Special porelike grouting agent for bridge concrete

Abstract

The invention discloses a special porelike grouting agent for bridge concrete, which is characterized by being prepared from the following additives in proportion: 81.5-90.8 percent of dispersing agent, 4-8 percent of water reducing agent, 0.2-0.5 percent of plastic expanding agent, 1-3 percent of enhancer and 4-7 percent of adjustable solidification agent. Compared with the prior art, the special porelike grouting agent has the following remarkable advantages: the flowability is excellent, the mud jacking has the characteristics of fullness, early strength, minimum inflation and the like, the product has higher fullness, one-time mud jacking construction can be realized, slurry inside a pipe is compact and clearance-free, prestressed reinforcement is not corroded and firmly sticked with concrete, a plurality kinds of materials are not needed on the spot, out-of-date products are eliminated, energy consumption is reduced, and the special porelike grouting agent can be used immediately when water and cement are added and uniformly stirred on the spot, the operation is simple and convenient, the durability of bridges is improved, and the service life of bridges are prolonged.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a tunnel grouting agent specially used for bridge concrete. Background technique [0002] With the rapid development of the national high-speed network, railway network, and municipal bridges, the widespread use of prestressed structures of long-span bridges, the demand for bridge concrete grouting agents is increasing. Bridge concrete technology is a new technology promoted by the Ministry of Construction. It is widely used in buildings, bridges and special engineering structures, and is an indispensable part of construction technology. The key technology to ensure the service life of the prestressed concrete structure is to make the prestressed tunnel grouting dense, reduce the loss of prestressed force, and prevent the corrosion of steel bars. The quality and adaptability of the grouting agent greatly affect the safety factor and service life of the bri...

AI Technical Summary

Problems solved by technology

The current grouting materials have the following deficiencies: 1. The use of various outdated raw materials for pulping makes construction difficult, and the strength of the water-cement ratio is too high; 2. The design concept, pulping equipment, and inspection methods are backward in the design process , causing the slurry index to fail to meet the specification requirements; 3. The unreliability of construction equipment and construction technology leads to uncontrollable products; 4, especially in Xinjiang and other areas with harsh temperature environments, where the temperature difference between day and night is large and the materials are highly alkaline. When the grouting agent is used in this area, it cannot meet the specification requirements, such as fluidity, water-binder ratio, bleeding rate, swelling degree, setting time and flexural and compressive strength are all affected

Most of the grouting agents commonly used in the market cannot meet the requirements of the new specification