CN111423165A - Roller compacted concrete for hydropower station engineering - Google Patents
Roller compacted concrete for hydropower station engineering Download PDFInfo
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- CN111423165A CN111423165A CN202010250709.2A CN202010250709A CN111423165A CN 111423165 A CN111423165 A CN 111423165A CN 202010250709 A CN202010250709 A CN 202010250709A CN 111423165 A CN111423165 A CN 111423165A
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- 239000011382 roller-compacted concrete Substances 0.000 title claims abstract description 131
- 239000010881 fly ash Substances 0.000 claims abstract description 70
- 239000004568 cement Substances 0.000 claims abstract description 57
- 239000004576 sand Substances 0.000 claims abstract description 55
- 239000004575 stone Substances 0.000 claims abstract description 54
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 45
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 22
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 21
- 239000002994 raw material Substances 0.000 claims abstract description 20
- 238000002156 mixing Methods 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 6
- 239000004567 concrete Substances 0.000 abstract description 17
- 230000036571 hydration Effects 0.000 abstract description 13
- 238000006703 hydration reaction Methods 0.000 abstract description 13
- 230000008901 benefit Effects 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 3
- 230000001934 delay Effects 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 9
- 239000000203 mixture Substances 0.000 description 9
- 238000012360 testing method Methods 0.000 description 9
- 238000009472 formulation Methods 0.000 description 7
- 239000010883 coal ash Substances 0.000 description 6
- 238000001816 cooling Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 238000010276 construction Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 230000000704 physical effect Effects 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 238000005336 cracking Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 229920005646 polycarboxylate Polymers 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000000979 retarding effect Effects 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 230000002528 anti-freeze Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003020 moisturizing effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000008030 superplasticizer Substances 0.000 description 1
- 230000001550 time effect Effects 0.000 description 1
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
-
- 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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- 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 relates to the technical field of roller compacted concrete, in particular to roller compacted concrete for hydropower station dam engineering, which is prepared from the following raw materials in parts by mass: 66-70 parts of water, 43.4-55.3 parts of cement, 117.3-138.2 parts of fly ash, 707-788 parts of artificial sand, 0-540 parts of large broken stone, 774-885 parts of medium broken stone, 486-542 parts of small broken stone, 1.30-1.38 parts of water reducing agent and 0.24-0.26 part of air entraining agent. The effective hydration heat that reduces of roller compacted concrete of this application reduces roller compacted concrete early hydration heat, delays the appearance of the second exothermic peak, reaches the slow setting effect, does benefit to the control by temperature change of bulky concrete, effectively avoids solidifying the back fracture.
Description
Technical Field
The invention relates to the technical field of roller compacted concrete, in particular to roller compacted concrete for hydropower station dam engineering.
Background
Hydropower station dams are often built in relatively marginal environments, hydropower station projects generally encounter climatic characteristics of high temperature in summer, low temperature in winter, large early-late temperature difference and humidity change, strong solar radiation, large wind and the like, so that the requirement on the quality of roller compacted concrete is high.
In actual construction, because the roller compacted concrete has large volume and overhigh hydration heat, the roller compacted concrete block is easy to crack or crack, in the prior art, measures of cooling by cold air through an air conditioner, moisturizing and cooling by spraying on a warehouse surface, thermal insulation and heat preservation by heat insulation and constant temperature control by cooling water are generally adopted, however, because the initial hydration heat of the roller compacted concrete is high, the temperature control measures in high temperature seasons are complex, the cost is high, and the anti-cracking performance is general.
For roller compacted concrete, the most important performance requirements are that the hydration temperature rise is low, the cracking resistance is strong, and the workability is good, and the main approaches to achieve the basic requirements are to try to reduce the internal temperature rise of the concrete, improve the tensile strength and the ultimate tensile value of the concrete, improve the creep degree of the concrete, reduce the early elastic modulus and the thermal expansion coefficient of the concrete, and the like. The research and development of new roller compacted concrete materials, the design of mixing proportion, the quality control and other aspects are in urgent need.
Disclosure of Invention
The present invention is directed to solving at least one of the above problems.
The invention aims to at least provide the roller compacted concrete which can effectively reduce hydration heat, reduce early hydration heat of the roller compacted concrete, delay the appearance of a second exothermic peak, achieve a retarding effect, facilitate the temperature control of mass concrete and effectively avoid cracking after solidification.
In order to achieve the purpose, the invention adopts the following technical scheme:
the roller compacted concrete for the dam engineering of the hydropower station comprises the following raw materials in parts by mass: 66-70 parts of water, 43.4-55.3 parts of cement, 117.3-138.2 parts of fly ash, 707-788 parts of artificial sand, 0-540 parts of large broken stone, 774-885 parts of medium broken stone, 486-542 parts of small broken stone, 1.30-1.38 parts of water reducing agent and 0.24-0.26 part of air entraining agent.
And the Vc value of the roller compacted concrete is 3-5. Preferably, the Vc value of the roller compacted concrete is 3.7-4.8. Preferably, the fly ash is 129-130 parts.
Preferably, the sand rate of the artificial sand is 32-36%. Specifically, the sand rate of the artificial sand may be 32% or 33% or 34% or 36%, and so on.
Preferably, the fly ash content of the roller compacted concrete is 70-75%. Specifically, the blending amount of the fly ash is 70%, 72%, 75% and the like. In the present application, the blending amount of fly ash is defined as the mass ratio of fly ash to cement, that is: fly ash/(fly ash + cement).
Preferably, the water-cement ratio of the roller compacted concrete is 0.38-0.44.
In this application, the particle size of big rubble is 40 to 80 millimeters, the particle size of well rubble is 20 to 40 millimeters, the particle size of little rubble is 5 to 20 millimeters.
After the scheme is adopted, compared with the similar products, the scheme at least has the following advantages:
1. the roller compacted concrete prepared by the method has the advantages that the blending amount of the fly ash is up to 70-75%, and the blending amount exceeds the 65% of the standard requirement: the application passes through tests, inspection and special argumentation and is successfully applied, the cement amount used by the roller compacted concrete prepared by the application is relatively low, and the high-efficiency water reducing rate of the polycarboxylate superplasticizer is utilized, so that on the premise of meeting the design mechanical property, durability and construction performance requirements of the roller compacted concrete, the fly ash mixing amount is further increased, the cement amount and hydration heat temperature rise are reduced, the concrete adiabatic temperature rise is reduced from the source, the temperature control measures are simplified, the effect of 'bottom pot paying' is achieved, and the technical problem of traditional roller compacted concrete temperature control is effectively solved.
2. The price of fly ash is lower than that of cement, the cement amount used is relatively lower, the cost can be effectively reduced, the fly ash is increased, the cement amount is reduced, the cost is saved by about 8 yuan per cubic concrete on average, the dam needs about 100 ten thousand cubic roller compacted concrete in total, the total saving is 800 ten thousand yuan, and as the adiabatic temperature rise of the concrete is reduced from the source, the temperature control measures are simplified, and the direct benefit is achieved: the aggregate air cooling system equipment and the construction cost are saved by about 1000 ten thousand yuan, the operation cost of the air cooling system is saved by about 1500 ten thousand yuan, the cost is saved by about 2500 ten thousand yuan, and the two items are totally saved: 800 ten thousand yuan +2500 ten thousand yuan is 3300 ten thousand yuan.
3. According to the project, through technical innovation research, the mixing amount of the concrete in the fly ash is increased to 70% -75%, 23kg of fly ash is applied to each formula of the second-level mixed roller compacted concrete to replace 32.7kg of cement, 27kg of fly ash is applied to each formula of the third-level mixed roller compacted concrete to replace 26.4kg of cement, through technical popularization and application, the application amount of the fly ash in the roller compacted concrete engineering is increased, the recycling of fly ash waste of a thermal power plant is facilitated, the treatment cost of the fly ash is saved, meanwhile, the waste fly ash is recycled to obtain economic benefits, and the sustainable health development of enterprises is promoted. The carbon emission of the concrete is reduced by about 10 percent, and the environmental protection can be promoted.
4. The method is characterized in that a polycarboxylate water reducing agent is used, the water reducing rate reaches more than 30%, stone powder is highly doped, and the like, so that the roller compacted concrete suitable for dam needs is prepared, the roller compacted concrete is better in easiness (good cohesiveness, separation resistance and water retention property), low in VC value (1-5 s at an outlet), remarkably improved in plasticity retention property (the VC value retention rate is more than 75% after 2 h), longer in slow setting time (10-20 h in initial setting time), 3-4% in gas content, improved in mechanical property and durability, and reduced in cost. The dam is tested by water storage, the dam is safe and stable, the roller compacted concrete dam body has no water leakage phenomenon, the dam concrete has internal and external light, and the quality is good.
Detailed Description
The present invention is further described with reference to the following examples, but the present invention is not limited to the scope of the examples, and any modifications or changes that can be easily made by those skilled in the art without departing from the technical solution of the present invention will fall within the scope of the claims of the present invention. The corresponding units for each part by mass are identical, and 1 part by mass is used for 1 kg in the following example embodiment.
Example 1
The roller compacted concrete for hydropower station engineering is prepared from the following raw materials in parts by mass: 70 parts of water, 55.3 parts of cement, 129 parts of fly ash, 788 parts of artificial sand, 885 parts of medium crushed stone, 542 parts of small crushed stone, 1.38 parts of water reducing agent and 0.26 part of air entraining agent. The Vc value of the roller compacted concrete obtained by the formula is 3.7. The sand rate of the artificial sand in the formula is 36 percent. The fly ash content of the roller compacted concrete in the formula is 70%. The water-cement ratio of the roller compacted concrete in the formula is 0.38.
The preparation method of the roller compacted concrete comprises the following steps: the prepared raw materials are put into a cement mixer to be mixed.
Example 2
The roller compacted concrete for hydropower station engineering is prepared from the following raw materials in parts by mass: 70 parts of water, 46 parts of cement, 138.2 parts of fly ash, 788 parts of artificial sand, 885 parts of medium crushed stone, 542 parts of small crushed stone, 1.38 parts of water reducing agent and 0.26 part of air entraining agent. The Vc value of the roller compacted concrete obtained by the formula is 4. The sand rate of the artificial sand in the formula is 36 percent. The fly ash content of the roller compacted concrete in the formula is 75%. The water-cement ratio of the roller compacted concrete in the formula is 0.38.
The method of making the roller compacted concrete of this example was as in example 1.
Example 3
The roller compacted concrete for hydropower station engineering is prepared from the following raw materials in parts by mass: 70 parts of water, 36.8 parts of cement, 147.4 parts of fly ash, 788 parts of artificial sand, 885 parts of medium crushed stone, 542 parts of small crushed stone, 1.38 parts of water reducing agent and 0.26 part of air entraining agent. The Vc value of the roller compacted concrete obtained by the formula is 4.2. The sand rate of the artificial sand in the formula is 36 percent. The fly ash content of the roller compacted concrete in the formula is 80%. The water-cement ratio of the roller compacted concrete in the formula is 0.38.
The method of making the roller compacted concrete of this example was as in example 1.
Example 4
The roller compacted concrete for hydropower station engineering is prepared from the following raw materials in parts by mass: 72 parts of water, 54 parts of cement, 126 parts of fly ash, 788 parts of artificial sand, 885 parts of medium crushed stone, 542 parts of small crushed stone, 1.38 parts of water reducing agent and 0.26 part of air entraining agent. The Vc value of the roller compacted concrete obtained by the formula is 4.8. The sand rate of the artificial sand in the formula is 36 percent. The fly ash content of the roller compacted concrete in the formula is 70%. The water-cement ratio of the roller compacted concrete in the formula is 0.40.
The method of making the roller compacted concrete of this example was as in example 1.
Example 5
The roller compacted concrete for hydropower station engineering is prepared from the following raw materials in parts by mass: 72 parts of water, 45 parts of cement, 136 parts of fly ash, 788 parts of artificial sand, 885 parts of medium crushed stone, 542 parts of small crushed stone, 1.38 parts of water reducing agent and 0.26 part of air entraining agent. The Vc value of the roller compacted concrete obtained by the formula is 4.0. The sand rate of the artificial sand in the formula is 36 percent. The fly ash content of the roller compacted concrete in the formula is 75%. The water-cement ratio of the roller compacted concrete in the formula is 0.40.
The method of making the roller compacted concrete of this example was as in example 1.
Example 6
The roller compacted concrete for hydropower station engineering is prepared from the following raw materials in parts by mass: 72 parts of water, 36 parts of cement, 144 parts of fly ash, 788 parts of artificial sand, 885 parts of medium crushed stone, 542 parts of small crushed stone, 1.38 parts of water reducing agent and 0.26 part of air entraining agent. The Vc value of the roller compacted concrete obtained by the formula is 3.9. The sand rate of the artificial sand in the formula is 36 percent. The fly ash content of the roller compacted concrete in the formula is 80%. The water-cement ratio of the roller compacted concrete in the formula is 0.40.
The method of making the roller compacted concrete of this example was as in example 1.
Example 7
The roller compacted concrete for hydropower station engineering is prepared from the following raw materials in parts by mass: 66 parts of water, 52.1 parts of cement, 121.6 parts of fly ash, 707 parts of artificial sand, 540 parts of large crushed stone, 774 parts of medium crushed stone, 486 parts of small crushed stone, 1.30 parts of water reducing agent and 0.24 part of air entraining agent. The Vc value of the roller compacted concrete obtained by the formula is 4.5. The sand rate of the artificial sand in the formula is 32%. The fly ash content of the roller compacted concrete in the formula is 70%. The water-cement ratio of the roller compacted concrete in the formula is 0.38.
The method of making the roller compacted concrete of this example was as in example 1.
Example 8
The roller compacted concrete for hydropower station engineering is prepared from the following raw materials in parts by mass: 66 parts of water, 43.4 parts of cement, 130.0 parts of fly ash, 707 parts of artificial sand, 540 parts of large crushed stone, 774 parts of medium crushed stone, 486 parts of small crushed stone, 1.30 parts of water reducing agent and 0.24 part of air entraining agent. The Vc value of the roller compacted concrete obtained by the formula is 4.5. The sand rate of the artificial sand in the formula is 32%. The fly ash content of the roller compacted concrete in the formula is 75%. The water-cement ratio of the roller compacted concrete in the formula is 0.38.
The method of making the roller compacted concrete of this example was as in example 1.
Example 9
The roller compacted concrete for hydropower station engineering is prepared from the following raw materials in parts by mass: 66 parts of water, 34.7 parts of cement, 139 parts of fly ash, 707 parts of artificial sand, 540 parts of large crushed stone, 774 parts of medium crushed stone, 486 parts of small crushed stone, 1.30 parts of water reducing agent and 0.24 part of air entraining agent. The Vc value of the roller compacted concrete obtained by the formula is 4.6. The sand rate of the artificial sand in the formula is 32%. The fly ash content of the roller compacted concrete in the formula is 80%. The water-cement ratio of the roller compacted concrete in the formula is 0.38.
The method of making the roller compacted concrete of this example was as in example 1.
Example 10
The roller compacted concrete for hydropower station engineering is prepared from the following raw materials in parts by mass: 67 parts of water, 50.3 parts of cement, 117.3 parts of fly ash, 707 parts of artificial sand, 540 parts of large crushed stone, 774 parts of medium crushed stone, 486 parts of small crushed stone, 1.30 parts of water reducing agent and 0.24 part of air entraining agent. The Vc value of the roller compacted concrete obtained by the formula is 4.1. The sand rate of the artificial sand in the formula is 32%. The fly ash content of the roller compacted concrete in the formula is 70%. The water-cement ratio of the roller compacted concrete in the formula is 0.40.
The method of making the roller compacted concrete of this example was as in example 1.
Example 11
The roller compacted concrete for hydropower station engineering is prepared from the following raw materials in parts by mass: 67 parts of water, 41.9 parts of cement, 125.6 parts of fly ash, 707 parts of artificial sand, 540 parts of large crushed stone, 774 parts of medium crushed stone, 486 parts of small crushed stone, 1.30 parts of water reducing agent and 0.24 part of air entraining agent. The Vc value of the roller compacted concrete obtained by the formula is 4.4. The sand rate of the artificial sand in the formula is 32%. The fly ash content of the roller compacted concrete in the formula is 75%. The water-cement ratio of the roller compacted concrete in the formula is 0.40.
The method of making the roller compacted concrete of this example was as in example 1.
Example 12
The roller compacted concrete for hydropower station engineering is prepared from the following raw materials in parts by mass: 67 parts of water, 33.5 parts of cement, 134.0 parts of fly ash, 707 parts of artificial sand, 540 parts of large crushed stone, 774 parts of medium crushed stone, 486 parts of small crushed stone, 1.30 parts of water reducing agent and 0.24 part of air entraining agent. The Vc value of the roller compacted concrete obtained by the formula is 4.5. The sand rate of the artificial sand in the formula is 32%. The fly ash content of the roller compacted concrete in the formula is 80%. The water-cement ratio of the roller compacted concrete in the formula is 0.40.
The method of making the roller compacted concrete of this example was as in example 1.
Example 13
The roller compacted concrete for hydropower station engineering is prepared from the following raw materials in parts by mass: 68 parts of water, 45 parts of cement, 126 parts of fly ash, 720 parts of artificial sand, 86 parts of large crushed stone, 812 parts of medium crushed stone, 511 parts of small crushed stone, 1.33 parts of water reducing agent and 0.25 part of air entraining agent. The Vc value of the roller compacted concrete obtained by the formula is 4. The sand rate of the artificial sand in the formula is 33%. The fly ash content of the roller compacted concrete in the formula is 73.7%. The water-cement ratio of the roller compacted concrete in the formula is 0.39.
Example 14
The roller compacted concrete for hydropower station engineering is prepared from the following raw materials in parts by mass: 89 parts of water, 87 parts of cement, 106 parts of fly ash, 788 parts of artificial sand, 885 parts of medium crushed stone, 542 parts of small crushed stone, 1.38 parts of water reducing agent and 0.26 part of air entraining agent. The sand rate of the artificial sand in the formula is 38%. The Vc value of the roller compacted concrete obtained by the formula is 3.5. The fly ash content of the roller compacted concrete in the formula is 55%. The water-cement ratio of the roller compacted concrete in the formula is 0.46.
The method of making the roller compacted concrete of this example was as in example 1.
Comparative example 1 (original roller compacted concrete formulation 1)
The roller compacted concrete for hydropower station engineering is prepared from the following raw materials in parts by mass: 89 parts of water, 87 parts of cement, 106 parts of fly ash, 824 parts of artificial sand, 853 parts of medium crushed stone, 523 parts of small crushed stone, 1.548 parts of water reducing agent and 0.039 part of air entraining agent. The fly ash content of the roller compacted concrete in the formula is 55%. The water-cement ratio of the roller compacted concrete in the formula is 0.46.
The method of making the roller compacted concrete of this comparative example was as in example 1.
Comparative example 2 (original roller compacted concrete formulation 2)
The roller compacted concrete for hydropower station engineering is prepared from the following raw materials in parts by mass: 81 parts of water, 69 parts of cement, 103 parts of fly ash, 729 parts of artificial sand, 454 parts of large broken stone, 651 parts of medium broken stone, 409 parts of small broken stone, 1.379 parts of water reducing agent and 0.034 part of air entraining agent. The fly ash content of the roller compacted concrete in the formula is 60%. The water-cement ratio of the roller compacted concrete in the formula is 0.47.
The method of making the roller compacted concrete of this comparative example was as in example 1.
The materials used for the cements in examples 1 to 14 and comparative examples 1 to 2 were the "fort" brand p. L H42.5 cement manufactured by huaxin cement (kingdom, east china) limited, and the physical properties of the cements were examined as shown in table 1.
TABLE 1 Cement physical Properties test results
The hydration heat test results of cement are shown in Table 2 below
TABLE 2 hydration heat test results of cement
The fly ash uses the following materials: second-grade fly ash of Xuanwei power generation fly ash development Limited company; the results of the physical property measurements are shown in Table 3.
TABLE 3 fly ash physical Properties test results
The artificial sand is produced by a sand and stone system of a Yunnan Wanjiakou hydropower station engineering, and can be also produced in the market. The physical quality index test results are shown in Table 4.
TABLE 4 physical quality test results for artificial sands
The water reducing agent is prepared from the following materials: PCA polycarboxylic acid water reducing agent (retarding type) produced by Jiangsu Subo new materials GmbH; preparing into 40% solution for use;
the air entraining agent is prepared from the following materials: an GYQ type air entraining agent produced by Jiangsu Subo New Material Co., Ltd is prepared into a solution with a concentration of 5% for use.
The fly ash is one of important composition materials of the roller compacted concrete, the reasonable selection of the variety and the mixing amount of the fly ash not only has important influence on the workability and the physical and mechanical properties of the roller compacted concrete, but also is very favorable for improving the thermal property, the crack resistance and other properties of the roller compacted concrete by mixing the fly ash as much as possible under the same other conditions.
Evaluation of Effect
The compressive strength of the concrete obtained in each of the above examples is shown in the following table:
the test results of ultimate tensile value, axial tensile strength and freezing resistance of the roller compacted concrete in the embodiment are as follows:
it can be seen from the above table that when the amount of the coal ash is within the range of 70-75%, the compressive strength at 7 days is 7.8-10.6 MPa, and the compressive strength at 28 days is 13.5-16.1 MPa, and compared with the product with 60% of the amount of the coal ash, the difference of the compressive strengths is not great, and the compressive strength completely meets the compressive standard in dam construction, while when the amount of the coal ash is 80%, the compressive strength is relatively low as in examples 3, 6, 9 and 12, that is, within the range of the formula in the application, the compressive strength of the obtained product is good, and after the range of the compressive strength is exceeded, the compressive strength of the obtained product is relatively low.
It can also be seen that, when the amount of the coal ash is 80%, the compressive strength is relatively low as in examples 3, 6, 9 and 12, and the ultimate tensile values at 180 days in examples 3, 6, 9 and 12 are 86.5, 83.1, 87.0 and 86.6, respectively. While in other examples the performance at ultimate tensile values performed better.
It can also be seen that, when the amount of the coal ash is 80%, the compressive strength is relatively low as in examples 3, 6, 9 and 12, and the axial tensile strength values in examples 3, 6, 9 and 12 are 3.66, 3.27, 3.72 and 3.12, respectively. In other embodiments, the axial tensile strength performance is better.
The split tensile strength of the examples can also be seen, and when the amount of the coal ash is 80%, the split tensile strength is lower than that of the other examples.
In the examples, it can also be seen that when the amount of the fly ash is 80%, the mass loss rate of the antifreeze performance (180d) is also high. In other embodiments, however, the mass loss rate of the frost resistance (180d) is relatively low.
The hydration heat of example 1, example 8, comparative example 1, comparative example 2 was compared as follows:
the results of the adiabatic temperature rise tests for examples 1 and 8 are given in the following table:
as can be seen from the comparison in the above table, the hydration heat of the formulation of example 1 is at least 36.8% lower than that of the conventional formulation of comparative example 1, and the hydration heat of the formulation of example 8 is at least 36.2% lower than that of the conventional formulation of comparative example 2, so that the present application has good crack resistance. Moreover, the crack resistance has a time effect, and the crack resistance is gradually improved in the later period.
The experimental results show that the roller compacted concrete has excellent performances. The formulas of the above embodiments 1 and 8 are successfully applied to Wanjiakouzi hydropower station engineering in Xuanwei City of Yunnan province in 2017, and the formula of the embodiment 1 meets the design grade of C2 18025/W8/F100, which may be referred to herein as second-mix roller compacted concrete, the formulation of example 8 meets the design rating of C3 18025/W2/F50, which may be referred to herein as tertiary mix roller compacted concrete. In the project, the cost of increasing the fly ash to reduce cement consumption is saved by about 8 yuan per cubic concrete on average, approximately about 100 ten thousand cubic roller compacted concrete is needed totally, 800 ten thousand yuan is saved totally, because the adiabatic temperature rise of the concrete is reduced from the source, the temperature control measure is simplified, and the direct benefit is as follows: the aggregate air cooling system equipment and the construction cost are saved by about 1000 ten thousand yuan, the operation cost of the air cooling system is saved by about 1500 ten thousand yuan, the cost is saved by about 2500 ten thousand yuan, and the two items are totally saved: 800+2500 ═ 3300 ten thousand yuan. Through the research of technical innovation, the doping amount of the fly ash in the concrete is improved to 70-75 percent, 23kg of fly ash is applied to each formula of the second-level prepared roller compacted concrete to replace 32.7kg of cement, 27kg of fly ash is applied to each formula of the third-level prepared roller compacted concrete to replace 26.4kg of cement, and through the technical popularization and application, the application amount of the fly ash in the roller compacted concrete engineering is increasedThe method is beneficial to recycling the fly ash waste of the thermal power plant, saves the treatment cost of the fly ash, and simultaneously recycles the waste fly ash to obtain economic benefits and promote the sustainable and healthy development of enterprises. The carbon emission of the concrete is reduced by about 10 percent, and the environmental protection can be promoted.
Claims (6)
1. The roller compacted concrete for hydropower station engineering is characterized by comprising the following raw materials in parts by mass: 66-70 parts of water, 43.4-55.3 parts of cement, 117.3-138.2 parts of fly ash, 707-788 parts of artificial sand, 0-540 parts of large broken stone, 774-885 parts of medium broken stone, 486-542 parts of small broken stone, 1.30-1.38 parts of water reducing agent and 0.24-0.26 part of air entraining agent.
2. The roller compacted concrete for hydropower station engineering according to claim 1, wherein the Vc value of the roller compacted concrete is 3.7-4.8.
3. The roller compacted concrete for hydropower station engineering according to claim 1, wherein the sand rate of the artificial sand is 32-36%.
4. The roller compacted concrete for hydropower station engineering according to claim 1, wherein the blending amount of fly ash in the roller compacted concrete is 70-75%.
5. The roller compacted concrete for hydropower station engineering according to claim 1, wherein the water-to-cement ratio of the roller compacted concrete is 0.38-0.40.
6. The roller compacted concrete for hydropower station engineering according to claim 1, wherein the large crushed stone has a particle size of 40 to 80 mm, the medium crushed stone has a particle size of 20 to 40 mm, and the small crushed stone has a particle size of 5 to 20 mm.
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| CN112759315A (en) * | 2020-12-21 | 2021-05-07 | 中国水利水电第九工程局有限公司 | Construction method for dynamically controlling VC value of roller compacted concrete under complex weather condition |
| CN114671657A (en) * | 2022-04-25 | 2022-06-28 | 中国能源建设集团广西水电工程局有限公司 | Green high-performance roller compacted concrete and application thereof in extra-high arch dam |
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