CN116655326A - Low-carbon desert sand concrete and preparation process thereof - Google Patents
Low-carbon desert sand concrete and preparation process thereof Download PDFInfo
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- CN116655326A CN116655326A CN202310647485.2A CN202310647485A CN116655326A CN 116655326 A CN116655326 A CN 116655326A CN 202310647485 A CN202310647485 A CN 202310647485A CN 116655326 A CN116655326 A CN 116655326A
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- Prior art keywords
- desert sand
- carbon
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- concrete
- low
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- 239000004576 sand Substances 0.000 title claims abstract description 64
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 48
- 238000002360 preparation method Methods 0.000 title abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000010881 fly ash Substances 0.000 claims abstract description 22
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 11
- 239000000203 mixture Substances 0.000 claims abstract description 10
- 239000004575 stone Substances 0.000 claims description 22
- 238000003756 stirring Methods 0.000 claims description 21
- 239000002245 particle Substances 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 2
- 239000011259 mixed solution Substances 0.000 claims description 2
- 239000003469 silicate cement Substances 0.000 claims 1
- 239000004568 cement Substances 0.000 abstract description 11
- 230000015572 biosynthetic process Effects 0.000 abstract description 3
- 239000000843 powder Substances 0.000 abstract description 3
- 239000002893 slag Substances 0.000 abstract description 3
- 238000006467 substitution reaction Methods 0.000 description 5
- 239000002994 raw material Substances 0.000 description 4
- 239000011398 Portland cement Substances 0.000 description 2
- 238000003763 carbonization Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000001112 coagulating effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000035622 drinking Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000004579 marble Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 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
- 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
-
- 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
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
-
- 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 discloses low-carbon desert sand concrete and a preparation process thereof, and belongs to the field of concrete. The concrete provided by the invention comprises the following components in parts by mass: 1000-1200 parts of graded coarse aggregate, 350-450 parts of middle sand, 50-150 parts of desert sand, 450-600 parts of cementing mixture, 5-10 parts of water reducer and 150-200 parts of water. According to the invention, the cement consumption is reduced by the I-level fly ash doping amount, and desertification desert sand is adopted to replace the sand in the machine, so that the novel low-carbon desert sand concrete with the carbon footprint lower than the traditional content is formed, the formation of the carbon footprint can be reduced, the engineering cost is reduced, the environment is protected, the resources are saved, and the environment-friendly and easily-obtained slag powder, fly ash and desertification desert sand resources can be reasonably developed and reused.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to low-carbon desert sand concrete and a preparation process thereof, which are suitable for concrete structure engineering of buildings and roads.
Background
The building industry gradually realizes green low-carbon transformation and upgrading, and simultaneously combines the prior and current technology for preparing common concrete with a large amount of cement as cementing materials, natural sand exploitation, stone as coarse and fine aggregates and water uniformly prepared and stirred according to a certain proportion, thereby being widely applied to civil engineering. In the process of urban treatment, the construction of the national infrastructure is raised suddenly, and the demand of concrete is increased suddenly, which inevitably leads to the increase of the consumption of cement and medium sand.
In the process of the abnormal military protrusion of the infrastructure, the dosage of concrete cement and medium sand is increased, and the carbon footprint of the concrete is hidden by CO 2 The novel low-carbon desert sand concrete mainly originates from cement, although the carbon emission of concrete per unit weight is not high, the total carbon emission is caused to rapidly increase when the huge consumption required by global infrastructure is multiplied as a base number, and a novel low-carbon desert sand concrete with carbon footprint lower than the traditional content is needed to be researched.
The patent application No. 2015104460475 discloses desert sand concrete which is prepared from the following raw materials in proportion: the water-cement ratio is 0.4, the sand-lime ratio is 1/2-1/1, the substitution rate of desert sand is 15% -25%, and the mixing amount of fly ash is 10% -15%; the water reducer accounts for 1.0 to 1.5 percent. It can be seen that the application of desert sand to concrete to reduce building energy consumption has been explored in practice, but how to improve the application effect is always a problem worthy of further study.
Disclosure of Invention
1. Technical problem to be solved by the invention
The invention aims to reduce the cement consumption by the I-level fly ash doping amount, and adopts desertification desert sand to replace the machine-made sand again to form the novel low-carbon desert sand concrete with carbon footprint lower than the traditional content, thereby not only reducing the formation of carbon footprint, reducing engineering cost, protecting environment and saving resources, but also reasonably developing and reutilizing environment-friendly and easily-obtained slag powder, fly ash and desertification desert sand resources.
2. Technical proposal
In order to achieve the above purpose, the technical scheme provided by the invention is as follows:
the low-carbon desert sand concrete is novel low-carbon concrete with carbon footprint lower than the traditional content, but the mechanical property is basically the same as or even slightly improved as that of the traditional common concrete, and the raw materials are metered by an electronic scale in parts by weight: 1000-1200 parts of graded coarse aggregate, 350-450 parts of middle sand, 50-150 parts of desert sand, 450-600 parts of cementing mixture, 5-10 parts of water reducer and 150-200 parts of water. The water is tap water for drinking.
More optimally, the graded coarse aggregate is formed by uniformly stirring and mixing large stones and small stones, wherein the particle size of the small stones is 5-10 mm, the particle size of the large stones is 10-25 mm, and the mass ratio of the large stones to the small stones is: small stone= (3-4): 1.
more optimally, the middle sand is fine aggregate with the particle size of 0.15mm-4.75mm, the mud content not exceeding 0.61% and the fineness modulus of 2.3-3.0%.
More optimally, the desert sand is desert sand with the mud content of desertification of less than 0.15 percent and the fineness modulus of 0.15-0.3 percent in northwest areas.
More optimally, the cementing mixture is formed by uniformly stirring and mixing the I fly ash and the ordinary Portland cement, wherein the I fly ash is the fly ash with the water content not exceeding 0.2%, the activity index of 70-75% and the loss on ignition of 2.5-3.0%, wherein the substitution rate of the I fly ash can be different, namely the ratio of the I fly ash to the ordinary Portland cement is different, and the mass ratio of the I fly ash in the cementing mixture is particularly 0-25%.
More optimally, the water reducer is a powdery polycarboxylic acid high-performance water reducer, and the water reducing rate reaches 25% -30%.
The preparation process of the low-carbon desert sand concrete comprises the following steps of:
s1, adding the dried graded coarse aggregate, medium sand and desert sand into a stirrer, uniformly stirring, and covering a sealing cover;
wherein the preparation of the graded coarse aggregate comprises the following steps: the method comprises the steps of cleaning and drying small stones with the particle size of 5-10 mm and large stones with the particle size of 10-25 mm with clean water, and measuring the water content of the small stones, namely, using large stones: small stone= (3-4): 1, uniformly stirring and mixing the components in parts by weight;
s2, opening a sealing cover to add the gel mixed material, and covering the sealing cover to stir; specifically, the rotation speed of the stirring shaft is 45-60r/min, and the dry stirring time is not less than 45s, preferably 45-80s.
S3, opening a sealing cover, adding the mixed solution formed by uniformly stirring the water reducer and water, and continuously stirring to form the low-carbon desert sand concrete. Specifically, the rotation speed of the stirring shaft is 45-60r/min, and the time for uniform wet mixing is not less than 120s, preferably 120-150s.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
(1) According to the low-carbon desert sand concrete, the cement consumption serving as a coagulating material is reduced, the sand in the fine aggregate is replaced, and the coarse aggregate, the middle sand and the desert sand are cleaned and dried, so that the cohesiveness of the cement gel material is enhanced, the coarse aggregate and the fine aggregate are completely wrapped, gaps of the coarse aggregate and the fine aggregate are completely filled, the compactness of the inner structure and the outer structure of the concrete is improved, the damage of the external environment to the concrete is resisted, and the service life of the concrete is prolonged.
(2) The low-carbon desert sand concrete is novel low-carbon concrete with carbon footprint lower than the traditional content, and the popularization of the novel low-carbon concrete not only can reduce the formation of carbon footprint, reduce engineering cost, protect environment and save resources, but also can reasonably develop and reuse the environment-friendly and easily-obtained slag powder, fly ash and desertified desert sand resources.
Drawings
FIG. 1 is a flow chart of the process for preparing the low-carbon desert sand concrete.
Detailed Description
For a further understanding of the present invention, the present invention will be described in detail with reference to the drawings.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The invention is further described below with reference to examples.
Examples
The composition of the raw materials of the low-carbon desert sand concrete of the embodiment is shown in the following table 1, the preparation process parameters of the embodiments are shown in the following table 2, and the performance test information of the concrete obtained by the embodiments is shown in the following table 3.
Table 1, example raw material composition information table, unit: parts by mass
| Scheme for the production of a semiconductor device | Marble stone | Small stone | Middle sand | Desert sand | Fly ash | Cement and its preparation method | Water reducing agent | Water and its preparation method |
| Example 1 | 960 | 240 | 350 | 100 | 0 | 450 | 5 | 200 |
| Example 2 | 840 | 280 | 397 | 99 | 50 | 550 | 5 | 190 |
| Example 3 | 800 | 200 | 400 | 150 | 55 | 495 | 10 | 150 |
| Example 4 | 910 | 240 | 420 | 50 | 112 | 447 | 8 | 160 |
| Example 5 | 840 | 210 | 450 | 80 | 150 | 450 | 6 | 150 |
TABLE 2 stirring Process information Table for examples
TABLE 3 concrete Performance test information Table for each example
The low-carbon desert sand concrete of the embodiment can be tested to obtain that the slump of the low-carbon desert sand concrete is increased along with the increase of the substitution rate of the I fly ash, so that the workability of the concrete is improved; 28d surface carbonization depth, 7d and 28d compressive strength increase and decrease with increasing fly ash substitution rateLess, proper amount of fly ash is added, wherein Al 2 O 3 Active components such as CaO and the like are subjected to strong chemical reaction in the concrete, the internal structure is observed to be connected through a 2000 times high-power electron microscope, the inter-internal binding force and the carbonization resistance of the concrete are improved, the compressive strength and the like meet the specification, and the optimal substitution rate in practice can be 10%. Meanwhile, when a proper amount of environment-friendly and easily available fly ash is added, the mechanical property technical index is basically the same as or even slightly improved compared with that of the traditional common concrete. According to the invention, the cement consumption is reduced by the I-level fly ash doping amount, and the desertification desert sand is adopted to replace sand in a machine to prepare the low-carbon desert sand concrete, so that the compactness of the internal and external structures of the concrete is improved, the damage of the external environment to the concrete is resisted, the service life of the concrete is prolonged, the carbon emission is reduced, the footprint formed by carbon is reduced, the natural ecological environment is protected, the cost is saved, the green transformation of the production life style is accelerated, the carbon peak action is advanced steadily and orderly, and the safe carbon reduction standard is ensured.
The invention and its embodiments have been described above by way of illustration and not limitation, but rather one of the embodiments of the invention is not limited thereto. Therefore, if one of ordinary skill in the art is informed by this disclosure, the structural mode and the embodiments similar to the technical scheme are not creatively designed without departing from the gist of the present invention.
Claims (10)
1. The low-carbon desert sand concrete is characterized in that: the components of the composition comprise the following components in parts by weight: 1000-1200 parts of graded coarse aggregate, 350-450 parts of middle sand, 50-150 parts of desert sand, 450-600 parts of cementing mixture, 5-10 parts of water reducer and 150-200 parts of water.
2. The low carbon desert sand concrete of claim 1 and further comprising: the graded coarse aggregate is formed by uniformly stirring and mixing large stones and small stones, wherein the particle size of the small stones is 5-10 mm, the particle size of the large stones is 10-25 mm, and the mass ratio of the large stones to the small stones is: small stone= (3-4): 1.
3. the low carbon desert sand concrete of claim 1 and further comprising: the middle sand is fine aggregate with particle size of 0.15-4.75 mm, mud content not more than 0.61% and fineness modulus of 2.3-3.0%.
4. The low carbon desert sand concrete of claim 1 and further comprising: the desert sand has mud content not more than 0.15% and fineness modulus of 0.15-0.3%.
5. The low carbon desert sand concrete of claim 1 and further comprising: the cementing mixture is formed by uniformly stirring and mixing the I fly ash and the silicate cement, wherein the I fly ash is the fly ash with the water content not exceeding 0.2%, the activity index of 70-75% and the loss on ignition of 2.5-3.0%.
6. The low carbon desert sand concrete of claim 1 and further comprising: the mass ratio of the fly ash I in the gel mixture reaches 0-25%.
7. The low carbon desert sand concrete of claim 1 and further comprising: the water reducer is a powdery polycarboxylic acid high-performance water reducer, and the water reducing rate reaches 25% -30%.
8. The process for preparing low-carbon desert sand concrete according to any one of claims 1 to 7, which is characterized in that: the method comprises the following steps:
s1, adding the dried graded coarse aggregate, medium sand and desert sand into a stirrer, uniformly stirring, and covering a sealing cover;
s2, opening a sealing cover to add the gel mixed material, and covering the sealing cover to stir;
s3, opening a sealing cover, adding the mixed solution formed by uniformly stirring the water reducer and water, and continuously stirring to form the low-carbon desert sand concrete.
9. The process for preparing low-carbon desert sand concrete according to claim 8, which is characterized in that: and S2, the rotating speed of the stirring shaft is 45-60r/min, and the dry stirring time is not less than 45S.
10. The process for preparing low-carbon desert sand concrete according to claim 8, which is characterized in that: and S3, the rotating speed of the stirring shaft is 45-60r/min, and the wet stirring time is not less than 120S.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310647485.2A CN116655326A (en) | 2023-06-01 | 2023-06-01 | Low-carbon desert sand concrete and preparation process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310647485.2A CN116655326A (en) | 2023-06-01 | 2023-06-01 | Low-carbon desert sand concrete and preparation process thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116655326A true CN116655326A (en) | 2023-08-29 |
Family
ID=87718631
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310647485.2A Pending CN116655326A (en) | 2023-06-01 | 2023-06-01 | Low-carbon desert sand concrete and preparation process thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116655326A (en) |
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2023
- 2023-06-01 CN CN202310647485.2A patent/CN116655326A/en active Pending
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