Changes in portlandite morphology with solvent composition: Atomistic simulations and experiment

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Properties Of Concrete

A review on ultra high performance concrete: Part I. Raw materials and mixture design

Heat island phenomenon rises the temperature of cities, increases the energy demand for cooling and deteriorates comfort conditions in the urban environment. To counterbalance the impact of the phenomenon, important mitigation techniques have been proposed and developed. Pavements present a very high fraction of the urban areas and contribute highly to the development of heat island in cities. The use of cool pavements presenting substantially lower surface temperature and reduced sensible heat flux to the atmosphere, appears to be one of the most important proposed mitigation solutions. The present paper investigates and describes the actual state of the art on the field of cool pavements. The main thermal and optical parameters defining the thermal performance of pavements are analyzed. Almost all of the developed technologies, where data and results are available, are considered while emphasis is given on the presentation of reflective and permeable/water retentive pavements. The main technological achievements on both fields are reviewed while existing applications are described and performance data are given when available. The existing results clearly show that the mitigation and cooling potential of cool pavements is very significant and can highly contribute to decrease temperature on the urban environment.

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Using cool pavements as a mitigation strategy to fight urban heat island—A review of the actual developments

Rheological requirements for printable concretes

In this paper, the variation of the fiber orientation distribution along the flow of fresh UHPCC was studied. In order to describe the rotational motion of a single fiber, Jeffery’s equation was adopted, in which the interaction among fibers is neglected. Two cases of flow patterns were considered: shear flow and radial flow. Starting with a three-dimensional random distribution of fibers, the fiber orientation distribution along the flow distance was simulated. These results reveal that fibers gradually become more parallel (in the case of shear flow) and perpendicular (in the case of radial flow) to the flow direction as the flow distance increases. This approach will be useful to predict flow-dependent tensile behavior considering the change of fiber orientation distribution.

Numerical simulation of the variation of fiber orientation distribution during flow molding of Ultra High Performance Cementitious Composites (UHPCC)

Numerical analysis of localized steel corrosion in concrete

Application of a thermal stress device for the prediction of stresses due to hydration heat in mass concrete structure

Effect of strength and age on the stress–strain curves of concrete specimens

where α0 is the coefficient related to the location of the plastic hinge of beams (=1.0 to 1.25); αf is the coeffi- cient related to the direction of the beam reinforcing bars; (=0.85 to 1.0); αd is the coefficient related to the ductility of the plastic hinge of beams (=1.0 to 1.2); γ is the coeffi- cient related to inter-story drift when the yield strength of beam reinforcing bars is greater than 300 MPa (43.5 ksi) (γ = 1.53 - 0.29 δc ≤ 1.0); and δc is the inter-story drift ratio expressed as a percentage.

Jin-Keun Kim

Papers

Numerical simulation of the variation of fiber orientation distribution during flow molding of Ultra High Performance Cementitious Composites (UHPCC)

Numerical analysis of localized steel corrosion in concrete

Application of a thermal stress device for the prediction of stresses due to hydration heat in mass concrete structure

Effect of strength and age on the stress–strain curves of concrete specimens

Cyclic Loading Test for Beam-Column Connections with 600 MPa (87 ksi) Beam Flexural Reinforcing Bars