CN115849820A - High-strength concrete and preparation process thereof - Google Patents
High-strength concrete and preparation process thereof Download PDFInfo
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- CN115849820A CN115849820A CN202211581670.8A CN202211581670A CN115849820A CN 115849820 A CN115849820 A CN 115849820A CN 202211581670 A CN202211581670 A CN 202211581670A CN 115849820 A CN115849820 A CN 115849820A
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- 239000011372 high-strength concrete Substances 0.000 title claims abstract description 80
- 238000002360 preparation method Methods 0.000 title abstract description 9
- 229920005989 resin Polymers 0.000 claims abstract description 106
- 239000011347 resin Substances 0.000 claims abstract description 106
- 239000002245 particle Substances 0.000 claims abstract description 102
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000000463 material Substances 0.000 claims abstract description 25
- 239000004575 stone Substances 0.000 claims abstract description 22
- 238000003756 stirring Methods 0.000 claims abstract description 18
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 15
- 239000004576 sand Substances 0.000 claims abstract description 15
- 239000004568 cement Substances 0.000 claims abstract description 14
- 239000010881 fly ash Substances 0.000 claims abstract description 13
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 10
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 10
- 239000004593 Epoxy Substances 0.000 claims description 8
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 claims description 8
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims description 8
- 229920002554 vinyl polymer Polymers 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 239000004697 Polyetherimide Substances 0.000 claims description 6
- 229920001601 polyetherimide Polymers 0.000 claims description 6
- 239000000243 solution Substances 0.000 claims description 6
- 239000007864 aqueous solution Substances 0.000 claims description 5
- 229920006122 polyamide resin Polymers 0.000 claims description 4
- 239000004567 concrete Substances 0.000 abstract description 33
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 13
- 230000000694 effects Effects 0.000 description 8
- 239000000203 mixture Substances 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 239000002994 raw material Substances 0.000 description 6
- 239000008187 granular material Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000007858 starting material Substances 0.000 description 3
- 238000007906 compression Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000011178 precast concrete Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The application relates to the field of concrete, and particularly discloses high-strength concrete and a preparation process thereof. The high-strength concrete comprises the following components in parts by weight: 460 to 500 parts of cement, 60 to 70 parts of fly ash, 600 to 660 parts of sand, 700 to 800 parts of stone, 10 to 15 parts of water reducing agent, 100 to 150 parts of water and 320 to 480 parts of resin particles, wherein the tensile strength of the resin particles is not lower than 80 MPa; the preparation method comprises the following steps: mixing cement, fly ash, sand and stone, and uniformly stirring to obtain a dry stirring material; adding a water reducing agent and water into the dry-mixed material, and uniformly stirring and mixing to obtain a wet-mixed material; and adding the resin particles into the wet-mixed material, and uniformly stirring and mixing to obtain the high-strength concrete. The high-strength concrete has high compressive strength, small density and light dead weight, and is convenient to transport when applied to concrete prefabricated parts.
Description
Technical Field
The application relates to the field of concrete, in particular to high-strength concrete and a preparation process thereof.
Background
High strength concrete refers to concrete with strength grade of C60 and above, and is mainly measured by compressive strength. The high-strength concrete is produced by using cement, sand and stone as raw materials and adding water reducing agent or adding mixture of fly ash, slag, silica powder and the like at the same time through a conventional process. The high-strength concrete is used as a new building material, has the advantages of high compressive strength, strong deformation resistance, large density and low porosity, and is widely applied to high-rise building structures, large-span bridge structures and certain special structures, wherein the compressive strength of the high-strength concrete is 4-6 times that of common-strength concrete.
In some building engineering built by prefabricated parts, such as bridge engineering and the like, the prefabricated parts are often required to be transported, the weight ratio of sand and stone with higher density in the high-strength concrete is very high, generally 70-80%, so that the density and the self weight of the high-strength concrete are both high, the transportation difficulty is high, and if the weight ratio of the sand and the stone is reduced, the compressive strength of the concrete is reduced. Therefore, it is a problem in the art how to make high-strength concrete having a lower self-weight while maintaining high compressive strength.
Disclosure of Invention
In order to solve the problem that the self density of high-strength concrete is difficult to balance while the high compressive strength of the high-strength concrete is kept, the application provides the high-strength concrete and a preparation process thereof.
In a first aspect, the present application provides a high-strength concrete, which adopts the following technical scheme:
the high-strength concrete comprises the following components in parts by weight: 460-500 parts of cement, 60-70 parts of fly ash, 600-660 parts of sand, 700-800 parts of stone, 10-15 parts of water reducing agent, 100-150 parts of water and 320-480 parts of resin particles, wherein the tensile strength of the resin particles is not lower than 80MPa.
By adopting the technical scheme, the resin particles with lower density are adopted to replace part of stones, the formed high-strength concrete has smaller weight and density under the same volume, and the tensile strength of the resin particles is not lower than 80MPa, so that the high-strength concrete can have good compressive strength; this application high-strength concrete not only has excellent compressive strength, accords with the standard requirement, and density is little, and the dead weight is light, can be applied to the precast concrete field well to the resin granule is compared and is had certain toughness in stone, makes high-strength concrete can play certain cushioning effect when the atress, has improved high-strength concrete's self-protection ability, has prolonged life.
Through tests, the resin particles are irregularly dispersed in a concrete system, the stress of the resin particles comprises shearing force, compression force, twisting force and pulling force generated by deformation of the concrete system when the resin particles are applied, and the volume of a single resin particle accounts for a very small proportion in the concrete system, so that the tensile strength with the lowest value in the strength performance of the resin particles can be taken as the reference strength to meet the requirement of the concrete on the compressive strength.
Preferably, the weight ratio of the resin particles is 14 to 18%.
Tests prove that when the weight ratio of the resin particles is controlled within the range, the compressive property of the prepared high-strength concrete is better, when the weight ratio of the resin particles is lower than 14%, the compressive property of the prepared high-strength concrete is reduced, mainly because the strength of the resin particles is superior to that of pure concrete, the reduction of the resin particles can influence the compressive strength of the high-strength concrete after solidification, when the weight ratio of the resin particles exceeds 18%, the resin particles are more densely dispersed in a concrete system after solidification of the concrete, other materials of a concrete system are less distributed among the resin particles, and the compressive property of the high-strength concrete can be influenced.
Preferably, the resin particles are spherical.
Tests prove that the spherical resin particles are beneficial to uniform dispersion of the resin particles in a concrete system, and the spherical resin particles are in the same form when dispersed in the concrete system, so that the scattering condition that the resin particles are different in shape and different in orientation does not exist, and the compressive strength of the solidified high-strength concrete is more balanced.
Preferably, the particle diameter of the resin particle is 0.5 to 1cm.
Tests prove that when the particle size of the resin particles is smaller than 0.5cm, the compressive strength of the prepared high-strength concrete can be reduced, mainly because the particle size of the resin particles is too small, the bearing effect in a concrete system is reduced during application, bearing force is concentrated on other system materials of the concrete, when the particle size of the resin particles is larger than 1cm, the resin particles are dispersed sparsely in the concrete system, and the compressive strength of the prepared high-strength concrete can be reduced.
Preferably, the resin particles are one or a combination of bisphenol A epoxy vinyl resin, polyetherimide resin and polyamide resin.
Preferably, the resin particles are bisphenol a type epoxy vinyl resin.
By adopting the technical scheme, the bisphenol A type epoxy vinyl resin has good performance, low price and low density, and is more suitable for concrete production in comprehensive consideration.
Preferably, the components also comprise 30-40 parts of polyvinyl alcohol aqueous solution.
By adopting the technical scheme, the polyvinyl alcohol aqueous solution can improve the bonding effect of the resin particles with other materials in a concrete system, improve the tightness of the system and is beneficial to improving the compressive strength of the prepared high-strength concrete.
In a second aspect, the present application provides a preparation process of a high-strength concrete, which adopts the following technical scheme:
a preparation process of high-strength concrete comprises the following steps:
s1: mixing cement, fly ash, sand and stone, and uniformly stirring to obtain a dry stirring material;
s2: adding a water reducing agent and water into the dry-mixed material, and uniformly stirring and mixing to obtain a wet-mixed material;
s3: and adding resin particles into the wet-mixed material, and uniformly stirring and mixing to obtain the high-strength concrete.
By adopting the technical scheme, the process is simple, the implementation difficulty is low, the mass production is convenient, the prepared high-strength concrete has good compressive strength and light dead weight, and the transportation is convenient.
Preferably, in step S3, 30 to 40 parts by weight of an aqueous polyvinyl alcohol solution is added together with the resin particles.
By adopting the technical scheme, the adhesive effect between the resin particles and other raw materials of the system is favorably improved.
Preferably, the surface of the resin particle is sanded.
By adopting the technical scheme, the contact area between the resin particles and other raw materials of the system is increased, the bonding effect between the resin particles and other raw materials of the system is favorably improved, and the connection strength between the resin particles and other materials of the system is higher after the high-strength concrete is solidified.
In summary, the present application includes at least one of the following beneficial technical effects:
1. because this application adopts the resin granule that density is lower to replace partial stone, the lower weight and density of fashioned high-strength concrete under the same volume, and the tensile strength of control resin granule is not less than 80MPa, consequently can guarantee simultaneously that high-strength concrete has good compressive strength, the high-strength concrete that makes not only has excellent compressive strength, and density is little, the dead weight is light, can be applied to the precast concrete field well, and resin granule has certain toughness compared with the stone, make high-strength concrete can play certain cushioning effect when the atress, the self-protection ability of high-strength concrete has been improved, service life has been prolonged.
2. The method has the advantages of simple process, low implementation difficulty, convenience for mass production, good compression strength of the prepared high-strength concrete, light dead weight and convenience for transportation.
Detailed Description
In order to facilitate understanding of the technical solutions of the present application, the following detailed descriptions are made in conjunction with tables and examples, but are not intended to limit the scope of the present application.
In the following examples and comparative examples, the weight of each 1 part by weight of the material was 0.1kg, limestone was used as the stone, P.O 52.5.5 as the cement, and a polycarboxylic acid water reducing agent was used as the water reducing agent.
Example 1
According to parts by weight, 460 parts of cement, 60 parts of fly ash, 600 parts of sand, 700 parts of stone, 10 parts of water reducing agent, 100 parts of water and 480 parts of resin particles are taken, wherein the resin particles are bisphenol A type epoxy vinyl resin (the model is Atlac 430, the tensile strength is 86MPa, the particle size D90 is 0.8cm, and the density is 1.18g/cm 3 )。
The preparation process comprises the following steps:
s1: mixing cement, fly ash, sand and stone, and uniformly stirring to obtain a dry stirring material;
s2: adding a water reducing agent and water into the dry-mixed material, and uniformly stirring and mixing to obtain a wet-mixed material;
s3: and adding resin particles into the wet-mixed material, and uniformly stirring and mixing to obtain the mortar-like high-strength concrete.
Example 2
The difference from the embodiment 1 is that the mixture ratio of each component is as follows: 470 parts of cement, 63 parts of fly ash, 620 parts of sand, 730 parts of stone, 12 parts of water reducing agent, 120 parts of water and 440 parts of resin particles.
Example 3
The difference from the embodiment 1 is that the mixture ratio of each component is as follows: 480 parts of cement, 65 parts of fly ash, 630 parts of sand, 750 parts of stone, 13 parts of water reducing agent, 130 parts of water and 400 parts of resin particles.
Example 4
The difference from the embodiment 1 is that the mixture ratio of each component is as follows: 490 parts of cement, 68 parts of fly ash, 650 parts of sand, 780 parts of stone, 14 parts of water reducing agent, 140 parts of water and 360 parts of resin particles.
Example 5
The difference from the embodiment 1 is that the mixture ratio of each component is as follows: 500 parts of cement, 70 parts of fly ash, 660 parts of sand, 800 parts of stone, 15 parts of water reducing agent, 150 parts of water and 320 parts of resin particles.
Comparative example 1
The difference from example 1 is that the resin particles were replaced with an equal amount of stone.
Table 1: the proportions of the components in examples 1-5 and comparative example 1.
Performance test
The mortar-shaped high-strength concrete prepared in the embodiments 1 to 5 and the comparative example 1 is cast into a prefabricated member in a gathering manner according to the practical application in a mold, the compressive strength of the concrete prefabricated member is generally detected for 7 days in the industry, the compressive strength is detected according to the standard JGJ/T294-2013, and the detection data are shown in Table 2.
Table 2: 7-day compressive strength data for high strength concrete preforms in examples 1-5, comparative example 1.
It can be seen from the data of examples 1 to 5 and table 2 that the high-strength concrete prepared by the formulation of the present application has excellent compressive strength and can completely meet the industrial requirements, and the density of the resin particles used is lower than that of the stone, so that the prepared high-strength concrete has lighter self weight while maintaining good compressive strength, and the high-strength concrete prepared by the formulation of example 3 has better compressive strength.
And as can be seen from the data in table 2, when the weight ratio of the resin particles is between 14% and 18%, the compressive strength of the prepared high-strength concrete is better. When the weight ratio of the resin particles is lower than 14% or higher than 18%, the compressive strength of the prepared high-strength concrete is obviously reduced, because the strength of the resin particles is superior to that of the concrete without the resin particles, the reduction of the resin particles can influence the compressive strength of the high-strength concrete, and the excessive resin particles can lead to the denser dispersion of the resin particles in a concrete system after the concrete is solidified, so that other materials in the concrete system are less distributed among the resin particles, the connection strength is reduced, and the compressive performance of the high-strength concrete is influenced. Therefore, the compressive strength of the prepared strong concrete is better when the weight ratio of the resin particles is controlled between 14% and 18%.
Combining the data of example 1, comparative example 1 and table 2, it can be seen that the compressive strength of the high-strength concrete prepared without adding the resin particles is lower than that of the high-strength concrete prepared in the present application, and it can be seen that the addition of the resin particles not only can reduce the self weight of the concrete, but also can improve the compressive strength of the concrete.
Example 6
The difference from example 3 is that the particle diameter D90 of the resin particles was 0.5cm.
Example 7
The difference from example 3 is that the particle diameter D90 of the resin particles was 1cm.
Example 8
The difference from example 3 is that the particle diameter D90 of the resin particles was 0.3cm.
Example 9
The difference from example 3 is that the particle diameter D90 of the resin particles was 1.2cm.
The compressive strength of the high-strength concrete in examples 6 to 9 was measured for 7 days in the same manner as above, and the measurement data are shown in Table 3.
Table 3: examples 3, 6-9 data on the 7-day compressive strength of the high strength concrete preforms.
It can be seen from the data of examples 3, 6 to 9 and Table 2 that the compressive strength of the high-strength concrete obtained by controlling the particle size of the resin particles to 0.5 to 1.0cm is better. When the particle size of the resin particles is less than 0.5cm, the compressive strength of the prepared high-strength concrete can be reduced because the particle size of the resin particles is too small, the bearing effect in a concrete system is reduced during application, bearing force is concentrated on other system materials of the concrete, and the compressive strength is influenced, and when the particle size of the resin particles is more than 1cm, the resin particles are dispersed in the concrete system more sparsely, and the compressive strength of the prepared high-strength concrete can be reduced. Therefore, the particle diameter of the resin particles is preferably controlled to 0.5 to 1.0 cm.
Example 10
The difference from example 3 is that polyetherimide resin (type YT-3201, tensile strength of 110MPa, density of 1.27 g/cm) is used as the resin particles 3 )。
Example 11
The difference from example 3 is that the resin pellets used were polyamide resin (type 101L, tensile strength 82MPa, density 1.14 g/cm) 3 )。
Example 12
The difference from example 3 is that 35 parts of an aqueous polyvinyl alcohol solution (12% concentration) was further added to the starting material.
Example 13
The difference from example 1 is that 40 parts of an aqueous polyvinyl alcohol solution (12% concentration) was added to the starting material.
Example 14
The difference from example 5 is that 30 parts of an aqueous polyvinyl alcohol solution (12% concentration) was added to the starting material.
Example 15
The difference from example 12 is that the surface of the resin particle was sanded.
The compressive strength of the high-strength concrete in examples 10 to 15 was measured for 7 days in the same manner as above, and the measurement data are shown in Table 4.
Table 4: 7-day compressive strength data for high strength concrete preforms in examples 10-15.
It can be seen from the data of examples 3, 10, 11 and table 4 that the compressive strength of the high strength concrete is improved by using bisphenol a type epoxy vinyl resin, polyetherimide resin and polyamide resin, wherein the polyetherimide resin is more effective in improving the compressive strength of the high strength concrete, but the polyetherimide resin is more expensive and is not much higher than the bisphenol a type epoxy vinyl resin, so the selection of bisphenol a type epoxy vinyl resin as the resin particles is more preferable in view of the comprehensive production cost.
It can be seen from the data of examples 1, 3, 5, 12 to 14 and table 4 that the addition of the aqueous solution of polyvinyl alcohol in the system improves the compressive strength of the high-strength concrete because the aqueous solution of polyvinyl alcohol has an adhesive effect, which can improve the adhesive effect of the resin particles with other materials in the concrete system, and improve the tightness of the system, thereby improving the compressive strength of the high-strength concrete.
It can be seen from the data in examples 12 and 15 and table 4 that the compressive strength of the high-strength concrete prepared by performing the sanding treatment on the surface of the resin particles is improved because the contact area between the resin particles after the surface sanding treatment and other raw materials of the system is increased, the adhesion effect between the resin particles and other raw materials of the system is improved, and the connection strength between the resin particles and other materials of the system after the high-strength concrete is solidified is higher.
To sum up, the high-strength concrete that this application was made has excellent compressive strength, and the dead weight is lighter, has compromise high compressive strength and the low density of high-strength concrete, has good application prospect.
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 (9)
1. The high-strength concrete is characterized by comprising the following components in parts by weight: 460 to 500 parts of cement, 60 to 70 parts of fly ash, 600 to 660 parts of sand, 700 to 800 parts of stone, 10 to 15 parts of water reducing agent, 100 to 150 parts of water and 320 to 480 parts of resin particles, wherein the tensile strength of the resin particles is not lower than 80MPa.
2. The high strength concrete according to claim 1, wherein: the weight ratio of the resin particles is 14-18%.
3. The high strength concrete according to claim 1, wherein: the resin particles are spherical.
4. A high strength concrete according to claim 3, wherein: the particle size of the resin particles is 0.5-1 cm.
5. The high strength concrete according to claim 1, wherein: the resin particles are one or a combination of more of bisphenol A type epoxy vinyl resin, polyetherimide resin and polyamide resin.
6. The high strength concrete of any one of claims 1~5 wherein: the components also comprise 30 to 40 parts of polyvinyl alcohol aqueous solution.
7. The process for preparing high strength concrete according to any one of claims 1~5 comprising the steps of:
s1: mixing cement, fly ash, sand and stone, and uniformly stirring to obtain a dry stirring material;
s2: adding a water reducing agent and water into the dry stirring material, and uniformly stirring and mixing to obtain a wet stirring material;
s3: and adding resin particles into the wet-mixed material, and uniformly stirring and mixing to obtain the high-strength concrete.
8. The process for preparing high-strength concrete according to claim 7, wherein: in step S3, 30 to 40 parts by weight of an aqueous polyvinyl alcohol solution is added while adding the resin particles.
9. The process for preparing high-strength concrete according to claim 7, wherein: the surface of the resin particles is sanded.
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| CN202211581670.8A CN115849820B (en) | 2022-12-09 | 2022-12-09 | High-strength concrete and preparation process thereof |
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| CN202211581670.8A CN115849820B (en) | 2022-12-09 | 2022-12-09 | High-strength concrete and preparation process thereof |
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| CN115849820B CN115849820B (en) | 2023-11-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117125931A (en) * | 2023-08-28 | 2023-11-28 | 苏州南方混凝土有限公司 | Low-viscosity high-strength concrete and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000016882A (en) * | 1998-07-02 | 2000-01-18 | Nippon Chemical Kogyo Kk | Hydraulically cured product and its production |
| CN104829185A (en) * | 2015-03-30 | 2015-08-12 | 沈阳化工大学 | Environmentally friendly concrete prepared from recovered epoxy resin |
| CN107129171A (en) * | 2017-05-19 | 2017-09-05 | 上海隧道工程有限公司构件分公司 | Aggregate and dependent Concrete for substituting crushed stone aggregate |
| CN110002810A (en) * | 2019-04-15 | 2019-07-12 | 西安海天建材有限公司 | Concrete and its preparation process |
-
2022
- 2022-12-09 CN CN202211581670.8A patent/CN115849820B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000016882A (en) * | 1998-07-02 | 2000-01-18 | Nippon Chemical Kogyo Kk | Hydraulically cured product and its production |
| CN104829185A (en) * | 2015-03-30 | 2015-08-12 | 沈阳化工大学 | Environmentally friendly concrete prepared from recovered epoxy resin |
| CN107129171A (en) * | 2017-05-19 | 2017-09-05 | 上海隧道工程有限公司构件分公司 | Aggregate and dependent Concrete for substituting crushed stone aggregate |
| CN110002810A (en) * | 2019-04-15 | 2019-07-12 | 西安海天建材有限公司 | Concrete and its preparation process |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117125931A (en) * | 2023-08-28 | 2023-11-28 | 苏州南方混凝土有限公司 | Low-viscosity high-strength concrete and preparation method thereof |
| CN117125931B (en) * | 2023-08-28 | 2024-09-06 | 华东材料苏州有限公司 | Low-viscosity high-strength concrete and preparation method thereof |
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| CN115849820B (en) | 2023-11-21 |
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