Prestressed pore pressure slurry and grouting method thereof

Abstract

The invention provides prestressed pore pressure slurry and a grouting method thereof. The pore pressure slurry is composed of cement, a water reducing agent, a retarder, a coagulant, an antifreezing agent, an expanding agent, active mineral powder and mineral filler powder. The pore grouting method comprises the following steps of: mixing the raw materials according to the composition and content to prepare pressure slurry, firstly adding water, and then, adding the pressure slurry into an agitator according to a certain ratio of water to the pressure slurry, controlling the rotating speed, time and water temperature for pulping, and immediately grouting. The prestressed pore pressure slurry provided by the invention has the advantages of low water-binder ratio, high fluidity and no water seepage, such heat preservation measures as steam curing are not adopted under the environment of minus 5 DEG C to 5 DEG C, the final setting time of the slurry is not larger than 5h, and the 28d strength is not smaller than 50 MPa, so that the prestressed pore pressure slurry is an energy-saving and environment-friendly building material.

Description

technical field [0001] The invention relates to a prestressed tunnel press grout and a grouting method thereof, more specifically, a prestressed tunnel press grout and a grouting method used in an environment of -5°C to +5°C. Background technique [0002] Prestressed concrete is widely used in bridge structures due to its unique economic and technical advantages. Grouting of tunnels is a key process of prestressed concrete construction. Its main functions are: first, to protect the prestressed steel strands from being exposed and avoid corrosion; The second is to make the prestressed steel strand and concrete well combined to ensure the effective transmission of prestress, so that the prestressed steel strand and concrete load together; the third is to eliminate the prestressed concrete structure under repeated loads, due to stress changes on the anchorage The fatigue damage caused by it improves the reliability and durability of the component. [0003] Studies have shown t...

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Problems solved by technology

[0005] The invention provides a prestressed tunnel grouting material and a grouting method thereof, which solve the problems of serious bleeding, failure to harden normally and problems caused by post-tensioned prestressed concrete tunnel grouting construction under the environmental condition of -5°C to +5°C. The problem of strength reduction can avoid the long construction period, high cost and unguaranteed quality of grouting caused by traditional steam curing and other heat preservation methods, and ensure the normal grouting construction in autumn and winter

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