CN115557761A - Anti-crack ground structure and preparation method thereof - Google Patents
Anti-crack ground structure and preparation method thereof Download PDFInfo
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- CN115557761A CN115557761A CN202211240620.3A CN202211240620A CN115557761A CN 115557761 A CN115557761 A CN 115557761A CN 202211240620 A CN202211240620 A CN 202211240620A CN 115557761 A CN115557761 A CN 115557761A
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- silicon dioxide
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- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 63
- 239000004567 concrete Substances 0.000 claims abstract description 56
- 239000002002 slurry Substances 0.000 claims abstract description 53
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 229920005610 lignin Polymers 0.000 claims abstract description 29
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 29
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 26
- 235000007164 Oryza sativa Nutrition 0.000 claims abstract description 17
- 235000009566 rice Nutrition 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 14
- 239000000126 substance Substances 0.000 claims abstract description 14
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 11
- 239000004568 cement Substances 0.000 claims abstract description 9
- 239000004570 mortar (masonry) Substances 0.000 claims abstract description 6
- 239000011398 Portland cement Substances 0.000 claims abstract description 5
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 5
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims abstract description 5
- 239000000203 mixture Substances 0.000 claims abstract description 5
- 239000004576 sand Substances 0.000 claims abstract description 5
- 238000011065 in-situ storage Methods 0.000 claims abstract description 4
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 22
- 241000209094 Oryza Species 0.000 claims description 16
- 239000000395 magnesium oxide Substances 0.000 claims description 12
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 12
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 12
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 11
- 239000010410 layer Substances 0.000 claims description 11
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical group [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 239000002344 surface layer Substances 0.000 claims description 9
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 8
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 7
- 238000004140 cleaning Methods 0.000 claims description 6
- 239000012670 alkaline solution Substances 0.000 claims description 5
- 239000002270 dispersing agent Substances 0.000 claims description 5
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical group CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 claims description 4
- 239000003792 electrolyte Substances 0.000 claims description 4
- 235000010413 sodium alginate Nutrition 0.000 claims description 4
- 229940005550 sodium alginate Drugs 0.000 claims description 4
- 239000000661 sodium alginate Substances 0.000 claims description 4
- 150000001720 carbohydrates Chemical class 0.000 claims description 3
- 235000014633 carbohydrates Nutrition 0.000 claims description 3
- 230000007935 neutral effect Effects 0.000 claims description 3
- CHWRSCGUEQEHOH-UHFFFAOYSA-N potassium oxide Chemical compound [O-2].[K+].[K+] CHWRSCGUEQEHOH-UHFFFAOYSA-N 0.000 claims description 3
- 229910001950 potassium oxide Inorganic materials 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 1
- 239000006185 dispersion Substances 0.000 abstract description 11
- 230000006355 external stress Effects 0.000 abstract description 2
- 230000035515 penetration Effects 0.000 abstract description 2
- 240000007594 Oryza sativa Species 0.000 abstract 1
- 238000010276 construction Methods 0.000 description 12
- 238000005336 cracking Methods 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 4
- 239000000835 fiber Substances 0.000 description 4
- 230000036571 hydration Effects 0.000 description 4
- 238000006703 hydration reaction Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 239000002994 raw material Substances 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 238000010790 dilution Methods 0.000 description 2
- 239000012895 dilution Substances 0.000 description 2
- 238000010410 dusting Methods 0.000 description 2
- 238000009415 formwork Methods 0.000 description 2
- 239000011440 grout Substances 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 238000003776 cleavage reaction Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 230000007017 scission Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000003469 silicate cement Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- 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
- C04B28/02—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 hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
- C04B28/065—Calcium aluminosulfate cements, e.g. cements hydrating into ettringite
-
- 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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/40—Compounds containing silicon, titanium or zirconium or other organo-metallic compounds; Organo-clays; Organo-inorganic complexes
- C04B24/42—Organo-silicon compounds
- C04B24/425—Organo-modified inorganic compounds, e.g. organo-clays
-
- 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
-
- 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
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/60—Flooring materials
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Dispersion Chemistry (AREA)
- Civil Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a preparation method of an anti-crack ground structure, wherein concrete slurry automatically levels in a template plane space under the action of self weight during pouring, and the concrete slurry comprises the following substances: the concrete mortar comprises portland cement, sulphoaluminate cement, sand, hydrophilic flaky flexible biological aggregate with a water guide network, a water reducing agent, an expanding agent and an alkaline substance for adjusting the concrete mortar to be alkaline; the flexible biological aggregate in the concrete slurry is a composition of lignin and silicon dioxide, and the lignin and the silicon dioxide keep an in-situ connection structure in the rice hull; the lignin and the silicon dioxide are both connected with hydroxyl; wherein lignin and silicon dioxide of the flexible biological aggregate are dispersed in the slurry to form a cementing network in the concrete setting process; the invention utilizes the penetration of the flexible biological skeleton formed in the slurry space along with the dispersion of water in the slurry to the obtained ground structure to form the effective dispersion of external stress, thereby improving the crack resistance of the ground structure obtained by the invention.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to an anti-cracking ground structure and a preparation method thereof.
Background
According to the specification of GB50209, the deviation of the flatness of the integral surface layer of the fine aggregate concrete is 5mm according to the acceptance standard of construction quality of building ground engineering-article No. 5.1.7, the integral surface layer of the fine aggregate concrete floor is formed in one step by manual integral construction, the range exceeds the specified range of the specification of 5mm, and the flatness is very difficult to be precise every 1 mm. The reasons for low ground flatness are many, and the flatness is probably reduced due to larger aggregate particles; also probably during the surface course construction of building ground such as factory building, warehouse, underground garage, ponding often appears on ground, and when current concrete grout pours, can inhale above-mentioned ponding, lead to the water-cement ratio of concrete grout to be destroyed, and stability can change to lead to the ground after the solidification, position intensity is high for a bit, and position intensity is low for a bit, appears the phenomenon of pot hole depression very easily when using.
Disclosure of Invention
The invention aims to provide a preparation method of an anti-cracking ground structure, which utilizes the penetration of a flexible biological skeleton formed in the slurry along with the dispersion of water in the slurry space to the obtained ground structure to form effective dispersion of external stress and improve the anti-cracking performance of the ground structure.
In order to solve the technical problem, the technical scheme of the invention is as follows: a preparation method of an anti-crack ground structure is characterized in that concrete slurry automatically levels in a formwork plane space under the action of self weight during pouring, and the concrete slurry comprises the following substances:
the concrete mortar comprises portland cement, sulphoaluminate cement, sand, hydrophilic flaky flexible biological aggregate with a water guide network, a water reducing agent, an expanding agent and an alkaline substance for adjusting the concrete mortar to be alkaline;
the flexible biological aggregate in the concrete slurry is a composition of lignin and silicon dioxide, and the lignin and the silicon dioxide keep an in-situ connection structure in the rice hull;
in the pouring process, water from concrete slurry or water in an external environment is uniformly dispersed by taking lignin in the flaky flexible biological aggregate as a water guide network;
the lignin and the silicon dioxide are both connected with hydroxyl;
wherein the lignin and silica of the flexible biological aggregate are dispersed in the slurry to form a cementitious network during the setting of the concrete.
Preferably, the concrete slurry comprises the following materials in parts by weight:
the concrete slurry forms a ground structure, has certain requirements on the flatness of the obtained surface layer, reduces the use of rigid aggregate, and replaces sheet-shaped flexible biological aggregate which can be dissolved in an alkaline solution system, the flexible biological aggregate forms a uniformly and continuously distributed cementing network along with the water dispersion in the system, the continuity of an internal structure is increased due to the existence of the continuous flexible biological aggregate between the whole structures after the surface layer structure is coagulated, and cracks are difficult to develop due to the obstruction of the continuous network once the surface layer structure is subjected to external action with larger damage, so that the anti-cracking performance of the ground is formed.
Preferably, the alkaline substance is sodium hydroxide or potassium oxide. The alkaline substance is easy to dissolve, the alkaline solution is formed to dissolve the flexible biological skeleton, and the fluidity of the obtained concrete slurry and the stability after coagulation and drying are improved.
Preferably, the preparation method of the flexible biological aggregate comprises the following steps:
firstly, cleaning and drying rice hulls with sheet structures;
step two, placing the dried rice hulls in 1M hydrochloric acid or sulfuric acid to remove carbohydrates in the rice hulls, keeping the rice hulls to have a connection structure of lignin and silicon dioxide, cleaning to be neutral, and drying; obtaining the flexible biological aggregate dissolved in the alkaline solution. The invention effectively maintains the flaky connecting structure of lignin and silicon dioxide, and is used as a cementing network for the partitioned positioning of the flaky structure. The silicon dioxide of each piece of flexible biological aggregate connected with the lignin also participates in the hydration of cement together to form calcium silicate hydrate and the like, and the lignin connected with the silicon dioxide is utilized to strengthen the internal connection of the surface layer structure, so that the crack resistance of the obtained ground structure is improved. The ground structure is condensed and dried by SiO in sol 2 As a result of agglomeration of the particles with each other; when the water content in the silica sol is gradually reduced to make the silica sol concentratedWhen the degree is increased, the collision probability among colloid particles is increased, and the particles are more prone to be mutually adhered and gathered.
Preferably, the concrete slurry further comprises 2 to 5 parts by mass of an electrolyte having a chain structure as a dispersant. According to the invention, the chain structure of the dispersing agent is matched with the sheet-shaped flexible biological skeleton, silicon dioxide contained in the sheet-shaped structure is matched for dispersion, meanwhile, the chain electrolyte realizes the effect of forming steric hindrance on local electrostatic induction of the sheet-shaped flexible biological skeleton, charges with the same electrical property are induced by utilizing the static electricity, materials repel each other due to the same electrical property, mutual obstruction of the materials is formed, sedimentation and layering of particles with larger mass in slurry are prevented, and the defects of hollowing and the like are reduced.
Preferably, the dispersing agent is sodium alginate. The sodium alginate has a chain structure, is suitable for forming matching with the flaky flexible biological aggregate in a space range, is beneficial to the dispersion of water, is realized in a certain space area by utilizing the charge electrostatic induction of the electrolyte, is beneficial to the uniform dispersion of the slurry, and is stable.
Preferably, the expanding agent comprises magnesium oxide and nano calcium carbonate; the mass ratio of the two is (2-3): (1-2). The invention limits the mass ratio of the magnesium oxide to the nano calcium carbonate, improves the stability of the obtained slurry and is beneficial to the formation of a ground structure.
The invention also aims to provide the anti-cracking ground structure, the obtained ground structure is formed by self-leveling of concrete slurry, the preparation method is simple and convenient, the surface of the obtained structure is flat, and the mechanical property is improved.
In order to solve the technical problem, the technical scheme of the invention is as follows: the invention provides a ground structure prepared by the preparation method.
Preferably, the ground structure is one of surface layers of floors in factory buildings, warehouses and underground garages;
or a leveling layer for a floor coating top.
Preferably the thickness of the face or screed is less than 20mm.
By adopting the technical scheme, the invention has the beneficial effects that:
the concrete slurry automatically levels in the plane space of the template by utilizing the self-weight action during pouring, and compared with the prior art that short fibers are added into the concrete slurry to improve the strength of the ground structure, the short fibers play a great role in tensile strength and bending strength in the initial stage of loading under the action of the internal force of the concrete, so that the toughness of the concrete is greatly improved. In the traditional anti-cracking measure, a steel wire mesh is added to improve the dry shrinkage crack and the plastic crack of concrete, and CN106565158B proposes that fibers are doped into the concrete to replace a steel bar mesh, and simultaneously, the mechanical strength is ensured;
the invention utilizes substances such as silicate cement, sulphoaluminate cement, silicon dioxide, calcium oxide, magnesium oxide, aluminum oxide and the like in the concrete slurry and silicon dioxide serving as flexible biological aggregate to form hydration to construct an integrated structure, the silicon dioxide regularly connected on the flexible biological aggregate lignin is matched with the hydration process of the cement to obtain the internal network connection of a ground structure, and the flexible biological skeleton is used as a basic connecting unit to further combine the hydration of the concrete slurry to develop into a structural layer with a complete connecting network inside; the lignin and the silicon dioxide of the flaky flexible biological aggregate are both connected with hydroxyl groups, and a cementing network in the concrete setting process is formed in the slurry by matching with the dispersion of water in the slurry;
when water accumulates on the ground in the construction process of the concrete slurry or water is added for dilution and matched construction during construction, water from different sources is easy to rapidly disperse through hydrophilic lignin and silicon dioxide of the flexible biological aggregate in the slurry to form a water dispersion path when contacting the prepared slurry, and the slurry obtained by the invention is stable and has good binding power, so that an anti-crack ground layer and a bottom layer where the anti-crack ground layer is positioned are prevented from being easily layered, and hollowing and cracking are avoided;
after the construction is finished and cured, the slurry has small rigid aggregate consumption and low dry density, can still maintain good crack resistance even if materials such as an anti-cracking steel mesh and the like are not used, and avoids the dusting and the sanding caused by the sinking of the aggregate in the obtained ground structure.
Detailed Description
In order to further explain the technical solution of the present invention, the present invention is explained in detail by the following specific examples.
Example 1
The embodiment discloses a preparation method of a flexible biological aggregate, which comprises the following steps:
firstly, cleaning and drying rice hulls with sheet structures;
step two, placing the dried rice hulls in 1M hydrochloric acid or sulfuric acid to remove carbohydrates in the rice hulls, keeping the rice hulls to have a connection structure of lignin and silicon dioxide, cleaning to be neutral, and drying;
wherein the solid-liquid ratio of the rice hull to the hydrochloric acid or the sulfuric acid is 1.
Obtaining the flexible biological aggregate dissolved in the alkaline solution.
Example 2
The embodiment discloses a preparation method of an anti-crack ground structure, wherein concrete slurry automatically levels in a formwork plane space under the action of self weight during pouring, and the concrete slurry comprises the following substances:
portland cement, sulphoaluminate cement, sand, the hydrophilic flaky flexible biological aggregate with the water guide network prepared in the embodiment 1, a water reducing agent, an expanding agent and an alkaline substance for adjusting the concrete slurry to be alkaline;
the flexible biological aggregate in the concrete slurry is a composition of lignin and silicon dioxide, and the lignin and the silicon dioxide keep an in-situ connection structure in the rice hull; in the pouring process, water from concrete slurry or water in an external construction environment is uniformly dispersed by taking lignin in the flaky flexible biological aggregate as a water guide network; the lignin and the silicon dioxide are both connected with hydroxyl; wherein the lignin and silica of the flexible biological aggregate are dispersed in the slurry to form a cementitious network during the setting of the concrete.
The mass parts of the materials in the concrete slurry described in this example are shown in table 1.
The alkaline substance is sodium hydroxide or potassium oxide.
The expanding agent in the embodiment comprises magnesium oxide and nano calcium carbonate, and the mass ratio of the magnesium oxide to the nano calcium carbonate is 2:1.
Example 3
The main differences between this embodiment and embodiment 2 are:
the component amounts of the raw materials are shown in table 1;
the expanding agent in the embodiment comprises magnesium oxide and nano calcium carbonate, and the mass ratio of the magnesium oxide to the nano calcium carbonate is 1:1.
Example 4
The main differences between this embodiment and embodiment 2 are:
the component amounts of the raw materials are shown in table 1;
the expanding agent in the embodiment comprises magnesium oxide and nano calcium carbonate, and the mass ratio of the magnesium oxide to the nano calcium carbonate is 1:1.
Example 5
The main differences between this embodiment and embodiment 2 are:
the component amounts of the raw materials are shown in table 1;
the expanding agent in the embodiment comprises magnesium oxide and nano calcium carbonate, and the mass ratio of the magnesium oxide to the nano calcium carbonate is 3:2.
Table 1 concrete paste compositions (parts by mass) obtained in examples 2 to 5
| Item | Example 2 | Example 3 | Example 4 | Example 5 |
| Portland cement | 180 | 220 | 250 | 200 |
| Sulphoaluminate cement | 160 | 140 | 120 | 150 |
| Sand | 40 | 50 | 60 | 70 |
| Flexible biological aggregate | 5 | 10 | 15 | 20 |
| Water reducing agent | 5 | 10 | 15 | 10 |
| Expanding agent | 35 | 15 | 25 | 20 |
| Alkaline substance | 30 | 10 | 20 | 20 |
| Water (W) | 100 | 110 | 120 | 130 |
| Sodium alginate | 2 | 2 | 5 | 5 |
Comparative example
The main differences between this comparative example and example 4 are as follows:
the concrete slurry comprises the following materials in parts by weight:
for concrete cube structures of different sizes of the slurries obtained in examples 2 to 5 and comparative examples, referring to "standard of concrete physical and mechanical property test method" GB/T50081-2019, the elastic modulus, cube compressive strength and split tensile strength of the concrete for 28 days are measured by tests, wherein the size of the elastic modulus test block is 150mm × 150mm × 300mm, the size of the cube compressive strength and split tensile strength test block is 150mm × 150mm × 150mm, and specific numerical indexes are shown in table 2.
TABLE 2 mechanical Properties of cubic structures obtained in examples 2 to 5 corresponding to the slurries
| Item | Modulus of elasticity/GPa | Compressive strength/MPa | Tensile strength at cleavage/MPa |
| Example 2 | 21.2 | 41.2 | 3.00 |
| Example 3 | 21.8 | 41.9 | 3.12 |
| Example 4 | 24.5 | 45.6 | 3.56 |
| Example 5 | 22.3 | 43.8 | 3.28 |
| Comparative example | 19.6 | 35.5 | 2.26 |
The concrete obtained by the invention has remarkable mechanical properties because the polypropylene fiber is used in the comparative example to improve the bending resistance, the concrete obtained by the invention has excellent anti-cracking performance, the fluidity is 235mm to 245mm, and meanwhile, the flatness of the ground base layer requires a tolerance of +/-2 mm within two meters.
When water accumulates on the ground in the construction process of the concrete slurry or water is added for dilution and matched construction during construction, water from different sources is easy to rapidly disperse through hydrophilic lignin and silicon dioxide of the flexible biological aggregate in the slurry to form a water dispersion path when contacting the prepared slurry, and the slurry obtained by the invention is stable and has good binding power, so that an anti-crack ground layer and a bottom layer where the anti-crack ground layer is positioned are prevented from being easily layered, and hollowing and cracking are avoided; after the construction is finished and cured, the slurry has small rigid aggregate consumption and low dry density, can still maintain good crack resistance even if materials such as an anti-cracking steel mesh and the like are not used, and avoids the dusting and the sanding caused by the sinking of the aggregate in the obtained ground structure.
Claims (10)
1. A preparation method of an anti-crack ground structure is characterized by comprising the following steps: when in pouring, the concrete slurry automatically levels in the plane space of the template under the action of self weight, and comprises the following substances:
the concrete mortar comprises portland cement, sulphoaluminate cement, sand, hydrophilic flaky flexible biological aggregate with a water guide network, a water reducing agent, an expanding agent and an alkaline substance for adjusting the concrete mortar to be alkaline;
the flexible biological aggregate in the concrete slurry is a composition of lignin and silicon dioxide, and the lignin and the silicon dioxide keep an in-situ connection structure in the rice hull;
in the pouring process, water from concrete slurry or water in an external environment is uniformly dispersed by taking lignin in the flaky flexible biological aggregate as a water guide network;
the lignin and the silicon dioxide are both connected with hydroxyl;
wherein the lignin and silica of the flexible biological aggregate are dispersed in the slurry to form a cementitious network during the setting of the concrete.
2. The method of claim 1, wherein: the concrete slurry comprises the following materials in parts by weight:
3. the method of claim 2, wherein: the alkaline substance is sodium hydroxide or potassium oxide.
4. The method of claim 1, wherein: the preparation method of the flexible biological aggregate comprises the following steps:
firstly, cleaning and drying rice hulls with sheet structures;
step two, placing the dried rice hulls in 1M hydrochloric acid or sulfuric acid to remove carbohydrates in the rice hulls, keeping the rice hulls to have a connection structure of lignin and silicon dioxide, cleaning to be neutral, and drying;
obtaining the flexible biological aggregate dissolved in the alkaline solution.
5. The method for preparing the same according to claim 1, wherein: the concrete slurry also comprises 2 to 5 parts by mass of electrolyte with a chain structure as a dispersant.
6. The method for preparing the same according to claim 1, wherein:
the dispersing agent is sodium alginate.
7. The method of claim 1, wherein:
the expanding agent comprises magnesium oxide and nano calcium carbonate;
the mass ratio of the two is (2-3): (1-2).
8. A floor structure obtained by the production method according to any one of claims 1 to 7.
9. The ground structure of claim 8, wherein:
the ground structure is one of ground surface layers in a factory building, a warehouse or an underground garage;
or a leveling layer for a floor coating top.
10. The ground structure of claim 9, wherein: the thickness of the surface layer or the leveling layer is less than 20mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211240620.3A CN115557761B (en) | 2022-10-11 | 2022-10-11 | Crack-resistant ground structure and preparation method thereof |
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| CN116040995A (en) * | 2023-01-06 | 2023-05-02 | 新旺基科技工程集团有限公司 | High-adhesion high-strength concrete for self-leveling terrace and preparation method |
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| CN116040995A (en) * | 2023-01-06 | 2023-05-02 | 新旺基科技工程集团有限公司 | High-adhesion high-strength concrete for self-leveling terrace and preparation method |
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