CN115650653A - Method for preparing temporary transition cable pipe arrangement machine-made sand concrete - Google Patents
Method for preparing temporary transition cable pipe arrangement machine-made sand concrete Download PDFInfo
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- CN115650653A CN115650653A CN202211355511.6A CN202211355511A CN115650653A CN 115650653 A CN115650653 A CN 115650653A CN 202211355511 A CN202211355511 A CN 202211355511A CN 115650653 A CN115650653 A CN 115650653A
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- 239000004576 sand Substances 0.000 title claims abstract description 75
- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000007704 transition Effects 0.000 title claims abstract description 16
- 239000004568 cement Substances 0.000 claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 11
- 239000010881 fly ash Substances 0.000 claims abstract description 5
- 239000002994 raw material Substances 0.000 claims abstract description 4
- 238000013461 design Methods 0.000 claims description 10
- 239000011398 Portland cement Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 description 10
- 238000012360 testing method Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 239000002245 particle Substances 0.000 description 5
- 239000004575 stone Substances 0.000 description 5
- 239000000843 powder Substances 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
Abstract
The invention discloses a method for preparing temporary transition cable pipe arrangement machine-made sand concrete, which comprises the following steps: selecting a cement variety according to the requirements of the strength and the water-cement ratio of the machine-made sand concrete; determining the sand rate and the optimal replacement rate of the machine-made sand according to the concrete strength and the slump; selecting a water reducing agent according to the requirements of workability and setting time; adjusting the metering of a water reducing agent in the machine-made sand concrete according to the working performance of the concrete; calculating the mixing proportion according to the selected raw material cement variety, the fly ash mixing amount and the sand rate in the concrete; performing concrete trial mixing according to the calculated selected mixing proportion, performing reasonable adjustment, and determining the final concrete mixing proportion; compared with the prior art, the method has the advantages of simple steps, small calculated amount and wide application.
Description
Technical Field
The invention relates to the field of cable ducts in power engineering, in particular to a method for preparing machine-made sand concrete for temporary transition cable ducts.
Background
Natural sand resources in China are unevenly distributed, and along with continuous exploitation, natural sand is gradually in shortage, so that the demand of modern engineering is difficult to meet. The machine-made sand is sand processed by a sand making machine and other accessory equipment, and is rock particles with the particle size of less than 4.75mm, wherein the rock particles with the particle size of less than 0.075mm are called stone powder, and the rock particles are prepared by mechanical crushing and screening. The material characteristics, performance and other aspects of the machine-made sand are greatly different from those of natural sand concrete. Compared with common natural sand concrete, the machine-made sand concrete has poorer working performance, and impurities such as stone powder and the like can cause the segregation phenomenon of a freshly mixed mixture of the machine-made sand concrete, but the mechanical property of the machine-made sand concrete can be improved due to the filling effect of the stone powder and the like; for durability, the machine-made sand concrete is mixed with different materials, so that the durability performance of the machine-made sand concrete is obviously different. Therefore, the temporary transition cable duct arrangement machine sand concrete mixing ratio is designed by comprehensively considering the characteristics of the machine-made sand.
In the electric power engineering, a C30 concrete small-scale pipe arrangement mode is generally adopted for temporary transition cable engineering, when C30 mechanism sand concrete mix proportion design is carried out on the temporary transition cable pipe arrangement, mechanism sand is configured instead of natural sand according to the quality such as the optimal replacement rate to avoid the segregation phenomenon, the advantage that the mechanism sand improves the strength of concrete can be given play to, the durability of concrete can be guaranteed, and the like.
Disclosure of Invention
The invention aims to provide a method for preparing machine-made sand concrete for temporary transition cable tube-arranging machine.
In order to solve the technical problems, the invention adopts the technical scheme that: a method for preparing temporary transition cable tube arranging machine-made sand concrete comprises the following steps:
step 1: selecting a cement variety according to the requirements of the strength and the water-cement ratio of the machine-made sand concrete;
and 2, step: determining the sand rate and the optimal replacement rate of the machine-made sand according to the concrete strength and the slump;
and 3, step 3: selecting a water reducing agent according to the requirements of workability and setting time;
and 4, step 4: adjusting the metering of a water reducing agent in the machine-made sand concrete according to the working performance of the concrete;
and 5: calculating the mixing proportion according to the selected raw material cement variety, the fly ash mixing amount and the sand rate in the concrete;
step 6: performing concrete trial mixing according to the calculated selected mixing proportion, performing reasonable adjustment, and determining the final concrete mixing proportion;
preferably, the selection of the cement variety in step 1 further comprises: 42.5-grade ordinary portland cement (p.o 42.5) produced by tangshan Jidong cement gmbh, the various performance parameters of which are shown in table 1:
TABLE 1 Cement physical Properties
Preferably, according to JGJ 55-2011 "design rule for mix proportion of general concrete", the strength of the machine-made sand concrete in the step 1 is obtained by the following formula:
wherein fcu,0 is not less than fcu, k +1.645 sigma
fcu, 0-concrete trial strength MPa; fcu, k-concrete design strength 30 (MPa); the standard deviation of sigma is 5.0MPa; 1.645-the coefficient of assurance when the concrete strength reaches 95% assurance.
Preferably, the water-cement ratio of the machine-made sand concrete in the step 1 is obtained by the following formula:
wherein W/C is the water-cement ratio of concrete, a a 、a b Is a regression coefficient, f b Strength (MPa) of the cement;
preferably, the regression coefficient a a The value is 0.53, and the regression coefficient a b The value is 0.2, which is the 28-day strength (MPa) of the cementing material;
preferably, the step 2 of determining the sand rate and the optimal replacement rate of the machine-made sand further comprises: in the step 2, the sand rate is determined to be 38%, and the optimal replacement rate of the machine-made sand is determined to be 60%.
Preferably, the concrete mixing time in the step 6 is 120s-150s.
The invention has the beneficial effects that:
(1) The method has simple steps, small calculated amount and wide application;
(2) The invention adopts the quality of the machine-made sand and the like to replace the natural sand, firstly selects the cement variety through the related experiments, determines the sand rate and the optimal replacement rate of the machine-made sand according to the experiments, and then calculates the mixing proportion according to the related specifications, thereby being suitable for the preparation of the machine-made sand concrete of the temporary transition cable pipe arrangement.
Detailed Description
A method for preparing temporary transition cable pipe arrangement machine-made sand concrete comprises the following steps:
step 1: selecting a cement variety according to the requirements of the strength and the water-cement ratio of the machine-made sand concrete;
according to JGJ 55-2011 'design rule for mixing proportion of common concrete', the preparation strength of the concrete is determined by adopting the following formula:
fcu,0≥fcu,k+1.645σ＝30+1.645×5.0＝38.2(MPa)
in the formula, fcu, 0-concrete trial strength MPa; fcu, k-concrete design strength 30 (MPa); the standard deviation of sigma is 5.0MPa; 1.645-the assurance rate coefficient when the concrete strength reaches 95% assurance rate;
step 2: determining the sand rate and the optimal replacement rate of the machine-made sand according to the concrete strength and the slump, wherein the sand rate is 38% and the optimal replacement rate of the machine-made sand is 60%;
and step 3: selecting a water reducing agent according to the requirements of workability and setting time;
and 4, step 4: adjusting the metering of a water reducing agent in the machine-made sand concrete according to the working performance of the concrete;
and 5: calculating the mixing proportion according to the selected raw material cement variety, the fly ash mixing amount and the sand rate in the concrete; the method comprises the following calculation steps:
1. determining the water-gel ratio: (W/C)
(1) Cement strength: (f) ce )
f ce ＝γ c f ce g ＝1.10×42.5＝46.8MPa
In the formula, 1.10-surplus coefficient of cement strength grade value
f ce Cement strength rating value MPa
(2) Strength of the cementing material:(f b )
f b ＝γ f γ s fce＝1.00×1.00×46.8＝46.8MPa
in the formula, gamma f 、γ s -a fly ash impact coefficient and a granulated blast furnace slag impact coefficient. The proportion does not relate to external admixture and is according to the standard gamma f 、γ s Values are all 1.00.
Because the water-gel ratio exceeds the design specification limit value of the durability of the cable engineering concrete, the water-gel ratio is determined to be 0.42 according to the specification value, namely W/C =0.42;
2. determining the unit water consumption (m) wo )
M is determined by tests according to the grain diameter of stone materials, design requirements and the mixing amount of the water reducing agent wo 216kg/m was selected 3 (ii) a (admixture mixing amount is 1.2%, water reducing rate is 27.0%)
m co ＝216×(1－27％)＝158kg/m 3 ；
3. Calculating the unit dosage of the cementing material (m) c0 )
m c0 ＝m wo ÷W/C＝158/0.42＝376kg/m 3 ；
4. Determining the unit water reducing agent dosage: (m) a0 )
m a0 ＝m c0 ×1.2％＝376×1.2％＝4.51kg/m 3 ；
5. Determining the sand rate: (beta) s )
Slump, the compositions of coarse and fine aggregates and the fineness modulus, beta, of the fine aggregates according to design requirements s 38 percent of the total weight of the machine-made sand and the like is taken to replace the natural sand rate by 60 percent.
6. Calculating the unit dosage of coarse and fine aggregates by adopting an assumed mass method: (m) s0 、m g0 )
Assuming the mixture weight per unit (m) cp ) Is 2400kg/m 3 According to the following formula:
the simultaneous (1) and (2) formulas are solved: m is s0 ＝709kg/m 3 m g0 ＝1157kg/m 3
7. The preliminary reference mixing proportion is as follows:
cement: and (3) machining sand: natural sand: breaking stone: water: water reducing agent
376：425.4：283.6：1157：158：4.51
1：1.134:0.756：3.08：0.42：0.012；
8. The mixing proportion according to the reference mixing proportion and the two adjusting mixing proportions is respectively as follows: W/C. + -. 0.02,. Beta s ±1％。
(see Table 2)
TABLE 2 adjustment of the mixing ratio (unit: kg/m) 3 )
9. And (3) performing a concrete mixture performance test on the mixing ratio, wherein the concrete mixture performance after the mixing ratio of the test concrete is as follows: (see Table 3)
TABLE 3 concrete mixture test results
10. Concrete compressive strength test results: (see Table 4)
TABLE 4 concrete compressive Strength test results
And 6: and (3) performing concrete trial mixing according to the selected mixing proportion, performing reasonable adjustment, and determining the final concrete mixing proportion: after the concrete mixture is uniformly stirred, a slump test is carried out, and the slump is measured to be 200mm, and the cohesiveness and the water-retaining property are good.
Actually measured apparent density m of concrete mixture cp ＝2400kg/m 3 The absolute value of the difference from the calculated value is not more than 2% of the calculated value, and the reference ratio is kept unchanged.
According to the test results, under the condition of meeting the design and construction requirements, the theoretical mixing proportion of the concrete is determined according to the economic, economical and optimal principles: (Table 5) theoretical mixing ratio (kg/m) of concrete and sand in C30 machine-made sand in Table 5 3 )
Claims (6)
1. A method for preparing temporary transition cable pipe arrangement machine-made sand concrete is characterized by comprising the following steps:
s1: selecting a cement variety according to the requirements of the strength and the water-cement ratio of the machine-made sand concrete;
s2: determining the sand rate and the optimal replacement rate of the machine-made sand according to the concrete strength and the slump;
s3: selecting a water reducing agent according to the requirements of workability and setting time;
s4: adjusting the metering of a water reducing agent in the machine-made sand concrete according to the working performance of the concrete;
s5: calculating the mixing proportion according to the selected raw material cement variety, the fly ash mixing amount and the sand rate in the concrete;
s6: and (4) performing concrete trial mixing according to the selected mixing proportion, performing reasonable adjustment, and determining the final concrete mixing proportion.
2. The method as claimed in claim 1, wherein the cement type in step S1 is 42.5 grade Portland cement manufactured by cement corporation of tangshan east.
3. The method for preparing the mechanical sand concrete for the temporary transition cable duct laying according to claim 1, wherein the strength of the mechanical sand concrete in the step S1 is obtained by the following formula:
fcu,0≥fcu,k+1.645σ
in the formula, fcu, 0-concrete trial strength; design strength of fcu, k-concrete; sigma-standard deviation; 1.645-the coefficient of assurance when the concrete strength reaches 95% assurance.
4. The method for preparing the machine-made sand concrete for the temporary transition cable duct arrangement according to claim 1, wherein the water-to-cement ratio of the machine-made sand concrete in the step S1 is obtained by the following formula:
wherein W/C is the water-cement ratio of concrete, a a 、a b Is a regression coefficient, f b Is the strength of the cement.
5. The method for preparing machine-made sand concrete for temporary transition cables according to claim 1, wherein the sand rate determined in step S2 is 38%, and the optimal replacement rate of machine-made sand is 60%.
6. The method for preparing sand concrete for a temporary transition cable duct machine according to claim 1, wherein the concrete mixing time in the step 6 is 120s-150s.
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| CN202211355511.6A CN115650653A (en) | 2022-11-01 | 2022-11-01 | Method for preparing temporary transition cable pipe arrangement machine-made sand concrete |
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| CN202211355511.6A CN115650653A (en) | 2022-11-01 | 2022-11-01 | Method for preparing temporary transition cable pipe arrangement machine-made sand concrete |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109265110A (en) * | 2018-11-12 | 2019-01-25 | 中国十七冶集团有限公司 | A kind of highway engineering high-performance machine-made sand concrete preparation method |
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- 2022-11-01 CN CN202211355511.6A patent/CN115650653A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109265110A (en) * | 2018-11-12 | 2019-01-25 | 中国十七冶集团有限公司 | A kind of highway engineering high-performance machine-made sand concrete preparation method |
Non-Patent Citations (1)
| Title |
|---|
| 邓翀等: "机制砂掺量对混凝土力学性能和体积稳定性的影响研究", 《新型建筑材料》 * |
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Application publication date: 20230131 |