CN112521067A - Acid-alkali corrosion resistant alkali-activated concrete material and preparation method thereof - Google Patents
Acid-alkali corrosion resistant alkali-activated concrete material and preparation method thereof Download PDFInfo
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- CN112521067A CN112521067A CN202011575482.5A CN202011575482A CN112521067A CN 112521067 A CN112521067 A CN 112521067A CN 202011575482 A CN202011575482 A CN 202011575482A CN 112521067 A CN112521067 A CN 112521067A
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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
- C04B28/006—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 mineral polymers, e.g. geopolymers of the Davidovits type
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/2023—Resistance against alkali-aggregate reaction
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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
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
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- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides an acid and alkali corrosion resistant alkali-activated concrete material and a preparation method thereof, wherein the alkali-activated concrete material is prepared from the following raw materials in parts by weight: 50-65 parts of water, 30-37 parts of alkali activator, 60-70 parts of slag, 5-10 parts of silica fume, 5-10 parts of nano silicon dioxide, 10-20 parts of lithium slag, 1-10 parts of fiber, 175 parts of fine aggregate 135-sand and 75-135 parts of coarse aggregate. The alkali-activated concrete material prepared by the invention has good acid-base corrosion resistance and high compressive strength.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to an alkali-activated concrete material resistant to acid and alkali corrosion and a preparation method thereof.
Background
In industrial construction, there are some construction works and construction structures which are in intimate contact with acidic and alkaline media. Typically, the hardened cement paste is an alkaline material, and the pH can typically reach 13.5. Even so, hardened cement slurries are extremely susceptible to attack by acidic solutions. Such as the erosion of concrete structures and concrete down pipes of municipal wastewater treatment plants by acidic solutions, etc. Meanwhile, although the pH value of the hardened cement paste can reach 13.5, the hydration product can still be damaged by the strong alkali solution. Generally, the ordinary cement concrete has a certain acid and alkali resistance, and when the acid and alkali medium exceeds a certain concentration, the ordinary cement concrete is damaged, so that the concrete with stronger acid and alkali resistance is necessary to be used for pouring under a specific environment. Moreover, the acid and alkali resistance of concrete materials is not good enough, so that a concrete material is urgently needed to solve the technical problems.
Disclosure of Invention
In view of the above, the invention provides an acid and alkali corrosion resistant alkali-activated concrete material and a preparation method thereof, which have good acid and alkali corrosion resistance and high compressive strength.
The technical scheme of the invention is realized as follows:
an acid-alkali corrosion resistant alkali-activated concrete material is prepared from the following raw materials in parts by weight: 50-65 parts of water, 30-37 parts of alkali activator, 60-70 parts of slag, 5-10 parts of silica fume, 5-10 parts of nano silicon dioxide, 10-20 parts of lithium slag, 1-10 parts of fiber, 175 parts of fine aggregate 135-sand and 75-135 parts of coarse aggregate.
Further, the fibers are chopped basalt fibers, the length of the chopped basalt fibers is 6-8mm, and the diameter of the chopped basalt fibers is 15 mm.
Further, the alkali activator is sodium water glass, and the modulus thereof is 2.3.
Further, the slag is granulated blast furnace slag.
Further, the fineness of the lithium slag is 390-410 m2/kg。
Further, the fine aggregate is river sand, and the fineness modulus of the fine aggregate is 2.5-2.9.
Furthermore, the coarse aggregate is limestone with the particle size range of 5-31mm, the grading is good, and the alkali dissolution rate is less than 0.48 g/L.
The invention also provides a preparation method of the acid and alkali corrosion resistant alkali-activated concrete material, which comprises the following steps:
1) weighing the raw materials according to the weight part ratio;
2) crushing and screening the coarse aggregate by using a jaw crusher;
3) sequentially adding the fine aggregate, the slag, the silica fume, the nano-silica, the lithium slag and the fiber into a stirrer, and starting the stirrer to dry and stir at a low speed for 1.5-3 minutes; then, sequentially adding water, an alkali activator and an additive, and continuously stirring for 0.5-1.5 minutes; and then adding the coarse aggregate, and continuously stirring for 0.5-1.5 minutes to prepare the acid and alkali resistant alkali activated concrete material.
Further, in the step 3), the rotating speed of the slow dry mixing is 1-3 r/min.
Compared with the prior art, the invention has the beneficial effects that:
the invention adopts the lithium slag, the fiber, the nano silicon dioxide, the silica fume, the alkali activator, the slag, the combined fine aggregate and the coarse aggregate, optimizes the proportion, more fully exerts the potential of each raw material, improves the acid-base corrosion resistance and the mechanical property, and has higher compressive strength.
(1) According to the invention, the interface combination condition of the concrete is improved by adding the silica fume and the nano silicon dioxide together, so that the structure of the concrete is more compact. The silica fume is amorphous spherical particles, has smaller average particle size and good filling effect, can be filled in gaps among the particles of the cementing material, and improves the strength and durability of concrete; the nano silicon dioxide has extremely strong pozzolanic activity, crystal nucleus effect and micro aggregate filling effect, and can effectively fill the internal pores of concrete when being added into the concrete, so that the compactness of the concrete is improved, and the mechanical property, acid and alkali resistance of the concrete are enhanced.
(2) Meanwhile, the lithium slag is used for obviously improving the acid resistance of the concrete, probably because the lithium slag contains more SO3In the course of the alkali-activated reaction, SO3And certain reaction is carried out with some calcium compounds in hydration products, and the generated substances play an effective role in the compactness of concrete.
(3) And the alkali corrosion resistance of the concrete is improved by using the chopped basalt fibers and the limestone aggregate together, and the finally compounded alkali-activated concrete can resist acid and alkali, has a compact internal structure, good corrosion resistance and long service life.
(4) Meanwhile, the invention has the advantages of simple raw materials, stable quality, relatively low production cost, wide application range and better market prospect.
Detailed Description
In order to better understand the technical content of the invention, specific examples are provided below to further illustrate the invention.
The experimental methods used in the examples of the present invention are all conventional methods unless otherwise specified.
The materials, reagents and the like used in the examples of the present invention can be obtained commercially without specific description.
Example 1
An acid and alkali corrosion resistant alkali-activated concrete material is prepared from the following raw materials in parts by weight: 60kg of water, 33kg of alkali activator, 65kg of slag, 8kg of silica fume, 7kg of nano silicon dioxide, 15kg of lithium slag, 5kg of fiber, 155kg of fine aggregate and 110kg of coarse aggregate;
the water is tap water;
the alkali activator is sodium silicate, and the modulus of the alkali activator is 2.3;
the slag is granulated blast furnace slag;
the fineness of the lithium slag is 400m2/kg；
The fiber is chopped basalt fiber, the length of the fiber is 6-8mm, and the diameter of the fiber is 15 mm;
the fine aggregate is river sand, and the fineness modulus of the fine aggregate is 2.5-2.9;
the coarse aggregate is limestone with the particle size range of 5-31mm and the alkali dissolution rate of less than 0.48 g/L.
Example 2
The difference between the embodiment and the embodiment 1 is that the alkali-activated concrete material resistant to acid and alkali corrosion is prepared from the following raw materials in parts by weight: 50kg of water, 30kg of alkali activator, 70kg of slag, 10kg of silica fume, 5kg of nano silicon dioxide, 20kg of lithium slag, 10kg of fiber, 175kg of fine aggregate and 75kg of coarse aggregate.
Example 3
The difference between the embodiment and the embodiment 1 is that the alkali-activated concrete material resistant to acid and alkali corrosion is prepared from the following raw materials in parts by weight: 65kg of water, 37kg of alkali activator, 60kg of slag, 5kg of silica fume, 10kg of nano-silica, 10kg of lithium slag, 1kg of fiber, 135kg of fine aggregate and 135kg of coarse aggregate.
The preparation method of the alkali-activated concrete material of the above embodiments 1 to 3 includes the following steps:
1) weighing the raw materials according to the weight part ratio;
2) crushing and screening the coarse aggregate by using a jaw crusher;
3) sequentially adding the fine aggregate, the slag, the silica fume, the nano-silicon dioxide, the lithium slag and the fiber into a stirrer, and starting the stirrer to dry and stir at a low speed of 2r/min for about 2 minutes; then, sequentially adding water, an alkali activator and an additive, and continuously stirring for 1 minute; and adding the coarse aggregate, and continuously stirring for 1 minute to form acid-base-alkali-activated concrete slurry, thereby obtaining the acid-base-alkali-activated concrete material.
Comparative example 1-this comparative example differs from example 1 in that the lithium slag was replaced with an equal amount of slag.
Comparative example 2-this comparative example differs from example 1 in that the nanosilica replaces an equal amount of silica fume.
Comparative example 3-this comparative example is different from example 1 in that the length of the basalt fiber is 10 to 12 mm.
The alkali-activated concrete material prepared by the above embodiment and the comparative proportion is subjected to compressive strength and acid and alkali corrosion resistance tests.
1. Compressive strength: a concrete cube (with the side length of 150mm) is tested according to the standard of concrete physical mechanical property test method GB/T50081-2019.
2. And (3) acid and alkali corrosion resistance testing:
2.1 blank: the concrete cubes (side length 150mm) are placed in a standard room for 56 days, the change is observed, and the compressive strength P is tested0；
2.2 acid resistance: concrete cubes (side length 150mm) were immersed in 10 w/w% sulfuric acid solution for 56 days, observed for changes, and tested for compressive strength PaThe acid etch resistance coefficient was calculated by comparison with a blank control (P)a/P0)*100％；
2.3 alkali resistance: concrete cubes (side length 150mm) were soaked in 30 w/w% sodium hydroxide solution for 56 days, the change was observed and the compressive strength P was testedbThe alkali corrosion resistance coefficient (P) was calculated by comparison with a blank controlb/P0)*100％。
The test results were as follows:
| 28d compressive strength/MPa | Acid resistance (56d) | Alkali resistance (56d) | |
| Example 1 | 118.0 | 99.8％ | 100.0％ |
| Example 2 | 114.1 | 99.3％ | 99.7％ |
| Example 3 | 116.6 | 99.6％ | 99.8％ |
| Comparative example 1 | 92.5 | 76.3％ | 92.2％ |
| Comparative example 2 | 96.9 | 82.3％ | 87.1％ |
| Comparative example 3 | 105.8 | 98.5％ | 93.4％ |
The results show that the alkali-activated concrete material prepared in the embodiments 1 to 3 of the invention has good acid-base corrosion resistance and high compressive strength.
Wherein, the lithium slag in the raw material of the comparative example 1 is replaced by the slag with the same amount, namely when the lithium slag is not added in the raw material, the acid resistance of the prepared concrete is obviously reduced, and the compressive strength of the concrete is obviously reduced after 28 days. Therefore, the acid resistance and the compressive strength of the alkali-activated concrete material are effectively improved by adding the lithium slag.
Compared with the comparative example 2, the nano silicon dioxide in the raw material replaces the same amount of silica fume, so that the acid and alkali resistance of the prepared concrete is reduced, and the 28-day compressive strength of the concrete is also reduced. Therefore, the selected silica fume and the nano-silica are combined with other components to obviously improve the durability and the compressive strength of the alkali-activated concrete material.
The length of the basalt fiber in the raw material of the comparative example 3 is 10-12mm, even if longer basalt fiber is used, the alkali resistance of the prepared concrete is reduced, and the 28-day compressive strength is also reduced. Therefore, the chopped basalt fiber is particularly beneficial to improving the alkali resistance and the compressive strength of the alkali-activated concrete material.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. The acid and alkali corrosion resistant alkali-activated concrete material is characterized by being prepared from the following raw materials in parts by weight: 50-65 parts of water, 30-37 parts of alkali activator, 60-70 parts of slag, 5-10 parts of silica fume, 5-10 parts of nano silicon dioxide, 10-20 parts of lithium slag, 1-10 parts of fiber, 175 parts of fine aggregate 135-sand and 75-135 parts of coarse aggregate.
2. The acid and alkali corrosion resistant alkali-activated concrete material according to claim 1, wherein the fibers are chopped basalt fibers, have a length of 6-8mm and a diameter of 15 mm.
3. The acid and alkali corrosion resistant alkali-activated concrete material of claim 1, wherein said alkali activator is sodium silicate with a modulus of 2.3.
4. The acid and alkali corrosion resistant alkali-activated concrete material according to claim 1, wherein the slag is granulated blast furnace slag.
5. The acid and alkali corrosion resistant alkali-activated concrete material as claimed in claim 1, wherein the fineness of the lithium slag is 390-410 m2/kg。
6. The acid and alkali corrosion resistant alkali-activated concrete material according to claim 1, wherein the fine aggregate is river sand, and the fineness modulus is 2.5-2.9.
7. The acid and alkali corrosion resistant alkali-activated concrete material according to claim 1, wherein the coarse aggregate is limestone with a particle size ranging from 5mm to 31mm and an alkali dissolution rate of less than 0.48 g/L.
8. The method for preparing the acid and alkali corrosion resistant alkali-activated concrete material according to any one of claims 1 to 7, characterized by comprising the following steps:
1) weighing the raw materials according to the weight part ratio;
2) crushing and screening the coarse aggregate by using a jaw crusher;
3) sequentially adding the fine aggregate, the slag, the silica fume, the nano-silica, the lithium slag and the fiber into a stirrer, and starting the stirrer to dry and stir at a low speed for 1.5-3 minutes; then, sequentially adding water, an alkali activator and an additive, and continuously stirring for 0.5-1.5 minutes; and then adding the coarse aggregate, and continuously stirring for 0.5-1.5 minutes to prepare the acid and alkali resistant alkali activated concrete material.
9. The method for preparing the acid and alkali corrosion resistant alkali-activated concrete material according to any one of claims 1 to 8, wherein in the step 3), the rotation speed of the slow dry mixing is 1 to 3 r/min.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011575482.5A CN112521067A (en) | 2020-12-28 | 2020-12-28 | Acid-alkali corrosion resistant alkali-activated concrete material and preparation method thereof |
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| CN202011575482.5A CN112521067A (en) | 2020-12-28 | 2020-12-28 | Acid-alkali corrosion resistant alkali-activated concrete material and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113480259A (en) * | 2021-07-21 | 2021-10-08 | 鞍钢股份有限公司 | High-crack-resistance large-volume concrete prepared from metallurgical solid wastes and method thereof |
| CN117756487A (en) * | 2023-12-14 | 2024-03-26 | 北京科技大学 | Lithium slag cementing material and preparation method thereof |
-
2020
- 2020-12-28 CN CN202011575482.5A patent/CN112521067A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113480259A (en) * | 2021-07-21 | 2021-10-08 | 鞍钢股份有限公司 | High-crack-resistance large-volume concrete prepared from metallurgical solid wastes and method thereof |
| CN117756487A (en) * | 2023-12-14 | 2024-03-26 | 北京科技大学 | Lithium slag cementing material and preparation method thereof |
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Inventor after: Wang Junfeng Inventor after: Wang Jianping Inventor after: Liu Jinhong Inventor before: Wang Junfeng |
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| CB03 | Change of inventor or designer information |