Dr. Khayat is professor of Civil Engineering and director of the Center for Infrastructure Engineering Studies at Missouri University of Science and Technology (Missouri S&T). He serves as director of the University Transportation Center for Research on Concrete Applications for Sustainable Transportation (RE-CAST), a consortium of five U.S.-based universities. Prior to joining Missouri S&T in 2011, he spent 21 years on the faculty at the Department of Civil Engineering at the Université de Sherbrooke and served as Chair professor of the National Science and Engineering Research Council industrial chair on high-performance flowable concrete with adapted rheology. Dr. Khayat specializes in the design and performance of advanced construction materials and has conducted pioneer work in the field of rheology and high-performance concrete. He is the recipient of several honors and awards, including Fellow of ACI, Fellow of RILEM, 2015 ACI Arthur R. Anderson Medal, and 2014 G.H. Tattersall Award. Dr. Khayat has served on several technical committees for ACI, RILEM, TRB, and CSA, including ACI 237 on self-consolidating concrete (Chair, and Secretary) and RILM TC228 Mechanical Properties of self-consolidating concrete (Chair).
U.S. Transportation Collection2020PDFTech ReportKhayat, Kamal H.Research on Concrete Applications... more U.S. Transportation Collection2020PDFTech ReportKhayat, Kamal H.Research on Concrete Applications for Sustainable Transportation (RE-CAST)Missouri University of Science and TechnologyUnited States. Department of Transportation. Office of the Assistant Secretary for Research and TechnologyUnited States. Department of Transportation. University Transportation Centers (UTC) ProgramResearch on Concrete Applications for Sustainable Transportation (RE-CAST)United StatesAdmixturesCorrosion resistanceFiber reinforced concreteFlexural strengthReinforcing barsRheological propertiesSynthetic fibersTensile strengthAdapted RheologyRECAST UTC # 00064859DTRT13-G-UTC45Final Report, Period: 09/01/18 \u2013 12/31/19The main objectives of this project can be summarized as follows: 1. Optimize the SRA-fiber system of SCC and SWC mixtures to achieve superior performance, including properties, autogenous shrinkage, restrained shrinkage, mechanical properties (tensile and compressive strength), frost durability, and transport properties. The investigation will include the Eclipse 4500 SRA, or equivalent, and two types of synthetic fibers (i.e., STRUX and SINTA from GCP). 2. Evaluate the effect of rheological properties of fiber alignment along the casting-flow direction of structural elements. The rheological properties of concrete will be modified using a viscosity modified admixture (VMA), such as V-MAR from GCP. The incorporation of VMA can improve the stability of the concrete mixture and distribution of the fibers. 3. Investigate the corrosion resistance of reinforcing bars in pre-cracked FR-SCC and FR-SWC mixtures. The cracking will be controlled to achieve different widths for mixtures with different fibers. The transport properties of the concrete matrix will also be investigated. 4. Evaluate the enhancement in tensile/flexural toughness and shrinkage/crack resistance of FRC made with partially replacement of the steel reinforcement in flexural members with different types of and combinations of the STRUX and SINTA fibers.105
2020PDFTech ReportKhayat, Kamal H.Missouri University of Science and Technology. Center for Trans... more 2020PDFTech ReportKhayat, Kamal H.Missouri University of Science and Technology. Center for Transportation Infrastructure and SafetyMissouri. Department of Transportation. Construction and Materials DivisionMissouri. Department of Transportation. Construction and Materials DivisionUnited StatesAdmixturesBridge constructionCorrosion resistanceCrackingDurabilityFiber reinforced concreteFlexural strengthPerformance based specificationsShrinkageSteel fibersStructural analysisBridgeEco-Bridge-CreteExpansive admixtureFlexural strengthSteel reinforcementStructural performancecmr 20-006MoDOT project # TR201806Final Report (December 1, 2017-May 1, 2020)The main objective of this research is to propose novel materials for the construction and retrofitting of bridges, including Economical Crack-Free High-Performance Concrete (Eco-Bridge-Crete, or EBC) and Fiber-Reinforced Super-Workable Concrete (FR-SWC). The project seeks to optimize the coupled effect of fiber characteristics, expansive agent (EA), saturated lightweight sand (LWS), and external moist curing on mechanical properties, shrinkage, and corrosion resistance of such classes of high-performance concrete. The project also aims to replace steel reinforcement in flexural members with steel fibers partially. In Task I, Eco-Bridge-Crete mixture design was optimized to reduce drying and restrained expansion and secure high mechanical properties. Eco-Bridge-Crete mixtures were optimized using various shrinkage mitigating strategies, including the use of different contents of CaO-based EA, LWS, and steel fibers as well as different moist curing conditions. The study revealed some synergistic effects among the EA, LWS, and fiber contents and external curing that led to lower shrinkage and restrained expansion and greater strength. The combined use of EA, along with LWS, was shown to reduce concrete conductivity and improve corrosion resistance. Overall, the use of synthetic fibers, EA along with LWS, increased moist curing duration, and concrete cover depth was identified as suitable strategies for improving the corrosion resistance of Eco-Bridge-Crete mixtures. In Task II, the structural performance of reinforced concrete beams cast with FR-SWC mixtures made with different fiber types and reinforcing steel densities was evaluated. The testing involved casting of beam elements with different steel reinforcement densities (0.4 to 0.8 in.\ub2 of steel area in the tension zone).104
This paper experimentally examines the influence of abrasive water jet (AWJ) machined holes on th... more This paper experimentally examines the influence of abrasive water jet (AWJ) machined holes on the mechanical performance and damage evolution of flax/epoxy and carbon/flax/epoxy hybrid composites....
Journal of Materials in Civil Engineering, Jul 1, 2017
AbstractNonuniform distribution of fibers in steel fiber-reinforced cement-based materials can le... more AbstractNonuniform distribution of fibers in steel fiber-reinforced cement-based materials can lead to heterogeneous hardened properties directly impacting mechanical properties. Given the highly c...
U.S. Transportation Collection2020PDFTech ReportKhayat, Kamal H.Research on Concrete Applications... more U.S. Transportation Collection2020PDFTech ReportKhayat, Kamal H.Research on Concrete Applications for Sustainable Transportation (RE-CAST)Missouri University of Science and TechnologyUnited States. Department of Transportation. Office of the Assistant Secretary for Research and TechnologyUnited States. Department of Transportation. University Transportation Centers (UTC) ProgramResearch on Concrete Applications for Sustainable Transportation (RE-CAST)United StatesAdmixturesCorrosion resistanceFiber reinforced concreteFlexural strengthReinforcing barsRheological propertiesSynthetic fibersTensile strengthAdapted RheologyRECAST UTC # 00064859DTRT13-G-UTC45Final Report, Period: 09/01/18 \u2013 12/31/19The main objectives of this project can be summarized as follows: 1. Optimize the SRA-fiber system of SCC and SWC mixtures to achieve superior performance, including properties, autogenous shrinkage, restrained shrinkage, mechanical properties (tensile and compressive strength), frost durability, and transport properties. The investigation will include the Eclipse 4500 SRA, or equivalent, and two types of synthetic fibers (i.e., STRUX and SINTA from GCP). 2. Evaluate the effect of rheological properties of fiber alignment along the casting-flow direction of structural elements. The rheological properties of concrete will be modified using a viscosity modified admixture (VMA), such as V-MAR from GCP. The incorporation of VMA can improve the stability of the concrete mixture and distribution of the fibers. 3. Investigate the corrosion resistance of reinforcing bars in pre-cracked FR-SCC and FR-SWC mixtures. The cracking will be controlled to achieve different widths for mixtures with different fibers. The transport properties of the concrete matrix will also be investigated. 4. Evaluate the enhancement in tensile/flexural toughness and shrinkage/crack resistance of FRC made with partially replacement of the steel reinforcement in flexural members with different types of and combinations of the STRUX and SINTA fibers.105
2020PDFTech ReportKhayat, Kamal H.Missouri University of Science and Technology. Center for Trans... more 2020PDFTech ReportKhayat, Kamal H.Missouri University of Science and Technology. Center for Transportation Infrastructure and SafetyMissouri. Department of Transportation. Construction and Materials DivisionMissouri. Department of Transportation. Construction and Materials DivisionUnited StatesAdmixturesBridge constructionCorrosion resistanceCrackingDurabilityFiber reinforced concreteFlexural strengthPerformance based specificationsShrinkageSteel fibersStructural analysisBridgeEco-Bridge-CreteExpansive admixtureFlexural strengthSteel reinforcementStructural performancecmr 20-006MoDOT project # TR201806Final Report (December 1, 2017-May 1, 2020)The main objective of this research is to propose novel materials for the construction and retrofitting of bridges, including Economical Crack-Free High-Performance Concrete (Eco-Bridge-Crete, or EBC) and Fiber-Reinforced Super-Workable Concrete (FR-SWC). The project seeks to optimize the coupled effect of fiber characteristics, expansive agent (EA), saturated lightweight sand (LWS), and external moist curing on mechanical properties, shrinkage, and corrosion resistance of such classes of high-performance concrete. The project also aims to replace steel reinforcement in flexural members with steel fibers partially. In Task I, Eco-Bridge-Crete mixture design was optimized to reduce drying and restrained expansion and secure high mechanical properties. Eco-Bridge-Crete mixtures were optimized using various shrinkage mitigating strategies, including the use of different contents of CaO-based EA, LWS, and steel fibers as well as different moist curing conditions. The study revealed some synergistic effects among the EA, LWS, and fiber contents and external curing that led to lower shrinkage and restrained expansion and greater strength. The combined use of EA, along with LWS, was shown to reduce concrete conductivity and improve corrosion resistance. Overall, the use of synthetic fibers, EA along with LWS, increased moist curing duration, and concrete cover depth was identified as suitable strategies for improving the corrosion resistance of Eco-Bridge-Crete mixtures. In Task II, the structural performance of reinforced concrete beams cast with FR-SWC mixtures made with different fiber types and reinforcing steel densities was evaluated. The testing involved casting of beam elements with different steel reinforcement densities (0.4 to 0.8 in.\ub2 of steel area in the tension zone).104
This paper experimentally examines the influence of abrasive water jet (AWJ) machined holes on th... more This paper experimentally examines the influence of abrasive water jet (AWJ) machined holes on the mechanical performance and damage evolution of flax/epoxy and carbon/flax/epoxy hybrid composites....
Journal of Materials in Civil Engineering, Jul 1, 2017
AbstractNonuniform distribution of fibers in steel fiber-reinforced cement-based materials can le... more AbstractNonuniform distribution of fibers in steel fiber-reinforced cement-based materials can lead to heterogeneous hardened properties directly impacting mechanical properties. Given the highly c...
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