CN111648554A - Anti-cracking ground filling leveling layer and construction method thereof - Google Patents
Anti-cracking ground filling leveling layer and construction method thereof Download PDFInfo
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- CN111648554A CN111648554A CN202010621753.XA CN202010621753A CN111648554A CN 111648554 A CN111648554 A CN 111648554A CN 202010621753 A CN202010621753 A CN 202010621753A CN 111648554 A CN111648554 A CN 111648554A
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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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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F15/00—Flooring
- E04F15/18—Separately-laid insulating layers; Other additional insulating measures; Floating floors
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F15/00—Flooring
- E04F15/18—Separately-laid insulating layers; Other additional insulating measures; Floating floors
- E04F15/20—Separately-laid insulating layers; Other additional insulating measures; Floating floors for sound insulation
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F15/00—Flooring
- E04F15/18—Separately-laid insulating layers; Other additional insulating measures; Floating floors
- E04F15/20—Separately-laid insulating layers; Other additional insulating measures; Floating floors for sound insulation
- E04F15/203—Separately-laid layers for sound insulation
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F2290/00—Specially adapted covering, lining or flooring elements not otherwise provided for
- E04F2290/04—Specially adapted covering, lining or flooring elements not otherwise provided for for insulation or surface protection, e.g. against noise, impact or fire
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F2290/00—Specially adapted covering, lining or flooring elements not otherwise provided for
- E04F2290/04—Specially adapted covering, lining or flooring elements not otherwise provided for for insulation or surface protection, e.g. against noise, impact or fire
- E04F2290/041—Specially adapted covering, lining or flooring elements not otherwise provided for for insulation or surface protection, e.g. against noise, impact or fire against noise
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Floor Finish (AREA)
Abstract
The invention belongs to the technical field of construction of filling leveling layers, and particularly relates to an anti-cracking ground filling leveling layer and a construction method thereof. The ground filling leveling layer comprises a three-dimensional grid arranged on a base layer and a mortar or concrete layer formed by paving mortar or concrete on the base layer; the mortar or concrete layer coats the three-dimensional grid, and the three-dimensional grid is made of high molecular polymers. The invention combines the three-dimensional grid with the high-fluidity filling leveling material, avoids the warping and cracking on the premise of not reducing the bearing capacity of the filling leveling layer and not arranging expansion joints, realizes large-area seamless filling, and ensures the surface flatness and quality of the filling leveling layer.
Description
Technical Field
The invention belongs to the technical field of construction of filling leveling layers, and particularly relates to an anti-cracking ground filling leveling layer and a construction method thereof.
Background
The traditional ground material has volume change in the hydration and drying processes, the size change rate is usually 0.1-0.3%, the ground filling leveling layer is easy to crack, and the warping and cracking tendency of the ground is increased along with the increase of the thickness. In order to avoid warping and cracking of the ground, expansion joints are required to be arranged in the ground filling leveling layer every 4-6 m span in the traditional disposal method. The cracking prevention effect of the traditional method is limited, and if the surface of the filling leveling layer is provided with an integral surface layer which is self-leveling, the integral surface layer is very easy to crack at the expansion joint, so that the effect of the integral surface layer is influenced.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an anti-cracking filling leveling layer and a construction method thereof. The invention combines the three-dimensional grid with the high-fluidity filling leveling material, avoids warping and cracking on the premise of not reducing the bearing capacity of the filling leveling layer and not arranging expansion joints, realizes large-area seamless filling, ensures the surface flatness and the filling quality of the filling leveling layer, and simultaneously tests prove that the filling leveling layer has certain effects of improving ground heat preservation and sound insulation.
Specifically, the present invention provides the following technical solutions.
The anti-cracking ground filling leveling layer comprises a three-dimensional grid arranged on a base layer and a mortar or concrete layer formed by laying mortar or concrete on the base layer; the mortar or concrete layer coats the three-dimensional grid, and the three-dimensional grid is made of high molecular polymers.
Preferably, in the ground filling leveling layer, the mesh shape of the three-dimensional grid is regular hexagon or square.
Preferably, in the ground filling leveling layer, the hole center distance between adjacent meshes in the three-dimensional grid is 20-60 mm.
Preferably, in the ground filling leveling layer, the vertical height of the three-dimensional grid relative to the base layer is 20-50 mm, and more preferably, the vertical height of the three-dimensional grid relative to the base layer is 0-1 mm lower than that of the mortar or concrete layer.
Preferably, in the ground filling leveling layer, the material of the three-dimensional grid is a high molecular polymer with an elastic modulus E of 0.5-10.0 GPa, and the three-dimensional grid has good compatibility with the ground filling material, and is further preferably ultrahigh molecular weight polyethylene.
Preferably, in the ground filling leveling layer, the thickness of the grid wall of the three-dimensional grid is 0.5-1.5 mm.
Preferably, in the ground filling leveling layer, the 30-minute fluidity of the mortar or the concrete is not less than 120mm, the compressive strength of the mortar or the concrete is not less than 15MPa, and more preferably, the mortar or the concrete is fine aggregate concrete with the aggregate grain diameter not more than 3mm, ground mortar with the aggregate grain diameter not more than 3mm or self-leveling mortar.
The invention also provides a construction method of the ground filling leveling layer, which comprises the following steps:
(1) coating an emulsion type interface treating agent on the surface of the base layer for sealing treatment;
(2) placing a plurality of prefabricated three-dimensional grid structural members on the surface of a base layer, adjusting the surface height of the three-dimensional grid structural members, and enabling different three-dimensional grid structural members to be located on the same horizontal plane and to be spliced with each other to obtain a three-dimensional grid, wherein the three-dimensional grid structural members are made of high polymer;
(3) and (3) pouring concrete or mortar on the surface of the base layer in the step (2) to form mortar or a concrete layer, so as to obtain the filling leveling layer, wherein the height of the mortar or the concrete layer is not less than that of the three-dimensional grid.
Preferably, in the above construction method, in the step (3), after the pouring is completed, a post-treatment of trowelling is further included.
The invention has the following beneficial effects:
(1) the three-dimensional grids can increase the toughness of the ground filling leveling layer, improve the adaptability to structural deformation and improve the crack resistance of the ground filling leveling layer;
(2) the traditional ground filling leveling layer is easy to generate internal stress during integral casting, and the leveling system is easy to crack;
(3) the three-dimensional grid and the high-fluidity mortar are combined to form the filling leveling layer of the ground, no expansion joint is needed, and the construction is simple and rapid;
(4) the invention has the characteristics of no expansion joint and cracking resistance, can further improve the quality of the ground facing layer, avoids the damage of the ground facing layer caused by cracking of the leveling layer, and provides more choices for the facing layer;
(5) compared with the traditional ground filling method, the ground filling leveling layer has the advantages that the ground heat transfer coefficient is reduced by 6%, and the sound insulation effect is improved by 7%;
(6) the three-dimensional grid can be cut and laid according to the shape of the floor of a room, and the construction is flexible and the adaptability is stronger.
Drawings
Fig. 1 is a schematic structural view of a three-dimensional honeycomb grid structure according to example 1.
FIG. 2 is a graph showing the results of the dimensional change rate test of the first sample in the test example.
FIG. 3 is a graph showing the results of the dimensional change rate test of the second sample in the experimental example.
Detailed Description
The present invention will be described in further detail with reference to specific examples, but the scope of the present invention is not limited thereto. The ultra-high molecular weight polyethylene plastic (UHMW-PE) is purchased from Jiangsu Zhongjiang polymer Co., Ltd, the self-leveling mortar (SL U C25F6) is purchased from Beijing golden corner mortar Co., Ltd, the self-leveling mortar has the fluidity of 143mm in 30 minutes, the special concrete emulsion interface agent (permeable water emulsion series) is purchased from Beijing Pluronic New technology Co., Ltd, and other auxiliary materials are conventional products which can be purchased through normal channels.
Example 1
Embodiment 1 provides a construction method of an anti-cracking indoor ground filling leveling layer, which includes the following steps:
(1) sealing the base layer by using a special concrete emulsion interface agent;
(2) the wall root part contacted with the base layer is flexibly isolated by a soft material foam board with the thickness of 30mm and the height of 50 mm;
(3) prefabricating a honeycomb three-dimensional grid structural member shown in figure 1 by using ultra-high molecular weight polyethylene as a material, wherein the mesh shape of the honeycomb three-dimensional grid structural member is a regular hexagon, the center distance of holes is 50mm, the height is 30mm, and the wall thickness is 1 mm;
(4) laying a plurality of honeycomb three-dimensional grid structural members prefabricated in the step (3) on the surface of a floor slab and splicing the honeycomb three-dimensional grid structural members with each other to enable the three-dimensional grids to be fully distributed on the whole base layer;
(5) in order to avoid the dislocation and floating of the three-dimensional grid, the bottom of the honeycomb three-dimensional grid structural member and the base layer are fixed by a shooting nail;
(6) mixing self-leveling mortar and water in a ratio of 1: 0.22, mixing and stirring, pumping self-leveling slurry to a pipeline through a pumping machine, pumping the slurry to the surface of a base layer on which the three-dimensional grid is laid through the pipeline, and automatically filling high-fluidity slurry into the meshes of the honeycomb three-dimensional grid structure under the action of gravity until the slurry is filled to be basically consistent with the height of the three-dimensional grid;
(7) spreading the slurry in the same direction before thickening the slurry to be smooth by using a bubble removing roller;
(8) standing until the self-leveling mortar is hardened and dried to obtain the filling leveling layer, and carrying out the next construction.
Test examples
The cement-based self-leveling mortar shrinks along with the increase of age, the shrinkage is the most main reason for causing ground cracking, and the change rate of the size of the cement-based self-leveling mortar is respectively tested by adopting an easy-to-execute German contraction instrument:
sample one: mixing cement self-leveling mortar with water, directly pouring the mixture into a groove of a size change rate tester, and carrying out digital display recording through the displacement of a movable plate of a contraction instrument in the length direction of a test piece to finish the size change rate test, wherein a test result curve is shown in figure 2;
sample two: the three-dimensional grids described in embodiment 1 are laid in the grooves in advance, the same cement self-leveling mortar is uniformly mixed according to the first test water addition amount, and then poured into the grooves of the size change rate tester for size change rate test, and the test result curve is shown in fig. 3.
The comparison of the test results of fig. 2 and fig. 3 shows that the dimensional change rate of the untreated cement-based self-leveling mortar is about-0.2%, and the dimensional change rate of the cement-based self-leveling mortar treated by the three-dimensional grid is about-0.05%, which shows that the three-dimensional grid has obvious effect on reducing the dimensional change rate and has obvious effect on preventing the ground from cracking.
Comparative example 1
Comparative example 1 provides a traditional ground filling screed-coat construction method, comprising the steps of:
(1) sealing the base layer by using a special interface agent;
(2) the wall root part contacted with the base layer is flexibly isolated by a soft material foam board with the thickness of 30mm and the height of about 50 mm;
(3) mixing self-leveling mortar and water in a ratio of 1: 0.22 mixing and stirring, filling and leveling, and arranging separation seams, wherein the longitudinal and transverse intervals of the separation seams are 6 m;
(4) spreading the slurry in the same direction before thickening the slurry to be smooth by using a bubble removing roller;
(5) standing until the self-leveling mortar is hardened and dried to obtain the filling leveling layer, and carrying out the next construction.
Table 1 shows a comparison of the properties of the floor systems obtained by the filling and leveling method of example 1 and comparative example 1, respectively. As can be seen from Table 1, compared with the traditional ground filling method, the ground filling leveling layer provided by the invention has the advantages that the ground heat transfer coefficient is reduced by 6%, and the sound insulation effect is improved by 7%.
Table 1 comparison of performance of ground systems with filled screed according to different methods
| Item | Average equivalent heat transfer coefficient w/m2.K | Air sound weighting sound insulation quantity (dB) |
| Example 1 | 0.353 | 43 |
| Comparative example 1 | 0.376 | 46 |
Although the invention has been described in detail hereinabove by way of general description, specific embodiments and experiments, it will be apparent to those skilled in the art that many modifications and improvements can be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. The anti-cracking ground filling leveling layer is characterized by comprising a three-dimensional grid arranged on a base layer and a mortar or concrete layer formed by paving mortar or concrete on the base layer; the mortar or concrete layer coats the three-dimensional grid, and the three-dimensional grid is made of high molecular polymers.
2. The ground-filling screed according to claim 1, wherein the mesh shape of the three-dimensional grid is a regular hexagon or a square.
3. The ground filling leveling layer according to claim 1 or 2, wherein the hole center distance of adjacent mesh holes in the three-dimensional grid is 20-60 mm.
4. The ground-filled leveling layer according to any one of claims 1 to 3, wherein the vertical height of the three-dimensional grid relative to the base layer is 20-50 mm.
5. The ground-filled balancing layer according to claim 4, wherein the vertical height of the three-dimensional grid relative to the base layer is 0-1 mm lower than the mortar or concrete layer.
6. The ground-filling leveling layer according to any one of claims 1 to 5, wherein the material of the three-dimensional grid is a high molecular polymer with an elastic modulus E of 0.5-10.0 GPa, preferably ultra-high molecular weight polyethylene.
7. The ground filling leveling layer according to any one of claims 1 to 6, wherein the three-dimensional grid has a grid wall thickness of 0.5 to 1.5 mm.
8. The ground filling leveling layer according to any one of claims 1 to 7, wherein the 30-minute fluidity of the mortar or concrete is not less than 120mm, the compressive strength of the mortar or concrete is not less than 15MPa, and preferably, the mortar or concrete is fine aggregate concrete with an aggregate particle size of not more than 3mm, ground mortar with an aggregate particle size of not more than 3mm or self-leveling mortar.
9. The method of applying a filled screed according to any one of claims 1 to 8, which comprises the steps of:
(1) coating an emulsion type interface treating agent on the surface of the base layer for sealing treatment;
(2) placing a plurality of prefabricated three-dimensional grid structural members on the surface of a base layer, adjusting the surface height of the three-dimensional grid structural members, and enabling different three-dimensional grid structural members to be located on the same horizontal plane and to be spliced with each other to obtain a three-dimensional grid, wherein the three-dimensional grid structural members are made of high polymer;
(3) and (3) pouring concrete or mortar on the surface of the base layer in the step (2) to form mortar or a concrete layer, so as to obtain the filling leveling layer, wherein the height of the mortar or the concrete layer is not less than that of the three-dimensional grid.
10. The construction method according to claim 9, wherein in the step (3), after the pouring is completed, a floating post-treatment is further included.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112252118A (en) * | 2020-10-16 | 2021-01-22 | 魏恒业 | Structure improvement technology of plastic track |
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| CN102826814A (en) * | 2012-09-25 | 2012-12-19 | 湖南交泰建材有限公司 | Cement-based self-leveling mortar |
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Cited By (1)
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| CN112252118A (en) * | 2020-10-16 | 2021-01-22 | 魏恒业 | Structure improvement technology of plastic track |
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| CN111648554B (en) | 2021-12-14 |
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