Special mortar compacting agent suitable for improving durability of PCCP protective layer mortar and preparation method thereof

Abstract

The invention discloses a special-purpose mortar compacting agent for improving PCCP protective layer mortar endurance and a preparation method thereof. The special-purpose mortar compacting agent comprises, by weight, 0.5-10% of a water reducer, 30-50% of a film forming agent, 0.01-0.5% of a water-retaining agent, 0.005-0.5% of a shrinkage reducing agent, 0.005-0.05% of an antifoaming agent and 39-69% of water. The preparation method comprises adding water into a mixer, starting the mixer, after the mixer operates smoothly, orderly and slowly adding all ingredients into the mixer and after the materials are fully dissolved, carrying out uniform stirring. The special-purpose mortar compacting agent can be used in PCCP protective layer mortar, can obviously improve PCCP protective layer mortar permeability resistance, cracking resistance, shedding resistance, erosion resistance and freezing resistance, can improve PCCP pipe endurance and can further accelerate promotion and use of a PCCP pipe in large-scale water conveying engineering construction. The preparation method has simple processes, realizes a low cost, is environmentally friendly and is an effective economical technical method for ensuring PCCP pipe endurance.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a special mortar compacting agent suitable for improving the durability of PCCP protective layer mortar and a preparation method thereof. Background technique [0002] Prestressed steel cylinder concrete pipe (referred to as PCCP) is the first generation of prestressed concrete pressure pipe developed on the basis of the introduction and assimilation of advanced technology and key equipment from the United States in the past ten years. PCCP pipe products are environmentally friendly, low production cost, fast construction speed, and high durability. In recent years, they have been widely used and promoted in domestic large-scale water transmission projects. [0003] The design life of PCCP is generally 50 years. Since PCCP is prone to cracks and the underground environment is corrosive, the actual life of PCCP has always been a matter of great concern. Sin...

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Problems solved by technology

[0006] Aiming at the problems of poor durability of PCCP protective layer mortar such as poor compactness, easy cracking, and falling off, and in erosive soil and groundwater, it is easy to cause corrosion of protective prestressed steel wires and cause PCCP failure accidents. The present invention provides a PCCP protective layer suitable for improving A special mortar compacting agent for mortar durability and a preparation method thereof. The present invention uses a reasonable combination of water reducing agent, film forming agent, water retention agent, shrinkage reducing agent and defoaming agent to prepare a mortar that can improve the compactness and flexibility of the PCCP protective layer. Mortar compacting agent with cohesive properties

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