دانلود رایگان مقاله لاتین مفاصل ساخت و ساز از سایت الزویر
عنوان فارسی مقاله:
اثر مفاصل ساخت و ساز در استحکام کششی بتن
عنوان انگلیسی مقاله:
Effect of construction joints on the splitting tensile strength of concrete
سال انتشار : 2015
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مقدمه انگلیسی مقاله:
1. Introduction
There are two traditional tests methods to measure the tensile strength of concrete, the splitting tensile strength of concrete cylinders and the flexural strength of beams. The splitting known as the Brazilian or the indirect tension test is a popular method of characterizing the tensile strength of concrete. This is mainly due to the fact that the cylinder is a commonly and routinely fabricated specimen. Moreover, the testing procedure is quite simple, and has been specified in several recommendations and standards (e.g., ASTM C496 (ASTM Standard C496, 2002) and RILEM CPC6 (RILEM, 1994)). The splitting tensile strength test (Fig. 1) consists of applying a diametric compressive load along the entire length until failure occurs. This loading induces tensile stresses on the plane containing the applied load and compressive stresses in thearea around the applied load. To avoid local compressive strength, plywood strips are used between the specimen and the plate. Tensile failure occurs instead of compressive failure since the areas under the load application are in a triaxial compression state, therefore allowing them to resist higher compressive stresses than what would have been indicated by a uniaxial compressive strength (ASTM Standard C496, 2002). Both tensile strength and compressive strength of concrete are important factors that affect the cylinder’s ability to resist failure. The ASTM designation C496 describes the test method for splitting tensile strength of concrete, and details the procedure for obtaining the results by breaking cylinders measuring 300 mm by 150 mm. These mentioned standards require the cylinder to be monolithic. It should be noted that the strength obtained from the splitting test depends on the diameter of the specimen (Bazant et al., 1991; Tang et al., 1992). However, the use of a standard diameter, such as 150 mm, circumvents this problem, as in compression tests. The resulting strength is not necessarily a material property but nevertheless, a reliable value that can be used for comparison and design.
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کلمات کلیدی:
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