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Ignorance towards the tensile strength of concrete may lead to the problems of serviceability and durability and it makes tensile strength an important parameter of design.Ĭurrently, there are three common methods for measuring the tensile performance of the concrete, namely, the direct tension test, the splitting tensile test, and the flexural test. For example, the propagation and control of cracks are highly related to the tensile strength of concrete. However, the tensile strength of concrete still has significance in terms of durability and serviceability. In the design of reinforced concrete members, the tensile strength of the concrete is generally ignored. Tensile strength is an important mechanical property of concrete, although its value accounts only for 7–15% of its compressive strength. It shows that this innovative test method, which is precise and easy to conduct, can be an effective alternative for tensile strength of concrete. The test results show that the concrete tensile strength obtained by this proposed method is close to the value obtained from the direct tension test for concrete with compressive strengths from 25 to 55 MPa.
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By applying the strut-and-tie concept and modifying the experimental design of the ASTM C78, a new concrete tensile strength test method is proposed. The objective of this research is to develop a new concrete tensile strength test method that is easy to conduct and the result is close to the direct tension strength.
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The three widely used test methods for measuring the tensile strength of concrete each have their shortcomings: the direct tension test equipment is not easy to set up, particularly for alignment, and there are no standard test specifications the tensile strengths obtained from the test method of splitting tensile strength (American Society for Testing and Materials, ASTM C496) and that of flexural strength of concrete (ASTM C78) are significantly different from the actual tensile strength owing to mechanisms of methodologies and test setup. All concrete slabs should be tested for moisture regardless of age or grade level while all concrete floors should be tested for pH before installing resilient flooring.Tensile strength is one of the important mechanical properties of concrete, but it is difficult to measure accurately due to the brittle nature of concrete in tension. The surface of the floor should be cleaned by scraping, brushing, vacuuming, or any other method. Surface cracks, grooves, depression, control joints or other non-moving joints, and other irregularities should be filled or smoothed with latex patching or a recommended underlayment compound.
ASTM STANDARDS FOR CONCRETE TESTING FREE
Concrete floors for resilient floorings should be permanently dry, clean, smooth, structurally sound, and free of substances that may prevent adhesive bonding. A permanent, effective moisture vapor retarder, of the specified thickness and permeance, is required under all on- or below-grade concrete floors. It also includes suggestions for ensuring that the constructed concrete floor is acceptable for such installations but does not cover tests for adequacy of the concrete floor to perform structural requirements. This practice covers the procedure for determining the acceptability of concrete floors for the installation of resilient flooring.