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High-strength gypsum retarder and preparation method thereof

A high-strength gypsum and retarder technology, which is applied in the field of high-strength gypsum retarders, can solve the problems that retarders have little research on the hydration process of gypsum, and achieve low cost, high-efficiency retarder effect, and enhanced retarder effect Effect

Inactive Publication Date: 2015-06-24
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the problem of the strength loss of gypsum caused by retarders has not been reasonably explained and effectively resolved, and there are few studies on the mechanism of influence of retarders on the hydration process and microstructure of gypsum.

Method used

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  • High-strength gypsum retarder and preparation method thereof
  • High-strength gypsum retarder and preparation method thereof
  • High-strength gypsum retarder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The specific implementation steps are attached figure 1 As shown, weigh 338g of barium carbonate and 87.41g of silicon dioxide at a molar ratio of 2:1, mix them evenly, put them into a ball mill to grind them for 1 hour, dry them in an oven at (45±5)°C, and put them into a high-temperature electric furnace at 1200°C Internally calcined for 3 hours, took out and sieved to obtain 200g of dibarium silicate retarder. Different dosages of retarders were selected, and the setting time and strength properties were tested under the standard consistency of water consumption. At the same time, the high-strength gypsum without retarder was used as a comparison.

[0023]

[0024] as attached figure 2 As shown, it can be seen that the setting time increases with the increase of retarder content, but the change of setting time is no longer obvious after 8%. After adding a single dibarium silicate retarder, the strength loss of gypsum is smaller than that of a single barium carb...

Embodiment 2

[0026] Select 8% retarder as a benchmark, adjust the weight ratio of barium carbonate and dibarium silicate, and compare the setting time and strength performance test:

[0027]

[0028]

[0029] Adding dibarium silicate to a retarder with a large specificity has a small strength loss and a long retarding time. attached by image 3 It can be seen that the exothermic heat of dibarium silicate at the same dosage is smaller than that of barium silicate, so it has a better retarding effect.

[0030] It can be seen from the above examples that the retarder can effectively prolong the setting time of high-strength gypsum, and the strength loss of hardened gypsum is small.

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Abstract

The invention relates to a high-strength gypsum retarder and a preparation method thereof. The gypsum retarder is obtained by mixing barium carbonate and / or dibarium silicate, wherein dibarium silicate is obtained by mixing and calcining barium carbonate and silicon dioxide. According to the mechanism that the Ba<2+> and calcium sulfate in the gypsum are reacted to generate water insoluble barium sulfate, and barium sulfate is wrapped on the surface of the gypsum granule and the solution rate of the gypsum is reduced, so that the retarder has the functions of inhibiting the gypsum hydration and prolonging the gypsum setting time. The retarding effect of dibarium silicate is better than that of barium carbonate under the same adulterate amount and the strength descent of the gypsum caused by a common retarder is simultaneously reduced.

Description

technical field [0001] The invention relates to a high-strength gypsum retarder, belonging to the technical field of preparation of gypsum retarders. Background technique [0002] After the high-strength gypsum is mixed with water, the initial setting and final setting time of the slurry are very short. Generally, the initial setting time is several minutes to ten minutes, the final setting time is within half an hour, and it is completely hardened in about a week. Its initial setting time is relatively short, and it will lose its fluidity within a few minutes after adding water and stirring, and its operable time is only 5-10 minutes, which often cannot meet the needs of gypsum-based material molding, which is very unfavorable in the construction process, so for An admixture for this feature of gypsum products - retarder came into being. [0003] Selecting the appropriate retarder and its dosage is an important means to realize a wide range of adjustment of the setting ti...

Claims

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Application Information

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IPC IPC(8): C04B22/10
Inventor 高建明王楚妍唐永波
Owner SOUTHEAST UNIV
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