| City municipal drainage pipe is very important for the development of modern city infrastructure. Its main function is to collect the domestic domestic sewage, industrial waste water and rainwater and timely transport them out to ensure the normal operation of daily life and industry. Currently widely used in municipal engineering is concrete pipes, and plastic pipes. The pipelines exist the following problems:(1)The strength of pipe is insufficient, and often occurs the phenomenon of pipe rupture;(2)Due to the poor durability of pipeline, the pipeline easy to occur many problems of aging and corrosion damage;(3) Ordinary concrete canal wall is too rough. It often leads to cause pipeline sitation and is not conducive to the discharge of sewage.Ultra High Performance Concrete is a new kind of concrete having excellent mechanical properties and superior durability. It has a very good performance in the application of railway bridges and other projects in the cover, but less used in municipal pipeline.To solve the above problem, this paper carried out the preparation and properties of ultra-high performance concrete drainage channels, the first ultra-high performance concrete system of the stirring, conservation and Mix system has been optimized, then use Pumping process for preparing an ultra High-performance concrete pipes, external pressure load and durability and pipelines were studied.The main work and results of this paper are summarized as following:(1) The effect of stirring system for ultra-high performance and mechanical properties of concrete work is studied. Stirring system mainly influences the working performance of the ultra-high performance concrete. Steel Fiber start adding while stirring, to ensure its uniform distribution in the concrete; additional appropriate extension of the mixing time after the water reducing agent is added to further improve the flow of concrete.(2)The influence of time distribution of curing systems on concrete strength is studied. The results showed that the orm removal strength of the concrete is in direct proportion to the initial curing temperature, while the ultimate strength of the concrete is less affected. And curing system with total time consumption of 3d is optimized.(3)Systemically studied several different mineral admixtures and combinations, fiber type and content, and studied their influence on the performance of workability and mechanical properties of ultra-high performance concrete. Finally, we selected a mix of ultrahigh performance concrete, which can get the strength of 150 MPa and the fluidity of 200 mm. Its plastic material composed of 58% concrete +12% admixtures A + 10% admixtures B + 20% admixtures C, and selected steel fiber, its volume content is 1.4%.(4)The method of making ultra-high performance concrete pipe is studied. The results showed that the plastic pipe within the mold, can be prepared using Pumping out the wall smooth, no shrinkage cracks in ultra-high performance concrete pipes.(5) The effects of different steel fiber content and the amount of reinforcement ring bars on Ultra High Performance Concrete Pipe external pressure load performance is studied. The results show that the pipe, made by Ultra High Performance Concrete, can meet the requirements of plain concrete pipe gradeⅡ, while reduces the wall thickness and in the amount of reinforcing steel reinforcement ring.(6)The ability to resist chloride ion and water erosion corrosion is studied. The results show that the ability to resist chloride ion and water erosion corrosion of Ultra-high performance concrete is better than ordinary concrete, so it can significantly improve the life of the pipeline. Ultra High Performance Concrete’s 6h poeder through is about 10 C, which is low 1to 2orders compered with ordinary concrete. So it can well protect the steel inside the concrete from chloride ion etching. Ultra High Performance Concrete also showed good corrosion resistance in three Corrosive environments in experiment. It can effectively improve the life of drain pipeline. |
