Prestressed pipe pressure slurry circuit material requirements

Prestressed pipe pressure slurry prestressed pipe pressure slurry circuit prestressed pipe pressure slurry material manufacturer in the concrete mixed with prestressed pipe pressure slurry and the seam an agent, in addition to 6 should conform to this specification. The prescribed in section 6, it shall meet the following requirements: 1, in the reinforced concrete and prestressed concrete shall be mixed with calcium chloride, sodium chloride and chloride salt. 2 when chlorine ion introduced from all kinds of material ( Chlorine or salt content) Greater than the table 6. 8. 3 rules limit, rust resistance should be taken in the concrete mixed with beautiful seam an agent, increasing the thickness of protection layer, and improve the compactness of corrosion protection measures. 3 of concrete mixed with air-entraining beautiful seam an agent, the air content appropriate for 3. 5% ~ 5. 5%. In addition to dealing with prestressed pipe pressure slurry composed of various materials into the alkali content of concrete control outside, still should control the total alkali content of concrete. Per cubic meter of concrete aggregate content, the general bridge should not be greater than 3. 0 kg/m2, to the super-large bridge, the bridge and the important bridge should not be greater than 1. 8kg/m; When concrete structure under severe erosion environment, must not use aggregate with active alkali-aggregate reaction. Pumping concrete mixture ratio should meet the following requirements: 1, the appropriate minimum cement dosage is 280 ~ 300 kg/m ( Conveying pipe diameter of 100 ~ 150 m) 。 Through 0. 3 mm mesh of sand should not be less than 15%, sand ratio should be controlled in the range of 35% ~ 45%. 2 the machine slump of concrete mixing content appropriate for 100 ~ 200 mm, pump into the mold of the slump should be controlled between 80 ~ 180 mm. 3 appropriate experimental mixed with just the right amount of water reducing beautiful seam an agent, pumping beautiful seam an agent and admixture.