Modified limestone powder high-performance mineral admixture and preparation method thereof

A limestone powder, high-performance technology, applied in the field of modified limestone powder high-performance mineral admixture and its preparation, can solve the unfavorable quality and cost control of ready-mixed concrete, the improvement of cement and concrete performance is not obvious, and the loss of concrete workability is accelerated and other problems, to achieve the effect of good workability and strength, prolong the setting time, and accelerate the hydration of cement

Active Publication Date: 2014-03-05
CHINA STATE CONSTR READY MIXED CONCRETE CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the method of processing stone powder is mainly used as cement admixture, but this method does not significantly improve the performance of cement and concrete, and its dosage is low, and the technical and economic benefits are very limited. However, it is directly used as a concrete mineral admixture When the dosage is large, it will not only reduce the strength grade of concrete, but also accelerate the hydration reaction of cement, resulting in accelerated loss of concrete workability. It is necessary to develop suitable water reducers for regulation, which is not conducive to ready-mixed concrete Quality and Cost Control

Method used

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  • Modified limestone powder high-performance mineral admixture and preparation method thereof
  • Modified limestone powder high-performance mineral admixture and preparation method thereof
  • Modified limestone powder high-performance mineral admixture and preparation method thereof

Examples

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Effect test

Embodiment 1

[0029] A high-performance composite mineral admixture of modified limestone powder, which comprises the following components in parts by mass: 40 parts of limestone powder, 55 parts of phosphorus slag, 5 parts of active calcium-aluminum modifier, and 0.2 parts of reinforcing activator part; the calcium-aluminum modifier is composed of carbide slag 40wt% and metakaolin 60wt% in mass percentage; the enhanced activator is composed of methylolacrylamide-acrylamide copolymer 10wt% in mass percentage, polymerization Alcohol amine 30wt% and triisopropanolamine 60wt%.

[0030] Dry the above-mentioned limestone powder, phosphorous slag and active calcium-aluminum modifier at 105°C and mix them evenly to obtain a mixed powder, mix it with a reinforcing activator, put it in a ball mill, and grind it for 20-50 minutes to obtain a modified limestone powder The specific surface area of ​​the finished high-performance composite mineral admixture was measured at different grinding times, as s...

Embodiment 2-4

[0037]The mass parts of each component of the modified limestone powder high-performance composite mineral admixture described in embodiment 2-4 are shown in Table 2, wherein, the limestone powder and phosphorus slag adopted in each embodiment are all the same, and the active calcium aluminum The compositions of the quality modifier and the reinforcement activator are also the same. The calcium-aluminum modifier is composed of 50wt% calcium carbide slag and 50wt% metakaolin in terms of mass percentage; the reinforcing activator is composed of 10wt% of methylolacrylamide-acrylamide copolymer, polymerized alcohol 35wt% and triisopropanolamine 55wt%.

[0038] Dry the above-mentioned limestone powder, phosphorous slag and active calcium-aluminum modifier at 105°C and mix them evenly. The mixed powder obtained is mixed with the reinforcing activator and placed in a ball mill. Grinding for 30 minutes, the high-performance modified limestone powder is obtained. Composite mineral adm...

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Abstract

The invention relates to a modified limestone powder high-performance mineral admixture and a preparation method thereof. The invention is characterized in that the modified limestone powder high-performance mineral admixture is prepared by mixing and grinding the following raw materials in parts by mass: 40-60 parts of limestone powder, 35-55 parts of phosphorus slag, 5-10 parts of active calcium aluminum modifier and 0.1-0.2 part of reinforced activator. The concrete mineral admixture prepared by the method solves the problems of high loss of concrete workability, low strength and the like in the common limestone powder admixture; when substituting 50-100% of I-grade fly ash or 20-50% of I-grade fly ash and 100% of S75-grade mineral powder in concrete by equal quality, the concrete mineral admixture can improve the concrete workability, and has the characteristics of quick development of early strength and stable later strength.

Description

technical field [0001] The invention relates to a modified limestone powder high-performance mineral admixture and a preparation method thereof. Background technique [0002] In recent years, with the acceleration of urbanization, the amount of concrete has increased rapidly, coupled with the country's macro-control of thermal power plants and metallurgical industries, as well as the constraints of the existing production level of mineral admixtures, resulting in high-quality fly ash, finely ground ore The regional supply of concrete mineral admixtures such as powder is becoming increasingly tight, which will make it difficult to meet the demand for concrete production. Therefore, there is an urgent need to find other alternative mineral admixtures. [0003] my country is rich in stone mineral deposits and is the largest country in the production of architectural decorative stone. However, due to the relatively backward equipment and technology of many manufacturers, a lar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/16C04B22/06
Inventor 王军高育欣陈景刘永道徐芬莲王业江
Owner CHINA STATE CONSTR READY MIXED CONCRETE CO LTD
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