CN112374828A - Water-absorbing expansion ball combined method mould net cast-in-place foam concrete slurry - Google Patents
Water-absorbing expansion ball combined method mould net cast-in-place foam concrete slurry Download PDFInfo
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- CN112374828A CN112374828A CN202011289019.4A CN202011289019A CN112374828A CN 112374828 A CN112374828 A CN 112374828A CN 202011289019 A CN202011289019 A CN 202011289019A CN 112374828 A CN112374828 A CN 112374828A
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- water
- absorbing expansion
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- expansion ball
- concrete slurry
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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
- C04B28/02—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
- C04B28/04—Portland cements
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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
- C04B2111/40—Porous or lightweight materials
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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 water-absorbing expansion ball combined method mould net cast-in-place foam concrete slurry, which comprises the following components: cement, corncob particles, an anti-shrinkage agent, a thickening agent, a tackifier, a quick-setting agent, a core material, water-absorbing expansion balls, water and foam. In the scheme, the water-absorbing expansion balls are matched with a certain amount of corncob particles to replace expensive polyphenyl particles. In order to achieve a satisfactory slurry leakage prevention effect, a combination method is adopted, and the building cost is reasonably reduced on the basis of ensuring the performance of the anti-shrinkage agent, the thickening agent, the quick-setting agent, the core material and the foam under the synergistic action.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a water-absorbing expansion ball combined method mould net cast-in-place foam concrete slurry.
Background
The light concrete cast-in-situ wall with the mould net structure is widely popular in China in recent years, and has the advantages that the steel net is used for replacing a template, the process is simple, the slurry is firmly combined with the steel net, and the crack resistance and the impact resistance of the wall surface are high.
However, after the steel formwork cast-in-place wall body is poured with the foam concrete slurry, the foam concrete slurry can be leaked from the meshes under the dual actions of pressure formed by the self weight of the slurry and pumping pressure. To solve this problem, the measures taken in the prior art are: during pouring, polystyrene particle foam concrete slurry is used, and polystyrene particles are added into the foam concrete to prevent the foam concrete from leaking; meanwhile, the polyphenyl granules also play roles in reducing density, improving heat preservation and resisting shrinkage and cracking. But the price and the transportation cost of the polyphenyl granules are higher, the construction cost of the building is greatly improved, and the polyphenyl granules are not easy to purchase in villages and remote areas; the polyphenyl granules have the same great risk of fire during transportation and use. Therefore, it is necessary to develop a cast-in-place lightweight concrete slurry for a mould net, which does not need to add polyphenyl granules, can prevent slurry leakage during the cast-in-place of the mould net, can reduce the density and is anti-shrinkage and anti-cracking.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a water-absorbing expansion ball combined method for casting foam concrete slurry in situ on a mould net.
The invention is realized by the following technical scheme:
a water-absorbing expansion ball combined method mould net cast-in-place foam concrete slurry comprises the following components:
cement, corncob particles, an anti-shrinkage agent, a thickening agent, a tackifier, a quick-setting agent, a core material, a water-absorbing expansion ball, and also added water and foam.
In the scheme, the water-absorbing expansion balls are matched with a certain amount of corncob particles to replace expensive polyphenyl particles, so that the cost of the building is effectively reduced on the basis of ensuring the original performance of the building. The volume of the water absorption expansion ball can be increased by more than 100 times after water absorption, 5-8mm expansion balls with enough volume can be formed in concrete, and only hundreds of water absorption expansion balls are needed for one cubic meter of foam concrete. The diameter of the expansion balls is enough to block the meshes of the steel mesh and prevent the slurry from leaking outside. After the foam concrete is hardened, the water-absorbing expansion ball gradually loses water, the volume is reduced to form holes, which are equivalent to foam holes, and the effect of partial foam is also achieved. The scheme also adopts the matching effect of the corncob particles and the water absorption expansion balls, reduces the adding amount of the water absorption expansion balls, and controls the drying shrinkage. The corncob particles can also replace polyphenyl particles to play the roles of reducing the density and resisting the shrinkage and cracking.
In order to achieve a satisfactory slurry leakage prevention effect, the scheme also adopts a combination method comprehensive measure, and enhances the leakage prevention effect by the synergistic effect of other materials.
The combination method comprises the steps of combining a thickening agent to reduce the flowability of the slurry, using a thickening agent to improve the viscosity of the slurry, using a quick setting agent to accelerate the setting and thickening speed of the slurry, and using a core material to endow the slurry with self-standing property immediately after the slurry exits from a pump. And in order to counteract the drying shrinkage of the water-absorbing expansion ball after the slurry is hardened, an anti-shrinkage agent is added to reduce the negative effect of the water-absorbing expansion ball. And the density of the slurry is reduced by high-quality foam, the defect of high density of the expansion ball is overcome, and the light property of the slurry is ensured. The satisfactory effect can be achieved through the combined action of all materials.
The water-absorbing expansion ball can not be excessive because the water-absorbing expansion ball can also cause the drying shrinkage of a solidified body after dehydration; meanwhile, the corncob particles contain a large amount of lignin, which can cause retardation adverse effect on cement, so that the corncob particles cannot be added in a large amount and need to be cooperated with a proper amount of water-absorbing expansion balls.
Therefore, the corn cob particles account for 3 to 5 percent by mass, and the water-absorbing expansion balls in a dry state account for 0.01 to 0.02 percent by mass.
Further, the mass percentage of each component is as follows: 90 to 95 percent of cement, 3 to 5 percent of corncob particles, 0.5 to 1 percent of anti-shrinking agent, 0.1 to 0.3 percent of thickening agent, 0.02 to 0.1 percent of tackifier, 1 to 2 percent of quick-setting agent, 0.5 to 1 percent of core material and 0.01 to 0.02 percent of water-absorbing expansion ball in dry state;
the water-material ratio of the concrete slurry is 0.5-0.6, and the volume of the foam is proper.
Preferably, the mass percentage of each component is as follows: 90% of cement, 5% of corncob particles, 0.8% of anti-shrinkage agent, 0.2% of thickening agent, 0.03% of tackifier, 2% of quick-setting agent, 0.6% of core material and 0.01% of water-absorbing expansion ball in a dry state;
the water-material ratio of the concrete slurry is 0.6, and the foam consumption is 70% of the slurry volume.
Preferably, the mass percentage of each component is as follows: 95% of cement, 3% of corncob particles, 1.0% of anti-shrinkage agent, 0.15% of thickening agent, 0.02% of tackifier, 1.5% of quick-setting agent, 0.8% of core material and 0.02% of water-absorbing expansion ball in a dry state;
the water-material ratio of the concrete slurry is 0.56, and the foam consumption is 80% of the volume of the slurry.
The further technical scheme is as follows:
preferably, the cement is 42.5R ordinary portland cement which is early strength cement, so that the setting is accelerated, the slurry body is thickened as soon as possible, and the slurry leakage is reduced.
Preferably, the corncob particles adopt: the corn cob particles are ground in advance to 4-10mm, and then mixed with 10% of quicklime and 20% of water after grinding and stacked for 24 hours, so that the adverse effect of the lignin contained in the corn cob particles on the retardation of cement is weakened.
Preferably, the anti-shrinkage agent is polyether organic matter and has the function of offsetting the dry shrinkage of the foam concrete caused by the volume reduction of a part of water-absorbing expansion balls after dehydration; the tackifier is chloroprene emulsion or polyvinyl acetate emulsion, and has the effects of greatly improving the viscous force of the foam concrete slurry and reducing the flowing speed, so that the slurry leakage rate of the slurry is reduced; the quick-setting agent adopts a cement concrete additive with strong accelerating action, so that slurry leakage is reduced; the water absorption expansion ball is a product which absorbs more than 300 times of water and can expand to 5-8mm in volume after absorbing water, and the water absorption expansion ball needs to be subjected to pre-water absorption treatment before use; the foam is prepared from a commercially available cement foam concrete foaming agent, the 1-hour foam settlement distance is less than 50mm, the 1-hour bleeding rate is less than 70%, and the solidification settlement rate of the foam concrete slurry is not more than 5%.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the water-absorbing expansion ball combined method mould net cast-in-place foam concrete slurry provided by the invention can effectively prevent the slurry from leaking outside, and in the process of casting the mould net structure in place, the slurry leakage rate of the slurry from the net holes is less than 3%, so that the slurry is in a reasonable space, and the problem of slurry leakage in mould net casting is solved.
2. The water-absorbing expansion ball combined method mould net cast-in-place foam concrete slurry provided by the invention is added with the shrinkage-resistant agent, so that the wall body shrinkage can be effectively reduced.
3. The water-absorbing expansion ball combined method mould net cast-in-place foam concrete slurry provided by the invention does not add polyphenyl granules, the cost of each cubic slurry can be reduced by more than 100 yuan, the economic benefit is obvious, and the aim of reducing the manufacturing cost of the slurry is fulfilled; meanwhile, the problems that polyphenyl particles are not easy to purchase in rural areas and remote areas and fire risks are caused during transportation and use of the polyphenyl particles are solved.
4. The water-absorbing expansion ball combined method mould net cast-in-place foam concrete slurry provided by the invention has the advantages that the foam replaces polyphenyl particles to reduce the density, and the density is controlled according to the addition of the foam, so that the ideal density requirement and heat preservation requirement can be met.
Detailed Description
The present invention is further described in detail below with reference to examples, which are provided to assist those skilled in the art in further understanding the present invention, but are not intended to limit the present invention in any way. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention.
Example 1:
a water-absorbing expansion ball combined method mould net cast-in-place foam concrete slurry comprises the following components in percentage by mass:
90% of cement, 5% of corncob particles, 0.8% of anti-shrinkage agent, 0.2% of thickening agent, 0.03% of tackifier, 2% of quick-setting agent, 0.6% of core material and 0.01% of water-absorbing expansion ball in a dry state;
the water-material ratio of the concrete slurry is 0.6, and the foam consumption is 70% of the slurry volume.
Practice shows that the leakage rate of the slurry from the mesh openings is only 2 percent, and the dry shrinkage rate of the solidified body is less than or equal to 3 mm/m; estimated cost of slurry 256 yuan/m3。
Example 2:
a water-absorbing expansion ball combined method mould net cast-in-place foam concrete slurry comprises the following components in percentage by mass:
95% of cement, 3% of corncob particles, 1.0% of anti-shrinkage agent, 0.15% of thickening agent, 0.02% of tackifier, 1.5% of quick-setting agent, 0.8% of core material and 0.02% of water-absorbing expansion ball in a dry state;
the water-material ratio of the concrete slurry is 0.56, and the foam consumption is 80% of the volume of the slurry.
Practice shows that the leakage rate of the slurry from the meshes is only 1 percent, and the solidification dry shrinkage rate is less than or equal to 4 mm/m; the estimated cost of the slurry is 283 yuan/m 3.
Compared with the prior art, the cast-in-place foam concrete slurry only added with the polyphenyl granules has the slurry leakage rate of more than 5 percent and the solidified dry shrinkage rate of more than 6 mm/m; estimated cost of slurry 425 yuan/m3。
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (8)
1. A water-absorbing expansion ball combined method mould net cast-in-place foam concrete slurry is characterized by comprising the following components:
cement, corncob particles, an anti-shrinkage agent, a thickening agent, a tackifier, a quick-setting agent, a core material, a water-absorbing expansion ball, and also added water and foam.
Wherein, the corncob particles account for 3 to 5 percent by mass, and the water-absorbing expansion balls in a dry state account for 0.01 to 0.02 percent by mass.
2. The water-absorbing expansion ball combined method mould net cast-in-place foam concrete slurry as claimed in claim 1, wherein the mass percentage of each component is as follows:
90 to 95 percent of cement,
0.5 to 1 percent of anti-shrinking agent,
0.1 to 0.3 percent of thickening agent,
0.02 to 0.1 percent of tackifier,
1 to 2 percent of quick-setting agent,
0.5 to 1 percent of core material;
the water-material ratio of the concrete slurry is 0.5-0.6.
3. The water-absorbing expansion ball combined method mould net cast-in-place foam concrete slurry as claimed in claim 2, wherein the mass percentage of each component is as follows: 90% of cement, 5% of corncob particles, 0.8% of anti-shrinkage agent, 0.2% of thickening agent, 0.03% of tackifier, 2% of quick-setting agent, 0.6% of core material and 0.01% of water-absorbing expansion ball in a dry state;
the water-material ratio of the concrete slurry is 0.6, and the foam consumption is 70% of the slurry volume.
4. The water-absorbing expansion ball combined method mould net cast-in-place foam concrete slurry as claimed in claim 2, wherein the mass percentage of each component is as follows: 95% of cement, 3% of corncob particles, 1.0% of anti-shrinkage agent, 0.15% of thickening agent, 0.02% of tackifier, 1.5% of quick-setting agent, 0.8% of core material and 0.02% of water-absorbing expansion ball in a dry state;
the water-material ratio of the concrete slurry is 0.56, and the foam consumption is 80% of the volume of the slurry.
5. The water-absorbing expansion ball combination method mould net cast-in-place foam concrete slurry as claimed in claim 1, wherein the cement is 42.5R ordinary portland cement.
6. The water-absorbing expansion ball combination method mold net cast-in-place foam concrete slurry as claimed in claim 1, wherein the corncob particles adopt: pre-crushing to 4-10mm, mixing with 10% calcium lime and 20% water, and stacking for 24 hr.
7. The water-absorbing expansion ball combined method mould net cast-in-place foam concrete slurry as claimed in claim 1, wherein the anti-shrinkage agent is polyether organic matter.
8. The water-absorbing expansion ball combination method mould net cast-in-place foam concrete slurry as claimed in claim 1, wherein the tackifier is neoprene emulsion or polyvinyl acetate emulsion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011289019.4A CN112374828A (en) | 2020-11-17 | 2020-11-17 | Water-absorbing expansion ball combined method mould net cast-in-place foam concrete slurry |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011289019.4A CN112374828A (en) | 2020-11-17 | 2020-11-17 | Water-absorbing expansion ball combined method mould net cast-in-place foam concrete slurry |
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| CN112374828A true CN112374828A (en) | 2021-02-19 |
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| CN202011289019.4A Pending CN112374828A (en) | 2020-11-17 | 2020-11-17 | Water-absorbing expansion ball combined method mould net cast-in-place foam concrete slurry |
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Citations (7)
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|---|---|---|---|---|
| JPH05294746A (en) * | 1992-04-22 | 1993-11-09 | Kawai Musical Instr Mfg Co Ltd | Foamed concrete, production thereof and concrete building material |
| DE29615484U1 (en) * | 1996-09-05 | 1998-01-08 | Krämer, Walter, 49577 Eggermühlen | Non-combustible thermal insulation boards based on expanded Perlite grit |
| KR20120131936A (en) * | 2011-05-27 | 2012-12-05 | 김은령 | Foam concrete composition, foam concrete and method for preparing the foam concrete |
| CN103979893A (en) * | 2014-05-20 | 2014-08-13 | 同济大学 | Flame-retardant thermal insulation mortar doped with cob cores and preparation method thereof |
| CN107573092A (en) * | 2017-10-24 | 2018-01-12 | 西南科技大学 | A kind of porous material and preparation method thereof |
| CN209227820U (en) * | 2018-09-07 | 2019-08-09 | 马鞍山十七冶工程科技有限责任公司 | A kind of architectural lay wire abnormity wall connecting structure |
| CN110922143A (en) * | 2019-12-20 | 2020-03-27 | 青岛农业大学 | Biomass aggregate recycled concrete and preparation method thereof |
-
2020
- 2020-11-17 CN CN202011289019.4A patent/CN112374828A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05294746A (en) * | 1992-04-22 | 1993-11-09 | Kawai Musical Instr Mfg Co Ltd | Foamed concrete, production thereof and concrete building material |
| DE29615484U1 (en) * | 1996-09-05 | 1998-01-08 | Krämer, Walter, 49577 Eggermühlen | Non-combustible thermal insulation boards based on expanded Perlite grit |
| KR20120131936A (en) * | 2011-05-27 | 2012-12-05 | 김은령 | Foam concrete composition, foam concrete and method for preparing the foam concrete |
| CN103979893A (en) * | 2014-05-20 | 2014-08-13 | 同济大学 | Flame-retardant thermal insulation mortar doped with cob cores and preparation method thereof |
| CN107573092A (en) * | 2017-10-24 | 2018-01-12 | 西南科技大学 | A kind of porous material and preparation method thereof |
| CN209227820U (en) * | 2018-09-07 | 2019-08-09 | 马鞍山十七冶工程科技有限责任公司 | A kind of architectural lay wire abnormity wall connecting structure |
| CN110922143A (en) * | 2019-12-20 | 2020-03-27 | 青岛农业大学 | Biomass aggregate recycled concrete and preparation method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 何廷树: "《混凝土外加剂》", 31 August 2003, 陕西科学技术出版社 * |
| 雍本: "《特种混凝土施工手册》", 30 June 2005, 中国建材工业出版社 * |
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