Retarded water-resistant gypsum block and preparation method thereof

A gypsum block and retarding technology, applied in the field of gypsum blocks, can solve problems such as being unfavorable to the construction of gypsum blocks, reducing waterproof performance, increasing equipment, etc., so as to prolong the solidification and hardening time, reduce the waste rate, and prolong the time. Effect

Inactive Publication Date: 2009-12-09
贵州金三利科技建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above production methods only consider the setting time of gypsum to design the production capacity; however, the production capacity of these production methods is low. If the production capacity is expanded, it is necessary to increase equipment or workshops, which requires a large investment.
At present, the problem of waterproofing gypsum blocks is mainly to coat or impregnate hydrophobic substances on the surface of gypsum blocks, but once defects appear on the surface or part of the coated gypsum blocks, the exposed gypsum will Be eroded by water, thus reducing the waterproof performance
Moreover, there are hydrophobic substances on the surface of gypsum blocks, which is not conducive to the construction of gypsum blocks.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A preparation method of gypsum blocks, the process steps are as follows: firstly, 600kg of gypsum powder, 33kg of fly ash, 8.5kg of sodium silicate and aluminum sulfate, weighing 17kg in total, are blended evenly and put into a stirring tank. Dissolve 17kg of sodium lignosulfonate in lignin water reducer in 200kg of water and mix evenly, pour it into the mixing tank, start the mixer at the same time, and stir rapidly for 2 minutes; use the irrigation pump to pour the mixed slurry into the block mold, The initial setting time of the blocks is 80 minutes, and the solidified gypsum blocks are taken out of the mold, and finally the gypsum blocks containing moisture are artificially dried or naturally dried into finished products. In the finished blocks, there are no blocks with more than one missing corner and cracks exceeding 30mm. The average mass of the blocks is 11.7kg, the breaking load is 6.2KN, and the softening coefficient is 0.74.

Embodiment 2

[0017] A preparation method of gypsum block, the process steps are: first, 550kg of gypsum powder, 100kg of blast furnace cinder, sodium fluorosilicate, calcium chloride, 8.5kg of aluminum potassium sulfate and sodium sulfate in total 34kg, blended evenly Put in a mixing jar. Dissolve 3.5 kg of olefin maleate copolymer of polycarboxylic acid-based water reducer in 275 kg of water and mix evenly, pour it into the mixing tank, start the mixer at the same time, and stir rapidly for 2 minutes; use the pouring pump to pour the mixed slurry on the masonry In the block mold, the initial setting time of the block is 110 minutes, and the solidified gypsum block is taken out from the mold, and finally the gypsum block containing moisture is dried manually or naturally to be a finished product. In the finished blocks, there are no blocks with more than one missing corner and cracks exceeding 30mm. The average mass of the blocks is 12.4kg, the breaking load is 6.0KN, and the softening coe...

Embodiment 3

[0019] A preparation method of a gypsum block, the process steps are: first, 570kg of gypsum powder, 103kg of blast furnace cinder, 3.4kg of a mixture of potassium aluminum sulfate and sodium carbonate, 6.8kg in total, are blended evenly and put into a stirring tank. Dissolve 3.4kg of calcium lignosulfonate and 6.8kg of magnesium lignosulfonate in the lignin superplasticizer in 240kg of water and mix evenly, pour it into the mixing tank, start the mixer at the same time, and stir quickly for 2 minutes; use an irrigation pump The mixed slurry is poured into the block mold, the initial setting time of the block is 90 minutes, the solidified gypsum block is taken out from the mold, and finally the gypsum block containing moisture is dried artificially or naturally to obtain a finished product. In the finished blocks, there are no blocks with more than one missing corner and cracks exceeding 30mm. The average mass of the blocks is 11.9kg, the breaking load is 6.5KN, and the softeni...

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Abstract

The invention discloses a retarded water-resistant gypsum block and a preparation method thereof. The retarded water-resistant gypsum block is prepared from the following raw materials in percentage by weight: 80 to 90 percent of powdery gypsum, 5 to 15 percent of fly ash or blast furnace slag, 1 to 5 percent of excitant, and 0.5 to 2.5 percent of water reducing agent, wherein the water-solid ratio is between 0.3 and 0.4. The fineness of the raw materials reaches that an oversize product of a sieve with a size of 0.08 mm is not greater than 5 percent. The raw materials are added into a stirring tank according to the mixture ratio, an irrigation pump is used to pour mixed slurry into a forming die after the raw materials are stirred evenly, and the gypsum block is obtained after the demolding and constant-temperature drying. The gypsum block has retarding and water-resistant characteristics, reduces rejection rate, reduces drying time, and reduces the energy consumption during the drying.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a gypsum block and a preparation method thereof. Background technique [0002] The current gypsum block is made of hemihydrate gypsum as the main raw material, which is mixed with water, poured and molded and dried to form a gypsum block product. The production principle of gypsum blocks is that hemihydrate gypsum reacts with water and is reduced to dihydrate reinforced gypsum. The dihydrate gypsum crystallizes and solidifies in the mold to form gypsum blocks. Gypsum sets and hardens very quickly, its initial setting time is 6-30 minutes, and its operable time is only 5-10 minutes. Due to its short solidification time; on the one hand, it causes solidification in the mixing tank or during the conveying process of the irrigation pump; Corners and too long cracks, the product has a high reject rate. Therefore, can not satisfy the needs of gypsum material molding and constructio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E04C1/00B28C7/04B28C5/00B28B1/14B28B11/24C04B28/14C04B18/08C04B18/14
CPCY02W30/91
Inventor 肖良锦刘建平杜礼昌
Owner 贵州金三利科技建材有限公司
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