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Anti-crack reinforcement material for long-life concrete products and its preparation method and application

A technology of concrete products and reinforcing materials, which is applied in the field of building materials, can solve the problems of uncoordinated development of product strength, crack resistance and durability, affect the durability and service life of concrete products, and uneven distribution of hydration products, etc., to achieve Significant social benefits and the environment, reducing unilateral water consumption, and increasing the effect of volume stability

Active Publication Date: 2021-11-09
CHINA BUILDING MATERIALS ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the disadvantages are also prominent, such as uneven distribution of hydration products, coarse and unreasonable pore structure, high temperature stress, increased brittleness, and easy cracks, which seriously affect the durability and service life of concrete products.
Existing technology overemphasizes early strength alone, ignores the importance of crack resistance, and lacks effective crack resistance measures, resulting in uncoordinated development of product strength, crack resistance and durability

Method used

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  • Anti-crack reinforcement material for long-life concrete products and its preparation method and application
  • Anti-crack reinforcement material for long-life concrete products and its preparation method and application

Examples

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preparation example Construction

[0038] The preparation method of the anti-crack reinforcing material for long-life concrete products of the above-mentioned embodiments 1-5 comprises the following steps:

[0039] The steel slag, fly ash, calcium carbide slag, gypsum and the stabilized modified material are uniformly mixed in the formulated amount to obtain the anti-crack reinforcing material for the long-life concrete product.

Embodiment 1

[0040]The method of using the anti-cracking reinforcing material for long-life concrete products in Example 1 is as follows: mix the above materials evenly to obtain the anti-cracking reinforcing material for long-life concrete products. The mixing ratio of the benchmark concrete test is powder (cement + anti-crack reinforcing material): fine aggregate: coarse aggregate: water: water reducer = 380:745:1118:152:3.5 (by weight). After adding water and stirring according to the above mixing ratio, prepare a 100mm×100mm×100mm cube specimen and a 100mm×100mm×300mm prism specimen with a longitudinal limiter respectively. Both the cube specimen and the prism specimen were steamed in a 40°C curing box for 6 hours, then taken out and cooled to room temperature (20±2)°C. According to GB / T 50081-2019 "Standards for Test Methods of Mechanical Properties of Ordinary Concrete" and GB 50119-2013 "Technical Specifications for the Application of Concrete Admixtures", the 6h limited expansion r...

Embodiment 2

[0041] The method of using the anti-cracking reinforcing material for long-life concrete products in Example 2 is as follows: mix the above materials evenly to obtain the anti-cracking reinforcing material for long-life concrete products. The mixing ratio of the benchmark concrete test is powder (cement + anti-crack reinforcing material): fine aggregate: coarse aggregate: water: water reducer = 380:745:1118:152:3.5 (by weight). After adding water and stirring according to the above mixing ratio, prepare a 100mm×100mm×100mm cube specimen and a 100mm×100mm×300mm prism specimen with a longitudinal limiter respectively. Both the cube specimen and the prism specimen were steamed in a 40°C curing box for 6 hours, then taken out and cooled to room temperature (20±2)°C. According to GB / T 50081-2019 "Standards for Test Methods of Mechanical Properties of Ordinary Concrete" and GB 50119-2013 "Technical Specifications for the Application of Concrete Admixtures", the 6h limited expansion ...

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Abstract

The invention relates to a crack-resistant reinforcing material for long-life concrete products and its preparation method and application. In terms of weight percentage, it comprises: steel slag: 50.0%-60.0%; fly ash: 20.0%-35.0%; carbide slag: 5.0%‑10.0%; Gypsum: 5.0%‑10.0%; Stabilizing modified materials: 1.0%‑2.0%. The present invention utilizes the stepped hydration characteristics of f-CaO and f-MgO in ultra-fine steel slag micropowder to make its expansive product Ca(OH) 2 and Mg(OH) 2 The generation rate matches the strength growth and volume change of the concrete used for the product, and establishes effective micro-expansion under the constraint, compensates the shrinkage of the concrete product, and increases the volume stability of the concrete product.

Description

technical field [0001] The invention belongs to the field of building materials, and relates to a crack-resistant reinforcing material, in particular to a crack-resistant reinforcing material for long-life concrete products and a preparation method and application thereof. Background technique [0002] my country will vigorously develop urban underground infrastructure construction, urbanization construction, sponge city construction, urban comprehensive pipeline construction and underground water storage space construction. These major constructions are used in my country's prefabricated pipe gallery, prefabricated concrete pipes, prefabricated box culverts, box girders, underground reservoirs, underground railway passages, underground pipe network pipes, power tunnels, sewage pipes and prefabricated concrete inspection wells, etc. Concrete products provide a large space for development and market demand, and at the same time, more stringent requirements are put forward for ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/18
CPCC04B40/0039C04B18/142C04B18/08C04B18/0481C04B14/104C04B24/18C04B18/144C04B22/146C04B22/145C04B28/00
Inventor 李长成刘立贾福杰赵顺增
Owner CHINA BUILDING MATERIALS ACAD
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