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Infrastructure Research Institute Scholarly Works: Recent submissions

Now showing items 101-120 of 339

    • Internal Curing and Supplementary Cementitious Materials in Bridge Decks 

      Lafikes, James; Khajehdehi, Rouzbeh; Feng, Muzai; O’Reilly, Matthew; Darwin, David (University of Kansas Center for Research, Inc., 2018-04)
      Supplementary cementitious materials (SCMs) are used in conjunction with pre-wetted fine lightweight aggregate to provide internal curing, producing high-performance, low-shrinking concrete to mitigate bridge deck cracking. ...

    • COMBINED EFFECTS OF INTERNAL CURING, SLAG, AND SILICA FUME ON DRYING SHRINKAGE OF CONCRETE 

      Pendergrass, Benjamin; Darwin, David; Khajehdehi, Rouzbeh; Feng, Muzai (University of Kansas Center for Research, Inc., 2017-08-01)
      This study evaluated drying shrinkage of concrete mixtures containing different replacement levels of total aggregate with pre-wetted lightweight aggregate (0, 8, and 10% by volume), replacements of cement with Grade 100 ...

    • Conventional and High-Strength Hooked Bars: Detailing Effects 

      Sperry, Jayne; Darwin, David; O’Reilly, Matthew; Lepage, Andrés; Lequesne, Rémy D.; Matamoros, Adolfo B.; Feldman, Lisa; Yasso, Samir; Searle, Nathaniel; DeRubeis, Michael; Ajaam, Ali Hussein (American Concrete Institute, 2018-01-01)
      Findings from a study on the effect of hook bend angle, concrete clear cover, and orientation of confining reinforcement on hook anchorage strength are presented. The range of test parameters was much broader than in ...

    • Compatibility of Shrinkage-Reducing and Air-Entraining Admixtures 

      Pendergrass, Benjamin; Darwin, David; Feng, Muzai; Khajehdehi, Rouzbeh (American Concrete Institute, 2017-09-01)
      The compatibility of two shrinkage-reducing admixtures (SRAs) with two air-entraining admixtures (AEAs)—one surfactant-based and one foaming polymer-based—was examined based on freezing and thawing durability, scaling ...

    • Anchorage of Headed Reinforcing Bars in Concrete 

      Ghimire, Krishna P.; Darwin, David; O’Reilly, Matthew (University of Kansas Center for Research, Inc., 2018-01)
      Headed reinforcing bars serve as a viable alternative to hooked bars for anchorage in concrete because they provide a more efficient anchorage mechanism and limit congestion of the reinforcement. This study is part of a ...

    • Use of Headed Bars as Shear Reinforcement 

      Lequesne, Rémy D.; O’Reilly, Matthew; Darwin, David; Lepage, Andrés; Al-Sabawy, Abdalkader; Guillen, Eduardo; Spradling, Donald (University of Kansas Center for Research, Inc., 2018-01)
      Thirty-nine beams with a shear span-to-depth ratio of 3 were tested with the goal of determining whether headed deformed bars can be used in reinforced concrete members in place of stirrups as shear reinforcement as well ...

    • Assessment of Moisture-Tolerant Coatings for Decreasing Open Top Construction Time 

      Keith, Christine; Dehghani Najvani, Mohammad Amin; O’Reilly, Matthew; Medina, Mario; Darwin, David; Abdul Baki, Ali Natheer; Nazzal, Luay Ali; Lee, Kyoung Ok (University of Kansas Center for Research, Inc., 2017-04)
      Open top construction is a practice commonly used in the construction of large structures, such as nuclear power plants, as it allows large equipment to be easily placed by lowering it into position from above. Doing so, ...

    • Variation of Concrete Strength, Permeability, and Porosity due to Specimen Type, Season, and Age 

      O’Reilly, Matthew; Darwin, David; Sperry, Jayne; Browning, JoAnn (University of Kansas Center for Research, Inc., 2017-01)
      Time and curing conditions may impact the strength and permeability of concrete. The strength and permeability of concrete with and without supplementary cementitious materials (SCMs) were evaluated as a function of specimen ...

    • Evaluation of Effects of Casting And Curing Conditions and Specimen Type on Concrete Strength and Permeability 

      O’Reilly, Matthew; Sperry, Jayne; Browning, JoAnn; Darwin, David (University of Kansas Center for Research, Inc., 2017-01)
      Time and curing conditions may impact the strength and permeability of concrete. The strength and permeability of concrete with and without supplementary cementitious materials (SCMs) were evaluated as a function of specimen ...

    • Corrosion Performance of Poorly Pickled Stainless Steel Reinforcement 

      O’Reilly, Matthew; Sperry, Jayne; Darwin, David; Lafikes, James; Somogie, Isaac; Storm, Scott; Browning, JoAnn (American Concrete Institute, 2017-11-01)
      XM-28 (UNS S24100) and 2304 (UNS S32304) stainless steel reinforcing bars with different levels of pickling were evaluated for corrosion resistance using the rapid macrocell and cracked beam tests outlined in ASTM A955. ...

    • Case for Changing Reinforcing Bar Deformation Spacing Requirements 

      Darwin, David; O’Reilly, Matthew; Browning, JoAnn; Xing, Lihua (ASTM International, 2014-01-20)
      The bond strength of four sets of reinforcing bars is evaluated, two each with No. 5 and No. 10 (No. 16 and No. 32) bars, which have, respectively, nominal diameters of 0.625 and 1.27 in. (15.9 and 32.3 mm). One bar of ...

    • Shear Strength of Lightly Reinforced T-Beams in Negative Bending 

      Rodrigues, Carlos Pinto; Darwin, David (American Concrete Institute, 1987)
      Nine restrained T-beams were tested in a study of negative moment region shear strength of lightly reinforced concrete T-beams. Variables included the longitudinal reinforcement ratio {rho} w (0.47 and 0.70 percent) and ...

    • Shear Strength of Lightly Reinforced T-Beams 

      Palaskas, Michael N.; Attiogbe, Emmanuel K.; Darwin, David (American Concrete Institute, 1981)
      Fifteen lightly reinforced concrete T-beams, 11 with stirrups and four without stirrups, were tested to failure. The major variables rit the study were the amounts of flexural and shear reinforcement. The flexural steel ...

    • Handbook of Test Methods for Evaluating Chemical Deicers 

      Chappelow, Cecil C.; McElroy, Albert Dean; Blackburn, Robert R.; Darwin, David; de Noyelles, Frank G.; Locke, Carl E., Jr. (Strategic Highway Research Program, 1992-11)
      This handbook contains a structured selection of specific test methods for complete characterization of deicing chemicals. Sixty-two specific test methods are defined for the evaluation of chemical deicers in eight principal ...

    • Earthquake-Resistant Fiber Reinforced Concrete Coupling Beams Without Diagonal Bars 

      Parra-Montesinos, Gustavo; Wight, James K.; Kopczynski, C.; Lequesne, Rémy D.; Setkit, M.; Conforti, A.; Ferzli, J. (American Concrete Institute, 2017-03-01)
      Results from large-scale tests on fibre-reinforced concrete coupling beams subjected to large displacement reversals are reported. The main goal of using fibre reinforcement was to eliminate the need for diagonal bars and ...

    • Elimination of Diagonal Reinforcement in Earthquake-Resistant Coupling Beams through Use of Fiber-Reinforced Concrete 

      Parra-Montesinos, Gustavo; Wight, James K.; Kopczynski, C.; Lequesne, Rémy D.; Setkit, M.; Conforti, A.; Ferzli, J. (American Concrete Institute, 2017)
      The design of reinforced concrete coupling beams in regions of high seismicity typically includes the use of diagonal bars designed to resist the entire shear demand, along with closely spaced transverse reinforcement to ...

    • Evaluation of Cracking Performance of Bridge Decks in Minnesota 

      Pendergrass, Benjamin; Shrestha, Pankaj Narayan; Riedel, Elizabeth; Polley, Grant; Darwin, David (University of Kansas Center for Research, Inc., 2013-10)
      Six bridge decks in Minnesota supported by steel girders were evaluated based on cracking performance. The decks included two constructed in accordance with Minnesota low-cracking specifications and four constructed in ...

    • Proposed Modifications to ACI 318-95 Tension Development and Lap Splice for High-Strength Concrete 

      Azizinamini, Atorod; Darwin, David; Eligehausen, Rolf; Pavel, Rob; Ghosh, S. K. (American Concrete Institute, 1999-11-01)
      Safety concerns and a lack of test data are responsible for the current upper limit of 100 psi on the square root of the concrete compressive strength for use in calculating tension development and lap splice lengths. Based ...

    • Anchorage Strength of Standard Hooked Bars in Simulated Exterior Beam-Column Joints 

      Yasso, Samir; Darwin, David; O’Reilly, Matthew (University of Kansas Center for Research, Inc., 2017-04)
      The current ACI hooked bar design provisions are based on test results of 38 simulated beam-column joints containing two hooked bars. The provisions address the effects of hooked bar surface condition, concrete cover, ...

    • Anchorage Strength of Reinforcing Bars With Standard Hooks 

      Ajaam, Ali Hussein; Darwin, David; O’Reilly, Matthew (University of Kansas Center for Research, Inc., 2017-04)
      Hooked bars are often used to anchor reinforcing steel where concrete dimensions are not sufficient to provide the required development length for straight reinforcement, such as in external beam-column joints. The purpose ...