CN111302751A - Wall material composite material - Google Patents
Wall material composite material Download PDFInfo
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- CN111302751A CN111302751A CN202010123134.8A CN202010123134A CN111302751A CN 111302751 A CN111302751 A CN 111302751A CN 202010123134 A CN202010123134 A CN 202010123134A CN 111302751 A CN111302751 A CN 111302751A
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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
- C04B28/16—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing anhydrite, e.g. Keene's cement
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/52—Sound-insulating materials
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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
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
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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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides a wall material composite material, and belongs to the technical field of building materials. The wall material composite material provided by the invention comprises the following components in percentage by mass: 0.1 to 6 percent of ordinary Portland cement, 0.1 to 12 percent of sulphoaluminate cement, 40 to 70 percent of semi-hydrated gypsum, 5 to 15 percent of anhydrous gypsum, 15 to 30 percent of filling aggregate, 1 to 3 percent of water reducing agent, 0.2 to 1.2 percent of reinforcing agent, 0.1 to 0.8 percent of water repellent and 0.1 to 0.3 percent of thickening agent. The wall material composite material prepared by the invention has the characteristics of controllable setting and hardening time, excellent mechanical property, high early strength and continuous increase of later strength.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a wall material composite material.
Background
The wall material as a green building material has a series of advantages of light weight, sound insulation, heat preservation and the like, but the wall material has large floor area of a production plant and high production cost; the raw materials used by the product are complex in components, and the product quality fluctuation is large; the product has long coagulation time and low early strength, and seriously influences the production efficiency, and the factors limit the large-area popularization of wall materials.
CN107129205B discloses a wall material and a preparation method thereof, wherein the wall material is mainly prepared from cement, polyethylene glycol phase change heat storage particles, porous silicon oxide, a foaming agent, fly ash, a shrinkage reducing agent and a modifier according to the mass ratio of (20-30): 10-20): 5-15): 3-8): 30-40): 1-5): 3-8. In the preparation process, the gelled material slurry and the foam are prepared, then the foam and the gelled material slurry are mixed to prepare the foam slurry, and then the foam slurry is poured and molded to obtain the wall material. The wall material is prepared by foaming inorganic materials serving as main components, and the prepared wall material can effectively reduce the heat conductivity coefficient and the dry density, but the building blocks need to be poured and formed, so that the requirements of high speed, hardness and strength cannot be met.
Disclosure of Invention
In view of the above, the present invention provides a composite material for wall materials. The wall material composite material provided by the invention has the characteristics of high condensation speed, high hardness and high strength.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a wall material composite material which comprises the following components in percentage by mass:
0.1 to 6 percent of ordinary Portland cement, 0.1 to 12 percent of sulphoaluminate cement, 40 to 70 percent of semi-hydrated gypsum, 5 to 15 percent of anhydrous gypsum, 15 to 30 percent of filling aggregate, 1 to 3 percent of water reducing agent, 0.2 to 1.2 percent of reinforcing agent, 0.1 to 0.8 percent of water repellent and 0.1 to 0.3 percent of thickening agent.
Preferably, the wall material composite material comprises the following components in percentage by mass:
2 to 5 percent of ordinary portland cement, 5 to 10 percent of sulphoaluminate cement, 47.2 to 65 percent of semi-hydrated gypsum, 7 to 8 percent of anhydrous gypsum, 20 to 25 percent of filling aggregate, 1.3 to 1.8 percent of water reducing agent, 0.7 to 1 percent of reinforcing agent, 0.4 to 0.5 percent of water repellent and 0.2 percent of thickening agent.
Preferably, the wall material composite material comprises the following components in percentage by mass:
4 percent of ordinary portland cement, 7 percent of sulphoaluminate cement, 57 percent of semi-hydrated gypsum, 7 to 8 percent of anhydrous gypsum, 22 percent of filling aggregate, 1.3 to 1.8 percent of water reducing agent, 0.7 to 1 percent of reinforcing agent, 0.4 to 0.5 percent of water repellent and 0.2 percent of thickening agent.
Preferably, the hemihydrate gypsum is β type hemihydrate gypsum or α type hemihydrate gypsum.
Preferably, the filler aggregate comprises one or more of fly ash, slag, silico-manganese slag, ferronickel slag or powdered mine tailings.
Preferably, the specific surface area of the filling aggregate is more than or equal to 260m2/g。
Preferably, the water reducing agent is a polycarboxylic acid water reducing agent or a naphthalene water reducing agent.
Preferably, the enhancer comprises triethanolamine, calcium formate, sodium borate or lithium carbonate.
Preferably, the water repellent is SHP-50 polysiloxane or calcium stearate.
Preferably, the thickener comprises methylhydroxypropylcellulose, hydroxypropyl guar or xanthan gum.
The wall material composite material provided by the invention comprises the following components in percentage by mass: 0.1 to 6 percent of ordinary Portland cement, 0.1 to 12 percent of sulphoaluminate cement, 40 to 70 percent of semi-hydrated gypsum, 5 to 15 percent of anhydrous gypsum, 15 to 30 percent of filling aggregate, 1 to 3 percent of water reducing agent, 0.2 to 1.2 percent of reinforcing agent, 0.1 to 0.8 percent of water repellent and 0.1 to 0.3 percent of thickening agent. The invention takes the semi-hydrated gypsum as the main cementing material, which provides the strength of the wall material composite material; after the semi-hydrated gypsum is hydrated, higher porosity of 40-70 percent can be generated, which is beneficial to reducing the volume weight of the composite material of the wall material and improving the heat insulation performance and the sound insulation performance; the semi-hydrated gypsum is prepared by calcining industrial waste residue desulfurized gypsum, and the invention takes the semi-hydrated gypsum as a raw material, can improve the utilization rate of the industrial waste residue desulfurized gypsum and achieves the purposes of environmental protection and energy saving. In the invention, the sulphoaluminate cement is used as an early strength component, has the characteristics of high coagulation speed and high early strength, and can generate SO in the hydration process4 2+、Ca2+、OH-、AlO2-Plasma, the ions form a supersaturated liquid phase interlayer around the cement hydrated particles, and react with other ions generated in the hydration process of gypsum and calcium hydroxide to form ettringite, so that the strength of the wall material composite material is improved; simultaneously, the sulphoaluminate cement can promote the hydration of the semi-hydrated gypsumAnd (6) carrying out the process. In the invention, the anhydrous gypsum can adjust the setting time and accelerate the setting speed of the wall material composite material. In the invention, the reinforcing agent can promote the early hydration process of the ordinary Portland cement, accelerate the process of generating calcium sulphoaluminate by the reaction of the ordinary Portland cement and gypsum and improve the early mechanical property of the wall material composite material. In the invention, the hydration process of the ordinary Portland cement can generate calcium hydroxide, so that the activity of the semi-hydrated gypsum, the anhydrous gypsum and the filling aggregate is excited, and the later strength of the wall material composite material is improved. The wall material composite material prepared by the method has controllable setting and hardening time, the preparation efficiency of the wall material composite material is obviously improved, and the operation efficiency of a factory is improved; the mechanical property is excellent, the early strength is high, the later strength is continuously increased, and the plastic mortar has the characteristics of good plasticity, uniform slurry and easy molding. The embodiment result shows that the composite material for the wall material prepared by the invention has excellent impact resistance, after 8 times of impact resistance tests, the surface of a wall body has no crack, the bending resistance and the bearing performance are good, the composite material can bear the pressure with the self weight multiple of 1.7-1.8 times, the early strength is high, the later strength is continuously increased, the 3d compressive strength is 12.5-15.7 MPa, the 7d compressive strength is 15.7-18.2 MPa, the 28d compressive strength is 28.4-33.9 MPa, the drying shrinkage value is small and is 0.2, the setting speed is high, the initial setting time is 5-7 h, the final setting time is 12-15 h, the heat conductivity is good, the heat conductivity is 0.027-0.029W/(m 2. K), and the sound insulation performance is excellent.
The semi-hydrated gypsum, the anhydrous gypsum and the filling aggregate in the raw materials are more than 80 percent by mass, and the components are industrial waste residues, so that the resource utilization degree of the waste residues can be effectively improved; the production factory can be directly used without additional ingredients, and the production flow of the factory is simplified; the raw materials are easy to obtain, the production process is simple, large-scale industrialization is easy to realize, the product quality is stable, the production cost is low, the production process is green and environment-friendly, and no wastewater or waste residue is discharged.
Detailed Description
The invention provides a wall material composite material which comprises the following components in percentage by mass:
0.1 to 6 percent of ordinary Portland cement, 0.1 to 12 percent of sulphoaluminate cement, 40 to 70 percent of semi-hydrated gypsum, 5 to 15 percent of anhydrous gypsum, 15 to 30 percent of filling aggregate, 1 to 3 percent of water reducing agent, 0.2 to 1.2 percent of reinforcing agent, 0.1 to 0.8 percent of water repellent and 0.1 to 0.3 percent of thickening agent.
In the present invention, the raw materials used are all commercial products conventional in the art unless otherwise specified.
The invention provides a wall material composite material, which comprises 0.1-6% of ordinary portland cement by mass, preferably 2-5% of ordinary portland cement by mass, and more preferably 4% of ordinary portland cement by mass. The particle size of the ordinary portland cement is not particularly limited in the invention, and the conventional particle size range in the field can be adopted. In the invention, the hydration process of the ordinary Portland cement can generate calcium hydroxide, so that the activity of the semi-hydrated gypsum, the anhydrous gypsum and the filling aggregate is excited, and the later strength of the wall material is improved.
Based on the mass percentage of the ordinary portland cement, the wall material composite comprises 0.1-12% of sulphoaluminate cement by mass percentage, preferably 5-10% of sulphoaluminate cement by mass percentage, and more preferably 7% of sulphoaluminate cement by mass percentage. The particle size of the ordinary portland cement is not particularly limited in the invention, and the conventional particle size range in the field can be adopted. In the invention, the sulphoaluminate cement is used as an early strength component, has the characteristics of high coagulation speed and high early strength, and can generate SO in the hydration process4 2+、Ca2+、OH-、AlO2-Plasma, the ions form a supersaturated liquid phase interlayer around the particles, and react with other ions generated in the hydration process of gypsum and calcium hydroxide to form ettringite, so that the strength of the wall material is improved; and simultaneously, the sulphoaluminate cement can promote the hydration process of the hemihydrate gypsum.
The wall material composite material comprises, by mass, 40-70% of semi-hydrated gypsum, preferably 47.2-65% of ordinary portland cement, and more preferably 57%, wherein the semi-hydrated gypsum has a particle size of preferably less than 10% of a sieve residue of a 0.2mm square-hole sieve.
Based on the mass percentage of the ordinary portland cement, the wall material composite material comprises 5-15% of anhydrous gypsum by mass percentage, and is further preferably 7-8%. In the invention, the particle size of the hemihydrate gypsum is preferably 0.2mm square-hole sieve residue < 10%.
Based on the mass percentage of the ordinary portland cement, the wall material composite comprises 15-30% by mass of filling aggregate, preferably 20-25% by mass, and more preferably 22% by mass. In the present invention, the filler aggregate preferably comprises one or more of fly ash, slag, silicomanganese slag, ferronickel slag or powdery mine tailings; when the filled aggregate preferably includes a plurality of components, the mass ratio of the plurality of components is not particularly limited in the present invention, and any mass ratio may be used. In the present invention, the specific surface area of the filled aggregate is preferably 260m or more2(ii) g, more preferably 300m2/g～320m2(ii) in terms of/g. The invention adopts the specific surface area of the filling aggregate to ensure the particle size distribution of the filling aggregate, if the specific surface area is too small, the particles are too coarse, the particle size distribution is concentrated, and the potential gelation property of the filling aggregate is not easy to be exerted.
Based on the mass percentage of the ordinary portland cement, the wall material composite material comprises 1-3% of a water reducing agent by mass percentage, and preferably 1.3-1.8%. In the present invention, the water reducing agent is preferably a polycarboxylic acid water reducing agent or a naphthalene water reducing agent. In the invention, the water reducing agent can be adsorbed on the surface of the cement particles in a directional manner, and after the water reducing agent is added, the surface of the cement particles has the same charge (usually negative charge) to form an electrostatic repulsion effect, so that the mutual dispersion of the cement particles is promoted, the flocculation structure is destroyed, and the wrapped part of water is released, thereby effectively increasing the fluidity of the cement paste.
Based on the mass percentage of the ordinary portland cement, the wall material composite comprises 0.2-1.2% of a reinforcing agent by mass percentage, and preferably 0.7-1%. In the present invention, the enhancer preferably includes triethanolamine, calcium formate, sodium borate, or lithium carbonate. In the invention, the reinforcing agent can promote the early hydration process of the ordinary Portland cement, accelerate the process of generating calcium sulphoaluminate by the reaction of the ordinary Portland cement and gypsum and improve the early mechanical property of the wall material.
Based on the mass percentage of the ordinary portland cement, the wall material composite material comprises 0.1-0.8% of water repellent, and preferably 0.4-0.5%. In the invention, the water repellent is preferably SHP-50 polysiloxane or calcium stearate. In the invention, the water repellent can endow the material with excellent water repellency, prevent liquid water from permeating into the cured gypsum-based material through the surface or capillary action, greatly reduce the water absorption of the material and simultaneously not influence the mechanical property of the material.
Based on the mass percentage of the ordinary portland cement, the wall material composite comprises 0.1-0.3% of a thickening agent by mass percentage, and preferably 0.2% by mass percentage. In the present invention, the thickener preferably comprises methylhydroxypropylcellulose, hydroxypropyl guar or xanthan gum. In the invention, the hydrophobic main chain of the thickener molecule is associated with the surrounding water molecules through hydrogen bonds, thereby improving the fluid volume of the polymer and reducing the free movement space of particles, thereby improving the viscosity of the system and keeping the system uniform and stable.
The invention also provides a preparation method of the wall material composite material in the technical scheme, which comprises the following steps:
mixing ordinary portland cement, sulphoaluminate cement, semi-hydrated gypsum, anhydrous gypsum, filling aggregate, a water reducing agent, a reinforcing agent, a water repellent and a thickening agent to obtain the wall material composite material.
In the present invention, the mixing order is preferably that portland cement, sulphoaluminate cement, hemihydrate gypsum, anhydrous gypsum and filler aggregate are mixed, and then mixed with a water reducing agent, a reinforcing agent, a water repellent and a thickening agent. In the present invention, the mixing is preferably performed by stirring. The invention has no special limitation on the specific operation condition of stirring, and the raw materials can be uniformly mixed.
In the present invention, the method for applying the wall material composite material preferably comprises the following steps:
and mixing the wall material composite material with water to obtain the wall material.
In the invention, the mixing is preferably carried out in a stirrer, and the stirring speed is preferably 10-20 r/min; the stirring time is preferably 1-3 min. In the present invention, the mixing order is preferably to add water while stirring the wall material composite. In the invention, the mass ratio of the wall material composite material to water is preferably 0.3-0.4: 1.
in the invention, the wall material composite material is preferably prepared in situ when in use.
The application mode of the wall material is not particularly limited, and the application mode known to those skilled in the art can be adopted.
The wall material composite material provided by the present invention will be described in detail with reference to the following examples, but they should not be construed as limiting the scope of the present invention.
Example 1
A wall material composite material comprises the following components in percentage by weight:
2 percent of ordinary Portland cement, 5 percent of sulphoaluminate cement,65% of β type semi-hydrated gypsum, 5% of anhydrous gypsum and 20% of filling aggregate (the mass ratio of the slag to the fly ash is 2:1, and the specific surface areas of the slag and the fly ash are both 300m2Per gram), 1.3% of polycarboxylic acid water reducing agent, 1% of triethanolamine, 0.5% of SHP-50 polysiloxane and 0.2% of xanthan gum.
And mixing the components to obtain the wall material composite material.
Example 2
A wall material composite material comprises the following components in percentage by weight:
4 percent of ordinary portland cement, 7 percent of sulphoaluminate cement, 57 percent of β type semi-hydrated gypsum, 7 percent of anhydrous gypsum and 22 percent of filling aggregate (the mass ratio of the silicomanganese slag to the nickel-iron slag is 1:1, and the specific surface areas of the silicomanganese slag and the nickel-iron slag are both 320m2Per gram), 1.8% of polycarboxylic acid water reducing agent, 0.7% of calcium formate, 0.4% of SHP-50 polysiloxane and 0.1% of methyl hydroxypropyl cellulose.
And mixing the components to obtain the wall material composite material.
Example 3
A wall material composite material comprises the following components in percentage by weight:
5 percent of ordinary portland cement, 10 percent of sulphoaluminate cement, 47.2 percent of β type hemihydrate gypsum, 8 percent of anhydrous gypsum and 25 percent of filling aggregate (the mass ratio of the powdery mine tailings to the fly ash is 1:2, and the specific surface areas of the powdery mine tailings and the fly ash are both 320m2/g), 3% naphthalene based water reducer, 1% lithium carbonate, 0.5% calcium stearate and 0.3% methylhydroxypropylcellulose.
And mixing the components to obtain the wall material composite material.
Application examples
The wall material composite material prepared in the embodiment 1-3 is subjected to an application performance test. The test is carried out according to GB50574-2010 unified technical specification for wall material application and GB/T23451-2009 light partition wall batten for buildings, and the test results are shown in Table 1.
Table 1 results of performance test of wall material composites prepared in examples 1 to 3
The experimental results show that the wall material composite material prepared by the invention has excellent mechanical properties, high condensation speed, high hardness, good impact resistance, high strength, large bending resistance bearing capacity, high early and later compressive strength, and good volume weight, thermal insulation performance and sound insulation performance.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The wall material composite material is characterized by comprising the following components in percentage by mass:
0.1 to 6 percent of ordinary Portland cement, 0.1 to 12 percent of sulphoaluminate cement, 40 to 70 percent of semi-hydrated gypsum, 5 to 15 percent of anhydrous gypsum, 15 to 30 percent of filling aggregate, 1 to 3 percent of water reducing agent, 0.2 to 1.2 percent of reinforcing agent, 0.1 to 0.8 percent of water repellent and 0.1 to 0.3 percent of thickening agent.
2. The wall material composite material as claimed in claim 1, which comprises the following components in percentage by mass:
2 to 5 percent of ordinary portland cement, 5 to 10 percent of sulphoaluminate cement, 47.2 to 65 percent of semi-hydrated gypsum, 7 to 8 percent of anhydrous gypsum, 20 to 25 percent of filling aggregate, 1.3 to 1.8 percent of water reducing agent, 0.7 to 1 percent of reinforcing agent, 0.4 to 0.5 percent of water repellent and 0.2 percent of thickening agent.
3. The wall material composite material as claimed in claim 1, which comprises the following components in percentage by mass:
4 percent of ordinary portland cement, 7 percent of sulphoaluminate cement, 57 percent of semi-hydrated gypsum, 7 to 8 percent of anhydrous gypsum, 22 percent of filling aggregate, 1.3 to 1.8 percent of water reducing agent, 0.7 to 1 percent of reinforcing agent, 0.4 to 0.5 percent of water repellent and 0.2 percent of thickening agent.
4. The wall material composite material as claimed in any one of claims 1 to 3, wherein the hemihydrate gypsum is β type hemihydrate gypsum or α type hemihydrate gypsum.
5. The wall material composite material according to any one of claims 1 to 3, wherein the filler aggregate comprises one or more of fly ash, slag, silicomanganese slag, ferronickel slag or powdered mine tailings.
6. The wall material composite material as claimed in claim 1, wherein the specific surface area of the filler aggregate is 260m or more2/g。
7. The wall material composite material according to claim 1, wherein the water reducing agent is a polycarboxylic acid water reducing agent or a naphthalene water reducing agent.
8. The wall material composite according to claim 1, wherein the reinforcing agent comprises triethanolamine, calcium formate, sodium borate, or lithium carbonate.
9. The wall material composite material as claimed in claim 1, wherein the water repellent is SHP-50 polysiloxane or calcium stearate.
10. The wall material composite according to claim 1, wherein the thickener comprises methylhydroxypropylcellulose, hydroxypropyl guar or xanthan gum.
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| CN202010123134.8A CN111302751A (en) | 2020-02-27 | 2020-02-27 | Wall material composite material |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113881267A (en) * | 2021-10-26 | 2022-01-04 | 瑞易德新材料股份有限公司 | Chlorinated rubber anticorrosive paint and preparation method thereof |
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