CN113173757A - Low-temperature-resistant concrete and preparation method thereof - Google Patents

Low-temperature-resistant concrete and preparation method thereof Download PDF

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Publication number
CN113173757A
CN113173757A CN202110509592.XA CN202110509592A CN113173757A CN 113173757 A CN113173757 A CN 113173757A CN 202110509592 A CN202110509592 A CN 202110509592A CN 113173757 A CN113173757 A CN 113173757A
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concrete
parts
low
resistant concrete
water
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范良浩
张立红
王剑
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Ningbo Zhenhai Jinglian Concrete Co ltd
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Ningbo Zhenhai Jinglian Concrete Co ltd
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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
    • C04B28/02—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
    • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/40—Compounds containing silicon, titanium or zirconium or other organo-metallic compounds; Organo-clays; Organo-inorganic complexes
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The application relates to the technical field of concrete, and particularly discloses low-temperature-resistant concrete and a preparation method thereof. The low-temperature resistant concrete is prepared from the following raw materials in parts by weight: 350 parts of cement, 110 parts of water, 150 parts of fine aggregate, 500 parts of fine aggregate, 1080 parts of coarse aggregate, 20-30 parts of fly ash, 70-90 parts of mineral powder, 8-12 parts of pumping aid and 3-5 parts of polycarboxylic acid water reducer; the preparation method comprises the steps of adding the pumping aid and the polycarboxylic acid water reducing agent into water to prepare a mixed solution, adding the rest raw material components into the mixed solution, and uniformly stirring.

Description

Low-temperature-resistant concrete and preparation method thereof
Technical Field
The application relates to the technical field of concrete, in particular to low-temperature-resistant concrete and a preparation method thereof.
Background
In the chemical industry, some low-temperature alkane substances such as propane are stored for later use, and a storage tank required for storing the alkane substances needs to be constructed by concrete which is resistant to low temperature and has high strength. When ordinary concrete uses at low temperature, the surface freezes at first by the cold around the concrete, forms the frozen layer of sealing at the concrete surface, and the frozen volume of water on concrete surface layer expands, and the inside not frozen water of oppression concrete passes through the inside that capillary pipe impresses the saturation less, and along with the continuous increase of pressure, the capillary tensile stress in the set cement is bigger and bigger, when reaching the tensile strength limit, and the capillary in the concrete can take place to break, leads to the inside crackle that produces of concrete and receives the destruction.
The common related technology is that an air entraining agent is added when concrete is prepared, bubbles are introduced into a capillary tube of the concrete through the air entraining agent, and the small bubbles introduced by the air entraining agent cut off a path of the capillary tube, so that the capillary effect is reduced, and the impermeability of the concrete is improved. The micro closed bubbles can release the expansion pressure of ice crystals in the capillary during the freezing process, thereby avoiding generating destructive pressure, reducing the destructive effect of freeze thawing and improving the low temperature resistance of concrete.
With respect to the related art among the above, the inventors consider that the following drawbacks exist: after the air entraining agent is added into the concrete, a plurality of closed air bubbles are formed in the concrete, the air bubbles occupy a certain space in the concrete, the cross section of the concrete is reduced, the strength of the concrete is reduced, and the use of the concrete is limited to a certain extent.
Disclosure of Invention
In order to improve the low-temperature resistance of concrete and simultaneously not influence the strength of the concrete, the application provides the low-temperature resistant concrete and a preparation method thereof.
The application provides a low temperature resistant concrete and a preparation method thereof, which adopts the following technical scheme:
in a first aspect, the present application provides a low temperature resistant concrete, which adopts the following technical scheme:
the low-temperature-resistant concrete is prepared from the following raw materials in parts by weight: 350 parts of cement, 150 parts of water, 110 parts of fine aggregate, 540 parts of fine aggregate, 1000 parts of coarse aggregate, 1080 parts of fly ash, 70-90 parts of mineral powder, 8-12 parts of pumping aid and 3-5 parts of polycarboxylic acid water reducing agent.
By adopting the technical scheme, the compressive strength of the concrete can be improved by adding more coarse aggregates into the concrete, and the fine aggregates in the concrete can be filled in gaps of the coarse aggregates to ensure that the internal structure of the concrete is compact, so that the strength of the concrete is further improved; the hydration heat generated by water and cement reaction can be reduced by the fly ash and the mineral powder in the concrete, the possibility of cracks generated in the concrete due to the hydration heat is reduced, meanwhile, the water-cement ratio of the concrete, namely the weight ratio of the water to the cement, the fly ash and the mineral powder is smaller (less than 0.4), the smaller water-cement ratio ensures that the free water in capillary tubes in the concrete is less, when the free water on the surface of the concrete is cooled and expanded at low temperature, the tensile stress generated by the free water in the concrete is smaller, the internal structure of the concrete is not easy to damage, the low-temperature resistance of the concrete is effectively improved, and the strength of the concrete can be maintained; the pumping agent is added, so that the concrete can smoothly pass through the pipeline without segregation and blockage; the addition of the polycarboxylate superplasticizer can enable the concrete to have better workability, and the addition amount of water can be reduced, so that the free water in the concrete is reduced, and the low-temperature resistance of the concrete is enhanced.
Preferably, the water cement ratio of the low temperature resistant concrete is 0.35-0.42.
By adopting the technical scheme, when the water cement ratio of the concrete is 0.36-0.48, the concrete has better comprehensive performance; when the water cement ratio is lower than 0.36, the fluidity of the concrete is small, and the workability is poor, and when the water cement ratio is higher than 0.48, the fluidity of the concrete is large, and the segregation and bleeding are easy to occur, so that the strength of the concrete is influenced.
Preferably, the fine aggregate is medium sand, and the fineness modulus is 2.3-2.8.
Through adopting above-mentioned technical scheme, adopt the medium sand as fine aggregate, the medium sand is filled between the gap of coarse aggregate, reduces the porosity of concrete, can further promote the intensity of concrete.
Preferably, the coarse aggregate is broken stone, and the particle size of the broken stone is 5-25 mm.
By adopting the technical scheme, the concrete has better compressive strength due to the coarse aggregate with the crushed stone particle size of 5-25mm, and is more convenient to be matched with the fine aggregate to improve the strength of the concrete together.
Preferably, the low-temperature-resistant concrete further comprises a metal organic framework material MIL, and the weight ratio of the metal organic framework material MIL to the polycarboxylic acid water reducing agent is 1: 1-3.
By adopting the technical scheme, the metal organic framework material MIL is introduced into the concrete, the metal organic framework material MIL is a material with a multidimensional pore network structure formed by metal ions or metal ion clusters and organic compounds through coordination bonds, the metal organic framework material MIL can be adsorbed on the surface of cement particles, polycarboxylic acid water reducing agent molecules are attached to the surface of the cement particles, and carboxyl groups with negative charges on the metal organic framework material MIL can enhance the electronegativity of the surface of the cement particles, so that the electrostatic repulsive force among the cement particles is enhanced, the cement particles have better dispersibility, the mixing water usage amount of the concrete is reduced, free water in concrete capillary holes is reduced, the tensile stress in the capillary tubes in a low-temperature environment is reduced, and the low-temperature resistance of the concrete is improved; meanwhile, the metal organic framework material MIL can be dispersed into the capillary inside the concrete, when the frozen surface water of the concrete freezes and extrudes the free water inside the concrete, the free water can be extruded into the metal organic framework material MIL under the pressure, the tensile stress of the capillary is reduced, and the low-temperature resistance of the concrete is further improved.
Preferably, the particle size of the metal-organic framework material MIL is 10-50 μm.
By adopting the technical scheme, the metal organic framework material MIL with the grain diameter of 10-50 mu m can more effectively improve the workability and the low-temperature resistance of concrete.
Preferably, the particle size of the metal-organic framework material MIL is 10-30 μm.
By adopting the technical scheme, the metal organic framework material MIL with the grain diameter of 10-30 mu m can further improve the low temperature resistance of concrete. .
In a second aspect, the application provides a preparation method of low temperature resistant concrete, which adopts the following technical scheme:
a preparation method of low-temperature-resistant concrete comprises the following steps:
weighing the raw material components, adding the pumping aid and the polycarboxylic acid water reducing agent into water to prepare a mixed solution, adding the rest raw material components into the mixed solution, and uniformly stirring to obtain the low-temperature-resistant concrete.
By adopting the technical scheme, the pumping agent and the polycarboxylate superplasticizer are prepared into a mixed solution, so that the pumping agent and the polycarboxylate superplasticizer can play a greater role, and the workability of concrete in the mixing process is greater.
In summary, the present application has the following beneficial effects:
1. the compressive strength of the concrete can be improved by adding more coarse aggregates into the concrete, and the fine aggregates in the concrete can be filled in gaps of the coarse aggregates to enable the internal structure of the concrete to be compact, so that the strength of the concrete is further improved; the hydration heat generated by water and cement reaction can be reduced by the fly ash and the mineral powder in the concrete, the possibility of cracks generated in the concrete due to the hydration heat is reduced, meanwhile, the water-cement ratio of the concrete, namely the weight ratio of the water to the cement, the fly ash and the mineral powder is smaller (less than 0.4), the smaller water-cement ratio ensures that the free water in capillary tubes in the concrete is less, when the free water on the surface of the concrete is cooled and expanded at low temperature, the tensile stress generated by the free water in the concrete is smaller, the internal structure of the concrete is not easy to damage, the low-temperature resistance of the concrete is effectively improved, and the strength of the concrete can be maintained; the pumping agent is added, so that the concrete can smoothly pass through the pipeline without segregation and blockage; the addition of the polycarboxylate superplasticizer can enable the concrete to have better workability, and the addition amount of water can be reduced, so that the free water in the concrete is reduced, and the low-temperature resistance of the concrete is enhanced. .
2. Introducing a metal organic framework material MIL into concrete, wherein the metal organic framework material MIL is a material with a multidimensional pore network structure formed by metal ions or metal ion clusters and organic compounds through coordination bonds, the metal organic framework material MIL can be adsorbed on the surface of cement particles, polycarboxylic acid water reducing agent molecules are attached to the surface of the cement particles, and carboxyl groups with negative charges on the metal organic framework material MIL can enhance the electronegativity of the surface of the cement particles, so that the electrostatic repulsion force among the cement particles is enhanced, the cement particles have better dispersibility, the mixing water usage amount of the concrete is reduced, free water in concrete capillary holes is reduced, the tensile stress in the capillary tubes in a low-temperature environment is reduced, and the low-temperature resistance of the concrete is improved; meanwhile, the metal organic framework material MIL can be dispersed into the capillary inside the concrete, when the frozen surface water of the concrete freezes and extrudes the free water inside the concrete, the free water can be extruded into the metal organic framework material MIL under the pressure, the tensile stress of the capillary is reduced, and the low-temperature resistance of the concrete is further improved.
Detailed Description
At present, the commonly used antifreeze concrete is prepared by adding an air entraining agent into a concrete mixing raw material, wherein the air entraining agent introduces air bubbles into the concrete, and the introduced air bubbles are utilized to reduce the tensile stress generated by freezing internal capillary tubes of the concrete at low temperature, but the use of the inducer can reduce the strength of the concrete; the inventor discovers in research that the frost resistance of concrete can be improved by adjusting the proportion of mixing water in the concrete, and meanwhile, the metal organic framework material MIL can further improve the frost resistance of the concrete and does not influence the strength of the concrete.
The present application will be described in further detail with reference to examples.
The raw materials used in the application are all commercial products, and the type of the cement is P.042.5; the water is tap water; the fly ash is second-grade fly ash; the mineral powder is S95 grade mineral powder; the pumping agent is in the type of Point-400H; the model of the polycarboxylic acid water reducing agent is ZY 8020; the metal organic framework material MIL is MIL-101(Cr), the coordination metal is Cr, and the ligand is terephthalic acid.
Examples
Examples 1 to 3
The fine aggregate used in examples 1 to 3 was medium sand, and the fineness modulus was 2.3 to 2.8; the coarse aggregate used in examples 1 to 3 was crushed stone having a particle size of 5 to 25 mm.
In the following, taking example 1 as an example, the preparation method of the low temperature resistant concrete comprises the following steps:
weighing the raw material components, adding the pumping aid and the polycarboxylic acid water reducing agent into water to prepare a mixed solution, adding the rest raw material components into the mixed solution, and uniformly stirring to obtain the low-temperature-resistant concrete.
Table 1 shows the raw material components of the low temperature resistant concrete of each example.
TABLE 1
Figure BDA0003059782850000041
Examples 4 to 6
As shown in Table 2, examples 4 to 6 are different from example 2 in the water cement ratio (water/cement ratio) of the raw material components, and examples 4 to 6 were prepared in the same manner as example 2.
Table 2 shows the raw material components of the low temperature resistant concrete of each example.
TABLE 2
Figure BDA0003059782850000051
Examples 7 to 9
As shown in table 3, compared with example 5, example 7 is mainly different in that medium sand in the raw material composition is replaced with fine sand, example 8 is mainly different in that medium sand in the raw material composition is replaced with coarse sand, and example 9 is mainly different in that crushed stone in the raw material composition is replaced with crushed stone having a particle size of 25 to 31 mm. The preparation of examples 7 to 9 was carried out in the same manner as in example 5.
Table 3 shows the raw material components of the low temperature resistant concrete of each example.
TABLE 3
Figure BDA0003059782850000052
Figure BDA0003059782850000061
Examples 10 to 15
As shown in Table 4, examples 10 to 12 are mainly different from example 5 in that a metal-organic framework material MIL having a particle size of 50 μm is added to the raw material components, and the weight ratio of the metal-organic framework material MIL to the polycarboxylic acid water-reducing agent is 1:1 to 3. The preparation methods of examples 10 to 12 are different from those of example 5 in that the respective metal-organic framework material MIL is weighed in a weight ratio and added to the mixed solution when the raw material components are weighed.
The main difference between examples 13 to 15 compared with example 11 is the particle size of the metal-organic framework material MIL in the starting components. Examples 13-15 were prepared in the same manner as example 11.
Table 4 shows the raw material components of the low temperature resistant concrete of each example.
TABLE 4
Figure BDA0003059782850000062
Figure BDA0003059782850000071
Comparative example
Comparative example 1
Comparative example 1 is different from example 1 in that 3Kg of an air-entraining agent was added to the raw material components. The preparation method of comparative example 1 is different from that of example 1 in that the air entraining agent is weighed when the raw material components are weighed and added to the mixed solution to prepare the anti-freeze concrete.
Performance test
Test method
The concrete is cooled from normal temperature to-60 ℃ and then returned to the normal temperature:
the concrete test pieces are cubes, the sizes of the concrete test pieces are 100mm multiplied by 100mm, and the average number is taken after the test of each group of 9 test pieces is finished; and placing the test piece in a low-temperature box, reducing the temperature to-60 ℃ at the cooling rate of 1 ℃/min, keeping the temperature constant for 60 minutes, taking out the test piece, wrapping the test piece by using a plastic film to the normal temperature for 48 hours, then carrying out a loading test by using the batch of test pieces, uniformly loading the test piece to be damaged by using a universal testing machine at the loading speed of 0.5MPa/s, and recording the maximum load value during the damage.
The compressive strength test of the concrete after 20 times of freeze-thaw cycle between 5 ℃ and-5 ℃ is as follows:
the concrete test pieces are cubes, the sizes of the concrete test pieces are 100mm multiplied by 100mm, and the average number is taken after the test of each group of 9 test pieces is finished; placing the test piece in a low-temperature box, reducing the temperature from room temperature to 5 ℃ at the cooling rate of 1 ℃/h, performing 20 freeze-thaw cycles at the heating rate of 1 ℃/h between 5 ℃ and-5 ℃, and then heating to the normal temperature; and then the batch of test pieces are used for carrying out loading test, a universal testing machine is used for uniformly loading the test pieces to be damaged at the loading speed of 0.5MPa/s, and the maximum load value during the damage is recorded.
Coefficient of thermal expansion test of concrete
The test pieces are prismatic bodies, the size of each test piece is 100mm multiplied by 300mm, and the average number is taken after the test of each group of 12 test pieces is finished; and (2) placing the test piece in a low-temperature box, reducing the temperature to-60 ℃ at a cooling rate of 1 ℃/min, keeping the temperature constant after the temperature reaches-60 ℃, keeping the constant temperature fluctuation range within +/-0.2 ℃, keeping the total low-temperature action time of 48h, recording the deformation value of the test piece under the action working condition of the specified temperature, and calculating the expansion deformation coefficient of the test piece under the low-temperature action according to the size of the test piece before the low-temperature action and the deformation value recorded under the action working condition of the specified temperature.
The results of the above test data are shown in table 5.
TABLE 5
Figure BDA0003059782850000081
As can be seen from the combination of examples 1 to 3 and Table 5, the difference between the compressive strength of examples 1 to 3 after cooling to-60 ℃ and the compressive strength after 20 cycles of freeze-thaw was not large, and the coefficient of thermal expansion was not significantly changed. It can be seen from the combination of example 2 and examples 4-6 that the compressive strength of example 5 returning to room temperature after being cooled to-60 ℃ is the highest, and the compressive strength of example 5 after being subjected to freeze-thaw cycling for 20 times is the lowest, and the thermal expansion coefficient of the concrete is the lowest, which indicates that the low temperature resistance of the concrete can be improved by adjusting the water-cement ratio of the concrete, and the extrusion force of the ice layer on the surface of the concrete on the free water in the capillary tube to the inside is also reduced due to the reduction of the free water in the capillary hole in the concrete, so that the low temperature resistance of the concrete is improved. Combining the example 5 and the examples 7 to 9, it can be seen that when the medium sand in the concrete is changed into fine sand or coarse sand, the low temperature resistance of the concrete is reduced, because the fine sand reduces the strength of the concrete, the strength of the concrete is reduced at low temperature, the matching between the coarse sand and the broken stone is poor, more capillary pipelines are easily formed in the concrete, the tensile stress generated by the capillary in the concrete is increased, and the low temperature resistance of the concrete is reduced; when the particle size of the broken stone in the concrete is replaced by 25-31mm from 5-25mm, the low temperature resistance of the concrete is correspondingly reduced, because the particle size of the coarse aggregate is increased, more capillaries are formed when the coarse aggregate and the fine aggregate are matched, the tensile stress generated by the capillaries in the concrete is increased, and the low temperature resistance of the concrete is reduced.
It can be seen from the combination of example 5 and examples 10-12 that the overall performance of examples 10-12 is higher than that of example 5, which shows that the addition of the metal-organic framework material MIL to the concrete can increase the low temperature resistance of the concrete, because the metal-organic framework material MIL is a material having a multidimensional pore network structure formed by metal ions or metal ion clusters and organic compounds through coordination bonds, the metal-organic framework material MIL can be adsorbed on the surfaces of cement particles, polycarboxylic acid water reducing agent molecules are attached to the surfaces of the cement particles, the negatively charged carboxyl groups on the metal-organic framework material MIL can enhance the electronegativity of the surfaces of the cement particles, further enhance the electrostatic repulsion force between the cement particles, make the cement particles have better dispersibility, reduce the mixing water usage amount of the concrete, and further reduce the free water in the capillary pores of the concrete, the tensile stress in the capillary in the low-temperature environment is reduced, and the low-temperature resistance of the concrete is improved; meanwhile, the metal organic framework material MIL can be dispersed into the capillary inside the concrete, when the frozen surface water of the concrete freezes and extrudes the free water inside the concrete, the free water can be extruded into the metal organic framework material MIL under the pressure, the tensile stress of the capillary is reduced, and the low-temperature resistance of the concrete is further improved. Combining example 11 with examples 13-15, it can be seen that varying the particle size of the MILs can alter the low temperature resistance of the concrete, with the best overall performance of MILs having a particle size of 20 μm.
It can be seen from the combination of example 1 and comparative example 1 that the addition of the air-entraining agent reduces the strength of the concrete but the coefficient of thermal expansion thereof is reduced, which indicates that the addition of the air-entraining agent can improve the low temperature resistance of the concrete but the strength thereof is reduced because air bubbles are introduced into the concrete after the addition of the air-entraining agent, and the strength of the concrete is reduced by the air bubbles in the concrete.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.

Claims (8)

1. The low-temperature-resistant concrete is characterized by being prepared from the following raw materials in parts by weight: 350 parts of cement, 150 parts of water, 110 parts of fine aggregate, 540 parts of fine aggregate, 1000 parts of coarse aggregate, 1080 parts of fly ash, 70-90 parts of mineral powder, 8-12 parts of pumping aid and 3-5 parts of polycarboxylic acid water reducing agent.
2. The low temperature resistant concrete according to claim 1, wherein: the water cement ratio of the low-temperature resistant concrete is 0.35-0.42.
3. The low temperature resistant concrete according to claim 1 or 2, wherein: the fine aggregate is medium sand, and the fineness modulus is 2.3-2.8.
4. The low temperature resistant concrete according to claim 3, wherein: the coarse aggregate is broken stone, and the particle size of the broken stone is 5-25 mm.
5. The low temperature resistant concrete according to claim 4, wherein: the low-temperature-resistant concrete further comprises a metal organic framework material MIL, and the weight ratio of the metal organic framework material MIL to the polycarboxylic acid water reducing agent is 1: 1-3.
6. The low temperature resistant concrete according to claim 5, wherein: the particle size of the metal organic framework material MIL is 10-50 mu m.
7. The low temperature resistant concrete according to claim 6, wherein: the particle size of the metal organic framework material MIL is 10-30 mu m.
8. The method for preparing the low temperature resistant concrete according to any one of claims 1 to 7, characterized by comprising the steps of:
weighing the raw material components, adding the pumping aid and the polycarboxylic acid water reducing agent into water to prepare a mixed solution, adding the rest raw material components into the mixed solution, and uniformly stirring to obtain the low-temperature-resistant concrete.
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CN108383446A (en) * 2018-03-15 2018-08-10 山东大学 A kind of Ultrastrength cement base repair materials that metal-organic framework materials are modified
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Publication number Priority date Publication date Assignee Title
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CN106915934A (en) * 2015-12-25 2017-07-04 天津市泽元混凝土有限公司 A kind of impervious frost thawing resistance concrete mix and its blending method
CN108383446A (en) * 2018-03-15 2018-08-10 山东大学 A kind of Ultrastrength cement base repair materials that metal-organic framework materials are modified
CN111484293A (en) * 2020-04-26 2020-08-04 上海兆捷实业发展有限公司 Anti-freezing high-performance concrete and preparation method thereof

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Application publication date: 20210727

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