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High-activity crystal seed for concrete production and preparation method thereof

A concrete, high-activity technology, applied in the field of building materials, can solve the problems of poor later strength delay, poor durability, and instant concrete setting, so as to improve the speed and activity of seed crystal formation, and improve the quality and quantity. , the effect of reducing production energy consumption

Inactive Publication Date: 2012-05-02
EAST CHINA JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it may lead to two problems: if the time interval between production and application is short, it will easily lead to phenomena such as instant setting and rapid setting of concrete, which will cause poor initial structure of concrete, poor durability, and poor post-strength extension. Poor; if the time interval between production and application is long, it is not easy to preserve, and is susceptible to carbonization, dehydration, etc., which partially weakens the effect of crystal seeds on improving the early hydration performance of cement and mineral admixtures
However, this technology is mainly a traditional preparation technology that uses high-quality materials such as limestone and silicon to burn seeds at a high temperature of about 1450 ° C. The one-time resource consumption is large and energy consumption is high, which is not suitable for building materials. Industrial Sustainable Development Strategy

Method used

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  • High-activity crystal seed for concrete production and preparation method thereof
  • High-activity crystal seed for concrete production and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: a kind of preparation method of high activity crystal seed for concrete production, comprises the steps:

[0029] 1) Preparation of waste ceramic powder: The finished waste ceramics discharged from daily life are processed according to the preparation process of screening, water washing, drying, crushing and mechanical grinding. The mud content is 0.5%, paper chips, wood chips, etc. The content of debris is less than 1%, the moisture content is 0.5-0.8%, and the specific surface area of ​​Brinell is 300m 2 / kg, get waste ceramic powder, spare;

[0030] 2) Preparation of pre-ground calcium carbide slag powder: the calcium carbide slag discharged from acetylene production enterprises is prepared by dry method, dried in the sun and ground by vibration mill, and the moisture content of the calcium carbide slag powder after drying and grinding is 1%, Brinell specific surface area 350m 2 / kg, its Ca(OH) 2 Content greater than 70%, f-CaO content 1.5%, SO 3 If...

Embodiment 2

[0043] Embodiment 2: a kind of preparation method of the highly active crystal seed for concrete production, comprises the steps:

[0044] 1) Preparation of waste ceramic powder: The waste ceramics discharged from daily life are processed according to the preparation procedures of screening, water washing, drying, crushing and mechanical grinding. The content of other impurities is less than 1%, the moisture content is 0.2%, and the specific surface area of ​​Brinell is 280m 2 / kg, get waste ceramic powder, spare;

[0045] 2) Preparation of pre-ground calcium carbide slag powder: the calcium carbide slag discharged from acetylene production enterprises is prepared by dry method, dried in the sun and ground by vibration mill, and the moisture content of the calcium carbide slag powder after drying and grinding is 1%, Brinell specific surface area 300m 2 / kg, its Ca(OH) 2 Content 80%, f-CaO content less than 2.5%, SO 3 If the content is less than 2%, the calcium carbide slag...

Embodiment 3

[0049] Embodiment 3: a kind of preparation method of the high activity crystal seed that is used for concrete production, comprises the steps:

[0050] 1) Preparation of waste ceramic powder: The waste ceramics discharged from daily life are processed according to the preparation procedures of screening, water washing, drying, crushing and mechanical grinding. Material content 0.1%, moisture content 0.5%, Brinell specific surface area 300m 2 / kg, get waste ceramic powder, spare;

[0051] 2) Preparation of pre-ground calcium carbide slag powder: the calcium carbide slag discharged from acetylene production enterprises is prepared by dry method, dried in the sun and ground by vibration mill, and the moisture content of the calcium carbide slag powder after drying and grinding is 0.5%, Brinell specific surface area 320m 2 / kg, its Ca(OH) 2 Content is greater than 70%, f-CaO content is less than 2.5%, SO 3 If the content is less than 2%, the calcium carbide slag powder must be...

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Abstract

The invention relates to a high-activity crystal seed for concrete production and a preparation method thereof. The crystal seed is prepared by microwave strengthened calcination of the following components in percentage by weight: 70-90 percent of waste ceramic powder, 10-30 percent of pregrinded carbide slag powder and 2-5 percent of modified additive. The preparation method comprises the stepsof: taking the components and mixing and grinding according to the proportion, and adding the modified additive in the mixing and grinding process; mixing and grinding until the Brinell specific surface area is 350-400m<2> / kg, homogenizing and placing into an electric heating furnace; and after heating to 800-1,000 DEG C, immediately transferring to a microwave oven with power 600-800W, heating for 90-120 seconds by microwaves and then grinding to 400-450m<2> / kg by adopting vibration grinding. The crystal seed can rapidly promote early hydration of a cement and mineral mixture, obvious improves the early strength of concrete, has good transitive ductility of later strength, no adverse effect on durability and obvious technical, economic and social environmental protection benefit and resource and energy saving.

Description

technical field [0001] The invention belongs to building materials, and in particular relates to a highly active crystal seed used in concrete production and a preparation method thereof. Background technique [0002] As we all know, crystal seeds have the following functions in concrete. On the one hand, it can reduce the nucleation barrier of hydration products in the early stage of cement hydration, induce rapid hydration of cement, thereby improving the early strength of concrete and speeding up the construction progress of concrete projects, etc.; On the one hand, because the early hydration of cement is accelerated, the alkalinity of the material system is increased, which can provide mineral admixtures (such as slag, fly ash, etc.) with more favorable activity to stimulate external environmental conditions, thereby improving the mineral admixture The early hydration rate of the admixture compensates for the decrease in the early strength of the high-volume mineral adm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B22/08B09B3/00
CPCC04B40/0039Y02W30/91C04B14/30C04B14/307C04B18/12C04B18/141C04B18/165C04B20/026C04B20/04C04B22/126C04B28/02C04B40/0028
Inventor 王凯陈梦成
Owner EAST CHINA JIAOTONG UNIVERSITY
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