Testing conditions including age, rate of loading, method of testing, and specimen geometry significantly influence the measured strength.
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These, in turn, depend on the macro- and microscopic structural features including total porosity, pore size and shape, pore distribution and morphology of the hydration products, plus the bond between individual solid components. The properties of the constituent materials which affect the strength are the quality of fine and coarse aggregate, the cement paste and the paste-aggregate bond characteristics (properties of the interfacial, or transition, zone). The strength of concrete depends on a number of factors including the properties and proportions of the constituent materials, degree of hydration, rate of loading, method of testing and specimen geometry. Thus the relationships of mechanical properties to 28-day compressive strength of high strength concrete cannot be expected necessarily to apply to VES and HES concretes. This will lead to relative differences in elastic modulus and tensile strength of early strength concretes and high strength concretes, expressed as a function of compressive strength. Typically, strength gain in compression is much faster than strength gain in aggregate-paste bond. Since high performance concretes typically have low water-cementitious materials ratios (W/CM) and high paste contents, their characteristics will, in many cases, be similar to those of high strength concrete.Ī significant difference in behavior between the early strength and the high strength concretes is in the relationship of compressive strength to other mechanical properties. The long-term properties include creep, shrinkage, behavior under fatigue, and durability characteristics such as porosity, permeability, freeze-thaw resistance, and abrasion resistance.Ĭomparatively speaking, information on the behavior of very early strength (VES) concrete and high early strength (HES) concrete is somewhat limited, whereas a substantial amount of information on the behavior of high strength concrete exists and additional information is being developed rapidly. Short-term properties include strength in compression, tension, bond, and modulus of elasticity. The behavior of hardened concrete can be characterized in terms of its short-term (essentially instantaneous) and long-term properties. Author Elsebeth Aasted Schan z, PhD, Manager and curator of the Danish Poster Museum.High-Performance Concretes A State-of-Art Report (1989-1994)
From the book “We are all equal”, by Finn Nygaard. Tag team wrestling is especially prevalent in lucha libre, particularly matches with three-member teams, called trios. The wearing of masks has developed special significance, and matches are sometimes contested in which the loser must permanently remove his mask, which is a wager with a high degree of weight attached. Mexican wrestling is characterized by colorful masks, rapid sequences of holds and maneuvers, as well as “high-flying” maneuvers, some of which have been adopted in the United States.
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Lucha libre meaning “free fighting” is a term used in Mexico, and other Spanish-speaking countries, for a form of professional wrestling that has developed within those countries. Although the term nowadays refers exclusively to professional wrestling, it was originally used in the same style as the English term “freestyle wrestling”, referring to an amateur wrestling style without the restrictions of Greco-Roman wrestling.
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