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Sand-free gypsum-based self-leveling mortar and preparation method thereof

A self-leveling mortar and gypsum-based technology, which is applied in the field of building materials, can solve the problems of production line explosion, dust generation, production interruption, etc., and achieve the effect of reducing mining, reducing consumption, and reducing material costs

Active Publication Date: 2022-03-11
BBMG MORTAR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the extracted stone powder is not processed and consumed in time, the entire production line will "explode" and production will be interrupted
If the stone powder is piled up outside the warehouse, it is very easy to generate dust and pollute the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1. Weigh the following raw materials: 700g of desulfurized building gypsum powder, 300g of stone powder, 1.0g of cellulose ether, 0.5g of polyvinyl alcohol, 0.4g of silicone defoamer, 2.5g of polycarboxylate superplasticizer, retarder Dose 0.4g.

[0040] 2. Mix the above powder evenly and set aside;

[0041]3. Weigh 430g of water and add it to the stirring pot for later use.

[0042] 4. Add the powder in step 2 into the liquid in step 3, and stir with a mortar mixer at a low speed for 180 seconds to prepare a sand-free gypsum-based self-leveling mortar.

[0043] According to the JC / T 1023-2021 gypsum-based self-leveling mortar standard test, the performance index of the material is 142mm, 30min fluidity loss 2mm, 24h flexural strength 2.8MPa, 24h compressive strength 8.5MPa, The 28d absolute dry flexural strength is 6.7MPa, the 28d absolute dry compressive strength is 21.5MPa, the absolute dry tensile bond strength is 1.2MPa, and the dry shrinkage rate is 0.02%.

Embodiment 2

[0045] 1. Weigh the following raw materials: 750g desulfurized building gypsum powder, 210g stone powder, 40g cement, 0.9g cellulose ether, 0.5g polyvinyl alcohol, 0.6g silicone defoamer, 2.5g polycarboxylate water reducer , retarder 0.5g.

[0046] 2. Mix the above powder evenly and set aside;

[0047] 3. Weigh 460g of water and add it to the stirring pot for later use.

[0048] 4. Add the powder in step 2 into the liquid in step 3, and stir with a mortar mixer at a low speed for 180 seconds to prepare a sand-free gypsum-based self-leveling mortar.

[0049] According to the JC / T 1023-2021 gypsum-based self-leveling mortar standard test, the performance index of the material is 145mm fluidity, 30min fluidity loss 3mm, 24h flexural strength 2.9MPa, 24h compressive strength 9.1MPa, The 28d absolute dry flexural strength is 7.5MPa, the 28d absolute dry compressive strength is 23.6MPa, the absolute dry tensile bond strength is 1.1MPa, and the dry shrinkage rate is 0.04%.

Embodiment 3

[0051] 1. Weigh the following raw materials: 650g of desulfurized building gypsum powder, 350g of stone powder, 1.1g of cellulose ether, 0.5g of polyvinyl alcohol, 0.3g of silicone defoamer, 3.0g of polycarboxylate superplasticizer, retarder Dose 0.4g.

[0052] 2. Mix the above powder evenly and set aside;

[0053] 3. Weigh 410g of water and add it to the stirring pot for later use.

[0054] 4. Add the powder in step 2 to the liquid in step 3, and mix it with a mortar mixer at a low speed for 180 seconds to prepare a sand-free gypsum base leveling mortar.

[0055] According to the JC / T 1023-2021 gypsum-based self-leveling mortar standard test, the performance index of the material is that the fluidity is 140mm, the fluidity loss is 1mm in 30min, the flexural strength is 2.1MPa in 24h, and the compressive strength in 24h is 7.0MPa. The 28d absolute dry flexural strength is 6.5MPa, the 28d absolute dry compressive strength is 20.5MPa, the absolute dry tensile bond strength is ...

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Abstract

The invention discloses sand-free gypsum-based self-leveling mortar which comprises the following components in parts by weight: 65-75 parts of beta-type desulfurized building gypsum; 25 to 35 parts of stone powder; 0-4 parts of cement; 0.05 to 0.15 part of a water retention thickening agent; 0.15 to 0.35 part of a water reducing agent; 0.04 to 0.1 part of a retarder; 0.04 to 0.08 part of a defoaming agent; 0.04 to 0.1 part of a binder; and 40 to 50 parts of water. Wherein the beta-type desulfurized building gypsum is prepared by calcining flue gas desulfurization gypsum of a thermal power plant, the content of beta-type calcium sulfate hemihydrate in the beta-type desulfurized building gypsum is not less than 92% by mass, the 2h breaking strength of the beta-type desulfurized building gypsum is not less than 3.5 MPa, and the standard consistency water consumption is not more than 58%. The stone powder is collected in the process of preparing machine-made sand from limestone, the 200-mesh sieve residue of the stone powder is less than 5% by mass percent, and the 20-mesh sieve residue is 0 by mass percent.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a sandless gypsum-based self-leveling mortar and a preparation method thereof. Background technique [0002] At present, the indoor ground materials of ordinary civil buildings mainly include fine stone concrete and ceramsite concrete. The use of ceramsite concrete needs to consume more ceramsite. As the lightweight aggregate of ceramsite concrete, ceramsite needs to be calcined during preparation, and the energy consumption is high. Due to its high density, fine stone concrete will increase the weight of the building, and the thermal insulation and sound insulation effects are not good. In addition, the above two materials require manual smoothing and finishing during construction, which requires a high level of construction technology for workers. Improper operation will easily cause a series of quality problems such as sanding, cracking, and large deviations in fla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14C04B14/02
CPCC04B28/147C04B14/02C04B2201/50C04B2111/00017C04B2201/20C04B7/00C04B2103/465C04B2103/44C04B2103/302C04B2103/22C04B2103/50Y02W30/91
Inventor 李志博蔡鲁宏田胜力章银祥吴金明
Owner BBMG MORTAR CO LTD
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