Novel bridge post-tensioned prestressed tunnel grouting material and preparation method thereof

Abstract

The invention belongs to the technical field of bridge construction materials and relates to a novel bridge post-tensioned prestressed tunnel grouting material and a preparation method thereof. The novel bridge post-tensioned prestressed tunnel grouting material comprises 55-85% of portland cement clinker, 5-25% of ore powder and 5-25% of a grouting agent. The novel bridge post-tensioned prestressed tunnel grouting material is prepared by simple processes, does not contain gypsum, fly ash, vulcanic ash and light substances of a grouting agent, does not produce laitance at the highest point of a curve pipe under pressure in bridge post-tensioned prestressed tunnel grouting and in a voltage stabilization period and in a hardening period, has high strength, does not cause layering after secondary supplied grouting liquid hardening in grouting liquid supply treatment, effectively prevents prestressed strand corrosion and fracture, produces great influence on bridge structure safety and endurance and has a wide popularization meaning.

Description

technical field [0001] The invention belongs to the technical field of bridge construction materials, and in particular relates to a novel bridge post-tensioned prestressed tunnel pressure slurry and a preparation method thereof. Background technique [0002] At present, there is a certain amount of floating slurry at the highest point of the curved pipe during the grouting construction of the bridge prestressed tunnel. The floating slurry mainly comes from the light material in the raw material of the grouting material, and has low strength and looseness. These light substances will float up under the action of pressure during the grouting process and during the pressure stabilization period, and the bleeding produced under the action of pressure during the hardening process will also drive the light substances to float up. These light substances include: gypsum, fly ash, volcanic ash and light substances in the grouting agent; and depending on the length of the pipeline, t...

AI Technical Summary

Problems solved by technology

During the construction of the first line, it was found that although grouting treatment was carried out at the parts where the grouting was not dense, the effect of grouting was seriously affected due to the existence of this layer of laitance, and the strength of this layer of laitance Low and loose, resulting in delamination after the hardening of the secondary pressure grout, endangering the corrosion of the prestressed steel hinge, and even causing the steel hinge to break, which affects the safety and durability of the bridge structure