CN113683368A

CN113683368A - Mortar board and dry-type floor heating system

Info

Publication number: CN113683368A
Application number: CN202111164923.7A
Authority: CN
Inventors: 孟辉江; 马国栋; 郝建江; 陈占虎; 刘立朋; 杨佳; 李幸展; 乔文静; 石红娟
Original assignee: Hebei Sunsky Deeply Developed Technology Co ltd; Hebei Jinduo Construction Engineering Co ltd
Current assignee: Hebei Sunsky Deeply Developed Technology Co ltd; Hebei Jinduo Construction Engineering Co ltd
Priority date: 2021-09-30
Filing date: 2021-09-30
Publication date: 2021-11-23
Anticipated expiration: 2041-09-30
Also published as: CN113683368B

Abstract

The invention provides a mortar board and a dry-type floor heating system, which belong to the technical field of floor heating construction, wherein the dry-type floor heating system comprises: the supporting structures are paved on the reinforced concrete layer at intervals; the heat insulation layer is provided with a plurality of heat insulation plates; the heat insulation board is laid on the reinforced concrete floor slab; the insulation board is arranged around the support structure; the heat-insulating layer is internally embedded with a ground heating pipe embedding groove; a mortar board laid on an upper surface of the support structure; the dry floor heating system has the advantages of high construction efficiency, small field pollution, good flatness, improvement of user use space, convenience in disassembly and replacement, capability of being continuously constructed with subsequent facing bricks, and reduction of the whole construction period.

Description

Mortar board and dry-type floor heating system

Technical Field

The invention relates to the technical field of floor heating construction, in particular to a mortar board and a dry floor heating system.

Background

The floor heating is short for floor radiation heating, the whole floor is used as a radiator, the whole floor is uniformly heated through a heating medium in a floor radiation layer, and heat is supplied to the indoor through the floor in a radiation and convection heat transfer mode, so that the purpose of comfortable heating is achieved. The heat transfer medium is divided into a water ground heating type and an electric ground heating type according to different heat transfer media, and the heat transfer medium is mainly divided into a dry ground heating type and a wet ground heating type according to different paving structures.

Compared with dry floor heating, the conventional wet floor heating installation and construction process comprises the steps of firstly carrying out foundation leveling on the floor surface of a floor slab, laying an extruded sheet and processing abutted seams, laying a reflective film, placing and fixing a floor heating pipe, pouring fine stone concrete for more than 50mm, still carrying out masonry mortar leveling on the fine stone concrete surface for 30mm-50mm in subsequent house handing-over decoration, and the like, and has the defects of complex procedures, long period, reduction of floor height and space and the like.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to overcome the defects of complicated working procedures, long period and low floor height space of wet floor heating in the prior art, thereby providing a dry floor heating system.

The invention also provides a mortar board.

In order to solve the technical problems, the invention provides a mortar board which comprises the following components in parts by weight,

cement 450-;

sand 450 and 660 portions;

10-100 parts of mineral admixture;

1-60 parts of high-molecular polymer material;

0-15 parts of an additive.

Preferably, the high molecular polymer material includes: redispersible latex powder and polyvinyl alcohol;

optionally, the method includes: 1-50 parts of redispersible latex powder and 1-10 parts of polyvinyl alcohol.

Preferably, the particle size of the sand is 20-140 meshes;

optionally, the method includes: 75-125 parts of sand with the particle size of 20-40 meshes, 325 parts of sand 275-140 meshes and 210 parts of sand 125-140 meshes.

Preferably, the mineral admixture is at least one of mineral powder, silica fume and fly ash.

Preferably, the admixture comprises 0-2 parts of welan gum, 0-5 parts of anti-shrinking agent, 0-2 parts of water reducing agent, 0-2 parts of defoaming agent and 0-10 parts of retarder.

The invention also provides a dry floor heating system, comprising:

the supporting structures are paved on the reinforced concrete layer at intervals;

the heat insulation layer is provided with a plurality of heat insulation plates; the heat insulation board is laid on the reinforced concrete layer; the insulation board is arranged around the support structure; a ground heating pipe is embedded in the heat insulation layer;

and the mortar board is laid on the upper surface of the support structure.

Preferably, the mortar board is the mortar board described in any one of the above.

As a preferred scheme, a reflecting film is arranged on one side, away from the reinforced concrete layer, of the heat insulation layer, and the reflecting film and the heat insulation layer are integrally arranged.

Preferably, the support structure is a wood keel, a graphite plate or a polyurethane plate.

Preferably, the method further comprises the following steps:

the first leveling layer is laid above the reinforced concrete layer, and the first leveling layer is self-leveling mortar; the self-leveling mortar is cement-based mortar;

the second leveling layer is paved on the upper surface of the mortar board;

and the veneer layer is laid on the upper surface of the second leveling layer.

The technical scheme of the invention has the following advantages:

1. the mortar board provided by the invention comprises the following components in parts by weight, cement 450 and 550; sand 450 and 660 portions; 10-100 parts of mineral admixture; 1-60 parts of high-molecular polymer material; 0-15 parts of an additive. According to the invention, through the matching and dosage adjustment of the components, the compression strength and the flexural strength of the mortar board can be improved, the shrinkage rate is reduced, and the warping and cracking of the mortar board are effectively prevented.

The compressive strength and the rupture strength of the mortar board are changed by changing the mixing amount of the cement, and the shrinkage rate of the mortar board is changed by adopting the anti-cracking double-speed cement;

by changing the mixing amount of the mineral admixture, the hydration heat reaction is low due to the low activity of the mineral admixture, so that the mortar board can be effectively prevented from warping and cracking while the strength is improved.

2. According to the mortar board provided by the invention, the flexibility of mortar is improved to a great extent by adding the rubber powder, so that the 28-day flexural strength of the mortar board is more than or equal to 20 MPA.

3. The invention provides a dry floor heating system, which comprises: a support structure, a thermal insulation layer and a mortar board; in the scheme, a floor heating system is formed by erecting mortar boards by adopting the supporting structure, dry construction is performed, the construction efficiency is high, the field pollution is small, the flatness is good, the use space of a user is improved, the disassembly and the replacement are convenient, the continuous construction with subsequent facing bricks can be realized, and the whole construction period is shortened;

certain space is reserved among the heat-insulating layer, the ground heating pipe and the mortar board, so that the facing layer and the mortar board are prevented from being directly stressed, and the cracking resistance and the safety of the system are improved.

The ground heating coil is embedded in the heat insulation layer, so that the thickness of the whole system is reduced, and the construction efficiency is improved.

4. According to the dry-type floor heating system, the reflecting film and the heat-insulating layer are prefabricated into a whole, so that the construction efficiency is improved, and meanwhile, the heat of the floor heating pipe is prevented from radiating downwards through the arrangement of the reflecting film.

5. According to the dry-type floor heating system provided by the invention, the prefabricated mortar board has high flatness and high strength, and can be directly bonded and paved with the wood floor and the ceramic tile by adopting mortar or glue, so that the thickness of the leveling layer can be greatly reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic sectional structure view of the floor heating system of the present invention.

Fig. 2 is a schematic view of a floor heating system of the present invention in a top view.

Description of reference numerals:

1. a reinforced concrete layer; 2. a heat-insulating layer; 3. a reflective film; 4. wood keel; 5. a ground heating pipe; 6. a second leveling layer; 7. a finishing layer; 8. a mortar board; 9. a first leveling layer.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. 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.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

Example 1

In the mortar board provided by the embodiment, the mass ratio of water to the dry mortar board is 0.10; wherein, the composition of the mortar board drier is as follows:

450 kg of cement (high belite crack resistant double-block 42.5 model), 660 kg of sand, 80kg of mineral admixture, 2kg of high polymer and 15kg of admixture; wherein the sand has a particle size of 20-40 meshes and is 125 kg, the sand has a particle size of 40-70 meshes and is 325 kg, and the sand has a particle size of 70-140 meshes and is 210 kg; the mineral admixture is fly ash; the mass ratio of redispersible latex powder (5010N type) to polyvinyl alcohol (2488 cold soluble type) in the high molecular polymer is 3: 1; the mass ratio of the admixture medium temperature wheel rubber (ft-765), the anti-shrinkage agent (P750), the water reducing agent (FOX-C900 model), the defoaming agent (352-B model) and the retarder (citric acid) is 1:2:1:2: 5.

And uniformly mixing all the components of the mortar board dry material, and then uniformly mixing the mortar board dry material with water to obtain the mortar board.

Example 2

In the mortar board provided by the embodiment, the mass ratio of water to the dry mortar board is 0.15; wherein, the composition of the mortar board drier is as follows:

550 kg of cement (42.5 models), 450 kg of sand, 10kg of mineral admixture, 60kg of high polymer and 1kg of admixture; wherein the weight of the sand with the particle size of 20-40 meshes is 75 kilograms, the weight of the sand with the particle size of 40-70 meshes is 275 kilograms, and the weight of the sand with the particle size of 70-140 meshes is 200 kilograms; the mineral admixture is fly ash; the mass ratio of redispersible latex powder (5048H type) in the high molecular polymer and polyvinyl alcohol (2488 cold-soluble type) is 2: 1; the mass ratio of the admixture medium temperature wheel rubber (ft-765), the anti-shrinkage agent (P750), the water reducing agent (FOX-C900 model), the defoaming agent (352-B model) and the retarder (citric acid) is 1:1:1:2: 5.

Example 3

In the mortar board provided by the embodiment, the mass ratio of water to the dry mortar board is 0.2; wherein, the composition of the mortar board drier is as follows:

500 kg of cement (42.5 models), 600 kg of sand, 50kg of mineral admixture, 30kg of high polymer and 8kg of admixture; wherein the sand has 90 kg of sand with the grain diameter of 20-40 meshes, the sand has 280 kg of sand with the grain diameter of 40-70 meshes, and the sand has 130 kg of sand with the grain diameter of 70-140 meshes; the mineral admixture is fly ash; the mass ratio of redispersible latex powder (5048H type) in the high molecular polymer to polyvinyl alcohol (2488 cold-soluble type) is 5: 1; the additive comprises an additive medium temperature wheel rubber (ft-765), an anti-shrinkage agent (P750), a water reducing agent (FOX-C900 model), a defoaming agent (352-B model), and a retarder (white granulated sugar) in a mass ratio of 1:5:1:3: 5.

Example 4

In the mortar board provided by the embodiment, the mass ratio of water to the dry mortar board is 0.18; wherein, the composition of the mortar board drier is as follows:

470 kg of cement (42.5 model), 620 kg of sand, 70kg of mineral admixture, 20kg of high polymer and 3kg of admixture; wherein the grain size of the sand is 100 kg for 20-40 meshes, the grain size of the sand is 300 kg for 40-70 meshes, and the grain size of the sand is 170 kg for 70-140 meshes; the mineral admixture is fly ash; the mass ratio of redispersible latex powder (5048H type) in the high molecular polymer to polyvinyl alcohol (2488 cold-soluble type) is 3: 1; the mass ratio of the admixture medium temperature wheel rubber (ft-765), the anti-shrinkage agent (P750), the water reducing agent (FOX-C900 model), the defoaming agent (352-B model) and the retarder (sodium gluconate) is 2:5:1:3: 3.

Example 5

540 kg of cement (42.5 model), 620 kg of sand, 20kg of mineral admixture, 40kg of high polymer and 12kg of admixture; wherein the sand with the grain diameter of 20-40 meshes is 110 kg, the sand with the grain diameter of 40-70 meshes is 280 kg, and the sand with the grain diameter of 70-140 meshes is 150 kg; the mineral admixture is fly ash; the mass ratio of redispersible latex powder (5048H type) in the high molecular polymer to polyvinyl alcohol (2488 cold-soluble type) is 3: 2; the mass ratio of the admixture medium temperature wheel rubber (ft-765), the anti-shrinkage agent (P750), the water reducing agent (FOX-C900 model), the defoaming agent (352-B model) and the retarder (sodium citrate) is 2:5:1:2: 8.

Comparative example 1

In the mortar board provided by the embodiment, the mass ratio of water to the dry mortar board is 0.1; wherein, the composition of the mortar board drier is as follows:

300 kg of cement (42.5 models), 660 kg of sand, 80kg of mineral admixture, 2kg of high polymer and 15kg of admixture; wherein the sand has a particle size of 20-40 meshes and is 125 kg, the sand has a particle size of 40-70 meshes and is 325 kg, and the sand has a particle size of 70-140 meshes and is 210 kg; the mineral admixture is fly ash; the mass ratio of redispersible latex powder (5048H type) in the high molecular polymer to polyvinyl alcohol (2488 cold-soluble type) is 3: 1; the mass ratio of the admixture medium temperature wheel rubber (ft-765), the anti-shrinkage agent (P750), the water reducing agent (FOX-C900 type), the defoaming agent (352-B type) and the retarder (tartaric acid) is 1:2:1:2: 5.

Comparative example 2

450 kg of cement (42.5 models), 660 kg of sand, 0kg of mineral admixture, 2kg of high polymer and 15kg of admixture; wherein the sand has a particle size of 20-40 meshes and is 125 kg, the sand has a particle size of 40-70 meshes and is 325 kg, and the sand has a particle size of 70-140 meshes and is 210 kg; the mineral admixture is fly ash; the mass ratio of redispersible latex powder (5048H type) in the high molecular polymer to polyvinyl alcohol (2488 cold-soluble type) is 3: 1; the mass ratio of the admixture medium temperature wheel rubber (ft-765), the anti-shrinkage agent (P750), the water reducing agent (FOX-C900 model), the defoaming agent (352-B model) and the retarder (citric acid) is 1:2:1:2: 5.

Examples of the experiments

The mortar boards of the examples and comparative examples of the present invention were subjected to performance tests, in which compressive strength, flexural strength, shrinkage ratio, and slump retention time. The specific detection method of the compressive strength and the flexural strength refers to the standard GB/T17671-1999, and the specific detection method of the shrinkage rate refers to the standard JGJ/T70-2009.

The concrete detection method for the slump loss prevention time comprises the following steps: the mortar expansion degree is not less than 150mm, and the specific detection of the mortar expansion degree refers to the standard GB/T2419-2017.

	28d compressive strength, MPa	28d flexural strength, MPa	Shrinkage ratio%	Slump retention time, min
					Example 1	102.3	20.1	0.05	1h
Example 2	115	22.3	0.1	1h
					Example 3	113.5	22.1	0.1	1h
Example 4	116	22.6	0.1	1h
					Comparative example 1	75	10.3	0.12	45min
Comparative example 2	77	10.5	0.125	45min

In the using process, the mortar dry material is made into a mortar board, and the preparation process comprises the following steps:

cleaning the template;

brushing a release agent;

laying a steel wire mesh, and supporting and fixing the steel wire mesh by a special fixing piece;

preparing high-fluidity mortar according to the proportion of water to mortar board dry materials of 0.14-0.15;

and pouring and mixing the mortar, maintaining and removing the mold to obtain the dry-type mortar board for floor heating.

Example 6

The dry floor heating system that this embodiment provided includes: a support structure; the supporting structure is a wood keel 4, a graphite plate or a polyurethane plate; if the graphite plate is adopted, in order to ensure the strength, a high-density graphite plate is adopted;

in this embodiment, the wood keel 4 is selected, meanwhile, the height of the wood keel 4 is consistent, the flatness requirement deviation is within 1mm, and the wood keel 4 is wood subjected to preservative treatment.

The wood keels 4 are paved on the reinforced concrete layer 1 at intervals, and the height of the wood keels 4 is about 30mm generally; in the installation process, the fixed connection of the wood keel 4 and the reinforced concrete layer 1 is realized through the expansion bolts, and the upper surface of the wood keel 4 is bonded with the mortar board 8 through the structural adhesive.

Further, before the wood keel 4 is laid and fixed, a first leveling layer 9 is laid on the reinforced concrete layer 1, specifically, the first leveling layer 9 is leveled by self-leveling mortar, special self-leveling mortar is mixed, and construction is carried out according to the flatness of the floor of the reinforced concrete layer 1 by 15-30 mm.

An insulating layer 2 is laid on the upper surface of the first leveling layer 9, and the insulating layer 2 is formed by splicing a plurality of insulating plates; the heat insulation board fills the space between the wood keels 4 and props against the wood keels 4; specifically, at the in-process of installation heated board, cut the heated board according to wood joist 4's headspace, later lay the heated board again.

The embedding groove for installing the floor heating pipe 5 is preset on the heat insulation plate, and after the heat insulation plate is laid, the floor heating pipe 5 is embedded in the embedding groove of the heat insulation plate; through laying ground heating coil 5 inside heat preservation 2, reduce whole system thickness, improve the efficiency of construction.

The reflective film 3 is integrally arranged on one side of the heat insulation plate warm floor heating pipe 5, and the reflective film 3 is laid along the shape of the caulking groove; the reflection film 3 and the insulation board are prefabricated into a whole, so that the construction efficiency is improved; meanwhile, the reflecting film 3 is arranged on the heat insulation plate, so that the heat of the floor heating pipe 5 can be prevented from radiating downwards, and the indoor temperature is ensured.

Paving a mortar board 8 on the upper surface of the wood keel 4, wherein in the scheme, the mortar board 8 is prefabricated in any one of the manners of embodiment 1-embodiment 5, and the thickness of the mortar board 8 is about 15 mm; the specific performance parameters are as follows: the compressive strength is more than or equal to 100MPa, the flexural strength is more than or equal to 20MPa, the shrinkage rate is less than or equal to 0.05 percent, the slump loss retaining time is more than or equal to 30min, and the consistency is 40-50 mm.

The mortar board 8 is supported through the wood keel 4, so that a certain space is reserved among the heat-insulating layer 2, the ground heating pipe 5 and the mortar board 8, the stress between the upper layer structure and the upper layer structure is avoided, and the cracking resistance and the safety of the system are improved.

Lay second screed-coat 6 at the upper surface of mortar board 8, second screed-coat 6 is laid by cement and sand and is formed, and the thickness of second screed-coat 6 is about 10mm, lays finish coat 7 at the upper surface of second screed-coat 6.

In this scheme, the prefabricated mortar board 8 that adopts wood joist 4 to erect constitutes and warms up system structure layer, whole process dry-type construction operation, and the efficiency of construction is high, and the on-the-spot pollution is little, and the roughness is good, improves user's usage space, and the dismouting is changed conveniently, can with follow-up finish coat 7 serialization construction, reduces whole system construction cycle.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims

1. A mortar board is characterized by comprising the following components in parts by weight,

cement 450-;

sand 450 and 660 portions;

10-100 parts of mineral admixture;

1-60 parts of high-molecular polymer material;

0-15 parts of an additive.

2. The mortar board of claim 1, wherein the high molecular polymer material comprises: redispersible latex powder and polyvinyl alcohol;

3. The mortar board of claim 1, wherein the sand has a particle size of 20-140 mesh;

4. The mortar board of claim 1, wherein the mineral admixture is at least one of mineral powder, silica fume, fly ash.

5. The mortar board according to claim 1, wherein the admixture comprises 0-2 parts of welan gum, 0-5 parts of anti-shrinkage agent, 0-2 parts of water reducing agent, 0-2 parts of defoaming agent and 0-10 parts of retarder.

6. A dry floor heating system, comprising:

and the mortar board is laid on the upper surface of the support structure.

7. The dry floor heating system of claim 6, wherein the mortar board is the mortar board of any one of claims 1-5.

8. A dry floor heating system as claimed in claim 6, wherein a reflective film is provided on the side of the insulation layer remote from the layer of reinforced concrete, the reflective film being integral with the insulation layer.

9. The dry floor heating system of claim 6, wherein the support structure is a wood keel, a graphite plate, or a polyurethane plate.

10. The dry floor heating system of claim 6, further comprising:

the first leveling layer is laid above the reinforced concrete layer and is made of self-leveling mortar;

the second leveling layer is paved on the upper surface of the mortar board;

and the veneer layer is laid on the upper surface of the second leveling layer.