Building technology co. , LTD production of prestressed pipe pressure slurry iron standard rules

Prestressed pipe pressure slurry prestressed pipe pressure prestressed pipe pressure slurry paste manufacturer price general qualitative check prestressed pipe pressure slurry, square more packages should be under the demand for the partition of the hard and close specifications chapter 7 of this chapter apply to climb powder source raw materials choice makes concrete construction system, transportation, pouring, curing and the requirements of the chapter. Coagulation, etc. Used in all kinds of prestressed pipe pressure slurry, shall comply with the provisions of the national or industry standards, and should be comes into play for its performance and quality inspection in into and quality testing, the compressive strength of concrete should be standard length is 150 mm cube foot specimens should take its insurance rate is. Should be in 3 for the same period, each group of compressive strength of the specimens with three specimens measured value calculate value ( Calculate accurately to 0 mpa) For the determination of one measurements and the intermediate value of the difference over 15% of the median, take the middle value of test values; When there are two measurements and the intermediate value of the difference is more than 15% when the group specimen is invalid. Coagulation bed strength should be in the way of forming of the specimen, in standard conditions (zheng Temperature 20 ℃, 2 ℃, relative humidity of not less than 5%) Curing 28 d compressive strength value (measured by MPa） To assess. Using steam curing of concrete compressive strength of specimen should be along with the component with the steam curing condition, again under the condition of quasi maintenance, total curing time shall be the 28 d. When the concrete with fly ash and other mineral admixtures, determining the compressive strength of concrete age should conform to the requirement of design. Highway bridge coagulation and appropriate use of active aggregate, when conditions don't have to use other material in the alkali content and the biggest total alkali content in concrete shall comply with the provisions of this specification.