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Calcium sulphoaluminate or calcium sulphoaluminate-calcium oxide concrete expanding agents as well as preparation method and application thereof

A technology of calcium sulfoaluminate and calcium oxide, which is applied to improve the performance of concrete against drying shrinkage and temperature shrinkage, calcium sulfoaluminate or calcium sulfoaluminate-calcium oxide full clinker concrete expansion agent and its preparation field It can solve the problems that the rotary kiln cannot be industrialized, the firing process is difficult to control, and the sintering temperature range is narrow, so as to eliminate and reduce clinker ring formation, increase output, and increase clinker output.

Active Publication Date: 2014-01-08
CHINA BUILDING MATERIALS ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The performance of CSA expanded clinker is generally recognized, but its sintering temperature range is narrow, the liquid phase is large, and the firing process is extremely difficult to control. According to the general process, it is impossible to carry out industrial production on the rotary kiln. The main reason is that the firing process cannot be solved. Technical problems such as material looping and melt flow are also the reasons why Japan adopts the electric furnace melting and calcination process to produce this clinker. However, the electric furnace melting and calcination process has the disadvantages of high power consumption and low output due to the use of electric furnaces, resulting in increased production costs.

Method used

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  • Calcium sulphoaluminate or calcium sulphoaluminate-calcium oxide concrete expanding agents as well as preparation method and application thereof
  • Calcium sulphoaluminate or calcium sulphoaluminate-calcium oxide concrete expanding agents as well as preparation method and application thereof
  • Calcium sulphoaluminate or calcium sulphoaluminate-calcium oxide concrete expanding agents as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1-11

[0051] Example 1-11. Preparation of calcium sulfoaluminate-based fully clinker concrete expansion agent and performance testing

[0052] In the raw material formula of the calcium sulfoaluminate type full clinker concrete expansion agent shown in Table 1, the total amount of limestone used is 44wt% (comparative examples 1, 2, 3), and replaces limestone with different calcium oxide amounts simultaneously (embodiment 1-11), the change is set according to Table 1; the dosage of anhydrite is 42wt%, and the dosage of alumina is 14wt%.

[0053] The batching amount of calcium oxide is calculated according to the content of calcium oxide in calcium carbonate, that is, 1 part by weight of calcium oxide is equivalent to 1.785 parts by weight of calcium carbonate.

[0054] The preparation method of the expansion agent is: use a hollow rotary kiln (model φ1.6×32m) with a diameter of 1600mm hot end to expand to 1900mm, calcinate the raw materials as listed in Table 1, and use coal powder w...

example 12-17

[0061] Example 12-17. Preparation of calcium sulfoaluminate-calcium oxide full clinker concrete expansion agent and performance testing

[0062] In the raw material formula of calcium sulfoaluminate-calcium oxide full clinker concrete expansion agent shown in Table 2, the total amount of limestone is 75wt% (comparative examples 4, 5, 6), and different amounts of calcium oxide Limestone (Example 12-17) is replaced, and its changes are set according to Table 2; the amount of anhydrite is 20wt%; the amount of alumina is 5wt%.

[0063] The dosage of calcium oxide is calculated according to the content of calcium oxide in calcium carbonate, that is, 1 part of calcium oxide is equivalent to 1.785 parts of calcium carbonate.

[0064] Example 12-17 The preparation method of calcium sulfoaluminate-calcium oxide full clinker concrete expansion agent is as follows: use a four-stage cyclone preheater kiln (model φ2.8×46m) with a diameter of 2800mm to calcinate raw materials, and use a cal...

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Abstract

The invention discloses calcium sulphoaluminate or calcium sulphoaluminate-calcium oxide full-clinker concrete expanding agents as well as a preparation method thereof and application thereof in improving shrinkage resisting performance of concrete. A material formula of the expanding agents comprises the following components in percentage by weight: 40wt%-90wt% of limestone (calcium carbonate), 5wt%-50wt% of anhydrite and 2wt%-20wt% of alumina; moreover, limestone not lower than 20wt% (20wt%-100wt%) is replaced by calcium oxide (quicklime), and a calculation coefficient of the limestone replaced by the calcium oxide (quicklime) is 1.785 in mixture calculation, i.e., one part of calcium oxide used is equivalent to 1.785 parts of calcium carbonate. According to the invention, rotary-kiln industrial production of calcium sulphoaluminate or calcium sulphoaluminate-calcium oxide full-clinker concrete expanding agents is realized; moreover, expansion performance is improved, manufacturing cost is remarkably lowered, and application prospect is broad.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures for building materials, in particular to a calcium sulfoaluminate or calcium sulfoaluminate-calcium oxide full-clinker concrete expansion agent and a preparation method thereof and its ability to improve concrete resistance to drying shrinkage and temperature shrinkage in the application. Background technique [0002] Cracks caused by shrinkage of concrete are a common quality problem and generally affect the durability of concrete structures. Among them, early cracking of concrete structures caused by drying shrinkage (including self-drying shrinkage) is becoming more and more common. After years of research and practice, people have explored technical ways to reduce the shrinkage of concrete materials from different perspectives such as technology and materials. [0003] Expansion agent is a widely used concrete admixture to resist concrete drying shrinkage and temperature shrinkag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/14C04B28/04C04B28/08
Inventor 赵顺增刘立贾福杰李长成武旭南
Owner CHINA BUILDING MATERIALS ACAD
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