CN112250408A - Gypsum-based self-leveling mortar and application and construction method thereof - Google Patents
Gypsum-based self-leveling mortar and application and construction method thereof Download PDFInfo
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- CN112250408A CN112250408A CN202011139264.7A CN202011139264A CN112250408A CN 112250408 A CN112250408 A CN 112250408A CN 202011139264 A CN202011139264 A CN 202011139264A CN 112250408 A CN112250408 A CN 112250408A
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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
- C04B28/145—Calcium sulfate hemi-hydrate with a specific crystal form
- C04B28/146—Calcium sulfate hemi-hydrate with a specific crystal form alpha-hemihydrate
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F15/00—Flooring
- E04F15/12—Flooring or floor layers made of masses in situ, e.g. seamless magnesite floors, terrazzo gypsum floors
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
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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
- 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
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- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- Crystallography & Structural Chemistry (AREA)
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- Curing Cements, Concrete, And Artificial Stone (AREA)
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Abstract
The invention discloses gypsum-based self-leveling mortar and an application and construction method thereof. The gypsum-based self-leveling mortar comprises the following components in percentage by weight: 20-40% of alpha-semi-hydrated gypsum powder fired by desulfurized gypsum; 5-20% of alpha-semi-hydrated gypsum powder fired by natural gypsum; 5-10% of heavy calcium powder; 5-15% of cement; 30-50% of sand; 0.5 to 2 percent of rubber powder; 0.1 to 2 percent of composite additive. The invention uses hemihydrate gypsum (CaSO)4·1/2H2O) and type II anhydrite (type II CaSO)4) The self-leveling material for the gypsum-based indoor floor is used as a main cementing material and/or a self-leveling material which is composed of aggregate, filler and an additive and has certain fluidity in a fresh stirring state; the energy-saving effect is better; and the floor hardened by the gypsum-based self-leveling mortar has certain elasticity, and the foot feeling is warm and comfortable.
Description
Technical Field
The invention relates to the field of building materials, in particular to gypsum-based self-leveling mortar and application thereof, and a construction method of a gypsum-based self-leveling mortar energy-saving terrace system.
Background
In recent years, due to the appearance of terraces with high cleanliness, high corrosion resistance, high hardness and decoration effect, organic self-leveling terrace materials prepared by using epoxy resin as a film forming substance are developed and are widely applied. With the advance of energy-saving technology in China, the engineering application of the gypsum-based self-leveling mortar terrace system is also in obvious growth momentum. Compared with cement-based self-leveling mortar, the gypsum-based self-leveling mortar has the advantages of high setting speed, stable volume, no cracking, no hollowing and the like, and has obvious advantages in heavy-layer self-leveling.
The gypsum-based self-leveling terrace material has no shrinkage and cracking after being hardened and has stable volume, but has low surface hardness, poor water resistance and wear resistance, neutrality or acidity and limited application. Therefore, a gypsum-based self-leveling mortar with a high quality level is needed to be developed for various terrace systems.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a gypsum hemihydrate (CaSO)4· 1/2H2O) and type II anhydrite (type II CaSO)4) The self-leveling mortar for the gypsum-based indoor floor is used as a main cementing material and/or is composed of aggregate, filler and an additive after being singly or after being mixed, and has certain fluidity in a fresh stirring state.
Specifically, the invention provides gypsum-based self-leveling mortar which comprises the following components in percentage by weight: 20-40% of alpha-semi-hydrated gypsum powder fired by desulfurized gypsum; 5-20% of alpha-semi-hydrated gypsum powder fired by natural gypsum; 5-10% of heavy calcium powder; 5-15% of cement; 30-50% of sand; 0.5 to 2 percent of rubber powder; 0.1 to 2 percent of composite additive.
In another preferred embodiment, the invention provides gypsum-based self-leveling mortar, which comprises the following components in percentage by weight: 20-40% of alpha-semi-hydrated gypsum powder fired by desulfurized gypsum; 5-20% of alpha-semi-hydrated gypsum powder fired by natural gypsum; 5-10% of heavy calcium powder; 5-15% of cement; 30-50% of sand; 0.5 to 2 percent of rubber powder; 0.1 to 2 percent of composite additive.
In another preferred embodiment, the invention provides gypsum-based self-leveling mortar, which consists of the following components in percentage by weight: 20-40% of alpha-semi-hydrated gypsum powder fired by desulfurized gypsum; 5-20% of type II anhydrous gypsum; 5-10% of heavy calcium powder; 5-15% of cement; 30-50% of sand; 0.5 to 2 percent of rubber powder; 0.1 to 2 percent of composite additive.
In another preferred embodiment, the invention provides gypsum-based self-leveling mortar, which consists of the following components in percentage by weight: 25-60% of type II anhydrous gypsum; 5-10% of heavy calcium powder; 5-15% of cement; 30-50% of sand; 0.5 to 2 percent of rubber powder; 0.1 to 2 percent of composite additive.
Preferably, the alpha-hemihydrate gypsum powder is CaSO4·1/2H2O。
Preferably, the type II anhydrite is type II CaSO4。
Preferably, the sand is dried river sand or quartz sand.
Preferably, the quartz sand is 0.3-0.8 mm.
Preferably, the composite additive comprises the following components in percentage by weight: 0.1 to 0.5 percent of defoaming agent; 0.1-0.5% of cellulose ether; 0.1 to 0.5 percent of high-efficiency water reducing agent; 0.1 to 0.3 percent of retarder.
In another preferred embodiment, the invention provides gypsum-based self-leveling mortar, which consists of the following components in percentage by weight: 20-40% of alpha-semi-hydrated gypsum powder fired by desulfurized gypsum; 5-20% of alpha-semi-hydrated gypsum powder fired by natural gypsum; 5-10% of heavy calcium powder; 5-15% of cement; 30-50% of sand; 0.5 to 2 percent of rubber powder; 0.1 to 0.5 percent of defoaming agent; 0.1-0.5% of cellulose ether; 0.1 to 0.5 percent of high-efficiency water reducing agent; 0.1 to 0.3 percent of retarder.
In a second aspect, the invention also provides application of the gypsum-based self-leveling mortar in preparation of a gypsum-based self-leveling mortar terrace.
In a third aspect, the invention also provides a gypsum-based self-leveling mortar energy-saving terrace system which sequentially comprises a base layer and a gypsum-based self-leveling mortar layer from bottom to top.
Preferably, the gypsum-based self-leveling mortar energy-saving terrace system sequentially comprises a base layer, an interface agent and a gypsum-based self-leveling mortar layer from bottom to top.
Preferably, the gypsum-based self-leveling mortar energy-saving terrace system sequentially comprises a base layer, a self-leveling interface agent and a gypsum-based self-leveling mortar layer from bottom to top.
Preferably, the gypsum-based self-leveling mortar energy-saving terrace system sequentially comprises a base layer, an isolation film and a gypsum-based self-leveling mortar layer from bottom to top.
Preferably, the gypsum-based self-leveling mortar energy-saving terrace system sequentially comprises a base layer, a heat insulation layer, an isolation membrane and a gypsum-based self-leveling mortar layer from bottom to top.
Preferably, the gypsum-based self-leveling mortar energy-saving terrace system sequentially comprises a base layer, a heat insulation layer, an isolation membrane and/or a reflection membrane, a water heating pipe and a gypsum-based self-leveling mortar layer from bottom to top.
Preferably, the gypsum-based self-leveling mortar energy-saving terrace system sequentially comprises a base layer, a heat insulation layer, an isolation membrane, a gypsum-based self-leveling mortar layer and an elastic adhesive tape from bottom to top.
In a fourth aspect, the invention also provides a construction method of the gypsum-based self-leveling mortar energy-saving terrace system, which comprises the following steps: s1, performing base layer processing; s2, stirring the gypsum-based self-leveling mortar; and S3, pouring gypsum-based self-leveling mortar.
Preferably, the ground temperature and the environment temperature during the construction and the maintenance of the gypsum-based self-leveling mortar bed are both more than or equal to 5 ℃, and the relative humidity is not higher than 80%.
Preferably, the construction of the gypsum-based self-leveling mortar bed is carried out after the main structure and the ground base layer are constructed and accepted.
Preferably, the flatness of the base layer in step S1 is checked using a 2m running rule, and the flatness should not be greater than 4mm/2 m.
Preferably, the base layer in step S1 should be a concrete layer or a cement mortar layer.
Preferably, when the base layer is made of concrete in step S1, the compressive strength should not be less than 20 MPa.
Preferably, when the base layer is cement mortar in step S1, the compressive strength thereof should not be less than 15 MPa.
Preferably, the moisture content of the base layer in step S1 should not be greater than 8%.
Preferably, when a crack exists in the base layer in the step S1, the crack is cut into 1/3-2/3V-shaped grooves with a width of 10 mm-20 mm and a depth of the base layer by a mechanical cutting method, and then the repairing material is passed through, poured, leveled and sealed.
Preferably, in step S1, when the empty drum area of the base layer is less than or equal to lm2In time, a grouting method can be adopted for treatment.
Preferably, the first and second electrodes are formed of a metal,when the empty area of the base layer is larger than lm in step S12And in time, the concrete is removed and the construction is repeated.
Preferably, all substrates are pretreated with an interfacial agent in step S1 to prevent the substrate from absorbing water and forming air bubbles on the surface, and the self-leveling gypsum mortar is applied to the substrate after the interfacial agent is completely dried.
Preferably, the first painting in step S1 is performed with a water-based epoxy primer diluted with 50% pure water to deeply penetrate the cured base surface, and after drying, the second painting is performed with a water-based epoxy primer again, and dried quartz sand (0.3-0.8mm) is fully sprinkled on the fresh water-based epoxy primer until the primer is invisible; and (5) after the primer is dried, sucking away the redundant quartz sand by using a dust collector.
Preferably, in step S2, gypsum-based self-leveling mortar powder is poured into purified water at a water-to-powder ratio of about 0.25, and stirred by a stirrer until no caking exists; after curing for about 2 minutes, the construction can be carried out after stirring for a short time again, and the construction is finished within 30 minutes.
Preferably, in step S3, the insulation board-type gypsum-based self-leveling mortar terrace system should check whether the laying, bonding and fixing of the insulation board and the sealing at the joint of the insulation board meet the design requirements before pouring.
Preferably, the gypsum-based self-leveling mortar layer is poured to a thickness of 40-45mm in step S3.
Preferably, the standard fluidity of the gypsum-based self-leveling mortar layer in step S3 is 150mm to 160 mm.
Preferably, in step S3, the gypsum-based self-leveling mortar is mechanically poured onto the construction surface to make it self-spread and level, and a special saw-tooth scraper is used to assist the mortar to spread evenly; after the slurry is spread, a self-leveling defoaming instrument is adopted to deflate and defoam.
The technical proposal of the invention is to use semi-hydrated gypsum (CaSO)4·1/2H2O) and type II anhydrite (type II CaSO)4) The self-leveling material for gypsum-based indoor floor is used as a main cementing material and/or a self-leveling material which is composed of aggregate, filler and an additive and has certain fluidity in a fresh stirring state. Self-leveling gypsum mortar with suitable strengthThe surface layer can be made into ceramic tiles, PVC boards, wood floors, carpets and the like in the industrial ground with medium load and the bottom layer of the indoor ground, such as a residential house, a warehouse, a supermarket and the like. Compared with cement-based self-leveling materials, the gypsum-based self-leveling mortar has the advantages of high condensation speed, stable volume, no cracking, no hollowing and the like, has obvious advantages on thick-layer self-leveling, is an ideal matched material for geothermal heating, and has better energy-saving effect compared with other heating modes for the geothermal heating; and the floor hardened by the gypsum-based self-leveling mortar has certain elasticity, and the foot feeling is warm and comfortable.
The cement self-leveling product in the market has uneven quality due to the shrinkage characteristic of the cementing material cement, so that the self-leveling floor is difficult to ensure not to crack. And the gypsum-based self-leveling mortar has good volume stability and greatly reduces the cracking risk because the cementing material gypsum has the micro-expansion characteristic. Meanwhile, the construction thickness is not limited, the construction thickness of 3mm-80mm can be freely selected according to the ground height difference and the strength condition under the condition of ensuring no cracking, the backfilling and leveling can be completed at one time, the construction efficiency is high, and the cost is saved.
The ordinary cement can be put on people for 24 hours by self-leveling, needs watering for maintenance for 5-7 days or more, and has high maintenance cost. The concrete is hardened more slowly in winter, the construction interval is long, and the construction in a low-temperature environment cannot be realized; the gypsum-based self-leveling mortar has short hardening time, can walk on the ground in 4-6 hours, has the strength of more than 90% of the designed strength in 1 day, can be used for decorative surface layer construction in 1-2 days without seasons, can adopt mechanical pumping and automatic pouring, has a single-machine construction area of 2000 m/day, improves the construction efficiency by more than 10 times, greatly shortens the construction period, and is an optimal ground material for reaching the construction period.
The gypsum-based self-leveling construction method has the advantages that the gypsum-based self-leveling construction is carried out at one time, the later maintenance is not needed, and the gypsum-based self-leveling construction method is widely used for renovating old building ground and backfilling and leveling newly-built building ground engineering. The dry density is only 1600kg/m3About, compare the dry density of the traditional concrete 2400kg/m3The weight can be reduced by 30 percent, the building load is effectively reduced, the building earthquake-resistant grade is improved, and the building design cost is reduced.
The gypsum-based self-leveling is suitable for a floor heating leveling covering layer, and can meet the requirements of floor heating pipe covering and ground leveling through one-time construction. Compared with cement mortar ground heating backfill and cement self-leveling secondary leveling effects, the floor heating leveling method has the advantages of being remarkable. The gypsum-based self-leveling mortar has no cracking, micro-expansion in volume during the setting and hardening process, no shrinkage crack and good thermal stability. Along with the popularization of house production, backfill warms up the building, and the application volume is raised on ground is huge, and gypsum base self-leveling can realize raising and make level two unifications, and follow-up construction can directly carry out the floor tile subsides thinly, the assembly of timber apron, the shop of elastic floor pastes, and this not only can shorten the time limit for a project greatly, and it is effectual to make level moreover.
Drawings
Fig. 1 is a structural diagram of a gypsum-based self-leveling mortar floor system.
1-elastic adhesive tape (optional); 2-gypsum based self-leveling mortar; 3-thin film (barrier film) (optional); 4, heat insulation board; 5-base layer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described 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, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
Example 1
The gypsum-based self-leveling mortar comprises the following components in percentage by weight: 20% of desulfurized gypsum fired alpha-hemihydrate gypsum powder; 10% of natural gypsum fired alpha-hemihydrate gypsum powder; 10 percent of coarse whiting powder; 15% of cement; 41.2 percent of sand; 2% of rubber powder; 0.5 percent of defoaming agent; 0.5% of cellulose ether; 0.5 percent of high-efficiency water reducing agent; 0.3 percent of retarder.
Example 2
The gypsum-based self-leveling mortar comprises the following components in percentage by weight: 40% of desulfurized gypsum fired alpha-hemihydrate gypsum powder; 5% of natural gypsum fired alpha-hemihydrate gypsum powder; 8 percent of coarse whiting powder; 10% of cement ash; 35.2 percent of sand; 1% of rubber powder; 0.1% of defoaming agent; 0.2% of cellulose ether; 0.4 percent of high-efficiency water reducing agent; 0.1 percent of retarder.
Example 3
The gypsum-based self-leveling mortar comprises the following components in percentage by weight: 30.8 percent of desulfurized gypsum fired alpha-hemihydrate gypsum powder; 8% of natural gypsum fired alpha-hemihydrate gypsum powder; 5% of coarse whiting powder; 5% of cement ash; 50% of sand; 0.5 percent of rubber powder; 0.3 percent of defoaming agent; 0.1% of cellulose ether; 0.1 percent of high-efficiency water reducing agent; 0.2 percent of retarder.
Example 4
The gypsum-based self-leveling mortar comprises the following components in percentage by weight: 30.8 percent of desulfurized gypsum fired alpha-hemihydrate gypsum powder; 8% of type II anhydrous gypsum; 5% of coarse whiting powder; 5% of cement ash; 50% of sand; 0.5 percent of rubber powder; 0.3 percent of defoaming agent; 0.1% of cellulose ether; 0.1 percent of high-efficiency water reducing agent; 0.2 percent of retarder.
Example 5
The gypsum-based self-leveling mortar comprises the following components in percentage by weight: 45% of type II anhydrous gypsum; 10 percent of coarse whiting powder; 10% of cement ash; 33.2 percent of sand; 1% of rubber powder; 0.2 percent of defoaming agent; 0.3% of cellulose ether; 0.2 percent of high-efficiency water reducing agent; 0.1 percent of retarder.
Example 6 detection of technical Properties of Gypsum-based self-leveling mortar
Table 1 testing the technical Properties of the Gypsum-based self-leveling mortars of examples 1 to 5
Example 7
Gypsum-based self-leveling mortar energy-saving terrace system
On the base layer or the heat-insulating layer, gypsum-based self-leveling mortar and auxiliary paving materials for the ground which can flow and be leveled are adopted, and the gypsum-based self-leveling mortar and the auxiliary paving materials are stirred and paved to form the indoor energy-saving terrace system.
The indoor energy-saving terrace system consists of a base layer, an interface agent and a gypsum-based self-leveling mortar layer; or an indoor energy-saving terrace system consisting of a base layer, a heat-insulating layer (and a water heating pipe), an isolating film and a gypsum-based self-leveling mortar layer.
Gypsum-based self-leveling indoor energy-saving terrace system classification: the water heater comprises five types, namely a combined type, an isolated type, a heat preservation plate type, a water heating A type and a water heating B type. The combined type is composed of a base layer, a self-leveling interface agent and a gypsum-based self-leveling mortar terrace; the isolation type is composed of a base layer, an isolation film and a gypsum-based self-leveling mortar terrace; the heat preservation plate type is composed of a base layer, a heat preservation plate, an isolation film and a gypsum-based self-leveling mortar terrace (figure 1); the water heating type A and the water heating type B are composed of a base layer, a heat insulation plate, an isolation film and/or a reflection film, a water heating pipe and a gypsum-based self-leveling mortar terrace.
Different indoor terrace loads correspond to different strength grades and different construction thicknesses of gypsum-based self-leveling mortar.
TABLE 2 thickness of combined or isolated gypsum-based self-leveling mortar terrace under various loads
TABLE 3 thickness of leveling layer of thermal insulation board type under various loads
Example 8
Construction process for exemplifying heat preservation plate type gypsum-based self-leveling mortar energy-saving terrace system
1. Construction conditions are as follows:
the ground temperature and the environment temperature during the construction and the maintenance of the gypsum-based self-leveling mortar terrace are both more than or equal to 5 ℃, and the relative humidity is not higher than 80%.
The gypsum-based self-leveling mortar terrace construction is carried out after the main structure and the ground base layer construction are checked and accepted.
The gypsum-based self-leveling mortar terrace construction adopts special machines. The inorganic materials should be stored in dry, ventilated, damp-proof and rain-proof places.
The construction unit should establish a self-checking and mutual-checking system of each process and a professional staff checking system, and should have a complete construction inspection record. Before the gypsum-based self-leveling mortar terrace project is constructed, a construction scheme is required to be worked out, and technical bottom crossing is required to be carried out according to the construction scheme.
2. The construction process comprises the following steps:
(1) the construction site is communicated with water and electricity, the site is closed, and the cross operation is strictly forbidden;
(2) base layer treatment
The basic level inspection is carried out according to the current national standard GB 50209' construction quality acceptance standard for building ground engineering, and construction can be carried out after acceptance is qualified.
The surface of the base layer must not have the defects of sand, hollowing, shelling, peeling, loosening, rough surface grease, dust, cracks and the like.
The base layer flatness was checked using a 2m running rule. The flatness should not be greater than 4mm/2 m.
The base layer should be a concrete layer or a cement mortar layer, and should be firm and dense. When the base layer is made of concrete, the compressive strength of the base layer is not less than 20 MPa; when the base layer is cement mortar, the compressive strength of the base layer is not less than 15 MPa. If the strength is lower than the value, reinforcement treatment or re-construction should be adopted.
The water content of the base layer is not more than 8%.
The ground construction is carried out after the protection treatment is carried out on the detailed structures such as the connecting part of the floor and the wall surface, the sleeve penetrating the floor (ground) surface and the like.
The moisture protection of kitchens, toilets and floors directly in contact with the soil without basements underneath should be checked.
When the base layer has cracks, the cracks are cut into 1/3-2/3V-shaped grooves with the width of 10 mm-20 mm and the depth of the base layer in a mechanical cutting mode, and then the repairing materials are used for passing, filling, leveling and sealing.
When the empty drum area of the base layer is less than or equal to lm2When in use, the slurry can be treated by a grouting method; when the hollowing area of the base layer is larger than lm2And in time, the concrete is removed and the construction is repeated.
Before pouring, the heat insulation plate type gypsum-based self-leveling mortar terrace needs to be checked to determine whether the laying, bonding and fixing of the heat insulation plate and the sealing of the joint of the heat insulation plate meet the design requirements. The heat insulation board is prevented from moving and floating during gypsum-based self-leveling mortar construction.
(3) Coating interface agent, sticking pattern paper or wood strip
In order to avoid the water absorption of the base layer and the formation of bubbles on the surface, all the base layers are pretreated by using an interface agent, and the self-leveling gypsum mortar is constructed on the base layer after the interface agent is completely dried. In order to ensure the effect of interface treatment, the second treatment can be carried out, and the self-leveling gypsum mortar can be prepared after being dried. The interface treatment for the smooth base and the poor base is that the first painting is carried out to mix 50% pure water diluted water-based epoxy primer to deeply permeate and solidify the base, after drying, the second painting is carried out to the water-based epoxy primer again, and dried quartz sand (0.3-0.8mm) is fully sprinkled on the fresh water-based epoxy primer until the primer cannot be seen. And (5) after the primer is dried, sucking away the redundant quartz sand by using a dust collector. Other base surface interface treatments with large dry-to-wet variations are as described above. The edge of the basement can be used with anti-expansion elastic adhesive tape.
(4) Manually stirring the self-leveling gypsum mortar, and adding water into a barrel for feeding;
pouring the self-leveling gypsum dry powder into purified water according to the water-powder ratio of about 0.25, and stirring the mixture by using a stirrer until no agglomeration exists. After curing for about 2 minutes, the construction can be carried out after stirring for a short time again, and the construction is finished within 30 minutes.
(5) Pouring self-leveling gypsum mortar to the ground, pasting the insulation board, and cutting the insulation board;
before pouring, the heat insulation plate type gypsum-based self-leveling mortar terrace needs to be checked to determine whether the laying, bonding and fixing of the heat insulation plate and the sealing of the joint of the heat insulation plate meet the design requirements. The heat insulation board is prevented from moving and floating during gypsum-based self-leveling mortar construction. Insulation board type gypsum-based self-leveling mortar terrace, it is not good that the insulation board is fixed can lead to gypsum-based self-leveling mortar to flow to the insulation board underneath, causes the insulation board to float.
(6) The next day, the spraying machine pours the self-leveling gypsum mortar with the thickness of 40-45mm, tests the standard fluidity (150-160 mm) of the self-leveling gypsum mortar on site, and defoams and paves the self-leveling gypsum mortar;
the slurry can be prepared by a mechanical method, the slurry is prepared according to the water-solid ratio of the water consumption of the initial fluidity strictly, and the slurry is fully stirred until the slurry is uniform and has no caking.
The self-leveling gypsum with the thickness of about 5-120mm is prepared at most in one construction. If the construction needs to be performed in multiple times, it should be continuously performed, i.e., wet-on-wet construction. It is necessary to subdivide each construction area and finally to connect them with seamless joints. The mortar is spread by selecting a rubber broom, a defoaming roller, a flat scraper and the like according to the layer thickness. Construction such as tiling, wood flooring, carpet can be performed after 1 day. The self-leveling gypsum just after construction should be protected from adverse environmental effects such as freezing, rainfall, strong sunlight, strong wind, high temperature, and the like. Construction is not suitable when the temperature is higher than 40 ℃ or lower than 5 ℃.
When the slurry is spread, the self-leveling slurry is poured onto the construction surface mechanically according to the requirements of the construction scheme, so that the self-leveling slurry is spread and leveled automatically, and a special sawtooth scraper is used for assisting the slurry to be spread uniformly. After the slurry is spread, a self-leveling defoaming instrument is adopted to deflate and defoam.
Finished product protection should be carried out on the gypsum-based self-leveling mortar terrace after construction is finished.
The foregoing shows and describes the general principles, essential features, and advantageous features of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. The gypsum-based self-leveling mortar is characterized by comprising the following components in percentage by weight:
20-40% of alpha-semi-hydrated gypsum powder fired by desulfurized gypsum;
5-20% of alpha-semi-hydrated gypsum powder fired by natural gypsum;
5-10% of heavy calcium powder;
5-15% of cement;
30-50% of sand;
0.5 to 2 percent of rubber powder;
0.1 to 2 percent of composite additive.
2. The gypsum-based self-leveling mortar is characterized by comprising the following components in percentage by weight:
20-40% of alpha-semi-hydrated gypsum powder fired by desulfurized gypsum;
5-20% of alpha-semi-hydrated gypsum powder fired by natural gypsum;
5-10% of heavy calcium powder;
5-15% of cement;
30-50% of sand;
0.5 to 2 percent of rubber powder;
0.1 to 2 percent of composite additive.
3. The gypsum-based self-leveling mortar of claim 1, wherein the sand is baked river sand or quartz sand.
4. The gypsum-based self-leveling mortar according to claim 1, wherein the composite additive comprises the following components in percentage by weight: 0.1 to 0.5 percent of defoaming agent; 0.1-0.5% of cellulose ether; 0.1 to 0.5 percent of high-efficiency water reducing agent; 0.1 to 0.3 percent of retarder.
5. The gypsum-based self-leveling mortar according to claim 4, which is composed of the following components in percentage by weight:
20-40% of alpha-semi-hydrated gypsum powder fired by desulfurized gypsum;
5-20% of alpha-semi-hydrated gypsum powder fired by natural gypsum;
5-10% of heavy calcium powder;
5-15% of cement;
30-50% of sand;
0.5 to 2 percent of rubber powder;
0.1 to 0.5 percent of defoaming agent;
0.1-0.5% of cellulose ether;
0.1 to 0.5 percent of high-efficiency water reducing agent;
0.1 to 0.3 percent of retarder.
6. Use of the gypsum-based self-leveling mortar of any one of claims 1 to 5 in the preparation of a gypsum-based self-leveling mortar floor.
7. The gypsum-based self-leveling mortar energy-saving terrace system is characterized by sequentially comprising a base layer and a gypsum-based self-leveling mortar layer from bottom to top.
8. The gypsum-based self-leveling mortar energy-saving terrace system according to claim 7, which comprises a base layer, an interface agent and a gypsum-based self-leveling mortar layer from bottom to top in sequence.
9. The gypsum-based self-leveling mortar energy-saving terrace system according to claim 7, which comprises a base layer, a heat insulation layer, an isolation film and a gypsum-based self-leveling mortar layer from bottom to top in sequence.
10. The construction method of the gypsum-based self-leveling mortar energy-saving floor system according to any one of claims 7 to 9, characterized by comprising the following steps:
s1, performing base layer processing;
s2, stirring the gypsum-based self-leveling mortar;
and S3, pouring gypsum-based self-leveling mortar.
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| 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 |
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| CN113235866A (en) * | 2021-06-29 | 2021-08-10 | 凯诺（青岛）新型建材有限公司 | Gypsum is from levelling system |
| CN114014624A (en) * | 2021-12-01 | 2022-02-08 | 富思众诚(北京)科技有限公司 | Method for proportioning gypsum-based self-leveling mortar special for ground heating backfill |
| CN114397201A (en) * | 2021-12-17 | 2022-04-26 | 中建材创新科技研究院有限公司 | Method for determining gypsum self-leveling safe construction thickness |
| CN114397201B (en) * | 2021-12-17 | 2023-12-12 | 中建材创新科技研究院有限公司 | Method for determining self-leveling safe construction thickness of gypsum |
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| CN115286337B (en) * | 2022-07-18 | 2023-08-15 | 贵州磷化绿色环保产业有限公司 | Construction method of pouring phosphogypsum-based sand-free self-leveling mortar and construction surface structure thereof |
| CN115126189A (en) * | 2022-07-19 | 2022-09-30 | 贵州磷化绿色环保产业有限公司 | Construction method and construction surface structure of gypsum-based indoor terrace self-leveling concrete |
| CN115324318A (en) * | 2022-08-15 | 2022-11-11 | 湖南省富民乐建材科技发展有限公司 | Self-leveling material based on foamed cement and gypsum as base materials and leveling method |
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| 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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