CN110606719A - Alkali-activated slag concrete and preparation process thereof - Google Patents
Alkali-activated slag concrete and preparation process thereof Download PDFInfo
- Publication number
- CN110606719A CN110606719A CN201911029012.6A CN201911029012A CN110606719A CN 110606719 A CN110606719 A CN 110606719A CN 201911029012 A CN201911029012 A CN 201911029012A CN 110606719 A CN110606719 A CN 110606719A
- Authority
- CN
- China
- Prior art keywords
- slag
- cement
- alkali
- percent
- concrete
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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
- C04B28/08—Slag cements
Abstract
The invention discloses alkali-activated slag concrete and a preparation process thereof, wherein the alkali-activated slag concrete comprises the following raw materials in parts by weight: 33.6 to 43.2 percent of slag, 4.8 to 14.4 percent of Portland cement, 19.2 percent of fine sand, 52 percent of stones and 8.9 percent of water. The method comprises the following steps: s1, weighing the raw materials according to the parts by weight, putting the slag and the cement in the raw materials into a stirrer for dry stirring until the slag and the portland cement are uniform, and then adding fine sand and stones for stirring for 3min to be uniform; s2, adding the weighed water into a stirrer, and stirring the slurry for 2min to be fully and uniformly; and S3, after the materials are stirred, transferring the materials into a mold for vibration molding, and then, transferring the mold to a curing box for curing and demolding to obtain a finished product. By adopting cement to replace the alkaline activator, the minimum dosage of the cement is only 4.8 percent of the total mass of the concrete, and the cement can excite the activity of slag in a finished product and improve the plasticity and strength of the formed concrete.
Description
Technical Field
The invention belongs to the technical field of slag treatment, and particularly relates to alkali-activated slag concrete and a preparation process thereof.
Background
Today, the low carbon and environmental requirements imposed in the construction industry have prompted us to seek materials to replace cement in commercial concrete to the utmost. Statistically, 7% of the global carbon dioxide emissions, 5% of the major industrial energy consumption and the production of large amounts of nitrogen oxides, sulfur dioxide, respirable particulates, mercury and other compounds are attributed to cement production. Blast furnace slag, fly ash, silica fume, which are by-products of blast furnace ironmaking or power plant coal, can react with alkali, a well-known pozzolanic activity. By the reaction of the auxiliary cementing material and alkali formed in the cement self-hydration process, on the basis of generating stress-bearing hydration products such as CSH gel and the like in the cement self-hydration process, the hydration products such as CSH gel and the like are also generated, and the performance of the hydration products can be comparable to or even better than that of the hydration products without the auxiliary cementing material. The supplementary cementitious material therefore not only acts as a filler in the microstructure of the paste, but also acts as a binder together with the cement.
Blast furnace slag is a mineral admixture with high volcanic gray level, usually the slag is accumulated for a long time, the utilization rate is low, certain harm is brought to the mine area environment, and part of the slag is researched and applied to replace cement. At present, the content of the blast furnace slag in the doped concrete is low, the utilization rate is low, and once the blast furnace slag with high doping content is doped, the strength of the formed concrete structure is reduced, so that the requirements of industry and buildings are difficult to meet.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide alkali-activated slag concrete and a preparation process thereof, and solves the problems that the concrete formed by doping blast furnace slag in the prior art has low content and low structural strength.
The purpose of the invention can be realized by the following technical scheme:
the alkali-activated slag concrete comprises the following raw materials in parts by weight: 33.6 to 43.2 percent of slag, 4.8 to 14.4 percent of Portland cement, 19.2 percent of fine sand, 52 percent of stones and 8.9 percent of water.
Further, the water cement ratio of the cement to the water is controlled to be between 0.35 and 0.55.
Further, the slag is granulated blast furnace slag powder with the apparent density of 2700-3。
Further, the index of the cement is 42.5R, and the apparent density is 3000-3200kg/m3. The preparation process of the alkali-activated slag concrete comprises the following steps:
s1, weighing the raw materials according to the parts by weight, putting the slag and the cement in the raw materials into a stirrer for dry stirring until the slag and the portland cement are uniform, and then adding fine sand and stones for stirring for 3min to be uniform;
s2, adding the weighed water into a stirrer, and stirring the slurry for 2min to be fully and uniformly;
and S3, after the materials are stirred, transferring the materials into a mold for vibration molding, and then, transferring the mold to a curing box for curing and demolding to obtain a finished product.
Further, the curing temperature of the curing box in the step S3 is controlled to be 23-80 ℃.
Further, the humidity of the curing box curing in the step S3 is controlled to be 90-92%.
The invention has the beneficial effects that:
1. by adopting cement to replace the alkaline activator, the minimum dosage of the cement is only 4.8 percent of the total mass of the concrete, and the cement can excite the activity of slag in a finished product and improve the plasticity and strength of the formed concrete.
2. The preparation process is simple to operate, low in material cost and energy consumption, clear in flow and suitable for industrial production. The alkali-activated slag concrete produced by the method has the advantages of high strength, high durability, high fire resistance, environmental protection and the like, and can effectively replace the main status of portland cement in concrete materials.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a graph of compressive strength data of alkali-activated slag concrete at different cement loadings according to example 1 of the present invention;
FIG. 2 is a graph of alkali-activated slag concrete compressive strength data for different water-to-cement ratios according to example 2 of the present invention;
FIG. 3 is a graph of compressive strength data of alkali-activated slag concrete at different curing temperatures in example 3 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
as shown in fig. 1, the present invention provides an alkali-activated slag concrete comprising slag, ordinary portland cement, sand, gravel, and tap water. The specific configuration is shown in table 1,
TABLE 1
| Item | Portland cement | Slag of mine | Sand | Stone | Water (W) |
| Reference group 1 | 331.2 | 1324.8 | 1600 | 4360 | 744 |
| Reference group 2 | 165.6 | 1490.4 | 1600 | 4360 | 744 |
| Reference group 3 | 248.4 | 1407.6 | 1600 | 4360 | 744 |
| Reference group 4 | 414 | 1242 | 1600 | 4360 | 744 |
| Reference group 5 | 496.8 | 1159.2 | 1600 | 4360 | 744 |
Wherein: the fineness modulus of the fine sand is 2.3, and the water-cement ratio is controlled between 0.35 and 0.55.
A preparation process of alkali-activated slag concrete comprises the following steps:
s1, weighing the raw materials according to the parts by weight, putting the slag and the cement in the raw materials into a stirrer for dry stirring until the slag and the portland cement are uniform, and then adding fine sand and stones for stirring for 3min to be uniform;
s2, adding the weighed water into a stirrer, and stirring the slurry for 2min to be fully and uniformly;
and S3, after the materials are stirred, transferring the materials into a mold for vibration molding, then transferring the mold to a curing box for curing, and demolding, wherein the curing temperature of the curing box is controlled at 23 ℃, and the humidity is controlled at 90-92% to obtain a finished product.
The following Table 1.1 shows the measurement of the compressive strength of the finished product (unit: MPa)
TABLE 1.1
Wherein 20%, 10%, 15%, 25%, 30% respectively represent the substitution amount of cement to slag.
Example 2:
as shown in FIG. 2, the invention provides an alkali-activated slag concrete, which comprises slag, ordinary portland cement, sand, stones and tap water, wherein the water-cement ratio is 0.45. The specific configuration is shown in table 2,
TABLE 2
| Labeling | Portland cement | Slag of mine | Sand | Stone | Water (W) |
| Reference group | 331.2 | 1324.8 | 1600 | 4360 | 744 |
The same preparation method as in example 1 was used to obtain the final product.
The following Table 2.1 shows the measurement of the compressive strength of the finished product (unit: MPa)
TABLE 2.1
Wherein: in the table, 20%, 10%, 15%, 25% represent the substitution amount of cement for slag, respectively; 23 ℃, 40 ℃, 60 ℃ and 80 ℃ respectively represent curing temperatures.
Example 3:
as shown in fig. 3, in the present embodiment, the slag concrete prepared by using cement-activated slag includes slag, ordinary portland cement, sand, gravel, and tap water. The specific formulation is shown in table 3, and each part in table 3 is the content in parts by weight.
TABLE 3
| Item | Portland cement | Slag of mine | Sand | Stone | Water (W) |
| Reference group 6 | 331.2 | 1324.8 | 1600 | 4360 | 744 |
| Reference group 7 | 309.68 | 1238.72 | 1600 | 4360 | 851.6 |
| Reference group 8 | 355.6 | 1422 | 1600 | 4360 | 622 |
The same preparation method as in example 1 was used to obtain the final product.
The following Table 3.1 shows the measurements of the compressive strength of the finished products (unit: MPa)
TABLE 3.1
Wherein: in the table, 20%, 10%, 15% represent the substitution amount of cement to slag; 23 ℃, 40 ℃ and 60 ℃ respectively represent different curing temperatures; 0.45, 0.55 and 0.35 represent water-cement ratios, respectively.
The performance index of the macadam used in the application is in accordance with the secondary requirement in the GB/T14685 of the existing national standard pebble and macadam for construction. The parameters of cement and slag at the same time are as follows:
when the slag replaces 43.2 percent of the cement component in the cement mortar, the 3-day strength reaches 20.60MPa, the 7-day strength reaches 31.61MPa, and the 28-day strength reaches 42.98 MPa.
In conclusion, the alkali-activated slag concrete and the preparation process thereof provided by the invention have the advantages that the cement is adopted to replace the alkali-activating agent, the lowest dosage of the alkali-activated slag concrete only accounts for 4.8% of the total mass of the concrete, the activity of the slag can be activated in a finished product, and the plasticity and the strength of the formed concrete are improved.
The preparation process is simple to operate, low in material cost and energy consumption, clear in flow and suitable for industrial production. The alkali-activated slag concrete produced by the method has the advantages of high strength, high durability, high fire resistance, environmental protection and the like, and can effectively replace the main status of portland cement in concrete materials. In the era of advocating environmental protection and energy conservation at present, the preparation of the alkali-activated slag concrete is just in process of production, and can be put into production on a large scale and widely applied to civil and commercial buildings.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.
Claims (7)
1. The alkali-activated slag concrete is characterized by comprising the following raw materials in parts by weight: 33.6 to 43.2 percent of slag, 4.8 to 14.4 percent of Portland cement, 19.2 percent of fine sand, 52 percent of stones and 8.9 percent of water.
2. The alkali-activated slag concrete according to claim 1, wherein the water-cement ratio of cement to water is controlled between 0.35 and 0.55.
3. The alkali-activated slag concrete as claimed in claim 1, wherein the slag is granulated blast furnace slag powder having an apparent density of 2700-3。
4. The alkali-activated slag concrete as claimed in claim 1, wherein the index designation of the cement is 42.5R, and the apparent density is 3000-3200kg/m3。
5. The process for the preparation of alkali-activated slag concrete according to any one of claims 1 to 4, characterized in that it comprises the following steps:
s1, weighing the raw materials according to the parts by weight, putting the slag and the cement in the raw materials into a stirrer for dry stirring until the slag and the portland cement are uniform, and then adding fine sand and stones for stirring for 3min to be uniform;
s2, adding the weighed water into a stirrer, and stirring the slurry for 2min to be fully and uniformly;
and S3, after the materials are stirred, transferring the materials into a mold for vibration molding, and then, transferring the mold to a curing box for curing and demolding to obtain a finished product.
6. The process for producing alkali-activated slag concrete according to claim 5, wherein the curing temperature of the curing box in the step S3 is controlled to be 23-80 ℃.
7. The process for preparing alkali-activated slag concrete according to claim 5, wherein the humidity of curing in the curing box in the step S3 is controlled to be 90-92%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911029012.6A CN110606719A (en) | 2019-10-28 | 2019-10-28 | Alkali-activated slag concrete and preparation process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911029012.6A CN110606719A (en) | 2019-10-28 | 2019-10-28 | Alkali-activated slag concrete and preparation process thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110606719A true CN110606719A (en) | 2019-12-24 |
Family
ID=68895250
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911029012.6A Pending CN110606719A (en) | 2019-10-28 | 2019-10-28 | Alkali-activated slag concrete and preparation process thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110606719A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112707699A (en) * | 2020-12-29 | 2021-04-27 | 安徽理工大学 | Method for recycling waste mortar by using citric acid and alkaline accelerating agent |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002029814A (en) * | 2000-07-18 | 2002-01-29 | Sugawara Doboku Kk | Concrete and method of manufacturing the same |
| CN102070317A (en) * | 2010-11-26 | 2011-05-25 | 北京新奥混凝土集团有限公司 | Mineral admixture concrete |
| CN102459118A (en) * | 2009-06-09 | 2012-05-16 | 竹本油脂株式会社 | Concrete composition using blast furnace slag composition |
| CN108203251A (en) * | 2018-03-01 | 2018-06-26 | 东北大学 | A kind of alkali-activated carbonatite blast-furnace cinder cementitious material and preparation method thereof |
-
2019
- 2019-10-28 CN CN201911029012.6A patent/CN110606719A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002029814A (en) * | 2000-07-18 | 2002-01-29 | Sugawara Doboku Kk | Concrete and method of manufacturing the same |
| CN102459118A (en) * | 2009-06-09 | 2012-05-16 | 竹本油脂株式会社 | Concrete composition using blast furnace slag composition |
| CN102070317A (en) * | 2010-11-26 | 2011-05-25 | 北京新奥混凝土集团有限公司 | Mineral admixture concrete |
| CN108203251A (en) * | 2018-03-01 | 2018-06-26 | 东北大学 | A kind of alkali-activated carbonatite blast-furnace cinder cementitious material and preparation method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112707699A (en) * | 2020-12-29 | 2021-04-27 | 安徽理工大学 | Method for recycling waste mortar by using citric acid and alkaline accelerating agent |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109095836B (en) | Recycled powder concrete for 3D printing construction and preparation method | |
| KR100884715B1 (en) | Composition of blended cement using high-volume industrial by-products and method of thereof | |
| CN105621907A (en) | Calcium-base geopolymer and preparation method thereof | |
| CN110606713A (en) | High-strength light aggregate concrete and preparation process thereof | |
| CN112408829B (en) | Solid waste reclaimed sand and preparation method and application thereof | |
| CN108585925A (en) | A kind of self heat-preserving concrete building block | |
| CN108147704B (en) | Composite mineral admixture, preparation method thereof and concrete prepared from same | |
| CN111170758A (en) | Foam concrete, preparation method and application thereof | |
| CN111807770A (en) | Ecological cement high-strength grouting material and preparation method thereof | |
| CN104609817A (en) | High temperature-resistant and high-toughness aerated brick and preparation method thereof | |
| CN111116159B (en) | Phosphogypsum steel pipe concrete and preparation method thereof | |
| CN110981337B (en) | Reactive powder concrete doped with waste glass powder and preparation method thereof | |
| CN101168483B (en) | High-performance panel concrete and preparation method thereof | |
| CN110498630B (en) | Concrete composite additive, preparation method thereof and concrete | |
| CN107522501A (en) | Air entrained concrete and preparation method thereof | |
| CN110922122A (en) | Low-hydration-heat high-strength volume concrete and preparation method thereof | |
| CN104150803A (en) | Alkali slag concrete water reducing agent | |
| CN110606719A (en) | Alkali-activated slag concrete and preparation process thereof | |
| CN110451840B (en) | Composite type compacting agent | |
| CN112174604A (en) | Dry-mixed masonry mortar | |
| CN115368103A (en) | Shrinkage-reducing anti-cracking alkali-activated slag mortar and preparation method thereof | |
| CN109437769A (en) | A kind of C30P10 subway concrete and preparation method thereof | |
| CN107619298A (en) | A kind of anti-accumulation of salt in the surface soil cement base seepy material | |
| CN108516741A (en) | A kind of Steel-slag Sand-straw ash mixes mortar and preparation method thereof again | |
| CN114804748A (en) | High-calcium fly ash/cement composite cementing material solidified clay and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20191224 |