抗折强度与抗压强度的换算关系（Conversion relationship between folding strength and compressive strength）.docVIP

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抗折强度与抗压强度的换算关系（Conversion relationship between folding strength and compressive strength）.doc

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抗折强度与抗压强度的换算关系（Conversion relationship between folding strength and compressive strength）

抗折强度与抗压强度的换算关系（Conversion relationship between folding strength and compressive strength） Technical properties of ordinary concrete (middle part) Chinese concrete network [2006-1-18] network hard disk I want to build station blog to search frequently The performance of hardened concrete Strength of concrete Strength is the most important properties of hardened concrete, and the other properties of concrete and strength all have close relations, the strength of the concrete mixture ratio design, construction control and main technical indexes for evaluation of the quality inspection. The strength of concrete is mainly compressive strength, folding strength, tensile strength and shear strength. The compressive strength value is the largest and the most important strength index. 1. Concrete cube compressive strength and strength grade. According to the test methods of normal concrete mechanical properties (gbj81-85), the standard size of the cube specimen is 150mm x 150mm x 150mm. Standard curing conditions for 20 + / - 3 ℃ temperature, relative humidity above 90%; The standard age is 28 days. The compressive strength measured under the above conditions is called concrete cube compressive strength. The test and calculation methods are shown in the test section. According to specification for design of concrete structures (GB50010-2002), the strength grade of concrete is determined according to the cube compressive strength standard values, and the concrete cube compressive strength standard value refers to the standard method to make maintenance of side length is 150 mm cube specimens, 28 days in age with standard method of compressive strength with 95% reliability. The concrete structures are divided into C15, C20, C25, C30, C35, C40, C45, C45, C55, C55, C65, C75, C75, C75, C75, C80, C75, C75, C80, C75, C75, C80, C75, C75, C80, C75, C75, C80, C75, C75, C80, C75, C75, C80, C75, C75, C80 According to the concrete quality control standards (GB50164-1992) regulation, stre