CN109942235A - Room temperature conserves ground polymers concrete of high-strength high anti-carbonation properties and preparation method thereof - Google Patents
Room temperature conserves ground polymers concrete of high-strength high anti-carbonation properties and preparation method thereof Download PDFInfo
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- 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
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Abstract
The invention discloses a kind of ground polymers concrete of high-strength high anti-carbonation properties and preparation method thereof of room temperature maintenance, including compound sa powder, compound aqueous slkali, fine aggregate, coarse aggregate, modified powder and water-reducing agent.The present invention is with flyash-slag for compound sa powder, and modified powder (calcined hydrotalcite) is added to promote the intensity and anti-carbonation properties of ground polymers concrete, while guaranteeing that ground polymers concrete normal construction uses, meet it in the requirement of the safety and endurance quality of building structure.
Description
Technical field
The present invention relates to construction material, civil engineering technology, in particular to a kind of room temperature conserves high-strength high anti-carbonation properties
Ground polymers concrete and preparation method thereof.
Background technique
Geo-polymer (referred to as polymers) is that a kind of class zeolite hydraulicity with three-dimensional space net structure is inorganic poly-
Object material is closed, the poly- polycondensation reaction of solution is occurred with highly basic by the raw material rich in sial element and is synthesized[1].Relative to common silicic acid
Salt water cement concrete, the ground polymers concrete prepared by ground polymer material matrix have early strength height, anti-permeability performance strong, resistance to
It is soda acid, high temperature resistant, corrosion-resistant and the advantages that hardly happen alkali with aggregate, thus learned both at home and abroad in recent years
The extensive concern of person.Natural sa raw material such as kaolin and its calcined product metakaolin, Industrial Solid Waste such as flyash, height
Furnace slag, biomass ash etc. all can be used as the raw material of synthetically polymers, common such as (K) NaOH and (K) Na2SiO3Deng
It alkalizes in solution and the series of chemical such as polycondensation occurs to complete the preparation of ground polymers.
In recent years, numerous studies of the polymers concrete in ground due to its excellent performance by domestic and foreign scholars.It is prepared
Process is non-sintered, and low energy consumption, and three wastes discharge amount is reduced significantly, meets energy-saving and environment-friendly requirement, while can efficiently use Industrial Solid
It gives up and improves region environment, there is considerable economy and environmental effect.But relative to ordinary portland cement concrete,
The anti-carbonation properties of ground polymers concrete are undesirable[2-4], this can make the reduction of inside concrete alkalinity, and reinforcing bar loses the guarantor of passivating film
It protects and corrosion phenomenon occurs, not can guarantee the design strength of structure and combat a natural disaster performance.
Summary of the invention
The purpose of the present invention is overcoming deficiency in the prior art, a kind of high-strength high anti-carbonation properties of room temperature maintenance are provided
Ground polymers concrete and preparation method thereof, the present invention, for compound sa powder, and adds modified powder with flyash-slag
(calcined hydrotalcite) is made with the intensity and anti-carbonation properties of promotion ground polymers concrete, guaranteeing polymers concrete normal construction
With while, meet it in the requirement of the safety and endurance quality of building structure.
The technical scheme adopted by the invention is that: a kind of room temperature conserves the ground polymers concrete of high-strength high anti-carbonation properties,
Including compound sa powder, compound aqueous slkali, fine aggregate, coarse aggregate, modified powder and water-reducing agent.
Further, according to mass percent, the compound sa powder: the solid component in compound aqueous slkali: thin
Aggregate: coarse aggregate: modified powder: water-reducing agent=1.00:0.23~0.25:1.5~2.0:1.5~4.0:0.02~0.08:0~
0.05；The solid component and the compound sa powder in water constituent and the compound aqueous slkali in the compound aqueous slkali
The sum of ratio be 0.30~0.35.
Further, the compound sa powder includes flyash and blast-furnace cinder, according to mass percent, the powder
Coal ash: blast-furnace cinder=1:0.67~4.
Wherein, the flyash is level-one ash, and partial size is 0.1-100 μm；The blast-furnace cinder is S95 grades or S105 grades,
Partial size is 0.1-100 μm.
Further, the compound aqueous slkali includes silicate solutions, alkali solid particle and water；The compound aqueous slkali
Modulus be 1.2~1.5.
Wherein, the silicate solutions are liquid sodium silicate, liquid silicic acid potassium or liquid sodium silicate and liquid silicic acid potassium
Combination, the modulus of the silicate solutions are 1.2~3.0, solid content 40-60%；The alkali solid particle is solid hydrogen
The combination of sodium oxide molybdena, solid potassium hydroxide or solid sodium hydroxide and solid potassium hydroxide, the purity of the alkali solid particle
Greater than 96%.
Further, the modified powder is magnalium hydrotalcite, is obtained through 500-600 DEG C of calcining, and partial size is 0.1-100 μ
m。
Further, the fine aggregate and the coarse aggregate are aggregate for building；The fine aggregate is natural river sand, grain
Diameter is 0-5mm；The coarse aggregate size is 5-20mm.
Further, the water-reducing agent is liquid polycarboxylate water-reducer.
It is of the present invention another solution is that a kind of above-mentioned room temperature conserves the ground polymers of high-strength high anti-carbonation properties
The preparation method of concrete, comprising the following steps:
Step 1, compound aqueous slkali preparation: configuring alkali solid particle and water to form alkaline solution in proportion, then by than
Alkaline solution is uniformly mixed and is stood with silicate solutions by example；
Step 2, siccative mixes: in proportion mixing compound sa powder, modified powder, fine aggregate and coarse aggregate equal
It is even；
Step 3, prepared by ground polymers concrete: by compound aqueous slkali, compound sa powder, modified powder, fine aggregate, thick
Aggregate and water-reducing agent are uniformly mixed and stir；
Step 4, it forms: ground polymers concrete is fitted into mold simultaneously jolt ramming；
Step 5, conserve: demoulding after conserving 1 day under natural conditions is placed in sealed maintenance in fog room；
Step 6, strength test: measurement ground polymers concrete seven day, 14 days, 28 day age compression strength.
The beneficial effects of the present invention are:
The present invention solves the problems, such as well-known technique: since the activity of flyash is low, the hydraulicity is not present in itself,
Condensation hardening is slow after normal temperature condition reaction with aqueous slkali, intensity is lower, generally requires the curing condition in high temperature[5,6]Lower ability
More preferably mechanical property is obtained, which has limited the large-scale popularizations and application of flyash base polymers concrete.And for adopting
The alkali-activated slag concrete prepared with slag causes to prepare alkali-activated slag concrete and deposit since the CaO content of slag is higher
The disadvantages of in fast solidifying, working performance is poor, and volume contraction deformation is big, is also easy to produce crack[7].The present invention is by by flyash
It reacts with slag with a certain proportion of mixing, then with highly basic, realizing can prepare high-strengthly under room temperature curing condition
Polymers concrete is greatly expanded the application space of ground polymers concrete.
The present invention further promotes the compression strength of ground polymers concrete.Due to ground polymers concrete crushing strength and polymerization
The rate of reaction is related with ground polymers reaction product.Calcined hydrotalcite has catalytic action to polymerization reaction, can accelerate ground polymers
The synthesis rate and quantity of product, therefore the compression strength of ground polymers concrete can be further promoted, it is even up to high-strength.With
The ground polymers concrete for not adding calcined hydrotalcite is compared, when adding the ground polymers concrete curing 28d of calcined hydrotalcite, resistance to compression
Intensity is able to ascend 13%~21%.This make ground polymers concrete high building structure, long-span bridge girder construction and certain
It can be widely used in a little unique constructions.While guaranteeing Building Structural Safety energy, economic benefit is improved.
The present invention solves the problems, such as well-known technique: the anti-carbonation properties of ground polymers concrete compare normal silicate
For cement concrete it is weak very much, be not able to satisfy the life requirement that reinforcing bar uses for a long time in ground polymers concrete[2-4].Due to
The superiority and inferiority of ground polymers anti-carbonation properties depends primarily on the power and ground copolymer products and CO of matrix pore solution alkaline2Reaction
Degree.Hydrotalcite is able to ascend ground copolymer matrix pore solution alkalinity after calcining is added in the present invention, and can preferably inhale
It receives and fixes the CO penetrated into from ground polymer surface2.Pass through the calcined hydrotalcite of different addition quantity, it is possible to reduce ground polymers coagulation
The carbonation depth 31~95% of soil 28d age under the conditions of accelerated carbonation, effect is obvious, facilitates its pushing away in practical projects
Wide application.
Detailed description of the invention
Fig. 1: ground polymers mortar flash carbonization 28d carbonation depth compares:
Fig. 1 a: non-water mixing talcum carbonation depth 2.80mm；
Fig. 1 b: hydrotalcite carbonation depth 0.3mm is added.
Specific embodiment
In order to further understand the content, features and effects of the present invention, the following examples are hereby given, and cooperate attached drawing
Detailed description are as follows:
(1) raw material ratio and selection
A kind of room temperature conserves the ground polymers concrete of high-strength high anti-carbonation properties, by compound sa powder, compound alkali soluble
Liquid, fine aggregate, coarse aggregate, modified powder and water-reducing agent composition.
According to mass percent, the compound sa powder: solid component in compound aqueous slkali be (compound aqueous slkali
The sum of solid component in constituent alkali solid particle and silicate solutions): fine aggregate: coarse aggregate: modified powder: diminishing
Agent=1.00:0.23~0.25:1.5~2.0:1.5~4.0:0.02~0.08:0~0.05.Water-solid ratio is 0.30~0.35,
Wherein, (the constituent water and silicate of compound aqueous slkali are molten for the water constituent in the compound aqueous slkali for the water in water-solid ratio
The sum of water in liquid)；In water-solid ratio admittedly in the compound aqueous slkali solid component and the compound sa powder it
With.
The compound sa powder includes flyash and blast-furnace cinder, according to mass percent, the flyash: blast furnace
Slag=1:0.67~4.Wherein, the flyash is level-one ash, and partial size is 0.1-100 μm；The blast-furnace cinder be S95 grades or
S105 grades, partial size is 0.1-100 μm.
The compound aqueous slkali includes silicate solutions, alkali solid particle and water；The modulus of the compound aqueous slkali is
1.2~1.5, the sum of water in the water and the silicate solutions is the water constituent in the compound aqueous slkali, the alkalinity
The sum of solid component in solid particle and the silicate solutions is the solid component in the compound aqueous slkali.Wherein, institute
State the combination that silicate solutions are liquid sodium silicate, liquid silicic acid potassium or liquid sodium silicate and liquid silicic acid potassium, the silicate
The modulus of solution is 1.2~3.0, solid content 40-60%；The alkali solid particle is solid sodium hydroxide, solid hydrogen-oxygen
Change the combination of potassium or solid sodium hydroxide and solid potassium hydroxide, the alkali solid particle is to analyze pure or technical pure, effectively
Component content is greater than 96%；The water for forming the compound aqueous slkali is tap water.
The modified powder is magnalium hydrotalcite, is obtained through 500-600 DEG C of calcining, and partial size is 0.1-100 μm.
The fine aggregate and the coarse aggregate are aggregate for building；The fine aggregate is natural river sand (middle sand), partial size
For 0-5mm (not including 0mm)；The coarse aggregate size is 5-20mm.
The water-reducing agent is liquid polycarboxylate water-reducer.
(2) preparation of compound aqueous slkali
It is 1.2~1.5 that alkali solid particle and the obtained modulus of water are added into commercially available technical grade silicate solutions, before satisfaction
The compound aqueous slkali of the text water-solid ratio (0.3~0.35).Since there are highly exothermic and relatively strong for the preparation process of alkaline solution
Corrosivity preferably can directly buy the silicate solutions that modulus is 1.2~1.5, add certainly if the safety guaranteed in construction
Water-solid ratio range needed for water meets.
(3) processing temperature of modified powder (calcined hydrotalcite) is determined
Hydrotalcite is calcined in the case where being no more than 600 DEG C, can lose interlayer molecule and anion.If the temperature of calcining is too low,
The interlayer molecule and anion that part can only be lost, cause application effect bad.But (it is greater than 600 DEG C) when the temperature is excessively high,
The layer structure of hydrotalcite will be destroyed, and can not restore its original layer structure at this time.To reach optimum efficiency, therefore hydrotalcite
Calcination temperature should be at 500 DEG C~600 DEG C.
(4) prepared by polymers concrete
Step 1, compound aqueous slkali preparation: will mention in proportion the previous day configured alkaline solution (alkali solid particle and
Water) it is uniformly mixed with silicate solutions and stands 30min；
Step 2, siccative mixes: being in proportion uniformly mixed compound sa powder, modified powder, fine aggregate and coarse aggregate
3-5min；
Step 3, prepared by ground polymers concrete: by compound aqueous slkali, compound sa powder, modified powder, fine aggregate, thick
Aggregate and water-reducing agent are uniformly mixed and stir 3-5min；
Step 4, it forms: ground polymers concrete is fitted into mold simultaneously jolt ramming；
Step 5, it conserves: conserving demoulding after 1d under natural conditions, be placed in sealed maintenance in fog room；
Step 6, strength test: measurement ground polymers concrete seven d, 14d, 28d age compression strength.
(5) embodiment
With the comparing commonly polymers concrete and admixture calcined hydrotalcite pressure resistance of 7d, 14d, 28d of polymers concrete
Degree；Compare carbonation depth of two kinds of ground polymers mortars after flash carbonization tests 28d.(since aggregate only plays bone in concrete
Frame or filling effect, the anti-carbonation effect of polymers does not have an impact over the ground, therefore it is mixed ground polymers can be assessed with land used polymers mortar
Coagulate the anti-carbonation properties of soil.)
Experimental raw: I grade of flyash, blast-furnace cinder, calcined hydrotalcite (500 DEG C of high-temperature calcinations), NaOH particle, Na2SiO3
Solution (Ms=2.2, solid content 44.16%), river sand, stone, tap water.
1. material fiting ratio
A (is not spiked with calcined hydrotalcite)
Flyash: slag: sodium silicate solution: sodium hydrate particle: water: river sand: stone :=1:1:0.90:0.076:
0.36:3.4:5.1
B (adds calcined hydrotalcite)
Flyash: slag: sodium silicate solution: sodium hydrate particle: water: river sand: stone: calcined hydrotalcite=1:1:0.9:
0.076:0.36:3.4:5.1:0.06
2. polymers concrete crushing strength
(1) test block, every group of 9 test blocks are made according to match ratio shown in 1..The test block for pouring completion is placed in nature item
Demoulding after maintenance 1d under part.
(2) to regulation age, polymers concrete carries out cubic compressive strength test to sealed maintenance over the ground under standard curing.
Test result is as shown in table 1.
1 compressive strength test result (MPa) of table
The 28d compression strength of 2 test result of contrast table, B group ground polymers concrete improves about 21%, 7d pressure resistance compared with A group
Degree improves about 26% compared with A group.
The result shows that: the compression strength of the ground polymers concrete of calcined hydrotalcite is added better than commonly polymers concrete.
Novel ground of the invention polymers concrete can achieve the requirement of high-strength concrete.
3. polymers mortar resisting carbonization
A (is not spiked with calcined hydrotalcite)
Flyash: slag: sodium silicate solution: sodium hydrate particle: water: river sand=1:1:0.90:0.076:0.36:3.4
B (adds calcined hydrotalcite)
Flyash: slag: sodium silicate solution: sodium hydrate particle: water: river sand: calcined hydrotalcite=1:1:0.90:
0.076:0.36:3.4:0.06
(1) test block, every group of 9 test blocks are made according to match ratio.The test block for pouring completion is placed under natural conditions and is conserved
Demoulding after 1d.
(2) it is put into after conserving 28d in standard curing room and takes out after sealing test specimen with hermetic bag, predry under field conditions (factors)
Flash carbonization curing box (CO is put into after 2d2Concentration=1%, temperature: 20 DEG C, humidity: 65%).
(3) when flash carbonization tests 28d, test block is rived to from centre and is sprayed 1% phenolphthalein alcoholic solution, uses vernier
Calliper to measure polymers mortar section do not develop the color depth.
2 ground polymers mortar carbonation depth result (mm) of table
2 test result of contrast table, B group ground polymers mortar are not carbonized in flash carbonization 7d, 14d.In 28d
Carbonation depth improves about 89% compared with A group.After mixing calcined hydrotalcite, ground polymers mortar has high anti-carbonation properties, can satisfy
Ground polymers mortar prepares the durability use condition of poly- concrete as matrix.
Bibliography
[1]Davidovits J.Geopolymers:Inorganic Polymeric New Materials[J]
.Journal ofThermal Analysis&Calorimetry,1991,37(8):1633-1656.
[2]Pasupathy K,Berndt M,Sanjayan J,et al.Durability Performance of
Precast Fly Ash–Based Geopolymer Concrete under Atmospheric Exposure
Conditions[J].Journal of Materials in Civil Engineering,2018,30(3):04018007.
[3]Z.L I,S.L I.Carbonation resistance offly ash andblast furnace slag
based geopolymer concrete[J].Construction&Building Materials,2018,163:668-
680.
[4]Kirubajiny P,Marita B,Arnaud C,et al.Carbonation of a blended
slag-fly ash geopolymer concrete in field conditions after 8years[J]
.Construction&Building Materials,2016,125:661-669.
[5]Mehta A,Siddique R,Singh BP,Aggoun S, G,Barnat-Hunek
D.Influence of various parameters on strength and absorption properties of
fly ash based geopolymer concrete designedby Taguchi method.Construction
andBuilding Materials.2017；150:817-24.
[6]Noushini A,Babaee M,Castel A.Suitability of heat-cured low-calcium
fly ash-based geopolymer concrete for precast applications.Magazine of
Concrete Research.2016；68(4):163-77.
[7]Samson G,Cyr M,Gao XX.Formulation and characterization ofblended
alkali-activated materials based on flash-calcined metakaolin,fly ash and
GGBS.Construction and Building Materials.2017；144:50-64.
Although the preferred embodiment of the present invention is described above in conjunction with attached drawing, the invention is not limited to upper
The specific embodiment stated, the above mentioned embodiment is only schematical, be not it is restrictive, this field it is common
Technical staff under the inspiration of the present invention, without breaking away from the scope protected by the purposes and claims of the present invention, may be used also
By make it is many in the form of, within these are all belonged to the scope of protection of the present invention.
Claims (10)
1. the ground polymers concrete that a kind of room temperature conserves high-strength high anti-carbonation properties, which is characterized in that including compound sa powder
Material, compound aqueous slkali, fine aggregate, coarse aggregate, modified powder and water-reducing agent.
2. a kind of room temperature according to claim 1 conserves the ground polymers concrete of high-strength high anti-carbonation properties, feature exists
In the compound sa powder: the solid component in compound aqueous slkali: fine aggregate: coarse aggregate: changing according to mass percent
Property powder: water-reducing agent=1.00:0.23~0.25:1.5~2.0:1.5~4.0:0.02~0.08:0~0.05；It is described compound
The ratio of water constituent and solid component and the sum of the compound sa powder in the compound aqueous slkali in aqueous slkali is
0.30~0.35.
3. a kind of room temperature according to claim 1 conserves the ground polymers concrete of high-strength high anti-carbonation properties, feature exists
In, the compound sa powder includes flyash and blast-furnace cinder, according to mass percent, the flyash: blast-furnace cinder
=1:0.67~4.
4. a kind of room temperature according to claim 3 conserves the ground polymers concrete of high-strength high anti-carbonation properties, feature exists
In the flyash is level-one ash, and partial size is 0.1-100 μm；The blast-furnace cinder is S95 grades or S105 grades, partial size 0.1-
100μm。
5. a kind of room temperature according to claim 1 conserves the ground polymers concrete of high-strength high anti-carbonation properties, feature exists
In the compound aqueous slkali includes silicate solutions, alkali solid particle and water；The modulus of the compound aqueous slkali be 1.2~
1.5。
6. a kind of room temperature according to claim 5 conserves the ground polymers concrete of high-strength high anti-carbonation properties, feature exists
In the silicate solutions are the combination of liquid sodium silicate, liquid silicic acid potassium or liquid sodium silicate and liquid silicic acid potassium, the silicon
The modulus of acid salt solution is 1.2~3.0, solid content 40-60%；The alkali solid particle is solid sodium hydroxide, solid
The purity of the combination of potassium hydroxide or solid sodium hydroxide and solid potassium hydroxide, the alkali solid particle is greater than 96%.
7. a kind of room temperature according to claim 1 conserves the ground polymers concrete of high-strength high anti-carbonation properties, feature exists
In the modified powder is magnalium hydrotalcite, is obtained through 500-600 DEG C of calcining, and partial size is 0.1-100 μm.
8. a kind of room temperature according to claim 1 conserves the ground polymers concrete of high-strength high anti-carbonation properties, feature exists
In the fine aggregate and the coarse aggregate are aggregate for building；The fine aggregate is natural river sand, partial size 0-5mm；It is described
Coarse aggregate size is 5-20mm.
9. a kind of room temperature according to claim 1 conserves the ground polymers concrete of high-strength high anti-carbonation properties, feature exists
In the water-reducing agent is liquid polycarboxylate water-reducer.
10. the ground polymers concrete that a kind of described in any item room temperature of the claims 1 to 9 conserve high-strength high anti-carbonation properties
Preparation method, which comprises the following steps:
Step 1, compound aqueous slkali preparation: in proportion alkali solid particle and water are configured to form alkaline solution, then in proportion will
Alkaline solution is uniformly mixed and stands with silicate solutions；
Step 2, siccative mixes: being in proportion uniformly mixed compound sa powder, modified powder, fine aggregate and coarse aggregate；
Step 3, prepared by ground polymers concrete: by compound aqueous slkali, compound sa powder, modified powder, fine aggregate, coarse aggregate
It is uniformly mixed and stirs with water-reducing agent；
Step 4, it forms: ground polymers concrete is fitted into mold simultaneously jolt ramming；
Step 5, conserve: demoulding after conserving 1 day under natural conditions is placed in sealed maintenance in fog room；
Step 6, strength test: measurement ground polymers concrete seven day, 14 days, 28 day age compression strength.
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| CN111118490A (en) * | 2019-12-31 | 2020-05-08 | 浙江大学 | High-temperature-resistant high-adhesion geopolymer metal anti-corrosion coating and preparation method thereof |
| CN111620665A (en) * | 2020-06-18 | 2020-09-04 | 湘潭大学 | Low-shrinkage and carbonization-resistant steel slag geopolymer concrete |
| CN112979223A (en) * | 2021-02-08 | 2021-06-18 | 上海力阳道路加固科技股份有限公司 | Heat-conducting anti-cracking high-ductility geopolymer composite material and preparation method thereof |
| CN113248181A (en) * | 2021-06-26 | 2021-08-13 | 西安同成建筑科技有限责任公司 | High-performance anti-carbonization agent for concrete and preparation method thereof |
| CN115028400A (en) * | 2022-06-01 | 2022-09-09 | 杭州五友建材有限公司 | Recycled concrete and preparation method thereof |
| CN115924945A (en) * | 2022-11-18 | 2023-04-07 | 上海百奥恒新材料有限公司 | Calcined hydrotalcite and preparation method thereof, composition for preparing high-durability marine concrete, concrete and preparation method thereof |
| CN115974467A (en) * | 2022-12-30 | 2023-04-18 | 中铁二院工程集团有限责任公司 | Anti-ultraviolet anti-carbonization concrete and preparation method thereof |
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| CN111118490A (en) * | 2019-12-31 | 2020-05-08 | 浙江大学 | High-temperature-resistant high-adhesion geopolymer metal anti-corrosion coating and preparation method thereof |
| CN111620665A (en) * | 2020-06-18 | 2020-09-04 | 湘潭大学 | Low-shrinkage and carbonization-resistant steel slag geopolymer concrete |
| CN112979223A (en) * | 2021-02-08 | 2021-06-18 | 上海力阳道路加固科技股份有限公司 | Heat-conducting anti-cracking high-ductility geopolymer composite material and preparation method thereof |
| CN113248181A (en) * | 2021-06-26 | 2021-08-13 | 西安同成建筑科技有限责任公司 | High-performance anti-carbonization agent for concrete and preparation method thereof |
| CN115028400A (en) * | 2022-06-01 | 2022-09-09 | 杭州五友建材有限公司 | Recycled concrete and preparation method thereof |
| CN115924945A (en) * | 2022-11-18 | 2023-04-07 | 上海百奥恒新材料有限公司 | Calcined hydrotalcite and preparation method thereof, composition for preparing high-durability marine concrete, concrete and preparation method thereof |
| CN115974467A (en) * | 2022-12-30 | 2023-04-18 | 中铁二院工程集团有限责任公司 | Anti-ultraviolet anti-carbonization concrete and preparation method thereof |
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