CN110981380A - Concrete for underground pipeline and preparation method thereof - Google Patents
Concrete for underground pipeline and preparation method thereof Download PDFInfo
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- CN110981380A CN110981380A CN201911327528.9A CN201911327528A CN110981380A CN 110981380 A CN110981380 A CN 110981380A CN 201911327528 A CN201911327528 A CN 201911327528A CN 110981380 A CN110981380 A CN 110981380A
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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
- C04B28/08—Slag 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
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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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Abstract
The invention discloses concrete for an underground pipeline and a preparation method thereof, wherein the concrete comprises the following components in parts by mass: 240 parts of cementing material 200-one, 310 parts of natural sand 280-one, 420 parts of coarse aggregate 380-one and 80-90 parts of excitant, wherein the cementing material comprises 140 parts of fly ash 120-one, 40-50 parts of silica fume, 20-25 parts of mineral powder and 20-25 parts of metakaolin. The invention takes fly ash, mineral powder, silica fume and metakaolin as raw materials, does not generate ettringite in the hydration process, and because the calcium content of the mineral admixtures is less, the content of gypsum causing volume expansion is also very low, thereby being beneficial to improving the resistance to corrosion of sulfuric acid, and the discharge amount of carbon dioxide is greatly reduced by matching with a small amount of alkali-activator.
Description
Technical Field
The invention relates to an underground pipeline, in particular to concrete for the underground pipeline and a preparation method thereof.
Background
With the continuous improvement of the urbanization level of China, the promotion of infrastructure construction is a necessary trend, and an urban drainage pipe network system serving as an urban blood vessel is an indispensable important component of infrastructure, plays an important role in urban construction, production development, improvement of living standard of people and guarantee of normal operation of cities, and is a key ring for urban water pollution treatment and urban drainage and flood control. In recent years, with the rapid increase of urban population, domestic water is greatly increased, and meanwhile, the water pollution degree is improved, urban sewage pipelines in China mostly use concrete materials as main materials, a plurality of underground pipelines are too long to bury in the ground and lack of anti-corrosion measures, and under the corrosion of sewage with complex components in the year, local corrosion and damage are easily generated, on one hand, the soil and underground water pollution is caused by sewage leakage, on the other hand, the pipeline structure function is lost, and the road surface collapse is seriously caused. By the end of 2016, the total length of the underground pipeline in China is 346.5 kilometers, wherein the total length of the urban underground pipeline is 212.7 kilometers, and accounts for 61.39 percent of the total length of the underground pipeline in China. However, in recent years, underground pipeline accidents happen in domestic cities many times, so that serious life and property losses are caused, and only 298 domestic underground pipeline related accidents occur in the next half year of 2018. According to the statistics of the planning management center of the Ministry of construction, the direct economic loss caused by underground excavation in the whole country every year is up to 2000 billion yuan.
The sewage in the underground pipeline mainly comprises industrial wastewater and domestic sewage. The industrial wastewater is mainly discharged from manufacturing industry and energy industry, and the wastewater contains a large amount of corrosive acid and alkali inorganic compounds, mainly sulfides and various salts. The domestic wastewater contains a large amount of new organic waste (such as feces), corrosive washing products and planktonic microorganisms. According to different component types, sewage corrosion can be divided into inorganic corrosion, organic corrosion and microbial corrosion, wherein the corrosion action of acidic substances is an important source generated by chemical corrosion of underground pipelines, and the acidic corrosion refers to Ca (OH) in acidic water and concrete2The reaction produces soluble calcium salts which are carried away by leaching, causing concrete erosion. In addition to acidic substances contained in sewage itself, the generation of acidic substances by the vital activities of microorganisms is considered to be a major cause of corrosive damage to underground sewage pipes, mainly manifested as sulfuric acid-based corrosion.
The concrete pipeline manufacturing mainly uses ordinary portland cement, the production of the cement consumes a large amount of resources and energy sources and generates high greenhouse gas emission, the emission of carbon dioxide for producing 1 ton of portland cement clinker is about 1 ton, and about 8% of the emission of carbon dioxide is generated from the production of portland cement every year in the world. The development of the novel low-carbon corrosion-resistant cementing material and the popularization of the cementing material in pipeline engineering application provide powerful support for sustainable development of cement concrete and urban pipe network construction in China.
Disclosure of Invention
On the one hand, the invention aims to solve the problem of providing the concrete for the underground pipeline, the concrete adopts a special formula to replace common portland cement clinker, can greatly reduce the emission of carbon dioxide, and has better mechanical property and durability.
In order to achieve the above object, one aspect of the present invention provides a concrete for an underground pipeline, which comprises the following components in parts by mass: 240 parts of cementing material 200-one, 310 parts of natural sand 280-one, 420 parts of coarse aggregate 380-one and 80-90 parts of excitant, wherein the cementing material comprises 140 parts of fly ash 120-one, 40-50 parts of silica fume, 20-25 parts of mineral powder and 20-25 parts of metakaolin.
Preferably, the fly ash is class F class 1 fly ash.
Preferably, the specific surface area of the silica fume is 1800-1900cm2/g。
Preferably, the ore powder is S95 grade ore powder.
Preferably, the ore powder contains copper and/or cobalt.
Preferably, the activator comprises a sodium hydroxide solution and a soluble sodium silicate liquid and/or solid, the modulus of the activator is 1.5-2.5, and the sodium oxide accounts for 4-8% of the mass of the cementing material.
The invention also provides a preparation method of the concrete for the underground pipeline, which comprises the following steps:
1) adding 140 parts of fly ash, 40-50 parts of silica fume, 20-25 parts of mineral powder, 20-25 parts of metakaolin and 280-310 parts of natural sand into a stirrer by mass parts, and uniformly mixing;
2) then 80-90 parts of excitant and 380-420 parts of gravel are poured into the stirrer to be stirred and mixed evenly;
3) filling the mixture prepared in the step 2) into a mould for vibration molding;
4) standing at 15-25 deg.C for 1-2 days, removing mold, and curing in standard curing room at 18-22 deg.C and relative humidity above 95% for a specified age.
Preferably, the components of step 1) are dried to constant weight before being put into the blender.
Preferably, the preparation method of the ore powder in the step 1) comprises the following steps: adding Cu (NO)3)2Or Co (NO)3)2Adding the mixture into saline water with the mass concentration of 10-15%, and stirring the mixture until the mixture is completely dissolved; adding mineral powder into the solution, and stirring for 8-10 hours at the stirring speed of 140-; separating the copper or cobalt containing slag with filter paper; drying at 60-80 deg.C with a dryer to constant weight, and grinding into particles with particle diameter of 0.0156-0.0078 mm.
Preferably, the preparation method of the exciting agent in the step 2) comprises the following steps: firstly, dissolving NaOH solid in water, then mixing the solution with water glass, fully stirring and standing for 20-24 hours.
Through the technical scheme, the invention has the following beneficial effects:
(1) the fly ash, the mineral powder, the silica fume and the metakaolin are used as raw materials, no ettringite is generated in the hydration process, and the content of gypsum causing volume expansion is low due to the low content of calcium in the mineral admixtures, so that the improvement of the resistance to sulfuric acid corrosion is facilitated;
(2) according to the invention, a small amount of mineral powder is added, and the purpose is that the mineral powder can generate more C-A-S-H gel due to higher calcium content, although the microstructure of the concrete is more compact due to the formation of the C-A-S-H gel, so that the strength of the concrete is improved, a large amount of gypsum is generated due to the decalcification effect in a sulfuric acid environment, so that the volume is expanded, and a certain amount of mineral powder is doped to ensure the strength;
(3) the invention adds a certain amount of silica fume, and aims to improve the microstructure of the concrete and further improve the strength because the content of mineral powder is less, the fly ash is more, and the porosity of the concrete is very high, and fine particles of the silica fume can be filled in the gaps;
(4) the invention is micro-doped with a certain amount of copper and cobalt heavy metals because the addition of the copper and cobalt heavy metals can inhibit the formation of gypsum, reduce the porosity, inhibit the growth of bacteria and reduce the corrosion depth;
(5) the invention uses the exciting agent to be matched with the fly ash, the mineral powder, the silica fume and the metakaolin to replace the common portland cement clinker, thereby greatly reducing the emission of carbon dioxide.
Detailed Description
The following examples are provided to explain the present invention in detail. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
Example 1
1) Preparing the excitant
Mixing 8mol/L sodium hydroxide solution with liquid water glass produced by Hunan Pontan chemical industry Co., Ltd, stirring thoroughly, standing for 20 hr, and exciting agent modulus (SiO in exciting agent)2With Na2The equivalent molar ratio of O) is 1.5, the sodium oxide quality is controlled to be 4% of the cementing material (the cementing material in the invention comprises fly ash, silica fume, mineral powder and metakaolin, the same applies below), and the dosage of the sodium hydroxide solution and the liquid water glass can be determined by calculation according to the conditions.
2) And preparing mineral powder containing Cu/Co
20g of Cu (NO)3)2Adding into 1L 10% saline water, stirring to dissolve completely; adding 50g of mineral powder into the solution, and stirring for 8 hours at a stirring speed of 150 rpm; separating the copper-containing slag by using qualitative filter paper; drying the mixture to constant weight by a dryer at the temperature of 80 ℃; grinding into fine powder with particle size of 0.0156-0.0078 mm;
20g of Co (NO)3)2Adding into 1L 10% saline water, stirring to dissolve completely; adding 50g of mineral powder into the solution, and stirring for 8 hours at a stirring speed of 150 rpm; separating cobalt-containing slag by using qualitative filter paper; drying the mixture to constant weight by a dryer at the temperature of 80 ℃; grinding into fine powder with particle size of 0.0156-0.0078 mm.
3) And the pretreatment of the cementing material
And drying the fly ash, the silica fume, the mineral powder and the metakaolin to constant weight.
4) Preparing concrete
According to the mass parts, 120 parts of fly ash (F type 1 grade fly ash, the same below) and 40 parts of silica fume (the specific surface area is 1800 cm)2(g)), 20 parts of mineral powder (S95 grade mineral powder, the same below), 20 parts of metakaolin and 280 parts of natural sand (river sand is selected, and the bulk density is 1610kg/m3An apparent density of 2700kg/m3The same applies below) are put into a stirrer and mixed evenly; 80 parts of exciting agent and 380 parts of gravel (continuous gradation, particle diameter of 5-20cm, bulk density 1520 kg/m)3The apparent density is 2730kg/m3The same applies below) is poured into a stirrer to be stirred and mixed evenly; the prepared mixture is respectively filled into plastic moulds with the size of 100 multiplied by 100mm, and is molded by mechanical vibration; standing at 15 deg.C for 1 day, removing mold, and curing in standard curing room at 18 deg.C and relative humidity of above 95% for 28 d.
Example 2
1) Preparing the excitant
Mixing 8mol/L sodium hydroxide solution with soluble solid water glass produced by Hunan Pontan chemical industry Co., Ltd, fully stirring, standing for 24 hours, controlling the modulus of an excitant to be 2.5, controlling the quality of sodium oxide in the solution to be 8% of that of a gelled material, and determining the dosage of the sodium hydroxide solution and the liquid water glass by calculation according to conditions.
2) And preparing mineral powder containing Cu/Co
20g of Cu (NO)3)2Adding into 1L saline with concentration of 15%, stirring to dissolve completely; adding 50g of mineral powder into the solution, and stirring for 8 hours at a stirring speed of 150 rpm; separating the copper-containing slag by using qualitative filter paper; drying the mixture to constant weight by a dryer at the temperature of 60 ℃; grinding into fine powder with particle size of 0.0156-0.0078 mm;
20g of Co (NO)3)2Adding into 1L 10% saline water, stirring to dissolve completely; adding 50g of mineral powder into the solution, and stirring for 8 hours at a stirring speed of 150 rpm; separating cobalt-containing slag by using qualitative filter paper; drying the mixture to constant weight by a dryer at the temperature of 60 ℃; grinding into fine powder with particle size of 0.0156-0.0078mm。
3) And the pretreatment of the cementing material
And drying the fly ash, the silica fume, the mineral powder and the metakaolin to constant weight.
4) Preparing concrete
According to the mass parts, 140 parts of fly ash and 50 parts of silica fume (the specific surface area is 1900 cm)2/g), 25 parts of mineral powder, 25 parts of metakaolin and 310 parts of natural sand are put into a stirrer and are uniformly mixed; then pouring 90 parts of excitant and 420 parts of gravel into the stirrer to be stirred and evenly mixed; the prepared mixture is respectively filled into plastic moulds with the size of 100 multiplied by 100mm, and is molded by mechanical vibration; standing at 25 deg.C for 2 days, removing mold, and curing in standard curing room at 22 deg.C and relative humidity of above 95% for 28 d.
Example 3
1) Preparing the excitant
Mixing 8mol/L sodium hydroxide solution with liquid water glass produced by Hunan Pontan chemical industry Co., Ltd, fully stirring, standing for 22 hours, controlling the modulus of an excitant to be 2, controlling the quality of sodium oxide in the solution to be 6% of a gelled material, and determining the dosage of the sodium hydroxide solution and the liquid water glass by calculation according to conditions.
2) Preparing Cu-containing mineral powder
20g of Cu (NO)3)2Adding into 1L saline with concentration of 12%, stirring to dissolve completely; adding 50g of mineral powder into the solution, and stirring for 8 hours at a stirring speed of 150 rpm; separating the copper-containing slag by using qualitative filter paper; drying the mixture to constant weight by a dryer at 70 ℃; grinding into fine powder with particle size of 0.0156-0.0078 mm.
3) And the pretreatment of the cementing material
And drying the fly ash, the silica fume, the mineral powder and the metakaolin to constant weight.
4) Preparing concrete
130 parts of fly ash and 45 parts of silica fume (specific surface area of 1850 cm)2/g), 22 parts of mineral powder, 22 parts of metakaolin and 300 parts of natural sand are put into a stirrer and are uniformly mixed; then 85 parts of excitant and 400 parts of gravel are poured into a stirrer to be stirred,mixing uniformly; the prepared mixture is respectively filled into plastic moulds with the size of 100 multiplied by 100mm, and is molded by mechanical vibration; standing at 20 deg.C for 1 day, removing mold, and curing in standard curing room at 20 deg.C and relative humidity of above 95% for 28 d.
Example 4
1) Preparing the excitant
Mixing 8mol/L sodium hydroxide solution with liquid and soluble solid water glass (the mass of the liquid and the solid respectively accounts for half) produced by Hunan Pontan chemical industry Co., Ltd, fully stirring, standing for 23 hours, wherein the modulus of an excitant is 2.2, and the mass of sodium oxide is controlled to be 7% of that of the cementing material.
2) And preparing Co-containing mineral powder
20g of Co (NO)3)2Adding into 1L saline with concentration of 13%, stirring to dissolve completely; adding 50g of mineral powder into the solution, and stirring for 8 hours at a stirring speed of 150 rpm; separating the copper-containing slag by using qualitative filter paper; drying the mixture to constant weight by a dryer at the temperature of 80 ℃; grinding into fine powder with particle size of 0.0156-0.0078 mm.
3) And the pretreatment of the cementing material
And drying the fly ash, the silica fume, the mineral powder and the metakaolin to constant weight.
4) Preparing concrete
135 parts of fly ash and 48 parts of silica fume (specific surface area is 1880 cm)2/g), 23 parts of mineral powder, 23 parts of metakaolin and 290 parts of natural sand are put into a stirrer and are uniformly mixed; then 83 parts of excitant and 390 parts of gravel are poured into the stirrer to be stirred and mixed evenly; the prepared mixture is respectively filled into plastic moulds with the size of 100 multiplied by 100mm, and is molded by mechanical vibration; standing at 18 deg.C for 1 day, removing mold, and curing in standard curing room with temperature of 21 deg.C and relative humidity of above 95% for 28 d.
Comparative example 1
1) Preparing the excitant
Mixing 8mol/L sodium hydroxide solution with liquid water glass produced by Hunan Pontan chemical industry Co., Ltd, fully stirring, standing for 22 hours, wherein the modulus of the excitant is 2, and the quality of sodium oxide is controlled to be 6% of the gelled material.
2) And the pretreatment of the cementing material
And drying the fly ash, the silica fume, the mineral powder and the metakaolin to constant weight.
3) Preparing concrete
130 parts of fly ash and 45 parts of silica fume (specific surface area of 1850 cm)2/g), 22 parts of mineral powder, 22 parts of metakaolin and 300 parts of natural sand are put into a stirrer and are uniformly mixed; then pouring 85 parts of excitant and 400 parts of gravel into a stirrer to be stirred and uniformly mixed; the prepared mixture is respectively filled into plastic moulds with the size of 100 multiplied by 100mm, and is molded by mechanical vibration; standing at 20 deg.C for 1 day, removing mold, and curing in standard curing room at 20 deg.C and relative humidity of above 95% for 28 d.
Comparative example 2
1) Preparing the excitant
Mixing 8mol/L sodium hydroxide solution with liquid water glass produced by Hunan Pontan chemical industry Co., Ltd, fully stirring, standing for 22 hours, wherein the modulus of the excitant is 2, and the quality of sodium oxide is controlled to be 6% of the gelled material.
2) And the pretreatment of the cementing material
And drying the fly ash, the silica fume and the metakaolin to constant weight.
3) Preparing concrete
130 parts of fly ash and 45 parts of silica fume (specific surface area of 1850 cm)2Per gram), 22 parts of metakaolin and 300 parts of natural sand are put into a stirrer and are uniformly mixed; then pouring 85 parts of excitant and 400 parts of gravel into a stirrer to be stirred and uniformly mixed; the prepared mixture is respectively filled into plastic moulds with the size of 100 multiplied by 100mm, and is molded by mechanical vibration; standing at 20 deg.C for 1 day, removing mold, and curing in standard curing room at 20 deg.C and relative humidity of above 95% for 28 d.
Comparative example 3
1) Preparing the excitant
Mixing 8mol/L sodium hydroxide solution with liquid water glass produced by Hunan Pontan chemical industry Co., Ltd, fully stirring, standing for 20 hours, wherein the modulus of an excitant is 2, and the quality of sodium oxide is controlled to be 6% of the gelled material.
2) And preparing mineral powder containing Cu/Co
20g of Cu (NO)3)2Adding into 1L saline water with concentration of 12%, stirring to dissolve completely; adding 50g of mineral powder into the solution, and stirring for 8 hours at a stirring speed of 150 rpm; separating the copper-containing slag by using qualitative filter paper; drying the mixture to constant weight by a dryer at 40 ℃; grinding into fine powder with particle size of 0.0156-0.0078 mm.
3) And the pretreatment of the cementing material
And drying the fly ash, the mineral powder and the metakaolin to constant weight.
4) Preparing concrete
Putting 130 parts of fly ash, 22 parts of mineral powder, 22 parts of metakaolin and 300 parts of natural sand into a stirrer by mass parts, and uniformly mixing; then pouring 85 parts of excitant and 400 parts of gravel into a stirrer to be stirred and uniformly mixed; the prepared mixture is respectively filled into plastic moulds with the size of 100 multiplied by 100mm, and is molded by mechanical vibration; standing at 20 deg.C for 1 day, removing mold, and curing in standard curing room at 20 deg.C and relative humidity of above 95% for 28 d.
Comparative example 4
Preparation of ordinary concrete
Adding 174 parts of ordinary portland cement and 300 parts of natural sand into a stirrer by mass, and uniformly mixing; then pouring 85 parts of water and 400 parts of gravel into a stirrer for stirring and uniformly mixing; the prepared mixture is respectively filled into plastic moulds with the size of 100 multiplied by 100mm, and is molded by mechanical vibration; standing at 20 deg.C for 1 day, removing mold, and curing in standard curing room at 20 deg.C and relative humidity of above 95% for 28 d.
And (3) performance detection:
the following tests were carried out on the concretes obtained by the methods of examples 1 to 4 and comparative examples 1 to 4, respectively:
(1) corrosion and durability test
According to a test method specified in GB50224-2010 construction quality acceptance standard for building anti-corrosion engineering, the formed test block is put into 40% industrial sulfuric acid solution, soaked at the temperature of 20-25 ℃ for 28 days and nights, taken out, washed by water and dried in the shade for 24 hours, and the test block is observed to have bulging, crisp, cracks and falling corners.
According to the standard of the test method for the long-term performance and the durability of GB/T50082-2009 common concrete, after a test block is molded for 28d, the test block is sealed by paraffin and then placed into a concrete infiltration tester to detect the water infiltration height, and the detection result is shown in Table 1.
(2) Porosity detection
According to BS ISO 15901-1:2005 British standards Association: and evaluating the pore size distribution and porosity of the solid material by a mercury intrusion method and a gas adsorption method, and evaluating the pore structure of the high-acid-resistant low-carbon concrete by the mercury intrusion method to obtain the porosity of the high-acid-resistant low-carbon concrete.
(3) Intensity detection
According to GB50107-2010 concrete strength test and evaluation Standard, the cube compressive strength standard value is a cube test piece with the side length of 150mm, which is manufactured and maintained according to a standard method, and the probability that the strength is lower than the value is 5% in the total distribution of the concrete compressive strength measured by a standard test method in the 18d age.
(4) Carbon emission detection
The calculation of carbon emissions involved the production of CO in each activity2、CH4The release amount of greenhouse gases such as NO, and the like, and simultaneously, the energy dissipation when the fuel is completely combusted is considered, the types of the generated greenhouse gases and the respective global warming influence trend values.
CO2-e＝Q×EC×GWP
CO2E is CO2Emission, i.e. CO2Emission, Q is the fuel usage (kg) to complete an activity, EC is the energy of the fuel for an activity (J/kg), and GWP is the global warming potential value, referring to the sum of the greenhouse gas emissions (kg/J) emitted to complete a particular activity. The data was derived from the australian national greenhouse gas accounting database.
Table 1 test results of concrete Properties in examples
As can be seen from the above table, the concrete prepared by the components and the method of the invention has excellent corrosion resistance and durability, the porosity is greatly reduced, the strength is greatly improved, and the carbon emission is greatly reduced.
The preferred embodiments of the present invention have been described in detail with reference to the examples, but the present invention is not limited to the details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (10)
1. The concrete for the underground pipeline is characterized by comprising the following components in parts by mass: 240 parts of cementing material 200-one, 310 parts of natural sand 280-one, 420 parts of coarse aggregate 380-one and 80-90 parts of excitant, wherein the cementing material comprises 140 parts of fly ash 120-one, 40-50 parts of silica fume, 20-25 parts of mineral powder and 20-25 parts of metakaolin.
2. The concrete for an underground pipe according to claim 1, wherein the fly ash is class F class 1 fly ash.
3. Concrete for underground piping according to claim 1, wherein the silica fume is in a specific formThe area is 1800-2/g。
4. The concrete for underground piping according to claim 1, wherein the ore powder is grade S95 ore powder.
5. The concrete for an underground pipe according to claim 1, wherein the ore powder contains copper and/or cobalt.
6. The concrete for the underground pipeline as claimed in claim 1, wherein the activator comprises sodium hydroxide solution and soluble sodium silicate liquid and/or solid, the modulus of the activator is 1.5-2.5, and sodium oxide accounts for 4-8% of the mass of the cementing material.
7. A preparation method of concrete for underground pipelines is characterized by comprising the following steps:
1) adding 140 parts of fly ash, 40-50 parts of silica fume, 20-25 parts of mineral powder, 20-25 parts of metakaolin and 280-310 parts of natural sand into a stirrer by mass parts, and uniformly mixing;
2) then 80-90 parts of excitant and 380-420 parts of gravel are poured into the stirrer to be stirred and mixed evenly;
3) filling the mixture prepared in the step 2) into a mould for vibration molding;
4) standing at 15-25 deg.C for 1-2 days, removing mold, and curing in standard curing room at 18-22 deg.C and relative humidity above 95% for a specified age.
8. The method for preparing concrete for underground piping according to claim 7, wherein the components of step 1) are dried to a constant weight before being put into the mixer.
9. The method for preparing concrete for underground piping according to claim 7, wherein the ore powder in the step 1) is prepared by: adding Cu (NO)3)2Or Co (NO)3)2Adding the mixture into saline water with the mass concentration of 10-15%, and stirring the mixture until the mixture is completely dissolved; adding mineral powder into the solution, and stirring for 8-10 hours at the stirring speed of 140-; separating the copper or cobalt containing slag with filter paper; drying at 60-80 deg.C with a dryer to constant weight, and grinding into particles with particle diameter of 0.0156-0.0078 mm.
10. The method for preparing concrete for underground piping according to claim 7, wherein the exciting agent in the step 2) is prepared by: firstly, dissolving NaOH solid in water, then mixing the solution with water glass, fully stirring and standing for 20-24 hours.
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| CN111635170A (en) * | 2020-05-25 | 2020-09-08 | 惠州市海鸿水泥制品有限公司 | Concrete |
| CN112408899A (en) * | 2020-11-27 | 2021-02-26 | 陕西正元环保科技产业(集团)有限公司 | Volcanic ash based acid-resistant mortar and preparation method thereof |
| CN112851250A (en) * | 2021-01-29 | 2021-05-28 | 西安工业大学 | High-strength recycled concrete and preparation method and application thereof |
| CN112851157A (en) * | 2021-01-27 | 2021-05-28 | 广东能源集团科学技术研究院有限公司 | Fly ash cementing material and preparation method and application thereof |
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| CN112851250A (en) * | 2021-01-29 | 2021-05-28 | 西安工业大学 | High-strength recycled concrete and preparation method and application thereof |
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