CN114804738A - Method for improving strength of foam concrete - Google Patents
Method for improving strength of foam concrete Download PDFInfo
- Publication number
- CN114804738A CN114804738A CN202210523631.6A CN202210523631A CN114804738A CN 114804738 A CN114804738 A CN 114804738A CN 202210523631 A CN202210523631 A CN 202210523631A CN 114804738 A CN114804738 A CN 114804738A
- Authority
- CN
- China
- Prior art keywords
- ceramsite
- foam concrete
- stirring
- slurry
- strength
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
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
-
- 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
- C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B16/04—Macromolecular compounds
- C04B16/06—Macromolecular compounds fibrous
- C04B16/0616—Macromolecular compounds fibrous from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B16/0625—Polyalkenes, e.g. polyethylene
- C04B16/0633—Polypropylene
-
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
- C04B18/023—Fired or melted 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
- C04B18/08—Flue dust, i.e. fly ash
-
- 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1055—Coating or impregnating with inorganic materials
- C04B20/1077—Cements, e.g. waterglass
-
- 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
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a method for improving the strength of foam concrete, which comprises the following steps: s1, weighing the materials; s2, screening ceramsite; s3, preparing slurry; s4, ceramsite sizing; s5, adding polypropylene fibers into the foamed concrete with the formed slurry in an equal amount in a divided manner, and stirring; s6, adding the treated ceramsite and stirring for 60S, and adding the foam concrete prepared in the step S7 into a stirrer and stirring for 3-5 min; and S7, forming indoors, filling the slurry, standing for 20 minutes, leveling, standing for 2 days, and removing the mold. The invention has the advantages that: the strength of the foam concrete is greatly improved under the condition of ensuring the existence of other advantages of the foam concrete.
Description
Technical Field
The invention relates to the technical field of foam concrete walls, in particular to a method for improving the strength of foam concrete.
Background
Foam concrete has been widely used as a new wall material as a lightweight concrete. The wall body made of the foam concrete not only has the advantages of light weight, good heat preservation and insulation performance, low manufacturing cost and the like. And the development of the foam concrete is beneficial to saving resources and protecting the environment, but compared with other concrete, the foam concrete has the defects of low strength, easy generation of cracks and the like, and the development of the foam concrete is greatly limited.
At present, the most common methods for improving the strength of the foam concrete comprise methods of adjusting the mixing proportion of the foam concrete, adding coarse aggregates such as ceramsite and the like, improving the maintenance condition and the like. These methods have the following disadvantages:
when the coarse aggregate such as the ceramsite is added, if the factors of selecting the particle size of the ceramsite, suspending the ceramsite on the upper layer of the foam concrete due to too low density and the like are not considered, the effect of improving the strength of the foam concrete by the coarse aggregate can be greatly reduced.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for improving the strength of foam concrete, which can greatly improve the strength of the foam concrete under the condition of ensuring the existence of other advantages of the foam concrete.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: a method for improving the strength of foam concrete is characterized by comprising the following steps:
s1, weighing the use amounts of cement, water, ultrafine powder, fly ash, an additive, ceramsite (coarse aggregate) and polypropylene fiber according to the proportion, wherein the ratio of the ultrafine powder to the fly ash is 1: 1.4-2.6;
s2, placing the ceramsite in a sieve with the aperture of 5mm for screening, placing the screened ceramsite with the particle size of more than 5mm in the sieve with the aperture of 15mm for screening, and finally obtaining the ceramsite with the particle size within the range of 5-15 mm;
s3, fully stirring and mixing the cement, the fine sand and the fly ash, adding water and the additive, and stirring for 3-5 minutes to form slurry;
s4, evenly dividing the screened ceramsite, grouping and sizing the ceramsite, soaking the ceramsite in clear water, adhering fine sand on the surface of the soaked ceramsite to enable the ceramsite to be more tightly adhered to cement paste, placing the ceramsite adhered with the fine sand in a special slurry coating device for coating the cement paste for 1min, and ensuring that the diameter expansion amount of the sized ceramsite is about 20% of the original particle size of the ceramsite;
s5, preparing the foam concrete by using a foaming machine, adding the polypropylene fiber with the fiber length of 6-12mm into the foam concrete with the formed slurry in a dividing and equal amount and stirring, wherein the fiber mixing amount is controlled at 0.6kg/m 3 ，
S6, adding the treated ceramsite and stirring for 60S, and adding the foam concrete prepared in the step S5 into a stirrer and stirring for 3-5 min;
and S7, forming indoors, filling the slurry, standing for 20 minutes, leveling, standing for 2 days, and removing the mold.
Further, the admixture comprises a water reducing agent, an early strength agent and a foam stabilizer, and the weight ratio of the water reducing agent to the early strength agent to the foam stabilizer is 1:10: 1.
Compared with the prior art, the invention has the advantages that:
1. the admixture of ultrafine powder, fly ash and the like is used for replacing cement, so that resources can be saved on the basis of improving the strength of the foam concrete, and the carbon emission is reduced;
2. in the traditional method, coarse aggregates such as ceramsite and the like are mixed, so that the strength of the foam concrete can be obviously improved, but the ceramsite is a material with extremely strong water absorption capacity, and can absorb water in the foam concrete if being added and stirred without any treatment, so that the strength of the concrete is influenced, the ceramsite with the particle size of 5-15mm is firstly screened, the problems can be effectively avoided by wrapping cement slurry with certain strength and high hardening speed on the basis of ensuring the quality of ceramsite raw materials, and the strength of the foam concrete is greatly improved;
3. the ceramsite is wrapped by the slurry in three steps, the ceramsite is soaked firstly, fine sand is adhered, and then the ceramsite is subjected to slurry coating, so that the three-step slurry coating method can effectively improve the cohesiveness between the ceramsite and cement slurry and the gravity of the ceramsite, and prevent the phenomena of desizing and floating during the stirring process of the ceramsite and foam concrete;
4. the admixture composed of the water reducing agent, the early strength agent and the foam stabilizer is added, so that the strength of the foam concrete is improved under the condition of reducing the cost to the maximum extent;
5. the polypropylene fiber with the diameter of 6-12mm is added into the foam concrete with the formed slurry in equal amount by times and is stirred, the crack resistance and the compression resistance of the foam concrete can be obviously improved, and the cost of using the polypropylene fiber is relatively low.
Drawings
FIG. 1 is a flow chart of a method of improving the strength of foamed concrete according to the present invention.
Detailed Description
Examples
A method for improving the strength of foam concrete comprises the following steps:
s1, weighing the use amounts of cement, water, ultrafine powder, fly ash, an additive, ceramsite (coarse aggregate) and polypropylene fiber according to the proportion, wherein the ratio of the ultrafine powder to the fly ash is 1: 1.4-2.6;
s2, placing the ceramsite in a sieve with the aperture of 5mm for screening, placing the screened ceramsite with the particle size of more than 5mm in the sieve with the aperture of 15mm for screening, and finally obtaining the ceramsite with the particle size within the range of 5-15 mm;
s3, fully stirring and mixing the cement, the fine sand and the fly ash, adding water and the additive, and stirring for 3-5 minutes to form slurry;
s4, evenly dividing the screened ceramsite, grouping and sizing the ceramsite, soaking the ceramsite in clear water, adhering fine sand on the surface of the soaked ceramsite to enable the ceramsite to be more tightly adhered to cement paste, placing the ceramsite adhered with the fine sand in a special slurry coating device for coating the cement paste for 1min, and ensuring that the diameter expansion amount of the sized ceramsite is about 20% of the original particle size of the ceramsite;
s5, preparing the foam concrete by using a foaming machine, adding the polypropylene fiber with the fiber length of 6-12mm into the foam concrete with the formed slurry in a dividing and equal amount and stirring, wherein the fiber mixing amount is controlled at 0.6kg/m 3 ，
S6, adding the treated ceramsite and stirring for 60S, and adding the foam concrete prepared in the step S5 into a stirrer and stirring for 3-5 min;
and S7, forming indoors, filling the slurry, standing for 20 minutes, leveling, standing for 2 days, and removing the mold.
The compressive strength test of the prepared foam concrete is carried out according to JC/T1062-2007 foam concrete block and GB/T11969-2008 autoclaved aerated concrete performance test method, and the specific test steps are as follows:
(1) taking out the test piece from a standard curing room, wiping the surface, checking the appearance, measuring the size of the test piece (the measurement is accurate to 1mm), selecting a cubic test block of 100mm x 100mm x 100mm for the size of the foamed concrete test piece, calculating the pressure bearing area of the test piece, and calculating according to the nominal size, wherein the difference between the actually measured size and the nominal size is less than 1 mm;
(2) placing a test piece at a pressure plate position under a pressure testing machine to ensure that a pressure bearing surface is vertical to a formed top surface, aligning the center of the test piece to the center of a lower pressure plate of the testing machine, starting the testing machine, and adjusting a ball seat when an upper pressure plate is close to the test piece to ensure that the upper and lower pressure plates can be in uniform contact with the upper and lower surfaces of the test piece;
(3) and (3) continuously and uniformly loading during pressurization detection, wherein the loading speed is 0.15-0.25 MPa/s, when the test piece is close to damage and cracks appear and begins to deform rapidly, the accelerator of the testing machine is stopped until the test piece is completely damaged, and the damage load F (N) is recorded.
(4) Test results the cubic compressive strength of the foam concrete was calculated according to the following formula:
in the formula (I), the compound is shown in the specification,
f-the compressive strength of the test piece, in megapascals (MPa), to the accuracy of 0.01MPa,
f-maximum failure load;
a is the pressed area of the test piece.
The compressive strength arithmetic average value measured by 3 test pieces is taken as the compressive strength value of the group of test pieces, and the average value is calculated to be accurate to 0.1 MPa.
And when the difference between one of the maximum value or the minimum value of the 3 test pieces and the average value is larger than 15 percent, the maximum value and the minimum value are together discarded during calculation, and the middle value is taken as the compressive strength value of the group of test pieces. If the difference between the maximum and minimum values and the median value exceeds 15% of the median value, the set of test results is invalidated. The experimental data were obtained as follows:
analysis of the above test data revealed that as the amount of the superfine powder substituted increases, the density of the foamed concrete decreases and the compressive strength of the foamed concrete also decreases. Aiming at the influence factor of the water-cement ratio, the reduction of the water-cement ratio improves the compressive strength and the density of the foam concrete to a certain extent.
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.
Claims (2)
1. A method for improving the strength of foam concrete is characterized by comprising the following steps:
s1, weighing the use amounts of cement, water, ultrafine powder, fly ash, an additive, ceramsite (coarse aggregate) and polypropylene fiber according to the proportion, wherein the ratio of the ultrafine powder to the fly ash is 1: 1.4-2.6;
s2, placing the ceramsite in a sieve with the aperture of 5mm for screening, placing the screened ceramsite with the particle size of more than 5mm in the sieve with the aperture of 15mm for screening, and finally obtaining the ceramsite with the particle size within the range of 5-15 mm;
s3, fully stirring and mixing the cement, the fine sand and the fly ash, adding water and the additive, and stirring for 3-5 minutes to form slurry;
s4, evenly dividing the screened ceramsite, grouping and sizing the ceramsite, soaking the ceramsite in clear water, adhering fine sand on the surface of the soaked ceramsite to enable the ceramsite to be more tightly adhered to cement paste, placing the ceramsite adhered with the fine sand in a special slurry coating device for coating the cement paste for 1min, and ensuring that the diameter expansion amount of the sized ceramsite is about 20% of the original particle size of the ceramsite;
s5, preparing the foam concrete by using a foaming machine, adding the polypropylene fiber with the fiber length of 6-12mm into the foam concrete with the formed slurry in a dividing and equal amount and stirring, wherein the fiber mixing amount is controlled at 0.6kg/m 3 ，
S6, adding the treated ceramsite and stirring for 60S, and adding the foam concrete prepared in the step S5 into a stirrer and stirring for 3-5 min;
and S7, forming indoors, filling the slurry, standing for 20 minutes, leveling, standing for 2 days, and removing the mold.
2. The method of claim 1, wherein the method comprises the steps of: the admixture comprises a water reducing agent, an early strength agent and a foam stabilizer, and the weight ratio of the water reducing agent to the early strength agent to the foam stabilizer is 1:10: 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210523631.6A CN114804738A (en) | 2022-05-13 | 2022-05-13 | Method for improving strength of foam concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210523631.6A CN114804738A (en) | 2022-05-13 | 2022-05-13 | Method for improving strength of foam concrete |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114804738A true CN114804738A (en) | 2022-07-29 |
Family
ID=82514503
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210523631.6A Pending CN114804738A (en) | 2022-05-13 | 2022-05-13 | Method for improving strength of foam concrete |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114804738A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2028170A1 (en) * | 2007-08-23 | 2009-02-25 | "TECHNOPOR" Handels GmbH | Method for making light-weight concrete |
| CN107235681A (en) * | 2017-06-14 | 2017-10-10 | 宁波普利凯建筑科技有限公司 | Self heat insulation wall haydite concrete and preparation method thereof |
-
2022
- 2022-05-13 CN CN202210523631.6A patent/CN114804738A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2028170A1 (en) * | 2007-08-23 | 2009-02-25 | "TECHNOPOR" Handels GmbH | Method for making light-weight concrete |
| CN107235681A (en) * | 2017-06-14 | 2017-10-10 | 宁波普利凯建筑科技有限公司 | Self heat insulation wall haydite concrete and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112500062A (en) | Self-compacting concrete prepared from recycled aggregate and preparation method thereof | |
| CN112830729B (en) | High-strength concrete and preparation method thereof | |
| Nematzadeh et al. | Compressing fresh concrete technique and the effect of excess water content on physical–mechanical properties of compressed concrete | |
| CN115321885B (en) | Polymer modified cement-based repair mortar for marine concrete and preparation method thereof | |
| CN112876153B (en) | Recycled concrete and preparation method thereof | |
| CN112897942A (en) | C35 concrete and preparation method thereof | |
| CN111072344B (en) | High-crack-resistance low-shrinkage premixed concrete | |
| CN114804738A (en) | Method for improving strength of foam concrete | |
| CN114105540B (en) | Recycled concrete and preparation method thereof | |
| CN115974477A (en) | Ultra-high performance concrete containing rare earth polishing powder waste and preparation method thereof | |
| CN112341121B (en) | Light high-strength concrete for civil engineering | |
| CN113292295B (en) | Freeze-thaw resistant pervious concrete and preparation method thereof | |
| CN115124298A (en) | High-strength recycled aggregate concrete prepared from waste stone powder and preparation method thereof | |
| CN112897953A (en) | Recycled concrete with impermeability and preparation method thereof | |
| Long et al. | A study on the strength surplus coefficient of cement | |
| CN115872653B (en) | Modified EPS particles, preparation method thereof and lightweight aggregate concrete containing modified EPS particles | |
| CN112194418B (en) | Wood fiber self-compacting concrete | |
| CN112142408B (en) | Lightweight medium-high pressure die and preparation method thereof | |
| CN111454077A (en) | Method for accurately controlling concrete porosity and application thereof | |
| CN114861359A (en) | Steel slag porous concrete mixing proportion determining method based on response surface method | |
| Hernando | Planning Of Highquality Concrete Mixtures With Additional Superplasticizer And The Effect Of Partial Cement Replacement With Fly Ash | |
| CN117735928A (en) | Forming process for targeted improvement of interface transition zone of high-doped fly ash concrete | |
| CN114477866A (en) | Processing method of pre-wetted porous basalt aggregate concrete | |
| Zhao et al. | Application of SAP in recycling samples of waste asphalt | |
| CN117534405A (en) | Interface treating agent and preparation method and application thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20220729 |
|
| RJ01 | Rejection of invention patent application after publication |