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A kind of superfine retarded calcium aluminate cement and preparation method thereof

A technology for retarding setting calcium aluminate and calcium aluminate cement, which is applied in the field of aluminate cement for refractory materials, and achieves the effects of prolonging the demoulding time, prolonging the working time and reducing the addition amount

Active Publication Date: 2017-03-29
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, it is of great significance to study the influence of cement particle size on the hydration and setting characteristics of calcium aluminate cement. However, there are few reports on the influence of cement particle size on the hydration and setting characteristics of calcium aluminate cement.

Method used

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  • A kind of superfine retarded calcium aluminate cement and preparation method thereof
  • A kind of superfine retarded calcium aluminate cement and preparation method thereof
  • A kind of superfine retarded calcium aluminate cement and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Prepare the clean slurry of unmilled calcium aluminate cement and ultrafine calcium aluminate cement after ball milling, and test its hydration exotherm curve, see figure 1 . With the reduction of cement particle size, that is, D50 decreases from 12.39 μm to 1.36 μm, the time for the cement paste to release heat at 20°C is delayed from 7h to 14h, and the time for the peak of hydration heat to appear is delayed from 11.7h to 24.7h h.

Embodiment 2

[0028] Prepare mortars of unmilled calcium aluminate cement and ultrafine calcium aluminate cement after ball milling, and test their hydration exothermic curves (see figure 2 ) and its coagulation time. With the decrease of cement particle size, that is, D50 decreases from 12.39 μm to 1.36 μm, the time for cement mortar to release heat at 20°C is delayed from 2.5h to 4h, and the time for hydration heat release peak is delayed from 5.7h to 13.8h h, the initial setting time of mortar is delayed from 3h 35min to 6h 35min, and the final setting time is delayed from 3h 55min to 7h 25min.

Embodiment 3

[0030] Prepare unmilled calcium aluminate cement, ultrafine calcium aluminate cement after ball milling, and 40% RG4000 Al 2 o 3 After mixing the fine powder, and test its hydration exothermic curve, see image 3. With the decrease of cement particle size, that is, D50 decreases from 12.39 μm to 1.36 μm, at 20°C, the time for cement paste to release heat is delayed from 4.8h to 8.5h, and the time for hydration heat release peak is delayed from 7.1h to 12.2h.

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Abstract

The invention discloses superfine retarded calcium aluminate cement. The specific surface area of the cement is 5510-5540 cm<2> / g, D50 is 1.28-1.45 mu m, D90 is 1.97-2.13 mu m, the maximum particle size is 9.46-10.03 mu m, and the minimum particle size is 0.58-0.76 mu m. According to the invention, studies on the hydration behavior of the superfine calcium aluminate cement show that the times that paste and mortar of the superfine cement begin to release heat and the time that the peak value of hydration heat evolution occurs are all delayed, and the setting time of the mortar is prolonged, i.e. the decrease of the cement particle size has a delay effect on cement hydration, so that the setting of the cement is delayed. Therefore, the superfine retarded calcium aluminate cement can prolong the operable time and stripping time of a combining castable thereof, and in some occasions required to be subjected to long-term construction operation, a longer operable time of the castable can be kept.

Description

technical field [0001] The invention belongs to the field of aluminate cement for refractory materials, and in particular relates to an ultrafine slow-setting calcium aluminate cement and a preparation method thereof. Background technique [0002] Calcium aluminate cement (CAC) is a commonly used hydration binder for monolithic refractories. In modern high-performance castables, although the amount of cement added is gradually decreasing, calcium aluminate cement is still a fairly common hydration binder in refractory castables, mainly because it has excellent solidification characteristics, which can ensure It is also the most important role of CAC in castables to provide sufficient demoulding strength under the premise of fluidity of castables. This role is closely related to the hydration process of CAC, and the hydration of cement in castables will also It affects the working time and demoulding time of the castable, and then affects the construction progress of the cas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/32
Inventor 叶国田王亚娟尚学军朱玲玲
Owner ZHENGZHOU UNIV
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