CN115010435A - Concrete, construction method and landfill leachate treatment system - Google Patents
Concrete, construction method and landfill leachate treatment system Download PDFInfo
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- CN115010435A CN115010435A CN202210735662.8A CN202210735662A CN115010435A CN 115010435 A CN115010435 A CN 115010435A CN 202210735662 A CN202210735662 A CN 202210735662A CN 115010435 A CN115010435 A CN 115010435A
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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
- C04B28/04—Portland cements
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
- E04G21/06—Solidifying concrete, e.g. by application of vacuum before hardening
- E04G21/08—Internal vibrators, e.g. needle vibrators
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/34—Non-shrinking or non-cracking materials
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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
Abstract
The invention provides concrete, a construction method and a landfill leachate treatment system, which comprise the following components: in each cubic meter of concrete, the cement accounts for 380kg, the sand accounts for 550 ℃ for 700 kg, the broken stone accounts for 850 ℃ for 1100kg, the fly ash accounts for 60-92kg, the mineral powder accounts for 93-115kg, the admixture accounts for 5.2-8.3kg, the anti-corrosion and anti-corrosion agent accounts for 20-40kg, the expansion fiber anti-cracking and water-proofing agent accounts for 22-38kg, the anti-cracking fiber accounts for 0.55-1.2kg and the water accounts for 150 ℃ for 175 kg. After the corrosion-resistant anti-cracking waterproof agent, the fiber-reinforced high-performance expansion anti-cracking agent and the polypropylene anti-cracking fibers are doped, the fibers are uniformly distributed in the concrete, a large number of fibers which are adhered to each other in the concrete play a role of supporting aggregate, a uniform supporting system is formed in the concrete, and the generation and development of micro cracks and communicated cracks are inhibited.
Description
Technical Field
The invention relates to the technical field of constructional engineering, in particular to concrete, a construction method and a landfill leachate treatment system.
Background
At present, landfill leachate generated in the process of waste incineration power generation is recognized as high-risk and high-pollution wastewater, and has great potential hazard on underground water and surface water. At present, the requirement of seepage of percolate cannot be met only by depending on the self-waterproofing of concrete, and the requirement of the impermeability of the concrete must be improved by some additives.
Disclosure of Invention
In view of the above, the invention provides concrete, a construction method and a landfill leachate treatment system, and aims to solve the problem that landfill leachate generated in the existing waste incineration power generation process is difficult to treat, so that adverse effects are brought to the environment.
The invention provides concrete which comprises the following components: cement 300-380kg/m 3 Sand 550-700 kg/m 3 850- 3 60-92kg/m of fly ash 3 93-115kg/m of mineral powder 3 5.2-8.3kg/m of additive 3 20-40kg/m of anti-corrosion preservative 3 22-38kg/m of anti-cracking waterproof agent for expansion fiber 3 0.55-1.2kg/m of anti-crack fiber 3 150-175kg/m water 3 。
Further, in the concrete, the concrete comprises the following components: cement 328kg/m 3 645kg/m of sand 3 1020kg/m of crushed stone 3 84kg/m of fly ash 3 110kg/m of mineral powder 3 7.83kg/m of admixture 3 35kg/m of anti-corrosion agent 3 35kg/m of expansion fiber anti-cracking waterproof agent 3 1kg/m of anti-crack fiber 3 167kg/m of water 3 。
Further, in the concrete, the cement is P · O42.5 portland cement; the particle size of the sand is 0.25-0.5 mm, and the mud content is less than or equal to 3%; the particle size of the gravel is 5-40 mm.
Further, in the above concrete, the admixture comprises: water reducing agent and pumping agent; wherein the weight ratio of the water reducing agent to the pumping agent is 1: 1.5.
Further, in the concrete, the fly ash is grade II, the fineness is less than 25%, the loss on ignition is less than 8%, and the water demand ratio is less than 105%.
Further, in the concrete, the anti-corrosion preservative is a SY-KS multifunctional anti-corrosion preservative; and/or the expansion fiber anti-cracking waterproof agent is a SY-K expansion fiber anti-cracking waterproof agent.
Further, in the concrete, the anti-crack fiber is at least one selected from the group consisting of steel fiber and polypropylene anti-crack fiber.
On the other hand, the invention also provides a concrete construction method, which comprises the following steps:
stirring: sequentially adding sand, cement, fly ash, mineral powder anti-corrosion preservative, expansive fiber anti-cracking waterproof agent, polypropylene anti-cracking fiber and additive into a stirrer, mixing for a first preset time, then adding mixing water, mixing for a second preset time, and finally adding broken stone, mixing for a third preset time to obtain concrete;
a transportation step, namely transporting the concrete obtained in the step to a platform pouring place, and then distributing the concrete to meet the requirements of continuous pouring and one-step forming of the beam concrete;
pouring and vibrating, namely pouring the concrete in a slope layered manner to build the garbage pool, vibrating the concrete of the wall body of the garbage pool by using an internal vibrator, and quickly inserting and slowly pulling the vibrating rod of the internal vibrator vertically downwards when the internal vibrator is used;
and curing, namely performing heat preservation curing on the concrete enclosed belt mold for 14 days.
Further, in the above construction method, in the stirring step, a total duration of the first preset duration, the second preset duration and the third preset duration is less than or equal to 130 s.
Further, in the construction method, in the transporting step, the retention time of the concrete is less than or equal to 45min, the slump loss is less than or equal to 10%, and the total pouring time is less than or equal to 6 hours.
In another aspect, the present invention further provides a landfill leachate treatment system, including: a percolate collecting well and a garbage pool built by adopting the concrete in any one of the above steps; wherein the content of the first and second substances,
the garbage pool is communicated with the collecting well, and a cement-based permeable crystallization coating film layer and a waterproof roll material layer are sequentially paved on the inner side and the outer side of the garbage pool from inside to outside; a high-molecular coating anticorrosive layer is laid outside the cement-based permeable crystallization coating layer positioned on the inner wall of the garbage pool; the inner wall of the percolate collecting well is built by adopting glass fiber reinforced plastics.
After the concrete is doped with the corrosion-resistant anti-cracking waterproofing agent, the fiber-reinforced high-performance expansion anti-cracking agent and the polypropylene anti-cracking fibers, the fibers are uniformly distributed in the concrete, a large number of fibers which are adhered to each other in the concrete play a role of supporting aggregate, a uniform supporting system is formed in the concrete, and the generation and development of micro cracks and communicated cracks are inhibited. Meanwhile, the addition of a large number of fiber monofilaments can effectively prevent the segregation of aggregates and ensure the early uniform bleeding of concrete, thereby preventing the formation of settlement cracks.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below. While exemplary embodiments of the present disclosure have been shown, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail with reference to examples.
The invention provides concrete which comprises the following components: cement 300-380kg/m 3 Sand 550-700 kg/m 3 850- 3 60-92kg/m of fly ash 3 93-115kg/m of mineral powder 3 5.2-8.3kg/m of additive 3 20-40kg/m of anti-corrosion preservative 3 22-38kg/m of anti-cracking waterproof agent for expansion fiber 3 0.55-1.2kg/m of anti-crack fiber 3 150-175kg/m water 3 。
Preferably, the concrete comprises the following components: cement 328kg/m 3 645kg/m of sand 3 1020kg/m of crushed stone 3 84kg/m of fly ash 3 110kg/m of mineral powder 3 7.83kg/m of admixture 3 35kg/m of anti-corrosion agent 3 35kg/m of expansion fiber anti-cracking waterproof agent 3 1kg/m of anti-crack fiber 3 167kg/m of water 3 。
The cement is P.O 42.5 Portland cement. The cement in this example is portland cement produced by anhui scene cement limited.
The admixture comprises: water reducing agent and pumping agent; the weight ratio of the water reducing agent to the pumping agent is 1:1.5, and in practice, the water reducing agent accounts for 1% of the mass of the cement, and the pumping agent accounts for 1.5% of the mass of the cement.
Preferably, the water reducing agent is S95 polycarboxylic acid high-performance water reducing agent, and the pumping agent is polycarboxylic acid pumping agent.
The sand is medium sand with the grain size of 0.25-0.5 mm and the mud content is less than or equal to 3 percent, and is common river sand; preferably, the particle size of the sand is 0.25-3 mm; the broken stone is secondary graded broken stone, and the particle size of the broken stone is 5-40mm, preferably 5-25 mm.
The fly ash is II grade, the fineness is less than 25%, the loss on ignition is less than 8%, and the water demand ratio is less than 105%. In the embodiment, the fly ash is added in a certain proportion, so that the cement particles are physically dispersed and are distributed more uniformly. When the cement content of the concrete is lower, the slowly hydrated fly ash can provide water, so that the cement is more fully hydrated; the fly ash delays the hydration speed, reduces the temperature rise of the concrete caused by hydration heat, and is very favorable for preventing the concrete from generating temperature cracks. The voids of aggregate particles are filled and wrapped to form a lubricating layer, and the volume weight (apparent density) of the fly ash is only about 2/3 of cement, and the particle shape is good (the fly ash with good quality contains a large amount of glass beads), so that the fly ash can be filled more compactly and is particularly remarkable in concrete with less cement consumption; the fly ash and calcium hydroxide crystals enriched around the aggregate particles are subjected to a pozzolan reaction, so that a product with a gelling property (the same as a hydration product of silicate in cement) is generated, a weak transition region is reinforced, and the concrete has a remarkable effect of improving various performances of the concrete. The aggregate particles in this embodiment refer to sand and crushed stone.
The anti-corrosion preservative may be selected from SRA series concrete preservatives or SY-KS multifunctional anti-corrosion preservatives. Preferably a SY-KS multifunctional anti-corrosion preservative.
The anti-cracking waterproof agent for the expanded fibers is a SY-K anti-cracking waterproof agent for the expanded fibers.
The anti-crack fibers are preferably polypropylene anti-crack fibers, and are more preferably PH-A modified polypropylene anti-crack fibers.
The grade of the ore powder can be S75, S95, S105 or S115 grade. In this example, the fine slag powder of grade S95 from shanghai bao new building materials co. The mineral powder used as the admixture of the concrete can improve or enhance the comprehensive performance of the concrete, and the action mechanism is that the mineral powder has the micro-aggregate effect, the micro-crystal nucleus effect and the volcanic ash effect in the concrete, and can also enhance the impermeability of the concrete, reduce the hydration heat and prevent the temperature crack.
By adopting the formula in the embodiment of the invention, the minimum cement consumption in the prepared concrete is only 280 kg/m 3 In order to ensure the strength of concrete and reduce the consumption of cement, the maximum water-cement ratio in the embodiment is 0.35-0.45, the maximum chloride ion content is only 0.10%, and the corrosion to reinforcing steel bars can be effectively avoided. Mineral powder and fly ash are blended to replace part of cement, and a retarding water reducing agent is properly added, so that the water-cement ratio is reduced, the cement using amount is reduced, and the cement has proper workability and pumpability. When the concrete implementation is carried out, the water-cement ratio is firstly set, the cement consumption without admixture is calculated according to the original water consumption, then the admixture is considered according to the actual quality conditions of the fly ash and the mineral powder, a part of cement can be equivalently replaced, and the cement can be generally replaced according to different mixing ratios40-70 kg of S95-grade mineral powder is adopted for each cubic meter of concrete to replace the cement dosage, 2-grade fly ash can replace part of cement in excess, the excess is 1.4 times of the cement dosage, and 80-100 kg of fly ash is adopted for each cubic meter of concrete to replace the cement.
It can be clearly seen from the above description that, after the concrete provided in this embodiment is doped with the corrosion-resistant anti-cracking waterproofing agent, the fiber-reinforced high-performance expansion anti-cracking agent and the polypropylene anti-cracking fibers, the fibers are uniformly distributed in the concrete, and a large number of fibers adhered to each other in the concrete play a role of "supporting" aggregate, so as to form a uniform supporting system inside the concrete, thereby inhibiting the generation and development of micro cracks and connected cracks. Meanwhile, the addition of a large number of fiber monofilaments can effectively prevent the segregation of aggregates and ensure the early uniform bleeding of concrete, thereby preventing the formation of settlement cracks.
The invention also provides a landfill leachate treatment system, which comprises: the garbage pool and the percolate collecting pool are communicated; the garbage pool is built by adopting the concrete, and a cement-based permeable crystallization coating layer and a waterproof coil material layer are sequentially paved on the inner side and the outer side of the garbage pool from inside to outside; a high-molecular coating anticorrosive layer is laid outside the cement-based permeable crystallization coating layer positioned on the inner wall of the garbage pool; the inner wall of the percolate collecting well is made of glass fiber reinforced plastics. The garbage pool and the leachate maintenance channel share one wall body, the leachate collection well is located below the leachate maintenance channel, a plurality of rainwater grate holes are formed in the shared wall body, leachate in the garbage pool flows into the leachate maintenance channel through the reserved rainwater grate holes and is discharged into the leachate collection well through a water collecting ditch in the leachate maintenance channel.
The laying thickness of the cement-based permeable crystallization coating layer in the treatment system is 200 micrometers/square; the selected cement-based capillary crystalline waterproof coating is 401 Peng interior transmission in America; the waterproof coiled material layer adopts an SBS modified asphalt waterproof coiled material with the thickness of 3 mm; the high-molecular coating anticorrosive layer adopts high-wear-resistance epoxy glass flakes, and the laying thickness of the high-molecular coating anticorrosive layer is 200 micrometers/square.
It can be seen that: this landfill leachate processing system is through using foretell concrete to form inside seepage prevention structure, and further lay cement base infiltration crystallization coating film layer and waterproof roll material layer on interior lateral wall in proper order, has further strengthened the antiseep effect.
The invention also provides a concrete construction method, which comprises the following steps:
stirring: sequentially adding sand, cement, fly ash, mineral powder, an anti-erosion preservative, an expansion fiber anti-cracking waterproof agent, a polypropylene anti-cracking fiber and an additive into a stirrer, mixing for a first preset time, then adding mixing water, mixing for a second preset time, and finally adding broken stone, and mixing for a third preset time to obtain the concrete. In the step, a two-feeding method is adopted, the anti-cracking fibers and the preservative are dispersed into fiber monofilaments under the action of water soaking and the friction force of a stirrer, so that the anti-cracking and anti-permeability of the concrete are improved. The concrete prepared by adopting the anti-corrosion preservative, the expansion fiber anti-cracking waterproof agent and the polypropylene anti-cracking fiber has the advantages that the secondary strength can be improved by about 15 percent, and the cement can be saved by about 15 to 20 percent.
Specifically, the first preset time period can be 20-40s, and is preferably 30 s; the second preset time period can be 28-42s, and is preferably 40 s; the third predetermined period of time may be 45-65s, preferably 60 s. The total duration of the first preset duration, the second preset duration and the third preset duration is less than or equal to 130 s. The particle size of the crushed stone is preferably 5-40 mm.
And a transportation step, namely transporting the concrete obtained in the step to a platform pouring place, and then distributing the concrete to meet the requirements of continuous pouring and one-step forming of the beam concrete.
Specifically, before concrete is poured, sundries on a transportation road are cleaned, and the road smoothness in the concrete transportation process is ensured.
In specific implementation, 8 concrete conveying machines are used for conveying concrete to a platform position pouring place; the concrete is conveyed by two concrete automobile pumps, and the concrete is distributed by 2 concrete automobile pumps so as to meet the requirements of continuous pouring and one-step forming of beam concrete, the retention time (initial setting time of the concrete) is less than or equal to 45min, the slump loss is less than or equal to 10%, the total pouring time is not more than 6 hours, and the longest time is not more than the initial setting time of the concrete. The platform casting site refers to a pump station site of a concrete site. In the embodiment, the transportation time of the concrete is controlled within 45min, and the plasticity of the concrete is greatly reduced after the transportation time is over the time period.
Pouring and vibrating, namely pouring the concrete in a slope layered manner to build the garbage pool, vibrating the concrete of the wall body of the garbage pool by using an internal vibrator, and quickly inserting and slowly pulling the vibrating rod of the internal vibrator vertically downwards when the internal vibrator is used.
Particularly, for avoiding pouring in-process concrete to produce the segregation, guarantee that the concrete is freely emptyd highly within 2m, adopt a cluster section of thick bamboo to carry out the pouring concrete. The 'inclined plane layered pouring' method is selected during concrete pouring, the self fluidity of the concrete is utilized to form a slope, the pumping process is well adapted, the pumping efficiency is improved, the concrete bleeding treatment is simplified, and the upper and lower concretes are ensured not to exceed the initial setting time. The layered height is measured by a ruler rod, and the pouring thickness of each layer of the inclined plane is 300-400 mm.
The wall concrete is vibrated by the internal vibrator, the vibrating rod of the internal vibrator is vertically arranged when the wall concrete is used, the fast-inserting and slow-pulling are carried out, the vibrating time of each inserting point is 20-30 s, and the wall concrete is generally vibrated until cement paste does not sink obviously on the surface of the concrete and overflows on the surface.
And curing, namely performing heat preservation curing on the concrete enclosed belt mold for 14 days.
Specifically, the purpose of sealing the concrete is to enable the poured concrete to be automatically solidified and hardened in a closed space by a small temperature difference without being directly exposed to the atmosphere, so that the concrete admixture can fully play a role, and the waterproof, anticorrosion and anti-permeability performance of the concrete is improved.
In the garbage pool built by the method of the embodiment, the mixing amount of the corrosion-resistant and anti-cracking waterproof agent (SY-KS multifunctional anti-corrosion preservative) is 10% by weight of the preservative in each cubic of cement, and about 35kg of the preservative is added in each cubic of concrete; the weight proportion of the preservative in each cubic of cement in the post-cast strip is 12 percent. The mixing amount of the fiber-reinforced high-performance expansion crack-resistant agent (SY-K expansion fiber crack-resistant waterproof agent) is 10 percent by weight in each cubic piece of cement, the weight ratio of the expansion fiber crack-resistant waterproof agent in each cubic piece of cement in the post-cast strip is 12 percent, and about 35 kilograms of expansion fiber crack-resistant waterproof agent is added in each cubic piece of concrete.
The concrete provided by the present invention is described in detail below in several specific examples.
Example 1
And sequentially adding sand, cement, fly ash, mineral powder, an anti-corrosion agent, an expansion fiber anti-cracking waterproof agent, polypropylene anti-cracking fibers and an additive into a stirrer according to the formula table, stirring for 20s, then adding stirring water, stirring for 28s, finally adding broken stone, and stirring for 65s to obtain the concrete.
Example 2
Sequentially adding sand, cement, fly ash, mineral powder, an anti-corrosion agent, an expansion fiber anti-cracking waterproof agent, polypropylene anti-cracking fibers and an additive into a stirrer according to the formula table, stirring for 30s, then adding stirring water, stirring for 40s, finally adding broken stone, and stirring for 60s to obtain the concrete.
Example 3
And sequentially adding sand, cement, fly ash, mineral powder, an anti-corrosion agent, an expansion fiber anti-cracking waterproof agent, polypropylene anti-cracking fibers and an additive into a stirrer according to the formula table, stirring for 40s, then adding water for stirring for 40s, and finally adding broken stone for stirring for 45s to obtain the concrete.
Comparative example 1
And (3) sequentially adding sand, cement, fly ash and mineral powder into a stirrer according to the formula table, then adding mixing water for mixing for 40s, and finally adding broken stone for mixing for 60s to obtain the concrete.
Comparative example 2
Comparative example 3
The concrete of the above examples 1 to 3 and comparative examples 1 to 3 was subjected to the performance test, and the test results were as follows:
concrete compression strength comparison table
Comparison of Experimental data for impervious concrete
It can be seen that: tests show that the concrete in the embodiment of the invention has the strength improved by about 10-15% compared with standard concrete, and the crack resistance, the impermeability and the waterproof type are improved by more than 90% compared with a comparative example, namely, after the anti-corrosion anti-cracking waterproof agent, the fiber-reinforced high-performance expansion anti-cracking agent and the polypropylene anti-cracking fiber which are mixed in proper proportion, the impermeability of the concrete in the embodiment is greatly improved, and the probability of shrinkage cracks of the concrete is greatly reduced. The method has an important function of preventing the leachate of the waste incineration project, and has a very strong guiding function on other similar projects.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (11)
1. The concrete is characterized by comprising the following components:
cement 300-380kg/m 3 Sand 550-700 kg/m 3 850- 3 60-92kg/m of fly ash 3 93-115kg/m of mineral powder 3 5.2-8.3kg/m of additive 3 20-40kg/m of anti-corrosion preservative 3 22-38kg/m of anti-cracking waterproof agent for expansion fiber 3 0.55-1.2kg/m of anti-crack fiber 3 150-175kg/m water 3 。
2. The concrete according to claim 1, characterized in that it comprises the following components: cement 328kg/m 3 645kg/m of sand 3 1020kg/m of crushed stone 3 84kg/m of fly ash 3 110kg/m of mineral powder 3 7.83kg/m of admixture 3 35kg/m of anti-corrosion agent 3 35kg/m of expansion fiber anti-cracking waterproof agent 3 1kg/m of anti-crack fiber 3 167kg/m of water 3 。
3. The concrete according to claim 1, wherein the cement is p.o42.5 portland cement; the particle size of the sand is 0.25-0.5 mm, and the mud content is less than or equal to 3%; the particle size of the gravel is 5-40 mm.
4. The concrete of claim 1, wherein the admixture comprises: water reducing agent and pumping agent; wherein the weight ratio of the water reducing agent to the pumping agent is 1: 1.5.
5. The concrete as claimed in claim 1, wherein the fly ash is class II, the fineness is less than 25%, the loss on ignition is less than 8%, and the water demand ratio is less than 105%.
6. The concrete according to claim 1, wherein the anti-corrosion preservative is a SY-KS multifunctional anti-corrosion preservative; and/or the expansion fiber anti-cracking waterproof agent is a SY-K expansion fiber anti-cracking waterproof agent.
7. The concrete of claim 1, wherein the crack resistant fibers are selected from at least one of steel fibers and polypropylene crack resistant fibers.
8. A concrete construction method according to any one of claims 1 to 7, comprising the steps of:
stirring: sequentially adding sand, cement, fly ash, mineral powder anti-corrosion preservative, expansive fiber anti-cracking waterproof agent, polypropylene anti-cracking fiber and additive into a stirrer, stirring for a first preset time, then adding stirring water, stirring for a second preset time, and finally adding broken stone, and stirring for a third preset time to obtain concrete;
a transportation step, namely transporting the concrete obtained in the step to a platform pouring place, and then distributing the concrete to meet the requirements of continuous pouring and one-step forming of the beam concrete;
pouring and vibrating, namely pouring the concrete in a slope layered manner to build the garbage pool, vibrating the concrete of the wall body of the garbage pool by using an internal vibrator, and quickly inserting and slowly pulling the vibrating rod of the internal vibrator vertically downwards when the internal vibrator is used;
and curing, namely performing heat preservation curing on the concrete enclosed belt mold for 14 days.
9. The concrete construction method according to claim 10, wherein in the stirring step, the total time period of the first preset time period, the second preset time period and the third preset time period is less than or equal to 130 s.
10. The concrete construction method according to claim 10, wherein in the transporting step, the retention time of the concrete is 45min or less, the slump loss is 10% or less, and the total pouring time is 6 hours or less.
11. A landfill leachate treatment system, comprising: a leachate collection well and a landfill built with the concrete according to any one of claims 1 to 7; wherein the content of the first and second substances,
the garbage pool is communicated with the collecting well, and a cement-based permeable crystallization coating film layer and a waterproof coil material layer are sequentially paved on the inner side and the outer side of the garbage pool from inside to outside; a high-molecular coating anticorrosive layer is laid outside the cement-based permeable crystallization coating layer positioned on the inner wall of the garbage pool; the inner wall of the percolate collecting well is made of glass fiber reinforced plastics.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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