欧美图亚洲色另类偷偷自拍

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    concrete pump plugging causes and preventive measures
    Causes and preventive measures: (Q&A)
    1.Cement
    Q:using slag Portland cement, large water secretion, concrete segregation
    A:(1).mix with fly ash or increase cement amount, to reduce the water cement ratio
    (2).improve sand ratio
    (3).Add air entraining / low water reducing agent
    Q:the amount of cement is too small
    A:increase the amount of cement
     
    2.aggregate particle
    Q:coarse aggregate particle size is more than 1/3 of the pipe diameter.
    A:maximum particle size is less than 1/3 of delivery pipe
    Q:sand rate is too low
    A:increase the percentage of sand
    Q:sand, stone grading is bad
    A:adjustment ratio of sandstone
     
    3.Operation
    Q:concrete supply disruptions
    A:(1).Prepare for material supply plan according to pouring area
    (2).the operator to observe the hopper deposit material, non-pump empty
     
    4.pipe
    Q:pipe joints leaking cement slurry
    A:(1).the water pressure test after installation 
    (2).sufficient spare parts for replacement
    createtime 2013-01-13 author webmaster view count
    欧美图亚洲色另类偷偷自拍
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