High-adhesion repair concrete for emergency repair of PCCP pipes and preparation method thereof

Abstract

The application relates to high-adhesive repair concrete for emergency repair of PCCP pipes and a preparation method thereof. The repair concrete includes two supporting concretes, which are high-viscosity and high-strength concrete A directly applied to the repair surface and high-strength concrete B applied to the surface of high-viscosity and high-strength concrete. Among them, the high-viscosity and high-strength concrete A is composed of the following components by weight: 60-100 parts of cement, 6-10 parts of ultra-fine steel fiber, 3-5 parts of polypropylene fiber, 1-2 parts of rubber powder, and water reducer 0.5‑2 parts, microsilica fume 12‑20, fly ash 6‑10, superfine aggregate 30‑50, water 20‑30 parts. The high-viscosity and high-strength concrete A of this composition can ensure that the repaired concrete structure has excellent compressive strength, flexural strength, bonding strength, and has extremely low shrinkage rate and resistance to chloride ion penetration.

Description

technical field [0001] The application relates to the field of concrete, in particular to high-adhesion repair concrete for emergency repair of prestressed concrete cylinder pipes (PCCP pipes) and a preparation method thereof. Background technique [0002] Prestressed steel cylinder concrete pipe (PCCP pipe) refers to a water delivery pipe made by winding a hoop prestressed steel wire on a high-strength concrete pipe core with a steel cylinder, and then forming a dense cement mortar protective layer on it. It is a composite pipe composed of thin steel plate, high-strength steel wire and concrete. It fully and comprehensively exerts the tensile strength, easy sealing of steel and the compressive and corrosion resistance of concrete, and has high sealing, high strength and high resistance. seepage properties. [0003] However, as the service life goes on, the concrete in the PCCP pipe gradually begins to age, which is prone to cracking, denudation and other defects, thus caus...

AI Technical Summary

Problems solved by technology

Traditional repair materials are mainly composed of cement-based cementitious materials, river sand, and water. The performance is relatively poor, and the strength is insufficient. It is difficult to match the repair layer with the base concrete, causing problems such as bulging, cracking and falling off.

[0004] For this reason, for the repair of specific PCCP pipes, this application is committed to solving defects such as cracking and erosion in the concrete of PCCP pipes, or when defects such as cracking and erosion are about to occur, when repairing the concrete structure of the defective part or potential defective part , there is no problem of repairing concrete used in particular, providing a kind of repairing concrete with high adhesion for emergency repair of PCCP pipes and its preparation method

Images