Toughening method for cement-based material

Abstract

The invention discloses a toughening method for a cement-based material. The method comprises the following steps of selection of raw materials, design of a mixing ratio and mixing of the raw materials. The selection of the raw materials further comprises the following steps of gel material selection, fine aggregate selection, coarse aggregate selection, polymer selection, fiber selection and water reducing agent selection. According to the method, a composite technology for industrial waste residues, fibers, polymers and cement clinker is adopted, the performance of each composition with different chemical components is superposed in a structure forming process, the compositions gradually play a role step by step at the corresponding performance level, and the effect of complementing advantages is achieved; the capacity of reinforcing and toughening a cement matrix is greatly improved .The high-performance cement-based composite material with the strength grade of 60 MPa is prepared,and the bending toughness and fracture performance of the material are improved.

Description

technical field [0001] The technical field of the present invention is the design and construction method of building materials, and in particular relates to a method for toughening cement-based materials. Background technique [0002] High strength, high stiffness, and high toughness are the development trend of concrete material performance requirements in the field of civil engineering, and also meet the requirements of large-scale construction projects for material crack resistance and durability. Compared with ordinary concrete, fiber reinforced concrete is superior in mechanical properties, and can significantly improve the tensile, bending, and fracture properties of concrete. However, there is an interface layer between the fiber and the cement matrix, and the interface layer is a composite material. In the weak area, how to strengthen the interface layer is that the steel fiber plays a key role in the reinforcement, toughening and crack resistance of the concrete. ...

AI Technical Summary

Problems solved by technology

[0005] At present, my country is in the peak period of high-speed railway construction, and tunnels are an important part of high-speed railway construction. As a safety reserve for tunnel structures, the lining structure needs to have certain bending toughness, crack resistance and durability, among which bending toughness is the most important The core link, at present, the lining structure of the high-speed railway tunnel built earlier in the world generally adopts plain concrete structure. As the operation time goes by, non-structural cracks in the tunnel lining continue to appear and develop, and the maintenance work continues to increase. The durability of the lining structure is problematic. Gradually become prominent, and even endanger the operation safety of high-speed trains. All countries in the world are actively researching and testing corresponding measures and methods. For example, Germany adopts a single-layer steel mesh armor structure for lining concrete, but the steel mesh armor structure is expensive and difficult to construct. The process takes a long time. This patent invented a new type of concrete material that is applied to the tunnel lining structure, which can significantly improve the performance of the lining structure.

Images