A bridge post-tensioned prestressed tunnel pressure grout and preparation method thereof

Abstract

The invention belongs to the technical field of bridge construction materials, and in particular relates to a bridge post-tensioning prestressed tunnel press grout and a preparation method thereof, which is characterized in that the press grout is composed of Portland cement clinker, mineral powder and a grout agent , the proportioning of Portland cement clinker, mineral powder, grouting agent is: Portland cement clinker 55% ~ 85%, mineral powder 5% ~ 25%, grouting agent 5% ~ 25% . The above-mentioned bridge post-tensioned prestressed channel grouting material has a simple process. The key is that it does not contain gypsum, fly ash, volcanic ash and light substances in the grouting agent. During the pressure stabilization period and the hardening period, there will be no laitance at the highest point of the curved pipe, and the strength is high. When the grout is recharged, it will not cause delamination after the grout is hardened after the second repressurization, which can effectively prevent the prestressed steel hinge. Corrosion and breakage of wires have a major impact on the safety and durability of bridge structures, and are of great significance for widespread promotion.

Description

technical field [0001] The invention belongs to the technical field of bridge construction materials, and in particular relates to a post-tensioned prestressed tunnel pressure slurry for bridges 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, th...

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