CN111393125B - Gypsum-based self-leveling repair mortar and preparation method thereof - Google Patents
Gypsum-based self-leveling repair mortar and preparation method thereof Download PDFInfo
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- CN111393125B CN111393125B CN202010220434.8A CN202010220434A CN111393125B CN 111393125 B CN111393125 B CN 111393125B CN 202010220434 A CN202010220434 A CN 202010220434A CN 111393125 B CN111393125 B CN 111393125B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
- C04B28/142—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/144—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being a flue gas desulfurization product
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/72—Repairing or restoring existing buildings or building materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The invention provides gypsum-based self-leveling repair mortar and a preparation method thereof, wherein the repair mortar comprises the following components in parts by weight: 40-60 parts of building gypsum, 40-60 parts of quartz sand, 0-10 parts of stone powder, 0.1-0.2 part of gypsum retarder, 0.01-0.02 part of water-retaining agent, 0.01-0.02 part of rubber powder, 0.05-0.15 part of defoaming agent and 0.1-0.15 part of water reducing agent. The building gypsum, the quartz sand and the stone powder are uniformly mixed according to the proportion, then the gypsum retarder, the water-retaining agent, the rubber powder, the defoaming agent and the water-reducing agent are sequentially added, and after uniform mixing, water is added, and the mixture is stirred and uniformly mixed, so that the repair mortar is prepared. The repair mortar disclosed by the invention is high in tensile bonding strength, can realize quick repair of the gypsum-based self-leveling ground, is convenient and quick to repair, is high in efficiency, does not shrink or crack on the ground in the later period, and well solves the problem that the cracked gypsum-based self-leveling ground cannot be completely repaired.
Description
Technical Field
The invention belongs to the technical field of gypsum building materials, and particularly relates to gypsum-based self-leveling repair mortar and a preparation method thereof.
Background
The self-leveling gypsum-base mortar is a kind of dry powder material specially for leveling indoor floor, which is prepared with high strength gypsum, aggregate and various building chemical additives and through careful preparation and mixing. The corresponding product standard established in China is JC/T1023-2007 gypsum-based self-leveling mortar. According to different gypsum types, the gypsum-based self-leveling cementing material mainly adopts alpha semi-hydrated high-strength gypsum, building gypsum and anhydrite.
The ground constructed by gypsum-based self-leveling has accurate size, high levelness, easiness and convenience in operation and high efficiency, and can be constructed by pumping, and daily paved ground can reach 800-1000 m2Compared with the traditional ground materialThe construction speed is 5-10 times faster; the gypsum-based self-leveling hardened floor has certain elasticity, warm and comfortable foot feeling and certain sound insulation effect. With the continuous development of gypsum-based self-leveling technology and products in China, the demand of the society for gypsum-based self-leveling ground is larger and larger, the construction modes are diversified and streamlined, and some gypsum-based self-leveling ground which is caused by emergent work has abnormal cracking phenomenon in the later period, so that huge engineering quantity and capital consumption are faced during rework, the later construction period is delayed, and a quick and effective solution is needed.
Therefore, there is a need to provide an improved technical solution for repairing the abnormal cracking of the gypsum-based self-leveling floor in the later period in the prior art.
Disclosure of Invention
The invention aims to provide gypsum-based self-leveling repair mortar and a preparation method thereof, which are used for solving the problem that the gypsum-based self-leveling floor cannot be completely repaired after cracking.
In order to achieve the above purpose, the invention provides the following technical scheme:
the gypsum-based self-leveling repair mortar comprises the following components in parts by weight: 40-60 parts of building gypsum, 40-60 parts of quartz sand, 0-10 parts of stone powder, 0.1-0.2 part of gypsum retarder, 0.01-0.02 part of water-retaining agent, 0.01-0.02 part of rubber powder, 0.05-0.15 part of defoaming agent and 0.1-0.15 part of water reducing agent.
The gypsum-based self-leveling repair mortar comprises the following components in parts by weight: 45 parts of building gypsum, 45 parts of quartz sand, 10 parts of stone powder, 0.1 part of gypsum retarder, 0.01 part of water-retaining agent, 0.01 part of rubber powder, 0.1 part of defoaming agent and 0.1 part of water reducing agent.
The gypsum-based self-leveling repair mortar has the advantages that the fineness of the quartz sand is 50-100 meshes as a preferred scheme; the content of silicon dioxide in mineral components of the quartz sand is more than or equal to 94 wt%.
According to the gypsum-based self-leveling repair mortar, as a preferable scheme, the stone powder is heavy calcium carbonate powder, and the content of calcium carbonate in the heavy calcium carbonate is more than 90 wt%;
preferably, the fineness of the heavy calcium carbonate powder is 200-250 meshes.
According to the gypsum-based self-leveling repair mortar, as a preferable scheme, the gypsum retarder is tartaric acid or sodium acrylate, or a composite retarder formed by mixing tartaric acid and sodium acrylate;
preferably, the composite retarder is prepared by mixing the tartaric acid and the sodium acrylate according to a mass ratio of 1: (2.5-4) mixing;
more preferably, the composite retarder is a mixture of tartaric acid and sodium acrylate according to a mass ratio of 1:3, and mixing.
Preferably, the gypsum-based self-leveling repair mortar is prepared by adding a water-retaining agent and a surfactant to the mortar.
The gypsum-based self-leveling repair mortar has the advantages that as a preferable scheme, the rubber powder is redispersible latex powder;
preferably, the redispersible latex powder is one of ethylene/vinyl acetate copolymer rubber powder, vinyl acetate/versatic acid ethylene copolymer rubber powder and acrylic acid copolymer rubber powder.
The gypsum-based self-leveling repair mortar is preferably characterized in that the defoaming agent is an organic silicon defoaming agent;
preferably, the water reducing agent is a polycarboxylic acid water reducing agent.
A method of preparing a gypsum-based self-leveling repair mortar as claimed in any one of the preceding claims, the method comprising the steps of:
step one, weighing building gypsum, quartz sand and stone powder in a container according to a ratio, stirring and mixing uniformly, then sequentially adding a gypsum retarder, a water-retaining agent, rubber powder, a defoaming agent and a water-reducing agent, and stirring and mixing uniformly to obtain a dry powder;
and step two, adding water into the dry powder obtained in the step one, and stirring and mixing uniformly to obtain the gypsum-based self-leveling repair mortar.
As a preferable mode of the method for preparing the gypsum-based self-leveling repair mortar, the method for preparing the building gypsum in the first step comprises the following steps: calcining desulfurized gypsum at 160-165 ℃ for 1-2 h, cooling to room temperature, then grinding in a ball mill, and aging for 5-7 d to obtain the building gypsum;
preferably, the mass ratio of the water to the dry powder in the second step is (0.25-0.3): 1.
compared with the closest prior art, the technical scheme provided by the invention has the following excellent effects:
the gypsum-based self-leveling repair mortar disclosed by the invention is convenient and fast to repair the gypsum-based self-leveling ground, is high in efficiency, and does not crack the ground again in the later period; the problem that the gypsum-based self-leveling floor is cracked and cannot be completely repaired is well solved, and the repairing method can be specially used for repairing the gypsum-based self-leveling floor.
The gypsum-based self-leveling repair mortar has high tensile bonding strength, does not shrink or crack on the ground in the later period after being used for repairing the self-leveling ground, can realize the quick repair of the gypsum-based self-leveling ground, does not need to completely break the ground for reworking, solves the environmental protection problem, and saves the ground repair cost.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
The gypsum-based self-leveling repair mortar disclosed by the invention adopts building gypsum and quartz sand as main materials, the main materials and the auxiliary materials are uniformly mixed and then added with water and stirred to prepare the mortar, the preparation method is simple, the cost is low, the prepared gypsum-based self-leveling floor repair mortar is high in tensile bonding strength, and after the gypsum-based self-leveling floor repair mortar is used for repairing the self-leveling floor, the floor is free of shrinkage and cracking in the later period, and the rapid repair of the gypsum-based self-leveling floor can be realized.
The invention provides gypsum-based self-leveling repair mortar which comprises the following components in parts by weight: 40 to 60 parts (such as 40 parts, 42 parts, 44 parts, 46 parts, 48 parts, 50 parts, 52 parts, 54 parts, 56 parts, 58 parts, 60 parts) of building gypsum, 40 to 60 parts (such as 40 parts, 42 parts, 44 parts, 46 parts, 48 parts, 50 parts, 52 parts, 54 parts, 56 parts, 58 parts, 60 parts) of quartz sand, 0 to 10 parts (such as 0 part, 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts) of gypsum retarder, 0.1 to 0.2 part (such as 0.1 part, 0.11 part, 0.12 part, 0.13 part, 0.14 part, 0.15 part, 0.16 part, 0.17 part, 0.18 part, 0.19 part, 0.2 part) of gypsum retarder, 0.01 to 0.02 part (such as 0.01 part, 0.011 part, 0.017 part, 0.016 part, 0.014 part, 0.01 part, 0.013 part, 0.01 part of water-retaining agent, 0.02 part, 0.01 part, 0.017, 0.02 part, 0.01 part, 0.017, 0.01 part, 0.019 parts and 0.02 part), 0.05 to 0.15 part (e.g., 0.05 part, 0.06 part, 0.07 part, 0.08 part, 0.09 part, 0.10 part, 0.11 part, 0.12 part, 0.13 part, 0.14 part, 0.15 part) of a defoaming agent, and 0.1 to 0.15 part (e.g., 0.1 part, 0.11 part, 0.12 part, 0.13 part, 0.14 part, 0.15 part) of a water reducing agent.
In the embodiment of the invention, the gypsum-based self-leveling repair mortar preferably comprises the following components in parts by weight: 45 parts of building gypsum, 45 parts of quartz sand, 10 parts of stone powder, 0.1 part of gypsum retarder, 0.01 part of water-retaining agent, 0.01 part of rubber powder, 0.1 part of defoaming agent and 0.1 part of water reducing agent.
In the specific embodiment of the invention, the fineness of the quartz sand is 50-100 meshes (such as 50 meshes, 60 meshes, 70 meshes, 80 meshes, 90 meshes and 100 meshes); the content of silicon dioxide in mineral components of the quartz sand is more than or equal to 94 wt%.
The stone powder is heavy calcium carbonate powder, and the content of calcium carbonate in the heavy calcium carbonate is more than 90 wt%;
preferably, the fineness of the heavy calcium carbonate powder is 200-250 meshes (such as 200 meshes, 210 meshes, 220 meshes, 230 meshes, 240 meshes and 250 meshes).
In the specific embodiment of the invention, the gypsum retarder is tartaric acid or sodium acrylate, or a composite retarder formed by mixing tartaric acid and sodium acrylate;
preferably, the composite retarder is prepared by mixing tartaric acid and sodium acrylate according to a mass ratio of 1: (2.5-4) (for example, 1:2.5, 1:2.8, 1:3, 1:3.2, 1:3.4, 1:3.6, 1:3.8, 1:4) by mixing;
more preferably, the composite retarder is prepared by mixing tartaric acid and sodium acrylate according to a mass ratio of 1:3, and mixing.
In a particular embodiment of the invention, the water retaining agent is hydroxypropyl methylcellulose ether.
In the specific embodiment of the invention, the rubber powder is re-dispersible latex powder;
preferably, the redispersible latex powder is one of ethylene/vinyl acetate copolymer rubber powder, vinyl acetate/versatic acid ethylene copolymer rubber powder and acrylic acid copolymer rubber powder.
In a particular embodiment of the invention, the defoamer is a silicone defoamer; preferably, the water reducing agent is a polycarboxylic acid water reducing agent.
In order to further understand the gypsum-based self-leveling repair mortar, the invention also provides a preparation method of the gypsum-based self-leveling repair mortar, which comprises the following steps:
step one, weighing building gypsum, quartz sand and stone powder in a container according to a ratio, stirring and mixing uniformly, then sequentially adding a gypsum retarder, a water-retaining agent, rubber powder, a defoaming agent and a water-reducing agent, and stirring and mixing uniformly to obtain a dry powder;
and step two, adding a certain amount of water into the dry powder obtained in the step one, and stirring and mixing uniformly to obtain the gypsum-based self-leveling repair mortar.
In the embodiment of the invention, the preparation method of the building gypsum in the first step comprises the following steps: calcining desulfurized gypsum at 160-165 ℃ (such as 160 ℃, 161 ℃, 162 ℃, 163 ℃, 164 ℃ and 165 ℃) for 1-2 h (such as 1h, 1.1h, 1.2h, 1.3h, 1.4h, 1.5h, 1.6h, 1.7h, 1.8h, 1.9h and 2h), cooling to room temperature, grinding in a ball mill, and aging for 5-7 d (such as 5d, 5.5d, 6d, 6.5d and 7d) to obtain building gypsum;
preferably, the mass ratio of the water to the dry powder in the second step is (0.25-0.3): 1 (e.g., 0.25:1, 0.255:1, 0.26:1, 0.265:1, 0.27:1, 0.275:1, 0.28:1, 0.285:1, 0.29:1, 0.295:1, 0.3: 1).
Unless otherwise specified, the raw materials used in the examples of the present invention and the comparative examples satisfy the following performance requirements: the fineness of the quartz sand is 50-100 meshes, and the content of silicon dioxide in mineral components of the quartz sand is more than or equal to 94 wt%; the stone powder is heavy calcium carbonate, the content of calcium carbonate in the heavy calcium carbonate is more than 90 wt%, and the fineness of the heavy calcium carbonate powder is 200-250 meshes; tartaric acid and sodium acrylate were both analytically pure.
Example 1
The embodiment provides a gypsum-based self-leveling repair mortar, which comprises the following components in parts by weight: 40 parts of building gypsum, 50 parts of quartz sand, 10 parts of stone powder, 0.1 part of gypsum retarder, 0.01 part of water-retaining agent, 0.01 part of rubber powder, 0.1 part of defoaming agent, 0.1 part of water reducing agent and 25 parts of water.
The preparation method of the building gypsum comprises the following steps: and (3) calcining the desulfurized gypsum at 160 ℃ for 2h, cooling to room temperature, then grinding in a ball mill, and aging for 6d to obtain the building gypsum.
The preparation method of the gypsum-based self-leveling repair mortar in the embodiment is as follows:
step one, weighing 400kg of building gypsum, 500kg of quartz sand and 100kg of stone powder in a container according to a ratio, stirring and mixing uniformly, then sequentially adding 1kg of a composite retarder (formed by mixing tartaric acid and sodium acrylate according to a mass ratio of 1: 2.5), 0.1kg of a hydroxypropyl methyl cellulose ether water-retaining agent, 0.1kg of ethylene/vinyl acetate copolymer powder, 1.0kg of an organic silicon defoamer and 1.0kg of a polycarboxylic acid water-reducing agent, stirring and mixing uniformly to obtain a dry powder material;
and step two, adding 250kg of water into the dry powder obtained in the step one, and stirring and mixing uniformly to obtain the mortar.
And (3) performance testing:
the gypsum-based self-leveling repair mortar prepared in the embodiment of the invention is subjected to initial setting time, final setting time, tensile bonding strength and shrinkage rate tests, wherein the initial setting time and the final setting time are tested according to JC/T727 standard; the determination of tensile bond strength is tested according to JC/T985-2005, the gypsum-based self-leveling repair mortar prepared in the embodiment of the invention has the initial setting time of 80min, the final setting time of 100min, the tensile bond strength of 1.0MPa, the shrinkage rate of-0.02 percent and the shrinkage rate of a negative value, which indicates that the repair mortar can slightly expand after setting and hardening. In addition, after the gypsum-based self-leveling repair mortar in the embodiment repairs the gypsum-based self-leveling ground, the ground is not shrunk and cracked within 1 year.
Example 2
The embodiment provides a gypsum-based self-leveling repair mortar, which comprises the following components in parts by weight: 45 parts of building gypsum, 45 parts of quartz sand, 10 parts of stone powder, 0.1 part of gypsum retarder, 0.01 part of water-retaining agent, 0.01 part of rubber powder, 0.1 part of defoaming agent, 0.1 part of water reducing agent and 25 parts of water.
The preparation method of the building gypsum comprises the following steps: and (3) calcining the desulfurized gypsum at 160 ℃ for 2h, cooling to room temperature, then grinding in a ball mill, and aging for 6d to obtain the building gypsum.
The preparation method of the gypsum-based self-leveling repair mortar in the embodiment is as follows:
weighing 450kg of building gypsum, 450kg of quartz sand and 100kg of stone powder in a container according to a ratio, stirring and mixing uniformly, then sequentially adding 1.0kg of composite retarder (formed by mixing tartaric acid and sodium acrylate according to a mass ratio of 1: 3), 0.1kg of hydroxypropyl methyl cellulose ether water-retaining agent, 0.1kg of ethylene/vinyl acetate copolymerized rubber powder, 1.0kg of organic silicon defoamer and 1.0kg of polycarboxylic acid water reducer, stirring and mixing uniformly to obtain a dry powder material;
and step two, adding 250kg of water into the dry powder obtained in the step one, and stirring and mixing uniformly to obtain the mortar.
The gypsum-based self-leveling repair mortar in this example was tested for initial setting time, final setting time, tensile bond strength, and shrinkage, and the test standards and methods were the same as those in example 1 and will not be described herein again.
Tests prove that the gypsum-based self-leveling repair mortar prepared in the embodiment of the invention has the initial setting time of 60min, the final setting time of 75min, the tensile bonding strength of 1.1MPa, the shrinkage rate of-0.02% and the negative shrinkage rate, which indicates that the repair mortar can slightly expand after setting and hardening. In addition, after the gypsum-based self-leveling repair mortar in the embodiment repairs the gypsum-based self-leveling ground, the ground is not shrunk and cracked within 1 year.
Example 3
The embodiment provides a gypsum-based self-leveling repair mortar, which comprises the following components in parts by weight: 50 parts of building gypsum, 45 parts of quartz sand, 5 parts of stone powder, 0.15 part of gypsum retarder, 0.015 part of water-retaining agent, 0.015 part of rubber powder, 0.13 part of defoaming agent, 0.12 part of water reducing agent and 28 parts of water.
The preparation method of the building gypsum comprises the following steps: and (3) calcining the desulfurized gypsum at 160 ℃ for 2h, cooling to room temperature, then grinding in a ball mill, and aging for 5d to obtain the building gypsum.
The preparation method of the gypsum-based self-leveling repair mortar in the embodiment is as follows:
step one, weighing 500kg of building gypsum, 450kg of quartz sand and 50kg of stone powder in a container according to a ratio, stirring and mixing uniformly, then sequentially adding 1.5kg of tartaric acid, 0.15kg of hydroxypropyl methyl cellulose ether water-retaining agent, 0.15kg of ethylene/vinyl acetate copolymer powder, 1.3kg of organic silicon defoamer and 1.2kg of water-reducing agent, stirring and mixing uniformly to obtain a dry powder;
and step two, adding 280kg of water into the dry powder obtained in the step one, and stirring and mixing uniformly to obtain the mortar.
The gypsum-based self-leveling repair mortar in this example was tested for initial setting time, final setting time, tensile bond strength, and shrinkage, and the test standards and methods were the same as those in example 1 and will not be described herein again.
Tests prove that the gypsum-based self-leveling repair mortar prepared in the embodiment of the invention has the initial setting time of 80min, the final setting time of 105min, the tensile bonding strength of 1.2MPa, the shrinkage rate of-0.03% and the negative shrinkage rate, which indicates that the repair mortar can slightly expand after setting and hardening. In addition, after the gypsum-based self-leveling repair mortar in the embodiment repairs the gypsum-based self-leveling ground, the ground is not shrunk and cracked within 1 year.
Example 4
The embodiment provides a gypsum-based self-leveling repair mortar, which comprises the following components in parts by weight: 55 parts of building gypsum, 40 parts of quartz sand, 5 parts of stone powder, 0.15 part of gypsum retarder, 0.015 part of water-retaining agent, 0.015 part of rubber powder, 0.13 part of defoaming agent, 0.12 part of water reducing agent and 38 parts of water.
The preparation method of the building gypsum comprises the following steps: and (3) calcining the desulfurized gypsum at 160 ℃ for 2h, cooling to room temperature, then grinding in a ball mill, and aging for 7d to obtain the building gypsum.
The preparation method of the gypsum-based self-leveling repair mortar in the embodiment is as follows:
step one, weighing 550kg of building gypsum, 400kg of quartz sand and 50kg of stone powder in a container according to a ratio, stirring and mixing uniformly, then sequentially adding 1.5kg of a composite retarder (formed by mixing tartaric acid and sodium acrylate according to a mass ratio of 1:4), 0.15kg of a hydroxypropyl methyl cellulose ether water-retaining agent, 0.15kg of ethylene/vinyl acetate copolymerized rubber powder, 1.3kg of an organic silicon defoamer and 1.2kg of a water reducing agent, stirring and mixing uniformly to obtain a dry powder material;
and step two, adding 380kg of water into the dry powder obtained in the step one, and stirring and mixing uniformly to obtain the mortar.
The gypsum-based self-leveling repair mortar in this example was tested for initial setting time, final setting time, tensile bond strength, and shrinkage, and the test standards and methods were the same as those in example 1 and will not be described herein again.
Tests prove that the gypsum-based self-leveling repair mortar prepared in the embodiment of the invention has the initial setting time of 70min, the final setting time of 90min, the tensile bonding strength of 1.3MPa, the shrinkage rate of-0.02% and the negative shrinkage rate, which indicates that the repair mortar can slightly expand after setting and hardening. In addition, after the gypsum-based self-leveling repair mortar in the embodiment repairs the gypsum-based self-leveling ground, the ground is not shrunk and cracked within 1 year.
Example 5
The embodiment provides a gypsum-based self-leveling repair mortar, which comprises the following components in parts by weight: 60 parts of building gypsum, 40 parts of quartz sand, 0 part of stone powder, 0.2 part of gypsum retarder, 0.02 part of water-retaining agent, 0.02 part of rubber powder, 0.15 part of defoaming agent, 0.15 part of water reducing agent and 30 parts of water.
The preparation method of the building gypsum comprises the following steps: and (3) calcining the desulfurized gypsum at 165 ℃ for 2h, cooling to room temperature, then grinding in a ball mill, and aging for 6d to obtain the architectural gypsum.
The preparation method of the gypsum-based self-leveling repair mortar in the embodiment is as follows:
weighing 600kg of building gypsum and 400kg of quartz sand in a container according to a ratio, stirring and mixing uniformly, then sequentially adding 2kg of sodium acrylate, 0.2kg of hydroxypropyl methyl cellulose ether water-retaining agent, 0.2kg of vinyl acetate/vinyl versatate copolymer powder, 1.5kg of organic silicon defoamer and 1.5kg of water reducer, stirring and mixing uniformly to obtain a dry powder material;
and step two, adding 300kg of water into the dry powder obtained in the step one, and stirring and mixing uniformly to obtain the mortar.
The gypsum-based self-leveling repair mortar in this example was tested for initial setting time, final setting time, tensile bond strength, and shrinkage, and the test standards and methods were the same as those in example 1 and will not be described herein again.
Tests prove that the gypsum-based self-leveling repair mortar prepared in the embodiment of the invention has the initial setting time of 75min, the final setting time of 90min, the tensile bonding strength of 1.5MPa, the shrinkage rate of-0.02% and the negative shrinkage rate, which indicates that the repair mortar can slightly expand after setting and hardening. In addition, after the gypsum-based self-leveling repair mortar in the embodiment repairs the gypsum-based self-leveling ground, the ground is not shrunk and cracked within 1 year.
Example 6
The embodiment provides a gypsum-based self-leveling repair mortar, which comprises the following components in parts by weight: 40 parts of building gypsum, 60 parts of quartz sand, 0.2 part of gypsum retarder, 0.02 part of water-retaining agent, 0.02 part of rubber powder, 0.15 part of defoaming agent, 0.15 part of water reducing agent and 30 parts of water.
The preparation method of the building gypsum comprises the following steps: and (3) calcining the desulfurized gypsum at 165 ℃ for 1h, cooling to room temperature, then grinding in a ball mill, and aging for 6d to obtain the architectural gypsum.
The preparation method of the gypsum-based self-leveling repair mortar in the embodiment is as follows:
step one, weighing 400kg of building gypsum and 600kg of quartz sand in a container according to a ratio, stirring and mixing uniformly, then sequentially adding 2.0kg of tartaric acid, 0.2kg of hydroxypropyl methyl cellulose ether water-retaining agent, 0.2kg of acrylic acid copolymerized rubber powder, 1.5kg of organic silicon defoamer and 1.5kg of water reducer, stirring and mixing uniformly to obtain a dry powder;
and step two, adding 300kg of water into the dry powder obtained in the step one, and stirring and mixing uniformly to obtain the mortar.
The gypsum-based self-leveling repair mortar in this example was tested for initial setting time, final setting time, tensile bond strength, and shrinkage, and the test standards and methods were the same as those in example 1 and will not be described herein again.
Tests prove that the gypsum-based self-leveling repair mortar prepared in the embodiment of the invention has the initial setting time of 120min, the final setting time of 150min, the tensile bonding strength of 1.3MPa, the shrinkage rate of-0.01 percent and the negative shrinkage rate, which indicates that the repair mortar can slightly expand after setting and hardening. In addition, after the gypsum-based self-leveling repair mortar in the embodiment repairs the gypsum-based self-leveling ground, the ground is not shrunk and cracked within 1 year.
Comparative example 1
This contrast example provides a gypsum-based self-leveling repair mortar, and by weight, the formula of the gypsum-based self-leveling repair mortar is: 40 parts of building gypsum, 40 parts of quartz sand, 20 parts of stone powder, 0.1 part of gypsum retarder, 0.01 part of water-retaining agent, 0.01 part of rubber powder, 0.1 part of defoaming agent, 0.1 part of water reducing agent and 28 parts of water.
The preparation method of the building gypsum comprises the following steps: and (3) calcining the desulfurized gypsum at 160 ℃ for 2h, cooling to room temperature, then grinding in a ball mill, and aging for 6d to obtain the building gypsum.
The preparation method of the gypsum-based self-leveling repair mortar in the embodiment is as follows:
step one, weighing 400kg of building gypsum, 400kg of quartz sand and 200kg of stone powder in a container according to a ratio, stirring and mixing uniformly, then sequentially adding 1.0kg of composite retarder (formed by mixing tartaric acid and sodium acrylate according to a mass ratio of 1: 3), 0.1kg of hydroxypropyl methyl cellulose ether water-retaining agent, 0.1kg of ethylene/vinyl acetate copolymerized rubber powder, 1.0kg of organic silicon defoamer and 1.0kg of water reducing agent, stirring and mixing uniformly to obtain a dry powder material;
and step two, adding 280kg of water into the dry powder obtained in the step one, and stirring and mixing uniformly to obtain the mortar.
The gypsum-based self-leveling repair mortar in the comparative example was tested for initial setting time, final setting time, tensile bond strength and shrinkage, and the test standards and methods were the same as those in example 1 and will not be described herein again.
Tests show that the gypsum-based self-leveling repair mortar prepared in the comparative example has the initial setting time of 80min, the final setting time of 100min, the tensile bonding strength of 1MPa, the shrinkage rate of-0.02% and the negative shrinkage rate, which indicates that the repair mortar undergoes micro-expansion after setting and hardening. However, the gypsum-based self-leveling repair mortar in the comparative example is easy to crack after the gypsum-based self-leveling floor is repaired due to excessive addition of the stone powder.
Comparative example 2
This contrast example provides a gypsum-based self-leveling repair mortar, and by weight, the formula of the gypsum-based self-leveling repair mortar is: 20 parts of building gypsum, 65 parts of quartz sand, 15 parts of stone powder, 0.1 part of gypsum retarder, 0.01 part of water-retaining agent, 0.01 part of rubber powder, 0.1 part of defoaming agent, 0.1 part of water reducing agent and 25 parts of water.
The preparation method of the building gypsum comprises the following steps: and (3) calcining the desulfurized gypsum at 160 ℃ for 2h, cooling to room temperature, then grinding in a ball mill, and aging for 6d to obtain the building gypsum.
The preparation method of the gypsum-based self-leveling repair mortar in the embodiment is as follows:
step one, weighing 200kg of building gypsum, 650kg of quartz sand and 150kg of stone powder in a container according to a ratio, stirring and mixing uniformly, then sequentially adding 1.0kg of composite retarder (formed by mixing tartaric acid and sodium acrylate according to a mass ratio of 1: 3), 0.1kg of hydroxypropyl methyl cellulose ether water-retaining agent, 0.1kg of ethylene/vinyl acetate copolymerized rubber powder, 1.0kg of organic silicon defoamer and 1.0kg of water reducing agent, stirring and mixing uniformly to obtain a dry powder material;
and step two, adding 250kg of water into the dry powder obtained in the step one, and stirring and mixing uniformly to obtain the mortar.
The gypsum-based self-leveling repair mortar in the comparative example was tested for initial setting time, final setting time, tensile bond strength and shrinkage, and the test standards and methods were the same as those in example 1 and will not be described herein again.
Tests show that the gypsum-based self-leveling repair mortar prepared in the comparative example has an initial setting time of 120min, a final setting time of 150min, a tensile bonding strength of 0.7MPa and a shrinkage rate of 0. However, the gypsum-based self-leveling repair mortar prepared in the comparative example has a phenomenon of sedimentation and bleeding after the gypsum-based self-leveling floor is repaired due to excessive addition of quartz sand.
Comparative example 3
This contrast example provides a gypsum-based self-leveling repair mortar, and by weight, the formula of the gypsum-based self-leveling repair mortar is: 80 parts of building gypsum, 20 parts of quartz sand, 0 part of stone powder, 0.1 part of gypsum retarder, 0.01 part of water-retaining agent, 0.01 part of rubber powder, 0.1 part of defoaming agent, 0.1 part of water reducing agent and 30 parts of water.
The preparation method of the building gypsum comprises the following steps: and (3) calcining the desulfurized gypsum at 160 ℃ for 2h, cooling to room temperature, then grinding in a ball mill, and aging for 6d to obtain the building gypsum.
The preparation method of the gypsum-based self-leveling repair mortar in the embodiment is as follows:
weighing 800kg of building gypsum and 200kg of quartz sand in a container according to a ratio, stirring and mixing uniformly, then sequentially adding 1.0kg of a composite retarder (formed by mixing tartaric acid and sodium acrylate according to a mass ratio of 1: 3), 0.1kg of a hydroxypropyl methyl cellulose ether water-retaining agent, 0.1kg of ethylene/vinyl acetate copolymer powder, 1.0kg of an organic silicon defoamer and 1.0kg of a water reducing agent, and stirring and mixing uniformly to obtain a dry powder;
and step two, adding 300kg of water into the dry powder obtained in the step one, and stirring and mixing uniformly to obtain the mortar.
The gypsum-based self-leveling repair mortar in the comparative example was tested for initial setting time, final setting time, tensile bond strength and shrinkage, and the test standards and methods were the same as those in example 1 and will not be described herein again.
Tests show that the gypsum-based self-leveling repair mortar prepared in the comparative example has the initial setting time of 30min, the final setting time of 45min, the tensile bonding strength of 1.4MPa, the shrinkage rate of-0.03% and the negative shrinkage rate, which indicates that the repair mortar undergoes micro-expansion after setting and hardening. In the comparative example, the prepared repair mortar is too fast in setting and hardening when used for repairing the gypsum-based self-leveling floor surface due to the fact that the content of the building gypsum in the gypsum-based self-leveling repair mortar is too much, the repair mortar is not fully infiltrated into cracks, the repair mortar is hardened, and a good repair effect cannot be achieved.
The following table 1 shows performance data of the gypsum-based self-leveling repair mortar prepared in examples 1 to 6 and comparative examples 1 to 3.
Properties of the gypsum-based self-leveling repair mortars prepared in Table 1, examples and comparative example
The data in the table show that the gypsum-based self-leveling repair mortar prepared in example 2 has optimal performance, the tensile bonding strength is ensured, the cost is reduced, the setting time is most appropriate within 60min, the repair mortar can be ensured to fully infiltrate into cracks to achieve a good repair effect, and the time cost can be saved. The component proportion of the building gypsum, the quartz sand and the stone powder plays an important role in the performance of the prepared gypsum-based self-leveling repair mortar, cracking is caused by excessive stone powder, bleeding and sedimentation are easy to occur due to excessive quartz sand, the setting time is too short due to excessive building gypsum, the mortar cannot fully penetrate into cracks and is then set and hardened, and a good repair effect cannot be achieved.
In conclusion, the gypsum-based self-leveling repair mortar prepared by the invention has high tensile bonding strength, does not shrink or crack in the later period after being used for repairing the gypsum-based self-leveling ground, can realize quick repair of the gypsum-based self-leveling ground, and saves the ground repair cost while solving the environmental protection problem; the repair mortar can be specially used for repairing the gypsum-based self-leveling floor, the repair of the gypsum-based self-leveling floor is convenient and fast, the efficiency is high, and the floor does not crack again in the later period; the problem that the gypsum-based self-leveling floor is cracked and cannot be repaired completely is well solved.
The above description is only exemplary of the invention and should not be taken as limiting the invention, as any modification, equivalent replacement, or improvement made within the spirit and principle of the invention is intended to be covered by the appended claims.
Claims (15)
1. The gypsum-based self-leveling repair mortar is characterized by being prepared from the following components in parts by weight and water: 40-60 parts of building gypsum, 40-60 parts of quartz sand, 0-10 parts of stone powder, 0.1-0.2 part of gypsum retarder, 0.01-0.02 part of water-retaining agent, 0.01-0.02 part of rubber powder, 0.05-0.15 part of defoaming agent and 0.1-0.15 part of water reducing agent; the mass ratio of the water to all the components is (0.25-0.3): 1.
2. the gypsum-based self-leveling repair mortar of claim 1, wherein the gypsum-based self-leveling repair mortar comprises the following components in parts by weight: 45 parts of building gypsum, 45 parts of quartz sand, 10 parts of stone powder, 0.1 part of gypsum retarder, 0.01 part of water-retaining agent, 0.01 part of rubber powder, 0.1 part of defoaming agent and 0.1 part of water reducing agent.
3. The gypsum-based self-leveling repair mortar of claim 1, wherein the fineness of the quartz sand is 50 to 100 meshes; the content of silicon dioxide in mineral components of the quartz sand is more than or equal to 94 wt%.
4. The gypsum-based self-leveling repair mortar of claim 1, wherein the stone powder is ground calcium carbonate powder, and the content of calcium carbonate in the ground calcium carbonate is greater than 90 wt%.
5. The gypsum-based self-leveling repair mortar of claim 4, wherein the heavy calcium carbonate powder has a fineness of 200 to 250 mesh.
6. The gypsum-based self-leveling repair mortar of claim 1, wherein the gypsum retarder is tartaric acid, or sodium acrylate, or a composite retarder in which tartaric acid and sodium acrylate are mixed.
7. The gypsum-based self-leveling repair mortar of claim 6, wherein the composite retarder is a mixture of tartaric acid and sodium acrylate in a mass ratio of 1: (2.5-4) mixing.
8. The gypsum-based self-leveling repair mortar of claim 6, wherein the composite retarder is a mixture of tartaric acid and sodium acrylate in a mass ratio of 1:3, and mixing.
9. The gypsum-based self-leveling repair mortar of claim 1, wherein the water retaining agent is hydroxypropyl methyl cellulose ether.
10. The gypsum-based self-leveling repair mortar of claim 1, wherein the rubber powder is a redispersible latex powder.
11. The gypsum-based self-leveling repair mortar of claim 10, wherein the redispersible latex powder is one of ethylene/vinyl acetate copolymer rubber powder, vinyl acetate/versatic acid ethylene copolymer rubber powder, and acrylic acid copolymer rubber powder.
12. The gypsum-based self-leveling repair mortar of claim 1, wherein the defoamer is a silicone defoamer.
13. The gypsum-based self-leveling repair mortar of claim 12, wherein the water reducing agent is a polycarboxylic acid water reducing agent.
14. A method for preparing the gypsum-based self-leveling repair mortar according to any one of claims 1 to 13, wherein the method comprises the following steps:
step one, weighing building gypsum, quartz sand and stone powder in a container according to a ratio, stirring and mixing uniformly, then sequentially adding a gypsum retarder, a water-retaining agent, rubber powder, a defoaming agent and a water-reducing agent, and stirring and mixing uniformly to obtain a dry powder;
and step two, adding water into the dry powder obtained in the step one, and stirring and mixing uniformly to obtain the gypsum-based self-leveling repair mortar.
15. The method of preparing a gypsum-based self-leveling repair mortar of claim 14, wherein the method of preparing the building gypsum in the first step comprises: and calcining the desulfurized gypsum at 160-165 ℃ for 1-2 h, cooling to room temperature, then grinding in a ball mill, and aging for 5-7 d to obtain the building gypsum.
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| CN112794729B (en) * | 2020-10-20 | 2022-08-30 | 长兴欧立亚新型建材有限公司 | Moisture-resistant sound-insulation gypsum-based self-leveling mortar |
| CN112694343B (en) * | 2021-02-08 | 2022-06-21 | 河南强耐新材股份有限公司 | High-strength heat-preservation sound-insulation gypsum-based self-leveling mortar and preparation method thereof |
| CN113511872A (en) * | 2021-03-18 | 2021-10-19 | 中建材创新科技研究院有限公司 | Gypsum ground leveling mortar and preparation method thereof |
| CN113956005A (en) * | 2021-12-08 | 2022-01-21 | 湖南华材友邦科技有限责任公司 | Self-leveling mortar and preparation method thereof |
| CN115010452A (en) * | 2022-05-06 | 2022-09-06 | 苏州市兴邦化学建材有限公司 | Gypsum-based ground ceramic tile bonding mortar and preparation method thereof |
| CN115073112B (en) * | 2022-06-10 | 2023-06-30 | 四川方大新型建材科技开发有限责任公司 | Gypsum-based self-leveling mortar and preparation method thereof |
| CN115093189B (en) * | 2022-06-27 | 2023-05-23 | 河南城建学院 | Gypsum-based self-leveling mortar and preparation method thereof |
| CN115432984A (en) * | 2022-09-14 | 2022-12-06 | 山东中岩重科新材料科技有限公司 | Application of limestone ultrafine powder in gypsum-based self-leveling mortar and gypsum-based self-leveling mortar |
| CN115324303A (en) * | 2022-09-29 | 2022-11-11 | 云南云天化环保科技有限公司 | Gypsum-based self-leveling mortar floor interface treatment method |
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