified system for accelerated bridge construction. The system has the following features: shear connectors are located at the transverse joints only that are spaced up to 6 ft (1.8 m) in the longitudinal direction; transverse joints and shear connections are filled with UHPC that enables full composite behavior between the deck and the supporting girders; deck panels can be made solid or ribbed if deck weight reduction is desirable; and unique clustered shear connector assembly is used to resist large interface shear forces. \u0000The paper focuses on the role of using UHPC in achieving the goals of the new system and allowing the extension of the maximum spacing of shear connectors from 4 ft(1.2 m), currently specified by AASHTO LRFD Bridge Design Specifications, to 6 ft(1.8 m). This extension increases the interface shear demand and stress concentration at the joints by 50%, which necessitates the use of a grouting material with superior mechanical and durability properties, like UHPC.","PeriodicalId":170570,"journal":{"name":"Second International Interactive Symposium on UHPC","volume":"83 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130370627","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
: There is an increasing interest in using ultra-high performance concrete (UHPC) and high-strength steel in steel-concrete composite structures. This paper makes a contribution towards this by experimentally investigating the axial compressive behavior of circular UHPC filled high-strength steel tube (UFHST) short columns. A total of nine UFHST columns were tested under axial compression. The test parameter was the steel tube diameter-to-thickness ratio (13 to 32). The steel yield stress was 961 MPa (139.35 ksi), and the compressive strength of UHPC (without steel fibers) was 142 MPa (20.59 ksi). Results from the test indicated that the strength of the UFHST columns increased with decreasing steel tube diameter-to-thickness ratios. Two limit states were observed from the tests, i.e., shear failure of the concrete infill and local buckling of the steel tube. The governing limit states depend on the steel tube diameter-to-thickness ratio. Moreover, the strength enhancement and ductility of UFHST columns were discussed by using performance indices such as concrete contribution ratio (CCR), strength index (SI) and ductility index (DI). It was demonstrated that UFHST columns with thicker tube wall had better ductility, while leading to less strength enhancement or composite action. (4) Here, The confinement factor ξ is the nominal strength ratio of steel tube to concrete infill; A s and A c are the cross-sectional areas of steel tube and concrete infill, respectively; f y and f c are the steel yielding stress and the cylinder concrete compressive strength, respectively; N u,filled represents the axial bearing capacity of UFHST columns; N u,hollow denotes the axial bearing capacity of hollow steel tubes measured in the test; 𝛿 u is the axial shortening at N u,filled ; 𝛿 95% is the axial shortening when the load falls to 95% N u,filled (95% N u,filled is used instead of 85% N u,filled , because the load drop after the peak load is less than 15% for some specimens in this paper, such
在钢-混凝土组合结构中使用超高性能混凝土(UHPC)和高强度钢的兴趣越来越大。本文通过对圆形超高强度混凝土填充高强钢管(UFHST)短柱轴压特性的试验研究，对此做出了贡献。共对9根UFHST柱进行了轴压试验。试验参数为钢管径厚比(13 ~ 32)。钢的屈服应力为961 MPa (139.35 ksi)，不含钢纤维的UHPC的抗压强度为142 MPa (20.59 ksi)。试验结果表明，随着钢管径厚比的减小，UFHST柱的强度增大。试验观察到两种极限状态，即混凝土充填体的剪切破坏和钢管的局部屈曲。控制极限状态取决于钢管的径厚比。采用混凝土贡献率(CCR)、强度指数(SI)和延性指数(DI)等性能指标对UFHST柱的强度增强和延性进行了探讨。结果表明，管壁较厚的UFHST柱延性较好，但强度增强或复合作用较小。(4)式中，约束系数ξ为钢管与混凝土填充物的标称强度比;A s、A c分别为钢管截面面积和混凝土填充截面面积;F、F分别为钢屈服应力和柱状混凝土抗压强度;N u，填充为UFHST柱轴向承载力;N u，空心为试验所测空心钢管的轴向承载力;𝛿u为N u处轴向缩短量，填充;𝛿95%为荷载降至95% N u时的轴向缩短量，填充(95% N u，填充代替85% N u，填充，由于本文部分试件峰值荷载后的荷载下降小于15%，故采用95% N u，填充
{"title":"Axial compressive behavior of circular UHPC filled high-strength steel tube (UFHST) short columns","authors":"Jiangang Wei, Xia Luo, Z. Lai, Bao-chun Chen","doi":"10.21838/uhpc.9630","DOIUrl":"https://doi.org/10.21838/uhpc.9630","url":null,"abstract":": There is an increasing interest in using ultra-high performance concrete (UHPC) and high-strength steel in steel-concrete composite structures. This paper makes a contribution towards this by experimentally investigating the axial compressive behavior of circular UHPC filled high-strength steel tube (UFHST) short columns. A total of nine UFHST columns were tested under axial compression. The test parameter was the steel tube diameter-to-thickness ratio (13 to 32). The steel yield stress was 961 MPa (139.35 ksi), and the compressive strength of UHPC (without steel fibers) was 142 MPa (20.59 ksi). Results from the test indicated that the strength of the UFHST columns increased with decreasing steel tube diameter-to-thickness ratios. Two limit states were observed from the tests, i.e., shear failure of the concrete infill and local buckling of the steel tube. The governing limit states depend on the steel tube diameter-to-thickness ratio. Moreover, the strength enhancement and ductility of UFHST columns were discussed by using performance indices such as concrete contribution ratio (CCR), strength index (SI) and ductility index (DI). It was demonstrated that UFHST columns with thicker tube wall had better ductility, while leading to less strength enhancement or composite action. (4) Here, The confinement factor ξ is the nominal strength ratio of steel tube to concrete infill; A s and A c are the cross-sectional areas of steel tube and concrete infill, respectively; f y and f c are the steel yielding stress and the cylinder concrete compressive strength, respectively; N u,filled represents the axial bearing capacity of UFHST columns; N u,hollow denotes the axial bearing capacity of hollow steel tubes measured in the test; 𝛿 u is the axial shortening at N u,filled ; 𝛿 95% is the axial shortening when the load falls to 95% N u,filled (95% N u,filled is used instead of 85% N u,filled , because the load drop after the peak load is less than 15% for some specimens in this paper, such","PeriodicalId":170570,"journal":{"name":"Second International Interactive Symposium on UHPC","volume":"486 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133847808","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Hain, A. Zaghi, T. Fields, Rabih Barakat, Andrew Cardinali, M. Culmo, Tomas Lopata
{"title":"Implementation of UHPC for the Repair of a Steel Bridge with Corrosion Damage in CT","authors":"A. Hain, A. Zaghi, T. Fields, Rabih Barakat, Andrew Cardinali, M. Culmo, Tomas Lopata","doi":"10.21838/uhpc.9684","DOIUrl":"https://doi.org/10.21838/uhpc.9684","url":null,"abstract":"","PeriodicalId":170570,"journal":{"name":"Second International Interactive Symposium on UHPC","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117255392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"UHPC Overlay at Three Bridge Interchange in Elsmere, DE","authors":"William A. Geshrei, Zachary M. Gabay","doi":"10.21838/uhpc.9720","DOIUrl":"https://doi.org/10.21838/uhpc.9720","url":null,"abstract":"","PeriodicalId":170570,"journal":{"name":"Second International Interactive Symposium on UHPC","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133881223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"The Ultra Girder: A Design Concept for a 300-foot Single Span Prestressed Ultra-High Performance Concrete Bridge Girder","authors":"R. El-Helou, B. Graybeal","doi":"10.21838/uhpc.9707","DOIUrl":"https://doi.org/10.21838/uhpc.9707","url":null,"abstract":"","PeriodicalId":170570,"journal":{"name":"Second International Interactive Symposium on UHPC","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125752022","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Uniaxial Compression Behavior of Ultra-High Performance Concrete Confined by Steel Spirals","authors":"Negar Naeimi, M. Moustafa","doi":"10.21838/uhpc.9663","DOIUrl":"https://doi.org/10.21838/uhpc.9663","url":null,"abstract":"","PeriodicalId":170570,"journal":{"name":"Second International Interactive Symposium on UHPC","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127838964","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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