Prestressed pipe grouting agent/material impact on the service life of the bridge

Prestressed pipe is also called the bellows, the grouting compactness is good or bad has a important influence on the durability of the bridge, according to statistics, due to grouting imperfect prestressed pipe steel wire corrosion, prestress loss in advance, can cause bridge actual life reduced to one over ten of the design life. Grouting materials and grouting prestressed pipe grouting agent construction is the main factors affecting grouting chamber of sex is good or bad. Below for everyone to introduce the performance of the duct grouting agent, and if the grouting construction. Preferred to introduce the performance characteristics of prestressed pipe grouting agent/material: 1. Liquidity is good, the initial velocity is less than 17 s, no shrinkage, self-compacting, high strength, no bleeding, not hierarchical. 2. Good durability, no JiGuan slurry system, there is no aging, for reinforcement corrosion and durability. 3. Grouting with full early strength, micro expansion and other characteristics. 4. Products with high filling, can one-time grouting construction, no pore density of slurry in pipe. 5. Prestressed steel does not rust, strong and concrete binding rust, rust resistance, low alkali no chlorine, bonding degree is high, the green environmental protection. 6. Easy to use, pipe grouting agent with 8 ~ 12% mixed with cement mixed with common micro expansion grouting material can be used. Recommended dosage is 10%. Prestressed pipe pressure slurry can be directly add water use. Second, the prestressed pipe grouting agent/material method of use: 1, the production of prestressed reinforcement, anchorage, fixture, such as installation, exert prestress, and should meet the design requirements such as grouting, in line with the passenger dedicated line precast prestressed concrete beam and the provisions of the interim technical conditions. 2. Prestressed pipe grouting agent mixing the slurry water cement ratio of reference, advice 0. 26 - 0. 28, actual water-cement ratio should be according to the test. In a blender into actual batch - 80% of the water 90%, start the mixer, even add all pipe grouting agent, and to join the stirring, then add all cement. All powder stir in slow 2 min, and then quickly stir 1 min, add the remaining 10% 20% of the mixing water, stir for 1 min. 3. Slurry mixing to pressure into the channel of the duration, depending on the temperature conditions, generally in the 30 - Within 45 min. 4. Pulp before use and injection process should be continuous stirred. Three, prestressed pipe grouting agent/material construction note 1. Grouting slurry temperature should be kept at 5 ℃ - Between 30 ℃, otherwise measures should be taken to meet the conditions. 2. Prestressed pipe grouting agent, water weighing accuracy, and strictly according to determine the water cement ratio and water, water added shall not be adjusted freely. Caulking agent manufacturers building materials warn broad customer, buying prestressed pipe grouting agent to select normal manufacturer, because the regular manufacturer from selected material selection to production sales, cengcengbaguan, strictly control the quality. Second, the normal manufacturer has specialized technical personnel, can at any time to our customers to guide the construction.