CN111484300B

CN111484300B - Special gypsum mortar for screeding and preparation method thereof

Info

Publication number: CN111484300B
Application number: CN202010303475.3A
Authority: CN
Inventors: 孔凡奇; 蔡光艳; 吴流宪; 钱腾
Original assignee: Guizhou Zhongneng High New Material Co ltd
Current assignee: Guizhou Zhongneng High New Material Co ltd
Priority date: 2020-04-17
Filing date: 2020-04-17
Publication date: 2022-04-15
Anticipated expiration: 2040-04-17
Also published as: CN111484300A

Abstract

The invention relates to the technical field of building materials, in particular to gypsum mortar special for screeding and a preparation method thereof, wherein the mortar comprises the following components: sulphoaluminate cement, fluoroaluminate cement, gypsum, periclase, shrimp shell powder, nano calcium carbonate, attapulgite ultrafine powder, river sand, talcum powder, calcium lignosulphonate, alkyl diethanolamide, chrysotile, sodium dodecyl sulfate and sodium carbonate; the invention is beneficial to the network structure optimization of the mortar mixture, strengthens the strength of the whole mortar and promotes the coagulation of the mortar through the multilayer adsorption of the electrostatic attraction, the hydrophobic interaction, the van der waals force and the like of the shrimp shells.

Description

Special gypsum mortar for screeding and preparation method thereof

Technical Field

The invention relates to the technical field of building materials, in particular to gypsum mortar special for screeding and a preparation method thereof.

Background

In the existing building decoration engineering, the plastering construction process generally comprises the steps of firstly making a standard plaster cake above each corner of a wall and drawing a line according to the thickness requirement of wall plastering before plastering, additionally making plaster cakes at windows and buttress corners, and then making a standard plaster cake at the lower corner of the wall. And then, punching the ribs one by one at intervals of about 1-1.5m in a large room (a mortar belt is made between an upper mortar cake and a lower mortar cake by a hammer hanging line), wherein the height of the mortar belt is the same as that of the mortar cakes, and finally, plastering is carried out between the punching ribs and the height of the punching ribs is leveled. When the internal and external corners are squared, the base line is made at the internal and external corners, the square ruler is used to square the internal and external corners, then plastering alignment lines are popped up at the wall corners and the ceiling, and ash cakes and screeds are made at the upper and lower ends of the alignment lines. The precision of one line is controlled by the ash cake, the precision of one line is controlled by the rib punching, and the precision of the whole surface is controlled by a plurality of lines.

In the process, plastering mortar (the components and the weight ratio of the common plastering mortar are generally 20-35 percent of common Portland cement, 0-5 percent of hydrated lime and 60-75 percent of limestone sand) is generally used as the mortar for reinforcement washing, and the mortar has the specific gravity of 1700-1800Kg/m3, and the phenomenon of mortar falling is frequently caused due to the large self weight and the insufficient bonding strength. If the mortar is adopted for mechanical construction, the mortar machine is easy to block a pump, a pipe and a gun in the construction process, the mechanical construction is hindered, the construction efficiency is low, and the next working procedure is influenced due to slow drying and insufficient strength.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides gypsum mortar special for screeding and a preparation method thereof, which are used for improving the strength of the mortar and promoting the solidification of the mortar, wherein the mortar comprises the following components in percentage by mass:

25-30 parts of sulphoaluminate cement, 5-8 parts of fluoroaluminate cement, 10-20 parts of gypsum, 1.5-3 parts of periclase, 5-10 parts of shrimp shell powder, 0.2-0.5 part of nano calcium carbonate, 1-3 parts of attapulgite ultrafine powder, 40-45 parts of river sand, 10-15 parts of talcum powder, 0.2-0.5 part of calcium lignosulfonate, 0.05-0.2 part of alkyl diethanolamide, 0.2-0.3 part of chrysotile, 0.05-0.08 part of sodium dodecyl sulfate and 0.05-0.1 part of sodium carbonate.

Preferably, the gypsum mortar special for screeding consists of the following components in percentage by mass: 29 parts of sulphoaluminate cement, 7 parts of fluoroaluminate cement, 19 parts of gypsum, 1.8 parts of periclase, 6 parts of shrimp shell powder, 0.4 part of nano calcium carbonate, 2 parts of attapulgite ultrafine powder, 45 parts of river sand, 10 parts of talcum powder, 0.5 part of calcium lignosulfonate, 0.1 part of alkyl diethanolamide, 0.25 part of chrysotile, 0.06 part of sodium dodecyl sulfate and 0.08 part of sodium carbonate.

Preferably, the magnesium oxide content of the sulphoaluminate cement is less than 5%, and the strength grade is 62.5.

Preferably, the apparent density of the river sand is 1100kg/m³The mud content is less than 0.01 percent, and the water content is less than 0.01 percent.

Preferably, the periclase is calcined at the high temperature of 500-800 ℃ for 3-5 days and then cooled and processed into the periclase with the fineness of 200-300 meshes.

Preferably, the method for preparing the shrimp shell powder comprises the following steps: mixing the collected shrimp shells with 0.1% sodium bicarbonate solution according to the mass ratio of 1:7, cooking for 2-5h at 100-200 ℃, stirring for 30-50min, filtering, drying the filter residue at 200-250 ℃ until the water content is 3-5%, crushing the filter residue into 80-100 mesh powder, soaking the powder in 1-3% dioctyl sodium sulfosuccinate solution with the mass of 5-8 times of that of the powder and the temperature of 50-80 ℃ for 3-5h, filtering and drying.

The preparation method of the gypsum mortar special for screeding comprises the following steps: mixing sulphoaluminate cement, fluoroaluminate cement, gypsum, periclase, shrimp shell powder, nano calcium carbonate, attapulgite ultrafine powder, river sand, talcum powder, calcium lignosulphonate, alkyl diethanolamide, chrysotile, sodium dodecyl sulfate and sodium carbonate uniformly, adding 50-70 parts of water, and stirring uniformly. .

Compared with the prior art, the invention has the technical effects that:

the shrimp shells used in the invention are treated, so that the impurities such as protein, fat and the like in the shrimp shells are effectively removed, the purity of chitin in the shrimp shells is ensured, and the high adsorbability of the chitin is utilized to promote the cementation of mortar materials; through ionic bonds and hydrogen bonds of chitin molecules, metal ions in the raw materials are combined, so that the function of an intermediate bridge is achieved, and raw material particles are connected together to form a net structure to be precipitated; when the chain-shaped macromolecules with positive charges in the mortar are close to the colloidal particles, the shrimp shells can neutralize partial charges on the surfaces of the shrimp shells, so that the colloidal particles are destabilized and collide with each other to precipitate, and the microstructure of the mortar is optimized; the chitin is beneficial to ion exchange reaction adsorption of ions in the mortar through multilayer adsorption of electrostatic attraction, hydrophobic interaction, van der waals force and the like, the dispersion and activation of calcium lignosulfonate, alkyl diethanolamide and sodium dodecyl sulfate on other components are promoted, the network structure of a mixture of sulphoaluminate cement, fluoroaluminate cement, gypsum, periclase, shrimp shell powder, nano calcium carbonate, attapulgite ultrafine powder, river sand, talcum powder and chrysotile is effectively optimized, the strength of the whole mortar is enhanced, and the coagulation of the mortar is promoted.

The method specially modifies the periclase by high-temperature treatment aiming at the characteristics of the periclase, so that the adsorbability of the periclase surface material is increased, the structure richness of the periclase surface is improved, and the bonding efficiency of the periclase to various materials is further enhanced; the compactness of the internal gaps of the mortar is promoted through the hydration expansion of the periclase during the stirring, and the cementation quality of the mortar is enhanced.

Drawings

FIG. 128 d is a compressive strength line graph;

FIG. 228 d is a plot of bond strength.

Detailed Description

The technical solution of the present invention is further defined below with reference to the specific embodiments, but the scope of the claims is not limited to the description.

Example 1

The special gypsum mortar for screeding comprises the following components in percentage by mass:

29 parts of sulphoaluminate cement, 7 parts of fluoroaluminate cement, 19 parts of gypsum, 1.8 parts of periclase, 6 parts of shrimp shell powder, 0.4 part of nano calcium carbonate, 2 parts of attapulgite ultrafine powder, 45 parts of river sand, 10 parts of talcum powder, 0.5 part of calcium lignosulfonate, 0.1 part of alkyl diethanolamide, 0.25 part of chrysotile, 0.06 part of sodium dodecyl sulfate and 0.08 part of sodium carbonate; calcining the periclase at the high temperature of 800 ℃ for 3 days, and cooling and processing the calcined periclase into periclase powder with the fineness of 200 meshes; the preparation method of the shrimp shell powder comprises the following steps: mixing the collected shrimp shells with 0.1% sodium bicarbonate solution according to the mass ratio of 1:7, cooking for 3h at 170 ℃, stirring for 40min, filtering, drying the filter residue at 230 ℃ until the water content is 4%, crushing the filter residue into 100-mesh powder, soaking the powder in a solution which is 5 times of the mass of the powder and is 3% of sodium dioctyl sulfosuccinate at 80 ℃ for 3h, filtering and drying.

The preparation method of the gypsum mortar special for screeding in the embodiment comprises the following steps: mixing sulphoaluminate cement, fluoroaluminate cement, gypsum, periclase, shrimp shell powder, nano calcium carbonate, attapulgite ultrafine powder, river sand, talcum powder, calcium lignosulphonate, alkyl diethanolamide, chrysotile, sodium dodecyl sulfate and sodium carbonate uniformly, adding 50 parts of water, and stirring uniformly.

Example 2

30 parts of sulphoaluminate cement, 8 parts of fluoroaluminate cement, 20 parts of gypsum, 3 parts of periclase, 10 parts of shrimp shell powder, 0.5 part of nano calcium carbonate, 3 parts of attapulgite ultrafine powder, 45 parts of river sand, 15 parts of talcum powder, 0.5 part of calcium lignosulfonate, 0.2 part of alkyl diethanolamide, 0.3 part of chrysotile, 0.08 part of sodium dodecyl sulfate and 0.1 part of sodium carbonate. Calcining the periclase at the high temperature of 800 ℃ for 5 days, and cooling and processing the calcined periclase into periclase powder with the fineness of 300 meshes; the preparation method of the shrimp shell powder comprises the following steps: mixing the collected shrimp shells with 0.1% sodium bicarbonate solution in a mass ratio of 1:7, cooking for 5h at 200 ℃, stirring for 50min, filtering, drying the filter residue at 250 ℃ until the water content is 5%, crushing the filter residue into 100-mesh powder, soaking the powder in a solution which is 8 times of the mass of the powder and is 3% of dioctyl sodium sulfosuccinate at 80 ℃ for 5h, filtering and drying.

The preparation method of the gypsum mortar special for screeding in the embodiment comprises the following steps: mixing sulphoaluminate cement, fluoroaluminate cement, gypsum, periclase, shrimp shell powder, nano calcium carbonate, attapulgite ultrafine powder, river sand, talcum powder, calcium lignosulphonate, alkyl diethanolamide, chrysotile, sodium dodecyl sulfate and sodium carbonate uniformly, adding 70 parts of water, and stirring uniformly.

Example 3

25 parts of sulphoaluminate cement, 5 parts of fluoroaluminate cement, 10 parts of gypsum, 1.5 parts of periclase, 5 parts of shrimp shell powder, 0.2 part of nano calcium carbonate, 1 part of attapulgite ultrafine powder, 40 parts of river sand, 10 parts of talcum powder, 0.2 part of calcium lignosulfonate, 0.05 part of alkyl diethanolamide, 0.2 part of chrysotile, 0.05 part of sodium dodecyl sulfate and 0.05 part of sodium carbonate; calcining the periclase at a high temperature of 500 ℃ for 3 days, and cooling and processing the calcined periclase into periclase powder with the fineness of 300 meshes; the preparation method of the shrimp shell powder comprises the following steps: mixing the collected shrimp shells with 0.1% sodium bicarbonate solution according to the mass ratio of 1:7, cooking for 2h at 200 ℃, stirring for 30min, filtering, drying the filter residues at 200 ℃ until the water content is 3%, crushing the filter residues into 80-mesh powder, soaking the powder in a solution which is 8 times of the mass of the powder and is 3% of sodium dioctyl sulfosuccinate at 80 ℃ for 5h, filtering and drying.

The preparation method of the gypsum mortar special for screeding in the embodiment comprises the following steps: mixing sulphoaluminate cement, fluoroaluminate cement, gypsum, periclase, shrimp shell powder, nano calcium carbonate, attapulgite ultrafine powder, river sand, talcum powder, calcium lignosulphonate, alkyl diethanolamide, chrysotile, sodium dodecyl sulfate and sodium carbonate uniformly, adding 66 parts of water, and stirring uniformly.

Comparative example setup:

test examples

Mortars were prepared as per groups 1-3 of examples, designated as groups a1-a 3; and respectively preparing the mortar according to the groups of comparative examples 1 to 4, marking as the groups b1 to b4, testing the compressive strength of 28d according to the national standard GB/T20473-2006 and testing the bonding strength of 28d according to the industrial standard SJG 11-2004.

And (3) test results:

as shown in FIG. 1, it can be seen that the compressive strength of the groups a1-a3 is obviously higher than that of the groups b1-b4, so the method of the invention has obvious improvement on the strength of the mortar.

As shown in FIG. 2, the bonding strength of groups a1-a3 is obviously higher than that of groups b1-b4, so the method has obvious effect on improving the mortar structure.

Claims

1. The gypsum mortar special for screeding is characterized by comprising the following components in percentage by mass:

25-30 parts of sulphoaluminate cement, 5-8 parts of fluoroaluminate cement, 10-20 parts of gypsum, 1.5-3 parts of periclase, 5-10 parts of shrimp shell powder, 0.2-0.5 part of nano calcium carbonate, 1-3 parts of attapulgite ultrafine powder, 40-45 parts of river sand, 10-15 parts of talcum powder, 0.2-0.5 part of calcium lignosulfonate, 0.05-0.2 part of alkyl diethanolamide, 0.2-0.3 part of chrysotile, 0.05-0.08 part of sodium dodecyl sulfate and 0.05-0.1 part of sodium carbonate; calcining the periclase at the high temperature of 800 ℃ for 3-5 days under the temperature of 500-;

the preparation method of the shrimp shell powder comprises the following steps: mixing the collected shrimp shells with 0.1% sodium bicarbonate solution according to the mass ratio of 1:7, cooking for 2-5h at 100-200 ℃, stirring for 30-50min, filtering, drying the filter residue at 200-250 ℃ until the water content is 3-5%, crushing the filter residue into 80-100 mesh powder, soaking the powder in 1-3% dioctyl sodium sulfosuccinate solution with the mass of 5-8 times of that of the powder and the temperature of 50-80 ℃ for 3-5h, filtering and drying.

2. The gypsum mortar special for screeding according to claim 1, which is characterized by comprising the following components in percentage by mass: 29 parts of sulphoaluminate cement, 7 parts of fluoroaluminate cement, 19 parts of gypsum, 1.8 parts of periclase, 6 parts of shrimp shell powder, 0.4 part of nano calcium carbonate, 2 parts of attapulgite ultrafine powder, 45 parts of river sand, 10 parts of talcum powder, 0.5 part of calcium lignosulfonate, 0.1 part of alkyl diethanolamide, 0.25 part of chrysotile, 0.06 part of sodium dodecyl sulfate and 0.08 part of sodium carbonate.

3. The gypsum mortar special for screeding according to claim 1, wherein the magnesium oxide content of the sulphoaluminate cement is less than 5%, and the strength grade is 62.5.

4. The gypsum mortar special for screeding according to claim 1, wherein the river sand has an apparent density of 1100kg/m3, a mud content of less than 0.01% and a water content of less than 0.01%.

5. The gypsum mortar special for screeding according to claim 1, wherein the preparation method comprises the following steps: mixing sulphoaluminate cement, fluoroaluminate cement, gypsum, periclase, shrimp shell powder, nano calcium carbonate, attapulgite ultrafine powder, river sand, talcum powder, calcium lignosulphonate, alkyl diethanolamide, chrysotile, sodium dodecyl sulfate and sodium carbonate uniformly, adding 50-70 parts of water, and stirring uniformly.