CN112430020A - Preparation process of viscosity-modified concrete - Google Patents
Preparation process of viscosity-modified concrete Download PDFInfo
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- CN112430020A CN112430020A CN202011392770.7A CN202011392770A CN112430020A CN 112430020 A CN112430020 A CN 112430020A CN 202011392770 A CN202011392770 A CN 202011392770A CN 112430020 A CN112430020 A CN 112430020A
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- concrete
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- cement
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Classifications
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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
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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
- C04B2111/20—Resistance against chemical, physical or biological attack
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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
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
Abstract
The invention discloses a preparation process of concrete with modified viscosity, which is characterized by comprising cement, fly ash, sand, broken stone, water reducing agent, modified viscosity agent and water in parts by weight, wherein the viscosity modifying material is doped, the particle size of the cement is smaller than that of the cement, the average particle size of the cementing material can be reduced by replacing the cement, gaps among cement particles can be filled, the compactness of the concrete is increased, the viscosity and the pressure bleeding rate of cement paste in the concrete are reduced, the fluidity of a mixture is improved, the pumping pressure is reduced and the pumping loss is reduced when the super high-rise concrete is pumped.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to a preparation process of viscosity-modified concrete.
Background
When the concrete is pumped in a super high-rise building, the pumping pressure is increased along with the gradual increase of the pumping height, and the concrete strength grade of the high-rise building is high and the viscosity is high, so that the pumping construction difficulty is greatly increased, and a plurality of concrete construction problems which need to be solved urgently are brought.
When the ultra-high-rise concrete is pumped, a construction process of one-time pumping to the top is usually adopted, the using amount of a high-strength concrete cementing material is large, the viscosity is relatively large, the pumpability of the concrete needs to be improved if the high-strength concrete is smoothly pumped to a specified height, and the key is to reduce the viscosity of the concrete, so that the pumping pressure is reduced, and the pumping loss is reduced. The viscosity of the high-strength concrete is properly reduced, the fluidity of the concrete is improved, but when the fluidity is too high, phenomena such as segregation and bleeding are easy to occur, and the concrete is required to have good fluidity and have the capabilities of segregation and bleeding resistance. The concrete is transported from the mixing plant to a construction site, and is transported for a long distance and a long time, so that the slump loss and the expansion loss of the concrete are not large, and the concrete also needs to have strong slump retention and plasticity retention in order to ensure that the pumping performance of the concrete is good.
Therefore, the concrete is prepared by adding a certain amount of the modified viscosity agent, so that the concrete is suitable for the pumping problem of the ultra-high-rise concrete.
Disclosure of Invention
The invention provides a preparation process of concrete with modified viscosity, and aims to provide a preparation process of concrete with modified viscosity, which has good mixture fluidity and reduces the pressure bleeding rate and the segregation rate of the concrete.
The invention is realized by the following technical scheme:
the invention specifically provides a preparation process of concrete with modified viscosity, which is characterized by comprising, by weight, 94-112 parts of cement, 9-29 parts of fly ash, 51-98 parts of sand, 52-102 parts of broken stone, 2-5 parts of a water reducing agent, 5-15 parts of a modified viscosity agent and 21-39 parts of water.
Preferably, the cement mortar comprises 102 parts of cement, 15 parts of fly ash, 71 parts of sand, 79 parts of crushed stone, 3 parts of water reducing agent, 9 parts of modified viscosity agent and 28 parts of water.
Preferably, the deep makeup removing and repairing water provided by the invention comprises 809 parts by weight of deionized water, 100 parts by weight of butanediol, 57 parts by weight of neopentyl glycol dicaprate, 6 parts by weight of fructo-oligosaccharide, 6 parts by weight of hexyl decanoic acid (and) apple (PYRUS MALUS) seed extract, 5 parts by weight of palmitoyl tripeptide-1, 8 parts by weight of babassu seed oil glyceryl polyether-8 esters, 3 parts by weight of caprylyl glycol, 2 parts by weight of sodium hyaluronate, 2 parts by weight of Tremella FUCIFORMIS (Tremella FUCIFORMIS) polysaccharide and 2 parts by weight of ethylhexyl glycerin.
More preferably, the sand is artificial sand, the fineness modulus is 2.75, and the apparent density is 2643kg/m3The mud content was 0.86%.
More preferably, the crushed stone is 4-22mm continuous graded crushed stone, and the apparent density is 2721kg/m3The crushing value is 7.89%, the mud content is0.48 percent and 4.8 percent of needle sheet-shaped content.
More preferably, in the preparation process of the concrete with the modified viscosity, the water reducing agent is a polycarboxylic acid high-performance water reducing agent, and the water reducing rate is 31.8%.
More preferably, in the preparation process of the concrete with modified viscosity provided by the invention, the modified viscosity agent is a HYDF modified viscosity material.
Meanwhile, the invention provides a preparation process of the concrete with modified viscosity, which specifically comprises the following technical steps:
(1) pouring 5-11 parts of water into a stirrer for pre-wetting;
(2) after the fly ash, the water reducing agent and the modified viscosity agent are poured, the rotating speed of the stirrer is 150-;
(3) and finally, uniformly mixing the cement, the sand and the broken stone, slowly pouring the mixture into a stirrer, reducing the rotating speed of the stirrer to 110r/min, and stirring for 1.5-2.5h to obtain the concrete.
By implementing the technical scheme of the invention, the following beneficial effects can be achieved:
(1) the invention provides a preparation process of concrete with modified viscosity, which is characterized in that a viscosity modifying material is doped, the particle size of the viscosity modifying material is smaller than that of cement, the average particle size of a cementing material can be reduced by replacing the cement, gaps among cement particles can be filled, the compactness of the concrete is increased, and the viscosity and the pressure bleeding rate of cement paste in the concrete are reduced.
(2) According to the invention, the modified viscosity material is added before the cement and the broken stone are added, so that gaps among cement particles and gel products can be effectively filled, the porosity of the concrete is reduced, the aperture is reduced, a possibly formed permeation channel is blocked, secondary hydration reaction can be carried out with a cement hydration product calcium hydroxide, and a weak interface transition area is strengthened, thereby improving the anti-chloride ion permeability of the concrete, reducing the drying shrinkage rate, and simultaneously, the drying shrinkage rate is further reduced because the modified viscosity material replaces the cement to reduce the content of the hydration product.
Detailed Description
The present invention will be described below by way of examples, but the present invention is not limited to the following examples.
The raw materials adopted by the invention can be purchased through public channels, the equipment and instruments adopted in the process are common equipment in the field, but the implementation of the invention is not limited, and other reagents and equipment which are well known in the field can be suitable for the implementation of the following embodiment of the invention.
The first embodiment is as follows:
a preparation process of concrete with modified viscosity comprises the following steps of 94 parts of cement, 10 parts of fly ash, 60 parts of sand, 65 parts of broken stone, 2 parts of a water reducing agent, 6 parts of a modified viscosity agent and 23 parts of water in parts by weight.
In this embodiment, the preparation process of the viscosity-modified concrete includes the following specific steps: pouring 7 parts of water into a stirrer for pre-wetting; after the fly ash, the water reducing agent and the modified viscosity agent are poured, the rotating speed of a stirrer is 165r/min, then the rest water is injected, and the mixture is stirred for 38min until the mixture is uniformly mixed; and finally, uniformly mixing the cement, the sand and the broken stone, slowly pouring the mixture into a stirrer, reducing the rotating speed of the stirrer to 110r/min, and stirring for 1.7h to obtain the concrete.
Example two:
the preparation process of the concrete with the modified viscosity comprises the following steps of 100 parts of cement, 13 parts of fly ash, 65 parts of sand, 70 parts of broken stone, 2 parts of a water reducing agent, 7 parts of a modified viscosity agent and 24 parts of water in parts by weight.
In this embodiment, the preparation process of the viscosity-modified concrete includes the following specific steps: pouring 7 parts of water into a stirrer for pre-wetting; after the fly ash, the water reducing agent and the modified viscosity agent are poured, the rotating speed of a stirrer is 180r/min, then the rest water is injected, and the mixture is stirred for 34min until the mixture is uniformly mixed; and finally, uniformly mixing the cement, the sand and the broken stone, slowly pouring the mixture into a stirrer, reducing the rotating speed of the stirrer to 110r/min, and stirring for 1.9h to obtain the concrete.
Example three:
a preparation process of concrete with modified viscosity comprises, by weight, 102 parts of cement, 15 parts of fly ash, 71 parts of sand, 79 parts of broken stone, 3 parts of a water reducing agent, 9 parts of a modified viscosity agent and 28 parts of water.
In this embodiment, the preparation process of the viscosity-modified concrete includes the following specific steps: pouring 8 parts of water into a stirrer for pre-wetting; after the fly ash, the water reducing agent and the modified viscosity agent are poured, the rotating speed of a stirrer is 200r/min, then the rest water is injected, and the stirring is carried out for 30min until the mixture is uniformly mixed; and finally, uniformly mixing the cement, the sand and the broken stone, slowly pouring the mixture into a stirrer, reducing the rotating speed of the stirrer to 110r/min, and stirring for 2 hours to obtain the concrete.
Example four:
a preparation process of concrete with modified viscosity comprises, by weight, 105 parts of cement, 20 parts of fly ash, 82 parts of sand, 88 parts of broken stone, 4 parts of a water reducing agent, 11 parts of a modified viscosity agent and 31 parts of water.
In this embodiment, the preparation process of the viscosity-modified concrete includes the following specific steps: pouring 9 parts of water into a stirrer for pre-wetting; after the fly ash, the water reducing agent and the modified viscosity agent are poured, the rotating speed of a stirrer is 210r/min, then the rest water is injected, and the mixture is stirred for 28min until the mixture is uniformly mixed; and finally, uniformly mixing the cement, the sand and the broken stone, slowly pouring the mixture into a stirrer, reducing the rotating speed of the stirrer to 110r/min, and stirring for 2.3 hours to obtain the concrete.
Example five:
the preparation process of the concrete with the modified viscosity comprises the following steps of 110 parts of cement, 24 parts of fly ash, 91 parts of sand, 95 parts of broken stone, 5 parts of a water reducing agent, 13 parts of a modified viscosity agent and 37 parts of water in parts by weight.
In this embodiment, the preparation process of the viscosity-modified concrete includes the following specific steps: pouring 11 parts of water into a stirrer for pre-wetting; after the fly ash, the water reducing agent and the modified viscosity agent are poured, the rotating speed of a stirrer is 245r/min, then the rest water is injected, and the mixture is stirred for 26min until the mixture is uniformly mixed; and finally, uniformly mixing the cement, the sand and the broken stone, slowly pouring the mixture into a stirrer, reducing the rotating speed of the stirrer to 110r/min, and stirring for 2.4 hours to obtain the concrete.
Example six:
table 1: influence of mixing amount of materials with different modified viscosities on viscosity of cement paste
As can be seen from table 1, since the viscosity of the neat cement paste significantly decreased as the viscosity-modified material was added, the viscosity of the reference neat cement paste was 1259mPa · s, and the viscosities of the first to fifth blended viscosity-modified materials were 732, 718, 706, 699, and 689mPa · s, respectively, the viscosity ratios were calculated to be 58%, 57%, 56%, 55.5%, and 54.7%, respectively.
Example seven:
table 2: working performance of super high-rise pumping concrete
As can be seen from table 2, the initial slump and the expansion of the concrete in the first embodiment of the present invention are 250 and 620mm, the emptying time of the tumbler is 11.5s, the initial slump and the expansion of the concrete in the second embodiment are 255 and 630mm, respectively, the emptying time of the tumbler is 10.2s, the initial slump and the expansion of the concrete in the third embodiment are 260 and 640mm, the emptying time of the tumbler is 9.8s, the initial slump and the expansion of the concrete in the fourth embodiment are 270 and 635mm, the emptying time of the tumbler is 9.1s, the initial slump and the expansion of the concrete in the third embodiment are 280 and 645mm, the emptying time of the tumbler is 8.7s, while the initial slump and the expansion of the concrete without the modified viscosity material are 230 and 550mm, and the emptying time of the tumbler is 17.1 s. The concrete cementing material has large using amount, small water-cement ratio, poor workability of the whole system, large viscosity and small viscosity modifying material particles, is mostly spherical particles, can fill gaps among cement particles, enables free water to be discharged, increases the fluidity of a mixture and reduces the viscosity.
Example eight:
table 3: mechanical property and durability of super high-rise pumping concrete
As can be seen from Table 3, the compressive strength of example III at 28d was slightly improved, and the compressive strength of concrete was not substantially affected by the other examples. The modified viscosity material improves the pore structure of concrete, reduces the porosity, reduces the size of most probable pore diameter, enables the concrete to form a self-compact stacking system with a compact filling structure and a fine layer, plays a role of a microcrystalline core effect in a cement hydration system, can accelerate the progress of cement hydration reaction, provides a sufficient space for hydration products, improves the distribution uniformity of the cement hydration products, enables a cement stone structure to be more compact, and improves the mechanical strength of the concrete by adding a proper amount of the modified viscosity material.
As described above, the present invention can be preferably implemented, and the above-mentioned embodiments only describe the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various changes and modifications of the technical solution of the present invention made by those skilled in the art without departing from the design spirit of the present invention shall fall within the protection scope defined by the present invention.
Claims (7)
1. The preparation process of the concrete with the modified viscosity is characterized by comprising, by weight, 94-112 parts of cement, 9-29 parts of fly ash, 51-98 parts of sand, 52-102 parts of gravel, 2-5 parts of a water reducing agent, 5-15 parts of a modified viscosity agent and 21-39 parts of water.
2. The process for preparing concrete with modified viscosity according to claim 1, wherein 102 parts of cement, 15 parts of fly ash, 71 parts of sand, 79 parts of gravel, 3 parts of water reducing agent, 9 parts of modified viscosity agent and 28 parts of water are calculated according to parts by weight.
3. The process for preparing a concrete of modified viscosity according to claim 1, wherein said sand isIs artificial sand with fineness modulus of 2.75 and apparent density of 2643kg/m3The mud content was 0.86%.
4. The process for preparing a concrete of modified viscosity according to claim 1, wherein said crushed stone is a 4-22mm continuous graded crushed stone having an apparent density of 2721kg/m3The crushing value was 7.89%, the content of sludge was 0.48%, and the content of needle-like pieces was 4.8%.
5. The process for preparing concrete with modified viscosity according to claim 1, wherein the water reducing agent is a polycarboxylic acid high performance water reducing agent, and the water reducing rate is 31.8%.
6. The process of claim 1, wherein said viscosity modifier is a HYDF viscosity modifier.
7. The process for preparing a concrete with modified viscosity according to claim 1, characterized in that the following technical steps are specifically adopted:
(1) pouring 5-11 parts of water into a stirrer for pre-wetting;
(2) after the fly ash, the water reducing agent and the modified viscosity agent are poured, the rotating speed of the stirrer is 150-;
(3) and finally, uniformly mixing the cement, the sand and the broken stone, slowly pouring the mixture into a stirrer, reducing the rotating speed of the stirrer to 110r/min, and stirring for 1.5-2.5h to obtain the concrete.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011392770.7A CN112430020A (en) | 2020-12-01 | 2020-12-01 | Preparation process of viscosity-modified concrete |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011392770.7A CN112430020A (en) | 2020-12-01 | 2020-12-01 | Preparation process of viscosity-modified concrete |
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| CN112430020A true CN112430020A (en) | 2021-03-02 |
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| CN202011392770.7A Pending CN112430020A (en) | 2020-12-01 | 2020-12-01 | Preparation process of viscosity-modified concrete |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5352290A (en) * | 1991-06-25 | 1994-10-04 | Jdc Corporation | Concrete composition |
| CN1844027A (en) * | 2006-04-20 | 2006-10-11 | 福建省大地管桩有限公司 | Method for preparing high-intensity concrete |
| CN1844028A (en) * | 2006-04-20 | 2006-10-11 | 福建省大地管桩有限公司 | Method for preparing high-intensity concrete |
| CN105155373A (en) * | 2015-09-02 | 2015-12-16 | 中国铁道科学研究院铁道建筑研究所 | Self compact concrete fast moving production and construction method for CRTSIII type ballastless track |
| CN106336136A (en) * | 2016-08-22 | 2017-01-18 | 中国路桥工程有限责任公司 | Vibration damping function concrete used for sleepers |
| CN106517957A (en) * | 2016-11-22 | 2017-03-22 | 江苏苏博特新材料股份有限公司 | Concrete with common strength and high elastic modulus and preparation method thereof |
| CN110357538A (en) * | 2019-08-01 | 2019-10-22 | 西安新意达建筑制品有限公司 | A kind of regeneration self-compacting concrete and preparation method thereof |
-
2020
- 2020-12-01 CN CN202011392770.7A patent/CN112430020A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5352290A (en) * | 1991-06-25 | 1994-10-04 | Jdc Corporation | Concrete composition |
| CN1844027A (en) * | 2006-04-20 | 2006-10-11 | 福建省大地管桩有限公司 | Method for preparing high-intensity concrete |
| CN1844028A (en) * | 2006-04-20 | 2006-10-11 | 福建省大地管桩有限公司 | Method for preparing high-intensity concrete |
| CN105155373A (en) * | 2015-09-02 | 2015-12-16 | 中国铁道科学研究院铁道建筑研究所 | Self compact concrete fast moving production and construction method for CRTSIII type ballastless track |
| CN106336136A (en) * | 2016-08-22 | 2017-01-18 | 中国路桥工程有限责任公司 | Vibration damping function concrete used for sleepers |
| CN106517957A (en) * | 2016-11-22 | 2017-03-22 | 江苏苏博特新材料股份有限公司 | Concrete with common strength and high elastic modulus and preparation method thereof |
| CN110357538A (en) * | 2019-08-01 | 2019-10-22 | 西安新意达建筑制品有限公司 | A kind of regeneration self-compacting concrete and preparation method thereof |
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Application publication date: 20210302 |