What are features of concrete girder with post-tensioning method?

Concrete girder is usually used for bridge construction, lifted and installed by launching girder. Quality of concrete girder decides the quality of a bridge, here we simply introduce features of concrete girder with post-tensioning method.

concrete girder

1. Good fluidity: fluidity of new-out cement slurry 18±4s, fluidity < 30s 30 minutes later;
2. Good stability: without stratification and sediment, the cement paste forms stable and integrated fluid;
3. No shrinkage performance: the cement paste features no shrinkage performance or micro-dilatancy which have good cohesive force with pre-stressed channel;
4. High filling degree: the cement slurry could fill the whole channel with good filling degree;
5. High strength: features very high early strength and long-term strength, breaking strength and compressive strength included. It can reach 70% of design strength or above in 7 days;
6. Antiseptic property: have antiseptic property to pre-stressed strands;
7. Durability: hardened cement paste possesses excellent freezing-thawing resistance performance and chloride penetration resistance performance;
8. Convenient construction: it is available for construction in any season, featuring good workability.