Toughening method for cement-based material

A cement-based material and toughening technology, which is applied in the field of cement-based material toughening, can solve the problems of high cost of reinforced mesh armor structure, endangering the safety of high-speed train operation, and long process time, so as to optimize the micro and mesostructure, Save resources and energy, suppress the effects of initiation and expansion

Inactive Publication Date: 2019-05-24
SHENZHEN YJY BUILDING TECH +1
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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 c...

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  • Toughening method for cement-based material

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preparation example Construction

[0148] In addition to optimizing the material composition of the concrete preparation technology, in order to make the components evenly distributed in the system, the preparation method is an important aspect to ensure the flexural toughness of the concrete. Its key technology lies in the uniform mixing of fly ash, cement and polymer emulsion and the uniform distribution in the fiber cement matrix. There are two main methods for the uniform distribution of fibers in the cement matrix, one is the "dry first and then wet" mixing method, and the other is to sprinkle the fibers evenly while the cement matrix is ​​wet mixing. Because the second method must have special equipment for uniform distribution of fibers, otherwise it is inefficient and unsafe to do it manually, so it is not suitable for use. For this reason, this embodiment adopts the mixing method of first drying and then wet: first mix the fibers, Coarse aggregate, fine aggregate, and cement are combined to make the fi...

specific Embodiment 1

[0193] Specific Example 1: Application of Fiber Reinforced Polymer Concrete in Tunnel Lining Engineering

[0194]According to the principle of the New Austrian Law, the tunnel project can be regarded as a two-stage construction. The first stage is the main support of the underground project, including anchor rods, steel mesh, steel arches and shotcrete, etc.; the second stage is constructed with cast-in-place concrete. Inner lining, including floor or invert.

[0195] (1) The lining is not an independent structure. The load it bears and its own performance are controlled by the characteristics of the surrounding strata. The construction of the lining in the underground structure is a problem of the interaction between the surrounding rock and the structure, and the focus is on the surrounding rock itself. stability conditions.

[0196] (2) The lining redistributes the load to the surrounding rock like a thin shell. Since the surrounding rock deforms together with the shotcre...

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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. ...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B111/34
Inventor 曹擎宇王罡郝挺宇常正非龚超张泽宇张雷白劲松
Owner SHENZHEN YJY BUILDING TECH
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