Preformed material for post-tensioned prestressing pipeline vacuum grouting or mudjacking and preparation method thereof

Abstract

The invention discloses a preformed material for post-tensioned prestressing pipeline vacuum grouting or mudjacking and a preparation method thereof. The preformed material includes the following components by weight percent: 65 to 95 percent of silicate cement, 0.01 to 3 percent of high-range water-reducing agent, 0 to 1 percent of stabilizing agent, 0.05 to 5 percent of retarding agent, 1 to 20 percent of expanding agent, 0.2 to 2 percent of corrosion inhibitor, 0.01 to 1 percent of air entraining agent and 0 to 30 percent of mineral materials, wherein by uniformly and proportionally mixing the silicate cement, the high-range water-reducing agent, the stabilizing agent, the retarding agent, the expanding agent, the corrosion inhibitor, the air entraining agent and the mineral materials, the post-tensioned prestressing pipeline vacuum grouting or mudjacking preformed material can be obtained. After being uniformly mixed and stirred with water with neutral pH value according to the water cement ratio ranging from 0.24 to 0.32, the preformed material can be used, the obtained grouting material has the advantages of low water cement ratio, favorable flowability, no water bleeding and delamination, and favorable pumpability; meanwhile, the preparation method of the preformed material is simple and the raw material sources of the preformed material are wide.

Description

technical field [0001] The invention relates to a vacuum grouting or grouting prefabricated material for a post-tensioned prestressed pipeline and a preparation method thereof, belonging to the field of construction materials. Background technique [0002] With the rapid development of my country's economy, my country's highway and railway construction has entered a period of rapid development. In order to ensure the service life of the bridge, how to make the key grouting of the prestressed pipeline of the bridge dense, reduce the loss of prestress, and prevent the steel bars from rusting is a key technical problem. Vacuum grouting or grouting construction technology for bridge post-tensioned prestressed pipelines is a new technology for large-scale bridge construction. In prestressed structures, the quality of grouting directly affects the safety and reliability of the structure. The prestressed grouting material is a key material to protect the prestressed steel bar fro...

AI Technical Summary

Problems solved by technology

The main manifestations are: (1) The fluidity of the freshly mixed slurry is not good, and the pumpability is poor; (2) The slurry has a large bleeding, which is easy to segregate and stratify, and the slurry is powdered at the high point, and the pipeline is difficult to be full; (3) After hardening, the slurry is not dense, there are many voids, and the bond with the prestressed tendons is not solid