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A kind of gypsum-based self-leveling mortar that can realize pumping and preparation method thereof

A self-leveling mortar and gypsum-based technology, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems that building gypsum is easily affected by impurities, low product strength, unstable performance, etc., to achieve improved The effect of drag reduction and sand carrying capacity, stable product performance and reasonable formula

Active Publication Date: 2022-08-09
临海市忠信新型建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the products produced by building gypsum currently have relatively large porosity, and dihydrate gypsum crystals are prone to dissolution and recrystallization in a humid environment, so the product has low strength and poor water resistance, and building gypsum is easily affected by impurities, with unstable performance and fluidity. Poor, in order to improve the performance of gypsum-based self-leveling mortar, it needs to be modified

Method used

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  • A kind of gypsum-based self-leveling mortar that can realize pumping and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) The methyl methacrylate monomer, silica sol and water were mixed and added into the shearing emulsifier at a mass ratio of 1:0.25:20 at room temperature, and emulsified at a high speed at a speed of 11000r / min for 5h , and then left to stand for 8h to obtain a suspension;

[0028] (2) the above-mentioned suspension liquid obtained is heated to 50 ℃, then 10g of strong hydrophilic electrolyte sodium sulfate powder is added, thereby reducing the solubility of methyl methacrylate monomer and condensing out, forming the initial microcapsule, cooling to 10 ℃, the initial microcapsules disappeared, and then the temperature was raised to 50 ℃ again to obtain the shaped microcapsule suspension, and finally centrifuged, and the precipitate obtained by centrifugation was washed to neutrality and dried to obtain modified organic microcapsules ;

[0029] (3) In parts by weight, combine 535 parts of β-hemihydrate gypsum, 215 parts of α-hemihydrate gypsum, 5 parts of CA50 white ...

Embodiment 2

[0031] (1) The methyl methacrylate monomer, silica sol and water were mixed and added into the shearing emulsifier at a mass ratio of 1:0.25:20 at room temperature, and emulsified at a high speed at a speed of 11000r / min for 5h , and then left to stand for 8h to obtain a suspension;

[0032] (2) the suspension obtained above was heated to 50°C, then 10g of strong hydrophilic electrolyte sodium sulfate powder was added to form primary microcapsules, the temperature was lowered to 10°C, and the primary microcapsules disappeared, and then the temperature was raised to 50°C again to prepare The shaped microcapsule suspension is obtained, and finally centrifugation is performed, and the precipitate obtained by centrifugation is washed to neutrality and dried to obtain modified organic microcapsules;

[0033] (3) In parts by weight, 400 parts of β-hemihydrate gypsum, 160 parts of α-hemihydrate gypsum, 1 part of CA-50 white aluminate cement, 210 parts of machine-made sand, 210 parts ...

Embodiment 3

[0035] (1) The methyl methacrylate monomer, silica sol and water were mixed and added into the shearing emulsifier at a mass ratio of 1:0.25:20 at room temperature, and emulsified at a high speed at a speed of 11000r / min for 5h , and then left to stand for 8h to obtain a suspension;

[0036] (2) the above-mentioned suspension liquid obtained is heated to 50 ℃, then 10g of strong hydrophilic electrolyte sodium sulfate powder is added, thereby reducing the solubility of methyl methacrylate monomer and condensing out, forming the initial microcapsule, cooling to 10 ℃, the initial microcapsules disappeared, and then the temperature was raised to 50 ℃ again to obtain the shaped microcapsule suspension, and finally centrifuged, and the precipitate obtained by centrifugation was washed to neutrality and dried to obtain modified organic microcapsules ;

[0037] (3) In parts by weight, 535 parts of β-hemihydrate gypsum, 215 parts of α-hemihydrate gypsum, 1 part of 42.5 grade white ord...

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Abstract

The invention discloses a gypsum-based self-leveling mortar that can be pumped. In parts by weight, it comprises the following components: 400-750 parts of hemihydrate gypsum; 1-15 parts of cement; 420-550 parts of aggregate; 10-40 parts of fly ash; 0.01-10 parts of polycarboxylate water reducing agent; 0.05-0.5 parts of dispersant; 0.5-2.5 parts of retarder; 0.5-5 parts of modified organic microcapsules; 250-300 parts of water. The invention also discloses a preparation method of the gypsum-based self-leveling mortar. The mortar provided by the invention does not soak in water, has good fluidity, and can be pumped; the invention also adds organic microcapsules modified by silica sol to the matrix, which effectively improves the drag-reducing and sand-carrying ability of the freshly mixed slurry and reduces blockage. tube phenomenon occurs.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a pumpable gypsum-based self-leveling mortar and a preparation method thereof. Background technique [0002] Self-leveling mortar is a special kind of mortar. It is composed of cementitious materials, aggregates and chemical admixtures. It has good fluidity and stability, low labor intensity, high early strength and fast construction speed. It is widely used in various large-scale fields, such as schools, hospitals, Ground leveling construction for factories, shops, apartments, office buildings, etc. Self-leveling mortar can be divided into cement-based and gypsum-based two types according to different cementitious materials. Gypsum-based self-leveling mortar is a kind of dry mortar specially used for ground leveling, elevation and floor heating backfill, which is prepared and uniformly mixed with special aggregates and various construction chemical additives in the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/14C04B40/00C04B24/26C04B20/10C04B24/18C04B14/06C04B111/62C04B103/40
CPCC04B28/147C04B40/0028C04B40/0039C04B20/1033C04B2111/62C04B2111/00146C04B2201/50C04B2103/408C04B11/032C04B7/32C04B14/06C04B14/068C04B18/08C04B2103/302C04B24/14C04B14/062C04B7/02C04B24/18C04B24/2664Y02W30/91
Inventor 范树景李超何广朋
Owner 临海市忠信新型建材有限公司
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