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. Wikipedia.High-Performance Concretes A State-of-Art Report (1989-1994) Non-musical ventures include Dollywood, a theme park in Pigeon Forge in the Smoky Mountains of Tennessee, and her efforts on behalf of childhood literacy, particularly her Imagination Library, as well as Dolly Parton’s Dixie Stampede and Pirates Voyage. In the late 1990s, she returned to classic country/ bluegrass with a series of acclaimed recordings. A pair of albums recorded with Linda Ronstadt and Emmylou Harris were among her later successes. A string of pop-country hits followed into the mid-1980s, the most successful being her 1981 hit “ 9 to 5” (from the film of the same name) and her 1983 duet with Kenny Rogers “ Islands in the Stream“, both of which topped the U.S. Moving towards mainstream pop music, her 1977 single “Here You Come Again” was a success on both the country and pop charts. She rose to prominence in 1967 as a featured performer on singer Porter Wagoner‘s weekly syndicated TV program their first duet single, a cover of Tom Paxton‘s “ The Last Thing on My Mind“, was a top-ten hit on the country singles chart and led to several successful albums before they ended their partnership in 1974. Relocating to Nashville at age 18 in 1964, her first commercial successes were as a songwriter (her songs during this period were covered by numerous artists,including Bill Phillips and Kitty Wells). Her career began as a child performer on the radio, then recording a few singles from the age of 13. Dolly Rebecca Parton (born Janu) is an American singer-songwriter, instrumentalist, actress, author, and philanthropist, known primarily for her work in country music.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |