CN111320442A - Concrete for power transmission line construction - Google Patents
Concrete for power transmission line construction Download PDFInfo
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- CN111320442A CN111320442A CN202010247413.5A CN202010247413A CN111320442A CN 111320442 A CN111320442 A CN 111320442A CN 202010247413 A CN202010247413 A CN 202010247413A CN 111320442 A CN111320442 A CN 111320442A
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- transmission line
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous 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
- 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
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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 discloses a concrete for power transmission line construction, which comprises the following components in parts by weight: 508-700 parts of sulphoaluminate cement; 1900-2100 parts of aggregate; 1-5 parts of an early strength component; 15-20 parts of a polycarboxylic acid type high-efficiency water reducing agent; 1-5 parts of modified polypropylene fiber; 250-300 parts of water. The concrete for the power transmission line construction provided by the invention has the advantages of strong early compressive capacity, short curing time, greatly shortened construction time and reduced construction cost.
Description
Technical Field
The invention relates to the technical field of transmission line materials, in particular to concrete for transmission line construction.
Background
At present, in order to solve the problems of low early strength and long curing time of cast-in-place concrete in the foundation construction process, people generally adopt a method of replacing ordinary strength portland cement concrete with high strength portland cement concrete or adding an early strength agent to improve the early strength while replacing the ordinary strength portland cement concrete with the high strength portland cement concrete. The high-strength portland cement concrete is used for replacing ordinary-strength portland cement concrete, so that the characteristic that the early strength of the high-strength concrete is higher than that of the ordinary-strength concrete is utilized, and the method has the defects that the later strength is too high, the strength of the high-strength concrete is not fully utilized, the structure stress is unreasonable and great waste is caused; the method of adding the early strength agent while replacing the common strength portland cement concrete with the high strength portland cement concrete has limited strength improvement due to the setting and hardening characteristics of the common strength portland cement, and the early strength effect is not obvious because the compressive strength of the common strength portland cement concrete is more than 30MPa for 3-7 days.
In the field of concrete for roads, the early strength of concrete is improved by replacing ordinary portland cement with special cement sulphoaluminate cement, because sulphoaluminate cement has quick hardening and early strength properties. For example, chinese patent publication No. CN102701684A discloses a method for preparing an ultra-early strength concrete material, which specifically comprises the following steps: mixing and fully stirring sulphoaluminate cement, broken stone, river sand, mineral powder, a solid early-strength component, a liquid early-strength component and tap water according to the weight ratio, wherein the weight ratio of each component is as follows: 100 parts of sulphoaluminate cement, 210-240 parts of sand, 260-290 parts of broken stone, 10-50 parts of mineral powder, 5-7 parts of solid early strength component, 6-9 parts of liquid early strength component and 45-50 parts of tap water. The curing time of the super early strength concrete material can be shortened to 6h at most, so that the concrete strength of a construction pavement can reach 30MPa, and the use requirement of a traffic pavement is met. The sulphoaluminate cement is used for replacing common silicate cement to prepare the concrete, and because the sulphoaluminate cement is too fast to hydrate, is easy to flash set and is dry-shrinkage cracked, the later strength and the durability are poor; the sulphoaluminate cement is doped with the composite early strength agent, so that the composite early strength agent has the defects of complex preparation, special preparation, difficult construction operation, large water-cement requirement and high fluidity of a pavement process, and is not suitable for basic construction of a power transmission line.
Disclosure of Invention
In view of the above, it is necessary to provide a concrete for power transmission line construction having high early strength and short curing time to solve the above problems.
The invention provides a concrete for power transmission line construction, which comprises the following components in parts by weight:
508-700 parts of sulphoaluminate cement;
1900-2100 parts of aggregate;
1-5 parts of an early strength component;
15-20 parts of a polycarboxylic acid type high-efficiency water reducing agent;
1-5 parts of modified polypropylene fiber;
250-300 parts of water.
Preferably, the aggregate comprises stones and sand, the sand rate of the aggregate is 28-34%, the particle size of the stones is 5-15 mm, the particle size of the sand is 1-5 mm, and the fineness modulus is 2.3-3.0.
Preferably, the modified polypropylene fiber is cylindrical in shape and has the fiber fineness of 0.5-20 denier.
Preferably, the surface of the modified polypropylene fiber is treated by a composite surface modifier.
Preferably, the surface modifier is obtained by melt mixing polypropylene, a composite interface modifier and polypropylene grafted maleic anhydride, and then spinning, winding and hot drawing.
Preferably, the water reducing rate of the polycarboxylic acid type high-efficiency water reducing agent is 10 to 18 percent
Preferably, the composite interphase modifier includes SiO2, Al2O3, and CaO.
Compared with the prior art, the concrete for power transmission line construction provided by the invention has the following beneficial effects:
the concrete for the power transmission line construction provided by the invention has the advantages of strong early compressive capacity, short curing time, greatly shortened construction time and reduced construction cost.
1. The early strength concrete provided by the invention is prepared from the sulphoaluminate cement, so that the defect that the strength of ordinary portland cement reaches 70% and needs about 3-7 days is overcome.
2. The early strength concrete of the invention is beneficial to the early strength and the later strength of the concrete by using the early strength agent triethanolamine and the early strength component, the 30MPa compressive strength is only 0.5 day, and the early strength concrete is about 4 to 6 days earlier than the common portland cement concrete, so that the rapid construction of a cast-in-place concrete structure is facilitated, and the construction speed is greatly improved.
Detailed Description
The present invention will be further described with reference to the following examples. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a concrete for power transmission line construction, and mainly aims to solve the problems of low early strength and long maintenance time of cast-in-place concrete of a power transmission line in the process of foundation construction. The concrete for the construction of the power transmission line comprises the following components in parts by weight:
508-700 parts of sulphoaluminate cement;
1900-2100 parts of aggregate;
1-5 parts of an early strength component;
15-20 parts of a polycarboxylic acid type high-efficiency water reducing agent;
1-5 parts of modified polypropylene fiber;
250-300 parts of water.
The aggregate comprises stones and sand, the sand rate of the aggregate is 28-34%, the particle size of the stones is 5-15 mm, the particle size of the sand is 1-5 mm, and the fineness modulus is 2.3-3.0. By adopting the aggregate with smaller grain diameter and the aggregate and the early strength component to act together, the concrete with stronger compressive strength can be obtained.
The water reducing rate of the polycarboxylic acid high-efficiency water reducing agent is 10-18%, and the water content in concrete is reduced. The modified polypropylene fiber is cylindrical, and the fiber fineness is 0.5-20 denier; the surface of the modified polypropylene fiber is treated by a composite surface modifier. Specific modification procedures are described below.
In the concrete, the early strength component is added to the concrete for power transmission line construction, so that the early strength is increased, and further, the modified polypropylene fiber is used for reinforcement in the application, so that the maintenance time is shortened.
Example 1
In this embodiment, the concrete for power transmission line construction comprises the following components in parts by mass: 508 parts of sulphoaluminate cement, 1900 parts of aggregate, 1 part of early strength component, 15 parts of polycarboxylic acid high-efficiency water reducing agent, 1 part of modified polypropylene fiber and 250 parts of water.
Example 2
In this embodiment, the concrete for power transmission line construction comprises the following components in parts by mass: 700 parts of sulphoaluminate cement, 2100 parts of aggregate, 5 parts of early strength component, 20 parts of polycarboxylic acid high-efficiency water reducing agent, 5 parts of modified polypropylene fiber and 300 parts of water.
Example 3
In this embodiment, the concrete for power transmission line construction comprises the following components in parts by mass: 550 parts of sulphoaluminate cement, 1950 parts of aggregate, 2 parts of early strength component, 16 parts of polycarboxylic acid high-efficiency water reducing agent, 2 parts of modified polypropylene fiber and 260 parts of water.
Example 4
In this embodiment, the concrete for power transmission line construction comprises the following components in parts by mass: 600 parts of sulphoaluminate cement, 2000 parts of aggregate, 3 parts of early strength component, 17 parts of polycarboxylic acid high-efficiency water reducing agent, 3 parts of modified polypropylene fiber and 280 parts of water.
Example 5
In this embodiment, the concrete for power transmission line construction comprises the following components in parts by mass: 650 parts of sulphoaluminate cement, 2050 parts of aggregate, 4 parts of early strength component, 19 parts of polycarboxylic high-efficiency water reducing agent, 4 parts of modified polypropylene fiber and 290 parts of water.
Comparative example 1
In this embodiment, the concrete for power transmission line construction comprises the following components in parts by mass: 600 parts of sulphoaluminate cement, 2000 parts of aggregate, 17 parts of polycarboxylic acid high-efficiency water reducing agent, 3 parts of modified polypropylene fiber and 280 parts of water.
Comparative example 2
In this embodiment, the concrete for power transmission line construction comprises the following components in parts by mass: 600 parts of sulphoaluminate cement, 2000 parts of aggregate, 3 parts of early strength component, 17 parts of polycarboxylic acid high-efficiency water reducing agent and 280 parts of water.
The early strength component comprises sodium sulfate, calcium chloride, sodium chloride, calcium nitrate, calcium nitrite, triethanolamine and the like according to different use conditions, and in each embodiment, the early strength component is used.
Concrete for power transmission line construction obtained by the components of the above embodiments is tested for early strength and curing time, and the concrete results are as follows, the early strength in embodiment 1 is 30d compressive strength, and the curing time is 2 days; the early strength in example 2 is compressive strength of 30d, and the curing time is 2 days; the early strength in example 3 was 31d compressive strength, and the curing time was 0.8 day; the early strength in example 4 was 32d compressive strength, and the curing time was 0.5 day; the early strength in example 5 was 31d compressive strength, and the curing time was 0.7 day.
In comparative example 1, the early strength was compressive strength of 8d, and the curing time was 7 days; in comparative example 2, the early strength was 20d compressive strength and the curing time was 5 days.
According to the concrete for power transmission line construction in each embodiment, it can be seen that the early strength of the concrete for power transmission line construction can be greatly improved due to the adoption of the early strength component and the use of the early strength component with proper content; furthermore, the modified polypropylene fiber is adopted in the invention, has good hydrophilicity and good dispersion performance in mortar concrete, and enhances the interface performance of the fiber and a cement matrix, thereby greatly shortening the curing time.
The application also provides a method for preparing the concrete for the power transmission line construction, which comprises the following steps:
(1) and uniformly stirring the sulphoaluminate cement, the aggregate and the early strength component to obtain a first mixture.
And stirring the components of the sulphoaluminate cement, the aggregate and the early strength component according to the proportion for 2-5 min to obtain a first mixture for later use.
(2) And uniformly stirring the water, the triethanolamine, the modified polypropylene fiber and the polycarboxylic high-efficiency water reducing agent to obtain a second mixture.
And uniformly stirring the water, the triethanolamine, the modified polypropylene fibers and the polycarboxylic high-efficiency water reducing agent for 20-30 s to obtain a second mixture.
The modified polypropylene fiber is modified by a composite interface modifier, and is obtained by processing the modified polypropylene fiber by the composite surface modifier, wherein the processing comprises melting and mixing polypropylene, the composite interface modifier and polypropylene grafted maleic anhydride, spinning, winding and hot drawing. The interface modifier comprises SiO2, Al2O3 and CaO. SiO2, Al2O3 and CaO in the composite interface modifier enhance the roughness of the fiber surface, so that the physical action of the fiber and the matrix is enhanced, and the interface bonding force of the fiber and the matrix is enhanced; CaO reacts with water in the mortar concrete to generate hydration products, and the interface performance of the fibers and the cement matrix is enhanced; SiO2 and Al2O3 in the composite interface modifier coexist, so that a mullite phase is easily generated, and the high-temperature strength and the thermal vibration resistance of the fiber are improved.
Further, the composite interface modifier comprises the following components in percentage by mass: 280% of SiO, 30.5% of Al2O30% and 19.5% of CaO. The content components of the composite interface modifier are adjusted by adopting more SiO2 and CaO so as to reduce the cost of the composite interface modifier. The high content of CaO enhances the early strength of the concrete, and further, the low content of Al2O3 is adopted to generate less mullite phases, so that the influence of thermal vibration performance is reduced, and the curing time of the concrete is further reduced.
Furthermore, triethanolamine (molecular formula C6H15NO3) is selected as an early strength agent, an unshared electron pair on an N atom of the triethanolamine is easy to form a covalent bond with metal ions to generate a complex reaction, the generated complex is easy to dissolve in water, and a soluble region point is generated on the surface of cement particles, so that the dissolution rate of C3F and C4AF in cement is increased, the reaction with gypsum is accelerated, the generation amount of calcium sulfoaluminate is increased, and the compactness and the early strength of hardened cement stone are greatly improved. Due to the generation of the complex, the supersaturation degree of Ca (OH)2 in the liquid phase is improved, the tendency of forming a loose crystalline structure at the initial stage of hydration of C3A is more effectively prevented, the compactness and the strength of the set cement are improved, and the curing time for the concrete to reach the construction strength is further shortened.
Furthermore, the water reducing agent is selected from a polycarboxylic acid high-efficiency water reducing agent, hydrophobic groups of the water reducing agent are directionally adsorbed on the surfaces of cement particles, hydrophilic groups of the water reducing agent are directed to an aqueous solution to form a monomolecular or polymolecular adsorption film, and the directional adsorption of a surfactant can enable the surfaces of cement colloidal particles to have charges with the same sign, so that under the action of like-polarity repulsion, a cement-water system can be in a relatively stable suspension state, and a flocculation-shaped structure formed at the initial stage of water addition of cement can be dispersed and disintegrated, so that water in the flocculation structure is released, and the purpose of water reduction is achieved. After the polycarboxylic acid high-efficiency water reducing agent is added, the workability of the fresh concrete can be improved, the water-cement ratio in the concrete is greatly reduced, the internal pore volume of the set cement is obviously reduced, the set cement is more compact, the compressive strength of the concrete is obviously improved, and the obtained concrete has the advantages of short curing time and high early strength.
(3) And adding the second mixture into the first mixture, and uniformly stirring to obtain the concrete.
And adding the second mixture into the first mixture, and uniformly stirring for 2-5 min.
According to the concrete for power transmission line construction and the preparation method thereof, provided by the invention, the concrete is strong in early compressive capacity and short in curing time, the construction time is greatly shortened, and the construction cost is reduced. Furthermore, the preparation method provided by the invention is simple in operation method, low in requirement on operation conditions and convenient for realizing industrialization.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (7)
1. The utility model provides a concrete is used in transmission line construction which characterized in that: the concrete comprises the following components in parts by weight:
508-700 parts of sulphoaluminate cement;
1900-2100 parts of aggregate;
1-5 parts of an early strength component;
15-20 parts of a polycarboxylic acid type high-efficiency water reducing agent;
1-5 parts of modified polypropylene fiber;
250-300 parts of water.
2. The concrete for power transmission line construction according to claim 1, characterized in that:
the aggregate comprises stones and sand, the sand rate of the aggregate is 28-34%, the particle size of the stones is 5-15 mm, the particle size of the sand is 1-5 mm, and the fineness modulus is 2.3-3.0.
3. The concrete for power transmission line construction according to claim 1 or 2, wherein the modified polypropylene fiber has a cylindrical shape and a fiber fineness of 0.5 to 20 denier.
4. The concrete for power transmission line construction according to claim 1, wherein the surface of the modified polypropylene fiber is treated by a composite surface modifier.
5. The concrete for power transmission line construction according to claim 4, wherein the treatment by the composite surface modifier comprises melt mixing of polypropylene, a composite interface modifier and polypropylene-grafted maleic anhydride, and then spinning, winding and hot drawing.
6. The concrete for power transmission line construction according to claim 1,
the water reducing rate of the polycarboxylic acid high-efficiency water reducing agent is 10-18%.
7. The concrete for power transmission line construction according to claim 5,
the composite interface modifier comprises SiO2, Al2O3 and CaO.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010247413.5A CN111320442A (en) | 2020-03-31 | 2020-03-31 | Concrete for power transmission line construction |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010247413.5A CN111320442A (en) | 2020-03-31 | 2020-03-31 | Concrete for power transmission line construction |
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| CN111320442A true CN111320442A (en) | 2020-06-23 |
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| CN202010247413.5A Pending CN111320442A (en) | 2020-03-31 | 2020-03-31 | Concrete for power transmission line construction |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105924110A (en) * | 2016-04-26 | 2016-09-07 | 国家电网公司 | Early strength concrete for power transmission line foundation construction, and preparation method thereof |
| CN107099869A (en) * | 2017-06-16 | 2017-08-29 | 中山科成化纤有限公司 | A kind of modified polypropylene fiber and preparation method thereof and modified polypropylene fiber reinforced mortar concrete |
| CN107207345A (en) * | 2014-12-17 | 2017-09-26 | 埃泰克斯服务股份有限公司 | Improved polypropylene fibre, the method for manufacturing the fiber and its purposes for being used to produce fiber cement products |
| CN107324736A (en) * | 2017-07-20 | 2017-11-07 | 合肥安力电力工程有限公司 | A kind of power circuit installation early strength concrete and preparation method thereof |
| CN109020373A (en) * | 2018-08-22 | 2018-12-18 | 铭际建筑科技(上海)有限公司 | Early strong rapid-hardening concrete and preparation method thereof |
-
2020
- 2020-03-31 CN CN202010247413.5A patent/CN111320442A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107207345A (en) * | 2014-12-17 | 2017-09-26 | 埃泰克斯服务股份有限公司 | Improved polypropylene fibre, the method for manufacturing the fiber and its purposes for being used to produce fiber cement products |
| CN105924110A (en) * | 2016-04-26 | 2016-09-07 | 国家电网公司 | Early strength concrete for power transmission line foundation construction, and preparation method thereof |
| CN107099869A (en) * | 2017-06-16 | 2017-08-29 | 中山科成化纤有限公司 | A kind of modified polypropylene fiber and preparation method thereof and modified polypropylene fiber reinforced mortar concrete |
| CN107324736A (en) * | 2017-07-20 | 2017-11-07 | 合肥安力电力工程有限公司 | A kind of power circuit installation early strength concrete and preparation method thereof |
| CN109020373A (en) * | 2018-08-22 | 2018-12-18 | 铭际建筑科技(上海)有限公司 | Early strong rapid-hardening concrete and preparation method thereof |
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Application publication date: 20200623 |