命题考点三 混凝土的技巧性能和质量请求(国外英文资料).doc

命题考点三 混凝土的技术性能和质量要求(国外英文资料) 1a410,000 construction engineering technology 1a412,000 construction engineering village materials 1 a412,000 architectural engineering materials section test online evaluation The technical performance and quality requirements of the three-concrete test If you have any questions in the course of your study, please visit the member center and ask me to communicate with the students at any time. [textbook reading] The harmony between concrete and concrete Workability of concrete mixing content refers to the concrete mixing content easy to operation, mixing, transportation, pouring and tamping), and the performance of uniform quality, forming dense, also called the workability. It is a comprehensive technical property, including liquidity, cohesiveness and water retention. The main factors influencing the mixing and making of concrete are the amount of water, sand rate, the properties, time and temperature of the materials. The strength of the concrete Concrete cube compressive strength According to the national standard standard of ordinary concrete mechanics performance test method (GB/T50081-2002), making side length is 150 mm cube specimens, in the standard conditions (temperature 202 ℃, relative humidity above 95%), the maintenance to 28 d age, measured value of the compressive strength of concrete cube compressive strength of the specimens, expressed in fcu, units for the MPa. Standard strength and strength of concrete cube The concrete strength level is divided according to the strength of the concrete cube, and the standard value (unit for MPa) of the standard C and cube is adopted. Ordinary concrete is divided into Cl5, C20, C25, C30, C35, C40, C45, C45, C55, C55, C65, C75, C75, C75, C75, C75, C75 and C80 have 14 levels, C30 is the standard value of the concrete cube, 30MPa is less than the standard value of 30MPa, and k 35MPa. The strength grade of concrete is the important basis for the design of concrete structure, constructio