CN108774019B - Concrete and preparation method of concrete capable of reducing consumption of cementing material - Google Patents
Concrete and preparation method of concrete capable of reducing consumption of cementing material Download PDFInfo
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- CN108774019B CN108774019B CN201810640179.5A CN201810640179A CN108774019B CN 108774019 B CN108774019 B CN 108774019B CN 201810640179 A CN201810640179 A CN 201810640179A CN 108774019 B CN108774019 B CN 108774019B
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- 230000001603 reducing effect Effects 0.000 title claims abstract description 34
- 239000000463 material Substances 0.000 title claims abstract description 32
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 81
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 58
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 30
- 239000010881 fly ash Substances 0.000 claims abstract description 21
- 239000002893 slag Substances 0.000 claims abstract description 21
- 239000004568 cement Substances 0.000 claims abstract description 19
- 239000004576 sand Substances 0.000 claims abstract description 18
- 239000007787 solid Substances 0.000 claims abstract description 5
- 239000004575 stone Substances 0.000 claims description 19
- 239000000654 additive Substances 0.000 claims description 7
- 230000000996 additive effect Effects 0.000 claims description 6
- 239000003570 air Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 7
- 239000003292 glue Substances 0.000 abstract 1
- 239000002245 particle Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 210000002435 tendon Anatomy 0.000 description 1
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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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- Chemical Kinetics & Catalysis (AREA)
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- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides a concrete and a preparation method thereof for reducing the dosage of cementing materials, wherein the concrete comprises cement, fly ash, slag and cementThe preparation method comprises the following steps: s1: determining the calculated water consumption per cubic meter of concrete as follows; s2: the following parameters were determined: water-to-glue ratio; the mass of the water reducing agent and the air entraining agent, and the solid content of the water reducing agent and the air entraining agent; the mixing amount of the water reducing agent and the air entraining agent; the fly ash and the slag respectively account for the proportion delta of the using amount of the cementing materialf、δg(ii) a Water reducing rate beta of water reducing agentsp(ii) a Water reducing ratio beta of air entraining agentae(ii) a The gas content alpha of the concrete; sand rate
S3: calculating the mixing proportion of the concrete according to the data obtained from S1 and S2; s4: the concrete was prepared by mixing according to the mixing ratio in S3. According to the invention, the water reducing effect of the air entraining agent is considered in the proportion calculation of the concrete, so that the using amount of the cementing material is reduced, and the construction cost is reduced.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to concrete and a preparation method of the concrete for reducing the using amount of a cementing material.
Background
In the existing concrete for construction, in order to increase the working performance and reduce the using amount of cementing materials, a proper amount of additives, namely a water reducing agent and an air entraining agent, are usually added into the concrete mixing ratio. Both the admixtures have the water reducing effect, but the water reducing effect of the air entraining agent is often neglected in the mix proportion design, namely the water reducing rate of the air entraining agent is 0, thereby increasing the construction cost.
In practical engineering, such as the preparation of prestressed box girders, the requirements on the early strength and the final strength of concrete are high for the tensioning of subsequent prestressed tendons, and the requirements are more obvious particularly in winter; at the same time, it is desirable for businesses to achieve this goal with a minimum of cementitious material in order to save costs.
Disclosure of Invention
In view of the above situation, the invention provides a concrete and a preparation method of the concrete for reducing the using amount of a cementing material, and solves the technical problems that the using amount of the cementing material is increased and the construction cost is increased due to the fact that the water reducing effect of an air entraining agent is not considered in the existing concrete mixing ratio design.
In order to achieve the purpose, the invention adopts the technical scheme that: the preparation method of the concrete for reducing the using amount of the cementing material is provided, the concrete comprises the cementing material, an additive, water, sand and stone, the cementing material comprises cement, fly ash and slag, the additive comprises a water reducing agent and an air entraining agent, and the preparation method comprises the following steps;
s1: determining the calculated water consumption per cubic meter of concrete as mw0，(kg/m3)；
S2: the following parameters were determined:
the water-to-gel ratio gamma;
mass m of water reducing agent and air entraining agentsp、maeIn units of kg/m3；
Water reducing agent, air entraining agent containing solid content lambdasp、λaeIn units of%;
the mixing amount of the water reducing agent and the air entraining agent is alphasp、αaeIn units of%;
the fly ash and the slag respectively account for the proportion delta of the using amount of the cementing materialf、δgIn units of%;
water reducing rate beta of water reducing agentspIn units of%;
water reducing ratio beta of air entraining agentaeIn units of%;
the air content alpha of the concrete is calculated in units of percent;
sand rate
The unit is%;
s3: calculating the mixing ratio of the concrete according to the data obtained from S1 and S2 through the following formulas (1) to (8);
the formula (1) is the following formula for calculating the mass of the actual water:
Mw＝mw0×(1-βsp-βae)-msp(1-λsp)-mae(1-λae) (1)
the formula (2) is that the mass calculation formula of the cement is as follows:
the mass calculation formula of the fly ash in the formula (3) is as follows:
the formula (4) is that the mass calculation formula of the slag is as follows:
the mass calculation formula of the water reducing agent in the formula (5) is as follows:
Msp＝(Mc+Mf+Mg)×αsp (5)
the formula (6) is that the formula of the mass calculation of the air entraining agent is as follows:
Mae＝(Mc+Mf+Mg)×αae (6)
the formula (7) is the following formula for calculating the mass of the sand:
the mass calculation formula of the stone of the formula (8) is as follows:
in the formula:
Mw、Mc、Mf、Mg、Msp、Mae、Mfa、Mcathe actual consumption of water, cement, fly ash, slag, air entraining agent, sand and stone is kg/m3；
ρw、ρc、ρf、ρg、ρsp、ρae、ρfa、ρcaThe density of water, cement, fly ash, slag, air entraining agent, sand and stone in the existing and improved schemes is kg/m3；
S4: the materials were mixed in the mixing ratio of S3 and mixed to prepare concrete.
In the examples of the present invention, mw0＝226kg/m3、α＝3％、γ＝0.32、δf＝13％、δg＝12％、λsp＝28％、λae＝5.63％，αsp＝1％、αae＝0.3％、βsp＝30％，msp＝4.94kg/m3、mae＝1.48kg/m3The water reducing rate of the air entraining agent ranges from 3% to 7%.
In the embodiment of the invention, the water reducing rate of the air entraining agent is 3%, and the strength of the concrete aged 28 days is 55.7 MPa.
In the embodiment of the invention, the water reducing rate of the air entraining agent is 7%, and the strength of the concrete aged 28 days is 59.2 MPa.
The invention also provides concrete obtained by the preparation method of the concrete with the reduced use amount of the cementing material.
Due to the adoption of the technical scheme, the invention has the following beneficial effects: according to the invention, the water reducing effect of the air entraining agent is considered in the proportion calculation of the concrete, so that the using amount of the cementing material is reduced, the construction cost is reduced, and the concrete obtained by the preparation method has higher strength compared with the prior art.
Drawings
FIG. 1 is a graph of the water reduction rate of the air entraining agent of the present invention versus cost.
Detailed Description
To facilitate an understanding of the present invention, the following description is made in conjunction with the accompanying drawings and examples.
The invention provides a preparation method of concrete for reducing the using amount of a cementing material, the concrete comprises the cementing material, an additive, water, sand and stone, the cementing material comprises cement, fly ash and slag, the additive comprises a water reducing agent and an air entraining agent, and the preparation method comprises the following steps:
s1: determining the calculated water consumption per cubic meter of concrete as mw0，(kg/m3)；
S2: the following parameters were determined:
the water-to-gel ratio gamma;
mass m of water reducing agent and air entraining agentsp、maeIn units of kg/m3；
Water reducing agent, air entraining agent containing solid content lambdasp、λaeIn units of%;
the mixing amount of the water reducing agent and the air entraining agent is alphasp、αaeIn units of%;
the fly ash and the slag respectively account for the proportion delta of the using amount of the cementing materialf、δgIn units of%;
water reducing rate beta of water reducing agentspIn units of%;
water reducing ratio beta of air entraining agentaeIn units of%;
the air content alpha of the concrete is calculated in units of percent;
sand rate
The unit is%;
s3: calculating the mixing ratio of the concrete according to the data obtained from S1 and S2 through the following formulas (1) to (8);
formula (1) the calculation formula for determining the mass of water is as follows:
Mw＝mw0×(1-βsp-βae)-msp(1-λsp)-mae(1-λae) (1)
the formula (2) determines the mass calculation formula of the cement as follows:
the formula (3) determines the mass calculation formula of the fly ash as follows:
the formula (4) determines the mass calculation formula of the slag as follows:
the formula (5) determines the mass calculation formula of the water reducing agent as follows:
Msp＝(Mc+Mf+Mg)×αsp (5)
equation (6) the mass calculation equation for the air entraining agent is determined as:
Mae＝(Mc+Mf+Mg)×αae (6)
equation (7) the mass calculation equation for the air entraining agent is determined as:
equation (8) the mass calculation equation for the air entraining agent is determined as:
in the formula:
Mw、Mc、Mf、Mg、Msp、Mae、Mfa、Mcarespectively the mass of water, cement, fly ash, slag, air entraining agent, sand and stone, and the unit is kg/m3；
ρw、ρc、ρf、ρg、ρsp、ρae、ρfa、ρcaRespectively the densities of water, cement, fly ash, slag, air entraining agent, sand and stone, and the unit is kg/m3(ii) a In the embodiment of the invention, the quality of the air entraining agent and the water reducing agent in the prior art is respectively the same as the basic quality of the air entraining agent and the water reducing agent in the improved scheme.
S4: the materials were mixed in the mixing ratio of S3 and mixed to prepare concrete.
In the embodiment of the invention, the particle size of the stone is 5-10cm and 10-20cm, wherein the proportion of the stone with the particle size of 5-10cm is omega, and the mass of the stone with the particle size of two types can be respectively as follows:
in the formula: mca1、Mca2The mass of the stone is 5-10cm and 10-20cm respectively, and the unit is kg/m3。
Examples
Taking a practical project as an example, assuming that α is 3% and the water-gel ratio is 0.32, the water consumption is calculated to be mw0＝226kg/m3The proportion of the fly ash and the slag respectively occupying the gelled material is deltaf13% and δg12 percent of water reducing agent and air entraining agent respectively have the solid content of lambdasp28% and λae5.63 percent of the total content of the components, and the mixing amount is respectively alpha sp1% and αae0.3 percent and the water reducing rate of the water reducing agent is betasp30 percent, water reducing rate beta of air entraining agentaeUnknown; the densities of water, cement, fly ash, slag, a water reducing agent, an air entraining agent, sand and stone are respectively rhow＝1.0×103kg/m3、ρc＝3.06×103kg/m3、ρf＝2.39×103kg/m3、ρg＝2.83×103kg/m3、ρsp＝1.06×103kg/m3、ρae＝1.004×103kg/m3、ρfa＝2.62×103kg/m3And ρca＝2.72×103kg/m3Sand ratio
The ratio of the stone (5-10cm) is 20%. The symbols of the concrete theoretical mixing ratio of the prior art and the improved scheme are shown in the following table 1.
Table 1 shows the symbols in the theoretical mix proportion of the concrete in the prior art and the modified scheme
| Scheme(s) | Water (W) | Cement | Fly ash | Slag of mine | Water reducing agent | Air entraining agent | Sand | Stone (5-10cm) | Stone (10-20cm) |
| Existing | mw | mc | mf | mg | msp | mae | mfa | mcal | mca2 |
| Improvements in or relating to | Mw | Mc | Mf | Mg | Msp | Mae | Mfa | Mcal | Mca2 |
The calculation formula of the concrete theoretical mixing proportion in the existing scheme is as follows:
mw＝mw0×(1-βsp)-msp(1-λsp)-mae(1-λae)＝153.2
msp＝(mc+mf+mg)×αsp＝4.944
mae＝(mc+mf+mg)×αae＝1.4832
the content expression of each component of the improved scheme is as follows:
Mw＝mw0×(1-βsp-βae)-msq(1-λae)＝153.2-226βae
Msp＝(Mc+Mf+Mg)×αsp＝4.944-7.063βae
Mae＝(Mc+Mf+Mg)×αae＝1.4832-2.1189βae
through investigation, the unit prices of water, cement, fly ash, slag, water reducing agent, air entraining agent, sand and stone on the market are respectively P w5 yuan/ton, Pc317 yuan/ton, Pf238 yuan/ton, Pg320 yuan/ton, Psp3330 Yuan/ton, Pae4000 yuan/ton, Pfa70 yuan/ton, Pcal50 yuan/ton and Pca260 yuan/ton. Cost per cubic concrete saved C (yuan/m)3) Comprises the following steps:
C＝226βae×0.005+529.7βae×0.317+91.8βae×0.238+84.75βae×0.32
+7.063βae×3.33+2.1189βae×4-510.4βae×0.07
-153.1βae×0.05-612.5βae×0.06
＝169.9βae
FIG. 1 is a graph showing the water reduction rate of the air entraining agent as a function of the cost savings per cubic meter of concrete, with the cost savings increasing as the water reduction rate of the air entraining agent increases, such as when the water reduction rate of the air entraining agent is betaaeWhen the concrete is 5 percent, the cost is saved by 8.495 yuan per cubic concrete, and when the water reducing rate beta of the air entraining agent is equal toaeWhen 7%, the cost is saved by 11.893 yuan per cubic meter of concrete.
Theoretically, the water reduction rate beta with the air entraining agentaeWhen the concrete is increased, the working performance of the concrete is gradually reduced when the concrete is mixed, and when the concrete is betaaeWhen the size is too large, the actual construction is difficult, and the concrete prepared by the existing scheme and the improved scheme is described belowβae3% and beta ae7%) compressive strength test results at different ages (1, 3, 7, 10 and 28 days).
Table 3 shows the results of the early-age concrete strength test
The data in table 3 show that the improvement rate of the concrete strength is gradually increased along with the increase of the alkali water rate of the used air entraining agent, and the strength of the concrete is obviously improved compared with that of the concrete in the prior art.
In fact, when betaaeWhen the slump loss is 7 percent, the workability of the concrete begins to decline in the mixing process, the slump of the existing scheme is 230mm in the slump test after the mixing is finished, and the improved scheme (beta) is adoptedae3%) the slump of the concrete was 235mm, and the improvement (beta)ae7%) of the concrete, the slump of the concrete is 210mm at betaaeWhen 7%, the slump of the concrete begins to drop obviously, and when beta isae>When 7 percent of the concrete slump loss is more obvious, the actual construction difficulty is along with betaaeThe increase is gradually increased, so that the method for reducing the using amount of the cementing material and increasing the strength of concrete by considering the water reducing rate of the air entraining agent can only be used at the limited water reducing rate of the air entraining agent {0 }<βae<(βae)maxUse under the theory that for the actual engineering, it is theoretically assumed that (beta)ae)maxShould not be greater than 7% with the corresponding maximum cost savings of 11.893 dollars/cube.
While the present invention has been described in detail and with reference to the accompanying drawings and examples, it will be apparent to one skilled in the art that various changes and modifications can be made therein. Therefore, certain details of the embodiments are not to be interpreted as limiting, and the scope of the invention is to be determined by the appended claims.
Claims (5)
1. A preparation method of concrete for reducing the using amount of cementing materials, wherein the concrete comprises the cementing materials, an additive, water, sand and stone, the cementing materials comprise cement, fly ash and slag, the additive comprises a water reducing agent and an air entraining agent, and the preparation method is characterized by comprising the following steps:
s1: determining the calculated water consumption per cubic meter of concrete as mw0，(kg/m3)；
S2: the following parameters were determined:
the water-to-gel ratio gamma;
mass m of water reducing agent and air entraining agentsp、maeIn units of kg/m3；
Water reducing agent, air entraining agent containing solid content lambdasp、λaeIn units of%;
the mixing amount of the water reducing agent and the air entraining agent is alphasp、αaeIn units of%;
the fly ash and the slag respectively account for the proportion delta of the using amount of the cementing materialf、δgIn units of%;
water reducing rate beta of water reducing agentspIn units of%;
water reducing ratio beta of air entraining agentaeIn units of%;
the air content alpha of the concrete is calculated in units of percent;
sand rate
The unit is%;
s3: calculating the mixing ratio of the concrete according to the data obtained from S1 and S2 through the following formulas (1) to (8);
the formula (1) is the following formula for calculating the mass of the actual water:
Mw＝mw0×(1-βsp-βae)-msp(1-λsp)-mae(1-λae) (1)
the formula (2) is that the mass calculation formula of the cement is as follows:
the mass calculation formula of the fly ash in the formula (3) is as follows:
the formula (4) is that the mass calculation formula of the slag is as follows:
the mass calculation formula of the water reducing agent in the formula (5) is as follows:
Msp＝(Mc+Mf+Mg)×αsp (5)
the formula (6) is that the formula of the mass calculation of the air entraining agent is as follows:
Mae＝(Mc+Mf+Mg)×αae (6)
the formula (7) is the following formula for calculating the mass of the sand:
the mass calculation formula of the stone of the formula (8) is as follows:
in the formula:
Mw、Mc、Mf、Mg、Msp、Mae、Mfa、Mcathe actual consumption of water, cement, fly ash, slag, air entraining agent, sand and stone is kg/m3；
ρw、ρc、ρf、ρg、ρsp、ρae、ρfa、ρcaThe density of water, cement, fly ash, slag, air entraining agent, sand and stone in the existing and improved schemes is kg/m3；
S4: the materials were mixed in the mixing ratio of S3 and mixed to prepare concrete.
2. The method for preparing concrete with reduced cement consumption according to claim 1, wherein m is mw0＝226kg/m3、α＝3％、γ＝0.32、δf＝13％、δg＝12％、λsp＝28％、λae＝5.63％，αsp＝1％、αae＝0.3％、βsp＝30％，msp＝4.94kg/m3、mae＝1.48kg/m3The water reducing rate of the air entraining agent ranges from 3% to 7%.
3. The method for preparing concrete with reduced cement material dosage according to claim 2, characterized in that the water reducing rate of the air entraining agent is 3%, and the strength of concrete aged 28 days is 55.7 MPa.
4. The method for preparing concrete with reduced cement material dosage according to claim 2, characterized in that the water reducing rate of the air entraining agent is 7%, and the strength of concrete aged 28 days is 59.2 MPa.
5. A concrete obtained by the method for producing a concrete with a reduced amount of cementitious material according to claim 1.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8080105B2 (en) * | 2004-07-28 | 2011-12-20 | VCNA Prairie IP, Inc. | Methods of manufacturing and using a flowable cement-based material |
| CN103058606A (en) * | 2012-12-28 | 2013-04-24 | 山西省电力公司 | Concrete mixed with high-volume of slag and coal ash |
| CN105130347A (en) * | 2015-07-10 | 2015-12-09 | 同济大学 | Preparation method of high-work-performance regenerated concrete |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8080105B2 (en) * | 2004-07-28 | 2011-12-20 | VCNA Prairie IP, Inc. | Methods of manufacturing and using a flowable cement-based material |
| CN103058606A (en) * | 2012-12-28 | 2013-04-24 | 山西省电力公司 | Concrete mixed with high-volume of slag and coal ash |
| CN105130347A (en) * | 2015-07-10 | 2015-12-09 | 同济大学 | Preparation method of high-work-performance regenerated concrete |
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