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High-activity cementing material based on engineering residue soil

A technology of cementitious materials and engineering dregs, which is applied in the direction of cement production, etc., can solve the problems of low grinding efficiency, easy aggregation of particles, and high cost of alkali activators, so as to achieve low production costs, simple and easy-to-obtain materials, and eliminate dregs Aggregate effect

Active Publication Date: 2021-09-07
深圳市衡骏环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But still there are following problems: (1) the cost of alkali activator in this method is higher; (2) when engineering slag is crushed, the particles are easy to aggregate, and the grinding efficiency is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The highly active cementitious material based on engineering dregs provided in this example is prepared by the following method:

[0022] (1) Mix and grind 70 parts of engineering dregs, 10 parts of siliceous tailings and 10 parts of fly ash to obtain a mixed powder with a specific surface area of ​​360-440m 2 / kg; (2) Put 10 parts of mixed powder and kiln dust into a sagger, and calcinate in a calcining kiln at 700-800°C for 2-3 hours; (3) Grind the calcined product into powder, Obtain highly active gelling material, the specific surface area of ​​the highly active gelling material is 420-500m 2 / kg.

[0023] The above-mentioned high-activity cementitious material is mixed into P·O52.5 cement, and the 28d compressive strength of the cement with 25% high-active cementitious material is 44.3Mpa, and the 28d compressive strength of P·O52.5 cement is 54.6 MPa, then the activity index A of cement with 25% high activity cementitious material 28 is 81%, the highly active c...

Embodiment 2

[0025] The highly active cementitious material based on engineering dregs provided in this example is prepared by the following method:

[0026] (1) Mix and grind 75 parts of engineering dregs, 5 parts of siliceous tailings and 5 parts of fly ash to obtain a mixed powder with a specific surface area of ​​360-440m 2 / kg; (2) put 15 parts of the mixed powder and kiln dust into the sagger, and calcinate in the calcining kiln at 700-800°C for 2-3 hours; (3) grind the calcined product into powder, Obtain highly active gelling material, the specific surface area of ​​the highly active gelling material is 420-500m 2 / kg.

[0027] The above-mentioned high-activity cementitious material is mixed in the P · O52.5 cement, and the activity index A of the cement of the high-activity cementitious material that admixture is 25% 28 was 78%, the highly active cementitious material prepared in this example has relatively high gelling activity, and the preliminary activity of concrete is high....

Embodiment 3

[0029] The highly active cementitious material based on engineering dregs provided in this example is prepared by the following method:

[0030] (1) Mix and grind 75 parts of engineering dregs, 10 parts of siliceous tailings and 10 parts of fly ash to obtain a mixed powder with a specific surface area of ​​360-440m 2 / kg; (2) Put 10 parts of mixed powder and kiln dust into a sagger, and calcinate in a calcining kiln at 700-800°C for 2-3 hours; (3) Grind the calcined product into powder, Obtain highly active gelling material, the specific surface area of ​​the highly active gelling material is 420-500m 2 / kg.

[0031] The above-mentioned high-activity cementitious material is mixed in the P · O52.5 cement, and the activity index A of the cement of the high-activity cementitious material that admixture is 25% 28 was 77%, the highly active cementitious material prepared in this example has relatively high gelling activity, and the initial activity of concrete is high.

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Abstract

The invention provides a high-activity cementing material based on engineering residue soil, and the material is prepared from the following raw materials in parts by mass: 70 to 80 parts of engineering residue soil, 5 to 10 parts of siliceous tailings, 5 to 10 parts of fly ash and 10 to 15 parts of kiln dust, the preparation method comprises the following steps: (1) mixing the engineering residue soil, the siliceous tailings and the fly ash, and grinding to obtain mixed powder; (2) putting the mixed powder and kiln dust into a calcining container, and performing calcining in a calcining kiln at 700-800 DEG C for 2-3 hours; (3) grinding the calcined product into powder to obtain the high-activity cementing material. The materials of the high-activity cementing material are simple and easy to obtain, resource utilization of the engineering residue soil and the siliceous tailings is achieved, the production cost is low, meanwhile, the cementing material has high cementing activity through thermal and chemical excitation dual treatment, and the early-stage activity of concrete can be remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of cementitious materials, and in particular relates to a highly active cementitious material based on engineering dregs. Background technique [0002] With the rapid development of urbanization in my country, a large amount of construction waste has been generated in recent years. In 2020, the annual generation of construction waste will exceed 3.5×10 9 t, about 7 to 8 times the amount produced in 2006. According to the definition of my country's industry standard "Technical Standards for Construction Waste Disposal", construction waste refers to the construction, construction units newly built, rebuilt, expanded and demolished various buildings, structures, pipe networks, etc. Discards and other wastes can be divided into five categories: engineering dregs, engineering mud, engineering waste, demolition waste and decoration waste. In 2018, the Ministry of Housing and Urban-Rural Development organized 35 c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/28C04B7/26C04B7/24C04B7/38C04B7/44
CPCC04B7/28C04B7/26C04B7/24C04B7/38C04B7/44Y02P40/10
Inventor 王文圣黄修林舒畅
Owner 深圳市衡骏环保科技有限公司
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