Tangshan, Linfen grouting material - grouting material tensile strength testing 
 Although generally not the grouting material designed to directly affected by the tension member and help us to estimate the size of the loads when the crack development, but until the tensile strength. In order to maintain the continuity of the grouting material structure and to prevent the case of corrosion of steel bars, to avoid the grouting material, the Tangshan grouting material cracking important. When the shear stress caused by Diagonal Tension, often cracking problem, but the most common case of cracking be bound by the contraction and there exists a temperature gradient. Determine the tensile strength of the grouting material to help us understand the characteristics of reinforced grouting material, even if it is not considered in the tensile strength in many cases, the actual design calculations. 
 Grouting materials for prime, Tangshan, Linfen grouting material structure, tensile strength is also very important, for example, dams in the earthquake. Some other structure, such as highways and airport runways, are based on the flexural strength design, including the tensile strength. 
 There are three types of tensile strength test method: direct tensile test, flexural test and the splitting tensile test. 
 Difficult to put pure tension without eccentricity. Although the idler clamp with some success, however difficult than avoiding secondary stress caused by the fixture, or embedded studs. U.S. Bureau of Reclamation has given a direct tensile test method, which bound the end plate. Tensile strength of the other two test methods are described below. 
 Flexural strength test 
 In these trials, the prime grouting material, the Tangshan grouting material beam symmetric load is applied until the destruction. Point load is applied at 1/3 of the beam span, the test method, also known as three-point loading method. Is the modulus of rupture in the theoretical maximum tensile stress appears at the bottom of the grouting material beam. 
 Beam test surface and pouring surface is usually there are some relations, but as long as the grouting material, Tangshan, Linfen grouting material, not segregation, the relationship between the beam test surface and pouring surface does not affect the modulus of rupture of the specimen. 
 British Standard BS1881-118; 1983 regulations imposed by the three branches of loading 150mm * 150mm * 750mm beam (span of 450mm), but you can also use the 100mm * 100mm of the trabecular meshwork, as long as the trabecular side length of at least aggregate The maximum diameter of 3 times. 
 The ASTM C78-94 the provisions of BS1881-118; 1983 similar. If the fracture is within the range of 1/3 of the beam central, according to the ordinary theory of elasticity, modulus of rupture is equal to the PL / (bdp2). 
 P-beam where the maximum total load 
 L-span 
 b-beam width 
 d-beam high 
 If the fracture is outside the loading point, such as distance from the near the fulcrum aa is the average distance measured beam tension surface, but shall not exceed the span of five percent, so the modulus of rupture is calculated in accordance with 3Pa / (bdp2) This means that the calculations take into account the maximum tensile stress is a critical interface, while the maximum stress is not a beam, should not consider v exceeded outside the the trabecular central 1/3 of the destruction. 
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