Modified gypsum base screed and preparation and application thereof

A mortar and gypsum technology, applied in the field of modified gypsum-based floor mortar and its preparation and application, can solve the problems of large shrinkage, poor bonding performance, increased maintenance costs in the later period, etc., to improve strength, reduce material usage, resist The effect of hollow drum cracking performance is good

Inactive Publication Date: 2016-04-13
上海每天生态科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ordinary cement mortar is prone to hollowing and cracking due to large shrinkage and poor bonding performance, which increases maintenance costs in the later period

Method used

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  • Modified gypsum base screed and preparation and application thereof
  • Modified gypsum base screed and preparation and application thereof
  • Modified gypsum base screed and preparation and application thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0072] The preparation method of building gypsum in Example 1-4 is: phosphogypsum is pre-mixed with desulfurized gypsum at a mass ratio of 1:1 after being properly pretreated to neutrality (pH≈7), and the tail steam generated by the power plant generates gypsum at 75 After drying at ℃, calcining at 150℃ for 2 hours; then grinding to 200 mesh; aging for 7 days after cooling.

[0073] The production method and test method of the test piece in the embodiment are carried out in accordance with the relevant regulations of GBT17671-1999 cement mortar strength test method (ISO method), wherein the test piece is mixed with a modified gypsum-based floor mortar and an appropriate amount of water to form a certain fluidity. The plastic sand with high density can be molded, and the shrinkage rate is carried out in accordance with the relevant regulations of the building materials industry standard JC / T985-2005 cement-based self-leveling mortar for the ground.

Embodiment 1

[0075] The main ingredients of the modified gypsum-based floor mortar are: 30% building gypsum, 5% slag powder, 5% cement, and 60% medium sand;

[0076] The building admixture and its percentage per thousand to the mass of the main material are: retarder 1‰, water reducing agent 0.2‰;

[0077] The ratio of water to material is 0.29;

[0078] The performance is as follows:

[0079]

[0080]

Embodiment 2

[0082] The main ingredients of the modified gypsum base mortar are: 33% building gypsum, 5% slag powder, 5% cement, 2% steel slag powder, medium sand, 55%;

[0083] The building admixture and its percentage per thousand to the mass of the main material are: retarder 0.9‰;

[0084] The ratio of water to material is 0.31;

[0085] The performance is as follows:

[0086]

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Abstract

The invention discloses modified gypsum base screed and preparation and application thereof. The screed can be used for ground leveling and decorating and is prepared from modified gypsum, sand and an appropriate quantity of building additives. By means of the method of adding an appropriate amount of steel slag fine powder, slag powder and other inorganic materials and relative additives, the water consumption for modified gypsum is lowered, the density of the material is improved, the good adhesion performance of the gypsum base material is kept, the water resistance and mechanical property of the material are improved, the quality problem that a cement terrace coating material is prone to cracking can be effectively solved, and cost performance is more excellent. Waste such as gypsum, ardealite, ground steel slag and slag powder of a power plant is fully used for preparing a gel material, waste resources are comprehensively reused, environment pollution can be easily reduced, and meanwhile good economic benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of mortar, and relates to a modified gypsum-based floor mortar and its preparation and application. Background technique [0002] Gypsum has the advantages of wide sources and stable performance. However, due to its crystal structure, gypsum products have a loose and porous structure and a high water absorption rate, so water resistance is poor. Generally, the saturated strength is only about 1 / 3 of the dry strength. Therefore, most of the gypsum is used to produce gypsum boards, gypsum blocks, plaster plaster, etc., and because the gypsum material is brittle, it is easy to break during transportation and installation, which also limits its use. Another important use of gypsum is as a retarder in cement production, which can adjust the setting time of cement. [0003] In 2013, the production of gypsum, an industrial by-product in my country, reached 184 million tons, including 75.5 million tons of gypsum an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B22/14C04B18/14
CPCC04B18/142C04B22/143C04B28/04C04B18/12C04B14/06C04B2103/22C04B2103/302C04B2103/50C04B24/383C04B24/24Y02W30/91
Inventor 李涛方爱华程云
Owner 上海每天生态科技发展有限公司
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