Prestressed pipe pressure slurry how to operate the construction

Prestressed pipe pressure slurry prestressed pipe pressure slurry highway and railway construction of prestressed pipe pressure slurry points two kinds of different specifications of the products, just as its name implies railway prestressed pipe pressure slurry is mainly used in the construction of railway Bridges, and highway prestressed pipe pressure slurry is used for the construction of highway Bridges and roads to settle matters later prestressed pipe. AGM - YL to settle matters later prestressed pipe pressure slurry product features: good liquidity: a machine paste fluidity to 10 to 17 seconds, 30 min after the fluidity is not more than 20 seconds, fluidity is not more than 25 seconds for 60 min; No exudation: 3 h capillary bleeding rate and 24 h free exudation rate to zero; Expansion performance: quantity is appropriate, day 0 ~ 2% inflation, both make up the shrinkage, also prevent excessive expansion led to the decrease of the density; Expansion time is appropriate, mainly produced within 1 ~ 6 h after adding water mixing, is advantageous to the filling construction; High strength, high early strength and post strength, compressive strength of the 7 d above 40 mpa, 28 d compressive strength more than 60 mpa; Permeability performance: the hardened paste has excellent resistance to chloride ion permeability; 28 d dentsu power (1500 c or less With reference to ASTMC1202 - 97). 。 So in the process of construction of prestressed pipe pressure slurry to note those problems? A, the construction process, the products meet the national standard ( GB / T50448 - 2008). Requirements, is superior to the transportation industry standard 'technical specification for construction of highway bridge JTG/TF50 - 2011, completes the construction preparation; Second, the construction, will join the recommended water pressure slurry mixing evenly apply, consult JTG/TF50 - 2011 standard requirements of construction technology for site construction; Three, recommend to water-binder ratio: 0. 27 ( Adjust according to actual test) ； Four, 25 kg/bag, 50 kg/bag, dry environment unopened product storage period of 6 months; Five, storage products, more than six months before use should be tested to determine whether performance indicators meet the requirements.