CN112441793A - Economical and environment-friendly concrete and preparation method thereof - Google Patents
Economical and environment-friendly concrete and preparation method thereof Download PDFInfo
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- CN112441793A CN112441793A CN202011316870.1A CN202011316870A CN112441793A CN 112441793 A CN112441793 A CN 112441793A CN 202011316870 A CN202011316870 A CN 202011316870A CN 112441793 A CN112441793 A CN 112441793A
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- 239000004567 concrete Substances 0.000 title claims abstract description 89
- 238000002360 preparation method Methods 0.000 title abstract description 8
- 239000004576 sand Substances 0.000 claims abstract description 121
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 74
- 239000004568 cement Substances 0.000 claims abstract description 63
- 239000000843 powder Substances 0.000 claims abstract description 44
- 229910021536 Zeolite Inorganic materials 0.000 claims abstract description 37
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000002994 raw material Substances 0.000 claims abstract description 37
- 239000010457 zeolite Substances 0.000 claims abstract description 37
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 35
- 239000011435 rock Substances 0.000 claims abstract description 35
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 33
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 33
- 238000003756 stirring Methods 0.000 claims description 32
- 239000002245 particle Substances 0.000 claims description 18
- 239000007787 solid Substances 0.000 claims description 18
- 239000004575 stone Substances 0.000 claims description 16
- 239000002253 acid Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 abstract description 11
- 230000008901 benefit Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 3
- 239000011707 mineral Substances 0.000 abstract description 3
- 238000006467 substitution reaction Methods 0.000 description 11
- 239000011398 Portland cement Substances 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 7
- 239000003292 glue Substances 0.000 description 6
- 238000005303 weighing Methods 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 229920005646 polycarboxylate Polymers 0.000 description 5
- 239000008030 superplasticizer Substances 0.000 description 5
- 230000000740 bleeding effect Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 238000007655 standard test method Methods 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 239000002969 artificial stone Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000012958 reprocessing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012360 testing method Methods 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
- 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
-
- 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
-
- 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/047—Zeolites
-
- 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/06—Quartz; Sand
- C04B14/068—Specific natural sands, e.g. sea -, beach -, dune - or desert sand
-
- 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
-
- 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)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses an economic and environment-friendly concrete and a preparation method thereof, wherein the concrete comprises the following raw material components: the water-reducing agent comprises water, cement, coarse aggregate, fine aggregate, zeolite rock powder, graphene oxide and a water-reducing agent, wherein the fine aggregate comprises desert sand and machine-made sand. The invention greatly reduces the raw material cost of the concrete by selecting the desert sand which is wide in source, low in price and easy to obtain to replace the machine-made sand, is environment-friendly and has extremely high economic benefit; by using the zeolite rock powder as the mineral admixture, on one hand, the grading of the cementing material can be improved, so that the compressive strength of concrete is improved, and on the other hand, the volcanic ash activity of the zeolite rock powder can replace a part of cement, so that the cement consumption is reduced, the cost is low, and the environment is protected; by adding the graphene oxide, the strength of the concrete is further improved.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to economical and environment-friendly concrete and a preparation method thereof.
Background
Concrete is one of the most important civil engineering materials of the present generation. It is an artificial stone material made up by using cementing material, granular aggregate (also called aggregate), water and additive and admixture which are added according to a certain proportion through the processes of uniformly stirring, compacting, forming, curing and hardening.
With the development of infrastructure in China, the requirements of civil engineering field on the quality and economic benefit of concrete are increasingly intensified.
Disclosure of Invention
The invention mainly aims to provide economical and environment-friendly concrete and a preparation method thereof, and aims to provide concrete with high strength and low cost.
In order to achieve the purpose, the invention provides an economic and environment-friendly concrete, which comprises the following raw material components: the water-reducing agent comprises water, cement, coarse aggregate, fine aggregate, zeolite rock powder, graphene oxide and a water-reducing agent, wherein the fine aggregate comprises desert sand and machine-made sand.
Optionally, the water-cement ratio of the concrete is 0.27-0.31, the sand rate is 32-40%, and the mass percentage of the desert sand in the fine aggregate is 20-80%; and/or the presence of a gas in the gas,
the weight of the water reducing agent is 1-2% of the total weight of the cement and the zeolite rock powder; and/or the presence of a gas in the gas,
the weight of the graphene oxide is 10% -15% of the total weight of the cement and the zeolite rock powder.
Optionally, the water-cement ratio of the concrete is 0.29, the sand rate is 32%, and the mass percentage of the desert sand in the fine aggregate is 40%.
Optionally, the water-cement ratio of the concrete is 0.27, the sand rate is 36%, and the mass percentage of the desert sand in the fine aggregate is 40%.
Optionally, the water-cement ratio of the concrete is 0.27, the sand rate is 40%, and the mass percentage of the desert sand in the fine aggregate is 60%.
Optionally, the water-cement ratio of the concrete is 0.27, the sand rate is 32%, and the mass percentage of the desert sand in the fine aggregate is 80%.
Optionally, the concrete comprises the following raw materials in parts by weight: 146 parts of water, 432 parts of cement, 1070 parts of coarse aggregate, 109 parts of desert sand, 435 parts of machine-made sand, 38 parts of zeolite rock powder, 52 parts of graphene oxide and 5.4 parts of a water reducing agent.
Optionally, the fineness modulus of the desert sand is 0.3-1.2, and the mud content is less than 0.5%.
Optionally, the coarse aggregate is crushed stone with the particle size of 5-10 mm, the content of needle and flaky particles is not more than 12.0%, the content of mud is not more than 1.0%, and the content of mud lumps is not more than 0.5%; and/or the presence of a gas in the gas,
the water reducing agent is a polycarboxylic acid water reducing agent.
Based on the formula of the concrete, the invention also provides a preparation method of the economical and environment-friendly concrete, which comprises the following steps:
mixing cement, coarse aggregate, fine aggregate, zeolite rock powder, graphene oxide and part of water, and stirring for 5-8 min at the rotating speed of 300-400 r/min to obtain a solid raw material;
and (3) uniformly dispersing the water reducing agent in the rest water, adding the water reducing agent into the solid raw material, and stirring for 5-8 min at the rotating speed of 400-500 r/min to obtain the concrete.
In the technical scheme provided by the invention, the desert sand which is wide in source, low in price and easy to obtain is selected to replace the machine-made sand, so that the raw material cost of the concrete is greatly reduced, and the concrete is environment-friendly and has extremely high economic benefit; by using the zeolite rock powder as the mineral admixture, on one hand, the grading of the cementing material can be improved, so that the compressive strength of concrete is improved, and on the other hand, the volcanic ash activity of the zeolite rock powder can replace a part of cement, so that the cement consumption is reduced, the cost is low, and the environment is protected; by adding the graphene oxide, the strength of the concrete is further improved.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments.
It should be noted that those whose specific conditions are not specified in the examples were performed according to the conventional conditions or the conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention. 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.
Concrete is one of the most important civil engineering materials of the present generation. It is an artificial stone material made up by using cementing material, granular aggregate (also called aggregate), water and additive and admixture which are added according to a certain proportion through the processes of uniformly stirring, compacting, forming, curing and hardening.
With the development of infrastructure in China, the requirements of civil engineering field on the quality and economic benefit of concrete are increasingly intensified.
In view of the above, the invention provides an economic and environment-friendly concrete, which comprises the following raw material components: the water-reducing agent comprises water, cement, coarse aggregate, fine aggregate, zeolite rock powder, graphene oxide and a water-reducing agent, wherein the fine aggregate comprises desert sand and machine-made sand.
In the technical scheme provided by the invention, the desert sand which is wide in source, low in price and easy to obtain is selected to replace the machine-made sand, so that the raw material cost of the concrete is greatly reduced, and the concrete is environment-friendly and has extremely high economic benefit; by using the zeolite rock powder as the mineral admixture, on one hand, the grading of the cementing material can be improved, so that the compressive strength of concrete is improved, and on the other hand, the volcanic ash activity of the zeolite rock powder can replace a part of cement, so that the cement consumption is reduced, the cost is low, and the environment is protected; by adding the graphene oxide, the strength of the concrete is further improved.
The fine aggregate selected in the concrete is usually machine-made sand formed by processing, however, with the deterioration of river channel environment and the reduction of river sand reserves in these years, the price of river sand is excessively long, so that the cost of the fine aggregate is increased, and the cost of the fine aggregate is further increased due to the need of reprocessing of the machine-made sand. The desert resources in China are rich, and the inventor researches and contrasts various desert sands and finds that the Guerbantong Gute desert sand, the Mao Usu desert sand, the Ulan cloth and the desert sand, the Tenggery desert sand or the Kubu neat desert sand can not only reduce the sand rate of the concrete but also ensure the compressive strength of the concrete when the machine-made sand is replaced by the Guerbantong Gute desert sand, the Mao Usu desert sand, the Umbean desert sand and the desert sand. Specifically, the selection standard of the machine-made sand can be quantified as that the fineness modulus is 2.8-3.1, the mud content is not more than 3.0%, the mud block content is not more than 1.0%, the MBV value is not more than 1.4, the stone powder content is not more than 3%, and the water content is not more than 6%; the selection standard of the desert sand can be quantified into the desert sand with the fineness modulus of 0.3-1.2 and the mud content of less than 0.5 wt%, and the desert sand under the fineness modulus can be used for improving the aggregate gradation of concrete and optimizing the internal pore structure of the concrete, so that the compressive strength of the concrete is improved.
In the embodiment, the coarse aggregate can be crushed stone with the particle size of 5-10 mm, and in the coarse aggregate, the content of needle and flaky particles is not more than 12.0%, the content of mud is not more than 1.0%, and the content of mud blocks is not more than 0.5%. The needle, the flaky particle content, the sludge content, and the sludge cake content are all expressed in weight percent (wt%).
Furthermore, the proportion of each raw material component is optimized, in one embodiment, the water-cement ratio of the concrete is 0.27-0.31, the sand rate is 32-40%, the mass percentage content of the desert sand in the fine aggregate (namely the desert sand substitution rate) is 20-80%, and the sand rate is reduced and the concrete has good compressive strength while the desert sand ratio is increased as much as possible by controlling the water-cement ratio, the sand rate and the desert sand substitution rate. Wherein, the water-cement ratio refers to the weight ratio of water to the cementing material, and in this embodiment, the weight of the cementing material refers to the total weight of cement and zeolite rock powder; the sand fraction refers to the weight percentage of fine aggregate in the whole aggregates (fine aggregate and coarse aggregate).
In the process of exploring the mixture ratio of each raw material component of the concrete, the inventor discovers that the influence of the water-cement ratio, the sand rate and the desert sand substitution rate on the concrete strength in the concrete system has non-uniformity, and through investigation, the concrete in the following examples has higher strength: in the first embodiment, the water-cement ratio of the concrete is 0.29, the sand rate is 32%, and the mass percentage of the desert sand in the fine aggregate is 40%; in a second embodiment, the water-cement ratio of the concrete is 0.27, the sand rate is 36%, and the mass percentage of the desert sand in the fine aggregate is 40%; in a third embodiment, the water-cement ratio of the concrete is 0.27, the sand rate is 40%, and the mass percentage of the desert sand in the fine aggregate is 60%; in a fourth embodiment, the water-cement ratio of the concrete is 0.27, the sand rate is 32%, and the mass percentage of the desert sand in the fine aggregate is 80%.
In addition, as a preferred embodiment, in this embodiment, the concrete includes the following raw materials in parts by weight: 146 parts of water, 432 parts of cement, 1070 parts of coarse aggregate, 109 parts of desert sand, 435 parts of machine-made sand, 38 parts of zeolite rock powder, 52 parts of graphene oxide and 5.4 parts of a water reducing agent, wherein the sand rate is 34%, the water-cement ratio is 0.31, and the desert sand substitution rate is 20%.
In this embodiment, the graphene oxide is an oxide of graphene, and is commercially available. The graphene oxide is added into the concrete, so that the strength of the concrete can be further improved. Optionally, the weight of the graphene oxide is 10% -15% of the total weight of the cement and the zeolite rock powder.
In addition, the other components should meet the following criteria: the cement comprises one or more of Portland cement, ordinary Portland cement and composite Portland cement; the water reducing agent is preferably a polycarboxylic acid water reducing agent; the weight of the water reducing agent is 1-2% of the total weight of the cement and the zeolite rock powder.
Based on the formula of the concrete, the invention also provides a preparation method of the economical and environment-friendly concrete, which is used for preparing the concrete. The preparation method of the concrete comprises the following steps:
and step S10, mixing cement, coarse aggregate, fine aggregate, zeolite rock powder, graphene oxide and part of water, and stirring for 5-8 min at the rotating speed of 300-400 r/min to obtain the solid raw material.
And step S20, uniformly dispersing the water reducing agent in the rest water, adding the water reducing agent into the solid raw material, and stirring for 5-8 min at the rotating speed of 400-500 r/min to obtain the concrete.
The technical solutions of the present invention are further described in detail with reference to the following specific examples, which should be understood as merely illustrative and not limitative.
Example 1
(1) Weighing the raw material components according to the following formula: 146 parts of water, 432 parts of cement, 1070 parts of coarse aggregate, 109 parts of desert sand, 435 parts of machine-made sand, 38 parts of zeolite rock powder, 52 parts of graphene oxide and 5.4 parts of polycarboxylic acid water reducer. Wherein, the sand rate is 34 percent, the water-to-glue ratio is 0.31, and the desert sand substitution rate is 20 percent. In addition, the cement is portland cement; the coarse aggregate is crushed stone with the particle size of 5-10 mm, the content of needle and flaky particles is not more than 12.0%, the content of mud is not more than 1.0%, and the content of mud blocks is not more than 0.5%; the fineness modulus of the machine-made sand is 2.8-3.1, the mud content is not more than 3.0%, the mud block content is not more than 1.0%, the MBV value is not more than 1.4, the stone powder content is not more than 3%, and the water content is not more than 6%; the fineness modulus of the desert sand is 0.3-1.2, and the mud content is less than 0.5%.
(2) Adding cement, coarse aggregate, fine aggregate, zeolite rock powder, graphene oxide and part of water into a mixing stirrer, uniformly stirring, controlling the rotating speed of the mixing stirrer to be 400r/min, stirring for 8min, and obtaining a solid raw material after stirring.
(3) And (3) uniformly dispersing the polycarboxylate superplasticizer in the rest water, adding the water into a mixing stirrer filled with solid raw materials, controlling the rotating speed of the mixing stirrer to be 400r/min, and stirring for 5min to obtain the concrete.
Example 2
(1) Weighing the raw material components according to the following formula: 146 parts of water, 450 parts of cement, 1270 parts of coarse aggregate, 239 parts of desert sand, 359 parts of machine-made sand, 53 parts of zeolite rock powder, 75.5 parts of graphene oxide and 5 parts of polycarboxylic acid water reducing agent. Wherein, the sand rate is 32 percent, the water-to-glue ratio is 0.29, and the desert sand substitution rate is 40 percent. In addition, the cement is portland cement; the coarse aggregate is crushed stone with the particle size of 5-10 mm, the content of needle and flaky particles is not more than 12.0%, the content of mud is not more than 1.0%, and the content of mud blocks is not more than 0.5%; the fineness modulus of the machine-made sand is 2.8-3.1, the mud content is not more than 3.0%, the mud block content is not more than 1.0%, the MBV value is not more than 1.4, the stone powder content is not more than 3%, and the water content is not more than 6%; the fineness modulus of the desert sand is 0.3-1.2, and the mud content is less than 0.5%.
(2) Adding cement, coarse aggregate, fine aggregate, zeolite rock powder, graphene oxide and part of water into a mixing stirrer, uniformly stirring, controlling the rotating speed of the mixing stirrer to be 350r/min, stirring for 8min, and obtaining a solid raw material after stirring.
(3) And (3) uniformly dispersing the polycarboxylate superplasticizer in the rest water, adding the water into a mixing stirrer filled with solid raw materials, controlling the rotating speed of the mixing stirrer to be 400r/min, and stirring for 8min to obtain the concrete.
Example 3
(1) Weighing the raw material components according to the following formula: 200 parts of water, 512 parts of cement, 1200 parts of coarse aggregate, 270 parts of desert sand, 405 parts of machine-made sand, 229 parts of zeolite rock powder, 74 parts of graphene oxide and 14.8 parts of polycarboxylic acid water reducing agent. Wherein, the sand rate is 36 percent, the water-to-glue ratio is 0.27, and the desert sand substitution rate is 40 percent. In addition, the cement is portland cement; the coarse aggregate is crushed stone with the particle size of 5-10 mm, the content of needle and flaky particles is not more than 12.0%, the content of mud is not more than 1.0%, and the content of mud blocks is not more than 0.5%; the fineness modulus of the machine-made sand is 2.8-3.1, the mud content is not more than 3.0%, the mud block content is not more than 1.0%, the MBV value is not more than 1.4, the stone powder content is not more than 3%, and the water content is not more than 6%; the fineness modulus of the desert sand is 0.3-1.2, and the mud content is less than 0.5%.
(2) Adding cement, coarse aggregate, fine aggregate, zeolite rock powder, graphene oxide and part of water into a mixing stirrer, uniformly stirring, controlling the rotating speed of the mixing stirrer to be 300r/min, stirring for 7min, and obtaining a solid raw material after stirring.
(3) And (3) uniformly dispersing the polycarboxylate superplasticizer in the rest water, adding the water into a mixing stirrer filled with solid raw materials, controlling the rotating speed of the mixing stirrer to be 400r/min, and stirring for 6min to obtain the concrete.
Example 4
(1) Weighing the raw material components according to the following formula: 200 parts of water, 512 parts of cement, 1200 parts of coarse aggregate, 480 parts of desert sand, 320 parts of machine-made sand, 229 parts of zeolite rock powder, 89 parts of graphene oxide and 11 parts of polycarboxylic acid water reducing agent. Wherein the water-to-glue ratio is 0.27, the sand rate is 40%, and the desert sand substitution rate is 60%. In addition, the cement is portland cement; the coarse aggregate is crushed stone with the particle size of 5-10 mm, the content of needle and flaky particles is not more than 12.0%, the content of mud is not more than 1.0%, and the content of mud blocks is not more than 0.5%; the fineness modulus of the machine-made sand is 2.8-3.1, the mud content is not more than 3.0%, the mud block content is not more than 1.0%, the MBV value is not more than 1.4, the stone powder content is not more than 3%, and the water content is not more than 6%; the fineness modulus of the desert sand is 0.3-1.2, and the mud content is less than 0.5%.
(2) Adding cement, coarse aggregate, fine aggregate, zeolite rock powder, graphene oxide and part of water into a mixing stirrer, uniformly stirring, controlling the rotating speed of the mixing stirrer to be 300r/min, stirring for 6min, and obtaining a solid raw material after stirring.
(3) And (3) uniformly dispersing the water reducing agent in the rest water, adding the water reducing agent into a mixing stirrer filled with solid raw materials, controlling the rotating speed of the mixing stirrer to be 500r/min, and stirring for 5min to obtain the concrete.
Example 5
(1) Weighing the raw material components according to the following formula: 146 parts of water, 432 parts of cement, 1000 parts of coarse aggregate, 377 parts of desert sand, 94 parts of machine-made sand, 109 parts of zeolite rock powder, 55 parts of graphene oxide and 5.4 parts of polycarboxylic acid water reducing agent. Wherein the water-to-glue ratio is 0.27, the sand rate is 32%, and the desert sand substitution rate is 80%. In addition, the cement is portland cement; the coarse aggregate is crushed stone with the particle size of 5-10 mm, the content of needle and flaky particles is not more than 12.0%, the content of mud is not more than 1.0%, and the content of mud blocks is not more than 0.5%; the fineness modulus of the machine-made sand is 2.8-3.1, the mud content is not more than 3.0%, the mud block content is not more than 1.0%, the MBV value is not more than 1.4, the stone powder content is not more than 3%, and the water content is not more than 6%; the fineness modulus of the desert sand is 0.3-1.2, and the mud content is less than 0.5%.
(2) Adding cement, coarse aggregate, fine aggregate, zeolite rock powder, graphene oxide and part of water into a mixing stirrer, uniformly stirring, controlling the rotating speed of the mixing stirrer to be 300r/min, stirring for 5min, and obtaining a solid raw material after stirring.
(3) And (3) uniformly dispersing the polycarboxylate superplasticizer in the rest water, adding the water into a mixing stirrer filled with solid raw materials, controlling the rotating speed of the mixing stirrer to be 460r/min, and stirring for 5min to obtain the concrete.
Example 6
(1) Weighing the raw material components according to the following formula: 150 parts of water, 442 parts of cement, 1070 parts of coarse aggregate, 230 parts of desert sand, 346 parts of machine-made sand, 58 parts of zeolite rock powder, 70 parts of graphene oxide and 10 parts of polycarboxylic acid water reducer. Wherein, the sand rate is 35 percent, the water-to-glue ratio is 0.30, and the desert sand substitution rate is 40 percent. In addition, the cement is portland cement; the coarse aggregate is crushed stone with the particle size of 5-10 mm, the content of needle and flaky particles is not more than 12.0%, the content of mud is not more than 1.0%, and the content of mud blocks is not more than 0.5%; the fineness modulus of the machine-made sand is 2.8-3.1, the mud content is not more than 3.0%, the mud block content is not more than 1.0%, the MBV value is not more than 1.4, the stone powder content is not more than 3%, and the water content is not more than 6%; the fineness modulus of the desert sand is 0.3-1.2, and the mud content is less than 0.5%.
(2) Adding cement, coarse aggregate, fine aggregate, zeolite rock powder, graphene oxide and part of water into a mixing stirrer, uniformly stirring, controlling the rotating speed of the mixing stirrer to be 300r/min, stirring for 5min, and obtaining a solid raw material after stirring.
(3) And (3) uniformly dispersing the polycarboxylate superplasticizer in the rest water, adding the water into a mixing stirrer filled with solid raw materials, controlling the rotating speed of the mixing stirrer to be 480r/min, and stirring for 7min to obtain the concrete.
Comparative example 1
Except that the raw material components are changed into 235 parts of water, 432 parts of cement, 1070 parts of coarse aggregate, 321 parts of desert sand, 1284 parts of machine-made sand, 38 parts of zeolite powder, 52 parts of graphene oxide and 5.4 parts of polycarboxylic acid water reducer, the other steps are the same as the example 1, and in the concrete of the comparative example, the water-cement ratio is 0.5, the sand rate is 60 percent, and the desert sand substitution rate is 20 percent.
Comparative example 2
The procedure was the same as in example 1 except for the removal of the zeolite powder and graphene oxide.
The concrete of examples 1 to 6 and comparative examples 1 and 2 were subjected to performance tests, which included: slump, normal pressure bleeding rate, air content and compressive strength. The results are shown in Table 1.
The test method is as follows:
slump: the slump is detected according to GB/T50080-2016 Standard test method for the Performance of common concrete mixtures.
Normal-pressure bleeding rate: the bleeding rate is detected according to GB/T50080-2016 Standard test method for the Performance of common concrete mixtures.
Gas content: the gas content is detected according to GB/T50080-2016 Standard test method for the Performance of common concrete mixtures.
Compressive strength: the compressive strength of the concrete at day 28 was measured according to the method of appendix C of JGJ/T372-2016 concrete application Specification.
Table 1 results of performance testing
| Slump/mm | Normal pressure bleeding rate (%) | Gas content (%) | Compressive strength (MPa) | |
| Example 1 | 198 | 0 | 4.9 | 76 |
| Example 2 | 207 | 0 | 4.2 | 76.7 |
| Example 3 | 190 | 0 | 3.5 | 74.2 |
| Example 4 | 205 | 0 | 3.6 | 76.3 |
| Example 5 | 210 | 0 | 5.1 | 72.5 |
| Example 6 | 191 | 0 | 4.7 | 73.5 |
| Comparative example 1 | 202 | 0 | 3.8 | 53.1 |
| Comparative example 2 | 195 | 0 | 4.0 | 64.6 |
As can be seen from Table 1 above, the compressive strength of each example is significantly higher than that of the comparative example, which shows that the formulation of the present invention effectively improves the compressive strength of concrete.
The above is only a preferred embodiment of the present invention, and it is not intended to limit the scope of the invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall be included in the scope of the present invention.
Claims (10)
1. The economical and environment-friendly concrete is characterized by comprising the following raw material components: the water-reducing agent comprises water, cement, coarse aggregate, fine aggregate, zeolite rock powder, graphene oxide and a water-reducing agent, wherein the fine aggregate comprises desert sand and machine-made sand.
2. The economical and environment-friendly concrete as claimed in claim 1, wherein the water-to-cement ratio of the concrete is 0.27-0.31, the sand rate is 32-40%, and the mass percentage of the desert sand in the fine aggregate is 20-80%; and/or the presence of a gas in the gas,
the weight of the water reducing agent is 1-2% of the total weight of the cement and the zeolite rock powder; and/or the presence of a gas in the gas,
the weight of the graphene oxide is 10% -15% of the total weight of the cement and the zeolite rock powder.
3. The economical and environment-friendly concrete as claimed in claim 2, wherein the water-cement ratio of the concrete is 0.29, the sand rate is 32%, and the mass percentage of the desert sand in the fine aggregate is 40%.
4. The economical and environment-friendly concrete as claimed in claim 2, wherein the water-to-cement ratio of the concrete is 0.27, the sand rate is 36%, and the mass percentage of the desert sand in the fine aggregate is 40%.
5. The economical and environment-friendly concrete as claimed in claim 2, wherein the water-to-cement ratio of the concrete is 0.27, the sand rate is 40%, and the mass percentage of the desert sand in the fine aggregate is 60%.
6. The economical and environment-friendly concrete as claimed in claim 2, wherein the water-to-cement ratio of the concrete is 0.27, the sand rate is 32%, and the mass percentage of the desert sand in the fine aggregate is 80%.
7. The economical and environment-friendly concrete as claimed in claim 1, wherein the concrete comprises the following raw materials in parts by weight: 146 parts of water, 432 parts of cement, 1070 parts of coarse aggregate, 109 parts of desert sand, 435 parts of machine-made sand, 38 parts of zeolite rock powder, 52 parts of graphene oxide and 5.4 parts of a water reducing agent.
8. The economical and environment-friendly concrete as claimed in claim 1, wherein the fineness modulus of the desert sand is 0.3-1.2, and the mud content is less than 0.5%.
9. The economical and environment-friendly concrete as claimed in claim 1, wherein the coarse aggregate is crushed stone of 5-10 mm, and has a needle and flake particle content of not more than 12.0%, a mud content of not more than 1.0%, and a mud cake content of not more than 0.5%; and/or the presence of a gas in the gas,
the water reducing agent is a polycarboxylic acid water reducing agent.
10. The method for preparing economical and environment-friendly concrete according to any one of claims 1 to 9, comprising the steps of:
mixing cement, coarse aggregate, fine aggregate, zeolite rock powder, graphene oxide and part of water, and stirring for 5-8 min at the rotating speed of 300-400 r/min to obtain a solid raw material;
and (3) uniformly dispersing the water reducing agent in the rest water, adding the water reducing agent into the solid raw material, and stirring for 5-8 min at the rotating speed of 400-500 r/min to obtain the concrete.
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