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A kind of ground rice husk ash-based composite admixture and its application

A composite admixture, rice husk ash technology, applied in the field of building materials, can solve the problem of not giving a guidance plan, reduce early hydration heat and other problems, and achieve the effects of improving work performance, reducing early hydration heat, and increasing strength

Active Publication Date: 2021-09-03
SHIJIAZHUANG CHANGAN YUCAI BUILDING MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The above technologies have a great impact on how to make the ground rice husk ash-based composite admixture to improve the work performance of concrete, significantly increase the strength of concrete, reduce the early heat of hydration, reduce concrete cracking and reduce the amount of concrete cement on the premise of reducing the amount of concrete cement. Shrinkage and deformation, and it does not contain harmful substances such as chlorine salts, and no specific guidance is given

Method used

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  • A kind of ground rice husk ash-based composite admixture and its application
  • A kind of ground rice husk ash-based composite admixture and its application

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Embodiment 1

[0019] Embodiment 1: the ground rice husk ash-based composite admixture of the present invention is made of the following raw materials in mass percent: ground rice husk ash 30%, glass microspheres 30%, metakaolin 18%, Ultrafine silica fume 10%, steel slag 5%, limestone powder 5%, activator 1.0%, superplasticizer 0.5%, reinforcing agent 0.5%.

[0020] The above-mentioned ground rice husk ash is a powder with a loss on ignition ≤ 10% made of rice husk after being calcined at 600°C to 610°C for 2 hours, then naturally cooled and ground; the above-mentioned glass microspheres are a kind of continuous particle size distribution The ultra-fine glass sphere powder material is formed by sinking beads, and its particle size is D50, that is, the median diameter is ≤3.0um; the above-mentioned metakaolin is kaolin that is calcined at 800°C to 810°C for 2 hours and then finely ground. The particle size D50 is the median diameter D50≤10um; the silicon dioxide content in the above-mentioned...

Embodiment 2

[0022] Embodiment 2: The ground rice husk ash-based composite admixture of the present invention is made of the following raw materials in mass percent: ground rice husk ash 35%, glass microspheres 20%, metakaolin 20%, Ultrafine silica fume 15%, steel slag 5%, limestone powder 3%, activator 0.5%, superplasticizer 0.7%, reinforcing agent 0.8%.

[0023] The above-mentioned ground rice husk ash is a powder with a loss on ignition ≤ 10% made of rice husk after being calcined at a high temperature of 690°C to 700°C for 2 hours, then ground naturally; The ultra-fine glass sphere powder material is a composition formed of two raw materials, sinking beads and floating beads. The mass ratio of sinking beads and floating beads is 1:3. The particle size of glass beads is D50, that is, the median diameter is ≤ 3.0um; the above-mentioned metakaolin is made by kaolin calcined at 890°C to 900°C for 2 hours and then ground, and its particle size is D50, that is, the median diameter D50≤10um; ...

Embodiment 3

[0025] Embodiment 3: the ground rice husk ash-based composite admixture of the present invention is made of the following raw materials in mass percent: ground rice husk ash 40%, glass microspheres 22%, metakaolin 15%, Ultrafine silica fume 8%, steel slag 7%, limestone powder 5%, activator 0.5%, superplasticizer 0.5%, reinforcing agent 2.0%.

[0026] The above-mentioned ground rice husk ash is a powder with a loss on ignition ≤ 10% made of rice husk after being calcined at 630°C to 640°C for 2 hours and then ground naturally; The ultra-fine glass sphere powder material is a kind of raw material of floating beads, and its particle size is D50, that is, the median diameter is ≤3.0um; the above-mentioned metakaolin is made of kaolin after being calcined at 850°C to 860°C for 2 hours and then finely ground. , the particle size D50 is the median diameter D50≤10um; the silicon dioxide content in the above-mentioned ultrafine silica fume is 90%-98%, and the specific surface area is 2...

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Abstract

A ground rice husk ash-based composite admixture and its application. The ground rice husk ash-based composite admixture is a composite material mixed with various ultrafine powders on the basis of ground rice husk ash. The mass percentages are: ground rice husk ash 30%-40%, glass microspheres 20%-30%, metakaolin 15%-25%, superfine silica fume 5%-15%, steel slag 5%-10% , 1% to 5% of limestone powder, 0.5% to 1.0% of activator, 0.5% to 1.0% of superplasticizer, and 0.5% to 2.0% of reinforcing agent. When preparing high-performance concrete, it is mixed into the concrete cementitious material, and the cement is replaced by composite admixture, and the replacement amount is 15% to 25% of the total cementitious material. The finely ground rice husk ash-based composite admixture of the present invention has good performance, it can not only improve the working performance of concrete, but also improve the mechanical properties of cement-based composite materials, and the preparation process is simple, and it is especially suitable for the preparation of high-strength and high-performance concrete .

Description

technical field [0001] The invention relates to a composite admixture, in particular to a ground rice husk ash-based composite admixture, which belongs to the technical field of building materials, and also relates to the application of the ground rice husk ash-based composite admixture. Background technique [0002] With the acceleration of my country's modernization process and the increasing scale of buildings, higher requirements are put forward for concrete in construction projects. Due to its high durability, high workability, high strength and high volume stability and many other excellent properties, high-performance concrete has been applied in many important projects, especially in bridges, high-rise buildings and harbor buildings. The use of new high-performance water reducing agents and high-quality mineral admixtures is the main measure for high-performance concrete, especially composite admixtures (containing two or more mineral admixtures), which are mixed int...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/12C04B18/10
CPCC04B40/0039C04B18/101C04B14/22C04B14/041C04B18/146C04B18/142C04B22/147C04B2103/302C04B24/122C04B22/10C04B18/08C04B12/04Y02W30/91
Inventor 赵明敏汪咏梅刘昭洋康静刘旭飞李茜茜王进春刘翠芬
Owner SHIJIAZHUANG CHANGAN YUCAI BUILDING MATERIALS
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