Brand of prestressing duct pressure slurry actual usage how to calculate

Prestressed pipe pressure prestressed pipe pressure slurry pulp price prestressed pipe dosage of prestressed pipe pressure slurry paste manufacturer practice = prestressed duct clearance volume ( Corrugated pipe cross section area of less steel hinge line section area x pipeline) ×0. 8 prestressed slurry pipeline pressure should be satisfied with the following requirements: just beam tension, after the completion of appropriate pipe grouting in two days. Prestressed pipe pressure slurry should be consistent with the railway after tensioning prestressed concrete beam pipe grouting technology conditions '( 结核病/ T3192 - 2008). 。 Before the grouting pipe should be removing debris and water. Pressure should be the full dense cement slurry into the pipe. In order to ensure the durability of beam body, high performance without a shortened anti-corrosion grouting technology target should be satisfied with the following requirements: ( 1) Greater than 55 mpa compressive strength, flexural strength is greater than 10 mpa; （ 2) Condensation moment: initial setting is more than 4 hours, final set less than 24 hours; （ 3) Let stand condition exudation rate: 3 hours less than 0. 1%, 24 hours for 0; Mao Bi water rate: 3 hours less than 0. 1%; ( 4) Pressure exudation goal: 0. 14 mpa, the biggest exudation rate not greater than 6%; ( 5) Fluidity, fluidity of machine 21 + 4 seconds, fluidity of 30 minutes 30 seconds; ( 6) Inflation rate 0 ~ 0 28 days constraints. %; ( 7) Filling degree: no visible to the naked eye water sac, no diameter greater than 3 ㎜ airbag; ( 8) Contain organic saturated mobility rust resistance seam an agent ( Rigorous use of nitrite or chromate and other ingredients of rust resistance seam an agent) 。 3. Prestressed pipe grouting should be chosen for vacuum grouting process; Grouting machine should choose continuous; The same grouting should be continuous, at one time. 4. When choosing the vacuum grouting, grouting pipe in - vacuum stability 0. 06 ~ - 0. Between 10 mpa. After slurry filling of pipeline, should be 0. 5 to 0. 6 mpa pressure the pressure 2 min. 5. The slurry mixing time interval to pressure into the pipe end not surpass 40 min. 6. At the end of the beam of prestressed tensioning, floor system before construction should be at the top of the beam body adopt hulls coverage measures, such as to prevent direct sunlight beam body. 7. The girder concrete pouring and prestressed pipe grouting should prevent the winter construction, otherwise it is necessary to adopt reliable heat preservation measures such as steam keep fit to ensure construction quality.