High-performance cement-based shrink-free corrosion-proof grouting agent

Abstract

The invention belongs to a post-tensioned prestressed concrete and girder drill-way grouting material adopting such ingredients as slushing (5-10 percent ), water retention (15-50 percent), plastic stage inflation (1-5 percent), later period microdilatancy (30-55 percent), anti-rust (0.2-0.8 percent), solidification adjustive agent (0.2-0.8 percent) and air-entraining admixture (0.5-0.1 percent). The cement-based non-contraction anti-corrosion grouting admixture preparation method is characterized in that the components get weighed according to the weight fraction and then poured into a mixer to produce the invention after even being stirred. The invention is utilized together with cement and water according to a certain proportion in engineering. The invention has the advantages that the raw material is sourced broadly, and the cost is low; bags are packed with on-spot mixture and the operation is easy with little, thereby causing little pollution; the invention has good fluidity and the operation time can be adjusted; no bleeding and delaminating happen when being positioned statically, and compressive stress causes a limited amount of water bleeding; the invention has good evenness, filling-in and bulk stability, without being contracted; excellent mechanical properties are also embodied; the invention is mixed with novel rust inhibitor to protect the reinforced steel bar.

Description

technical field [0001] The invention belongs to an admixture material for railway post-tensioned prestressed concrete beam channel grouting, specifically a high-performance cement-based non-shrinkage and anti-corrosion grouting agent. The formula is improved and can be used for road bridges and other post-tensioning The method has bonded prestressed structural channel grouting. Background technique [0002] Prestressed concrete technology makes full use of the compressive properties of concrete to prevent concrete cracking, thereby improving the mechanical properties and durability of concrete structures. It is an important construction technology for modern large-scale concrete structures, such as long-span bridges, offshore platform structures and nuclear reactor shells, etc. Wait. [0003] There are three points for tunnel grouting: ① Protect the prestressed steel bars from being exposed and corroded, and ensure the safe life of the prestressed concrete structure or comp...

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Problems solved by technology

[0006] According to a new search of previous documents, CN200410014079.X "Post-tensioned prestressed concrete high-performance grouting admixture" adopted the means of aluminum powder gas generation to compensate for the shrinkage in the plastic stage, but in the actual construction process, the aluminum powder It is still difficult to control the gas generation time and gas volume, and the current relevant specifications clearly stipulate that it is strictly forbidden to add aluminum powder to the grouting materials.

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