CN110218046A - A kind of big density shielding concrete and preparation method thereof for capableing of pumping construction - Google Patents
A kind of big density shielding concrete and preparation method thereof for capableing of pumping construction Download PDFInfo
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- CN110218046A CN110218046A CN201910500314.0A CN201910500314A CN110218046A CN 110218046 A CN110218046 A CN 110218046A CN 201910500314 A CN201910500314 A CN 201910500314A CN 110218046 A CN110218046 A CN 110218046A
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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
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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
- C04B2111/00034—Physico-chemical characteristics of the mixtures
- C04B2111/00146—Sprayable or pumpable mixtures
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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
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00258—Electromagnetic wave absorbing or shielding materials
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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
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
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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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses the big density shielding concretes and preparation method thereof that one kind is capable of pumping construction, and the raw material components of concrete include coarse aggregate, fine aggregate, cement, water, additive；Coarse aggregate uses 5mm~20mm graded broken stone, is formed by 5mm~10mm and the rubble of 10mm~20mm two-stage gradation in 2:9~9:2 ratio mixture；Fine aggregate is using sand particle size distribution in 0mm~5mm；The mass fraction of each component is: cement: 10%, water 4.2%~5.2%, and fine aggregate 34%~38%, coarse aggregate 48%~55%, additive 0.1%~0.2%.Big density shielding concrete of the invention, density is big, advantages of good shielding performance, is not easy to isolate, intensity is high, good flowing properties, out machine slump 140mm or more, workability is good, and the pumping construction of remote (more than 150m) can be realized using normal concrete pumping equipment, improves work efficiency.
Description
Technical field
The invention belongs to building material technical fields, and in particular to one kind is capable of the big density shielding concrete of pumping construction
And preparation method thereof.
Background technique
Nuclear energy is also caused to environment and human health while bringing great economic benefit and social benefit to the mankind
Great threat, safety are always to perplex its key factor further developed.The radiation that nuclear device and nuclear facilities generate is more
Kind of multiplicity, the fission fragment and decay constant predominantly generated in nuclear reactor and other radiation sources by fission, decay and
Release α, β with energy, γ, neutron ray and x-ray etc..These radial energies pollute the environment, and make to operator
At injury, cause instrument material fever activation and lead to measuring instrument performance degradation etc., therefore radiation shield is taken to nuclear facilities
Measure is very necessary.
People have carried out a large amount of research to radiation protection, and have developed a series of protective materials.Wherein, cement concrete
It is ray protection material most widely used, economic at present, in works such as nuclear engineering reactor shielding structure, nuclear fuel storages
It is widely applied in journey.Especially by improving concrete using big density concrete to the protection energy of γ, λ ray and neutron current
Power becomes the optimal selection of nuclear engineering radiation-screening.
The main application of big density shielding concrete is characterized in shielding harm ray based on its higher density, therefore guarantees
Its density is most important, and this requires loaded concrete to have good compactness and homogenieity.But because of concrete raw material density
Between greatest differences make concrete mix easily laminated segregation, segregation phenomenon is more when especially concrete slump is excessive
Very, this may cause that cavity occurs in concrete or local density can not meet design requirement influences structual shield effect, generate peace
Full blast danger.This be also all the time big density concrete mixture it is (mixed using dry concrete mixture or middle low slump
Solidifying soil goes out the machine slump no more than one of 80mm), less the main reason for using pumping construction.
It can be seen that concrete disintegration, homogenieity are poor, it is closely knit to be not easy, construction intensity is big, past small side measures construction, inefficient
The process management of rate has not adapted to the needs of modern project management.Therefore, pass through the height of the big density of technical innovation realization
Performance-based is only contradiction, the thinking of enhancing structure density for solving big density and pumping construction.
Summary of the invention
The present invention aiming at the shortcomings in the prior art, provides a kind of big density shielding concrete for capableing of pumping construction, should
Concrete may be implemented in pumping construction, effectively solve big density concrete isolation, homogenieity is poor, it is closely knit to be not easy, construction intensity greatly,
The problems such as work efficiency is low.
To achieve the above object, the invention adopts the following technical scheme:
A kind of big density shielding concrete for capableing of pumping construction, the raw material components of the concrete include coarse aggregate, thin
Aggregate, cement, water, additive；
Coarse aggregate uses 5mm~20mm graded broken stone, presses 2:9 by 5mm~10mm and the rubble of 10~20mm two-stage gradation
~9: 2 ratio mixtures form；Fine aggregate is using sand particle size distribution in 0mm~5mm；
The mass fraction of each component is: cement: 10%, water 4.2%~5.2%, and fine aggregate 34%~38%, coarse aggregate
48%~55%, additive 0.1%~0.2%.
To optimize above-mentioned technical proposal, the concrete measure taken further include:
Coarse aggregate is formed by 5mm~10mm and 10~20mm two-stage gradation in 4: 6 ratio mixture.
The largest particles partial size of coarse aggregate is no more than 25mm and is no more than the 3/4 of reinforcing bar minimum spacing.
Coarse aggregate is the rubble of the heavy minerals such as bloodstone, barite processing；Fine aggregate is the heavys such as bloodstone, barite
The middle sand of ore processing
The middle sand particle size distribution of fine aggregate is sand particle size distribution in the area 0mm~5mmII, the fineness modulus of middle sand is 2.3~
3.0。
Coarse aggregate moisture content is less than 0.2%, and fine aggregate water content is less than 0.5%.
The ratio of the ratio of mud, that is, water and cement in concrete is not more than 0.60, and water is 175 ± 10kg/m3, sand coarse aggregate ratio model
Enclose 40~42%.
Using P.O42.5R cement；Additive uses river high performance water reducing agent of polyocarboxy acid JM-PCA (I) retardation setting type.
The slump value of the concrete is in 140~180mm, and slump-loss value is no more than 20% within 1 hour.
The present invention also provides the preparation methods that one kind can be capable of the big density shielding concrete of pumping construction, including with
Lower step: raw material components coarse aggregate, fine aggregate, cement, water, the additive of concrete are ready to, coarse aggregate using 5mm~
20mm graded broken stone is formed by 5mm~10mm and the rubble of 10~20mm two-stage gradation in 2: 9~9: 2 ratio mixtures；Fine aggregate
Using sand particle size distribution in 0mm~5mm；
According to following proportion, raw material is added sequentially in stirring container: the mass fraction of each component is: cement: 10%,
Water 4.2%~5.2%, fine aggregate 34%~38%, coarse aggregate 48%~55%, additive 0.1%~0.2%；Charging sequence
Are as follows: coarse aggregate, fine aggregate, cement, water, additive；
It is stirred 90~120s, obtains big density shielding concrete.
The beneficial effects of the present invention are: the grade that concrete of the invention is processed by the high close material such as magnetic iron ore, bloodstone
It is formed with components such as aggregate, cement, composite additive and water, the density of the concrete configured is big, and apparent density reaches
3500~4000kg/m3, 28d tensile strength is not less than 35MPa, good flowing properties, out machine slump 140mm or more, concrete 1
Hour slump-loss is no more than 20%, and workability is good, can be realized using normal concrete pumping equipment and (is more than at a distance
Pumping construction 150m)；Concrete shield ray performance of the invention is good, is not easy to isolate, improves work efficiency, and of the invention mixed
Solidifying soil mixture is easy to be poured, consolidate, and meets bulk density requirement, while can also keep high-strength, toughness and volume stability for a long time.
Specific embodiment
The present invention provides the big density shielding concrete that one kind is capable of pumping construction, aggregate is used with barite
The sandstone that mine and iron ore (generally including magnetic iron ore, bloodstone, limonite and siderite) mineral are process.Preparation can be used for
The big density shielding concrete of pumping construction selects the ore of processing aggregate using table 1.
The big density degree shielding concrete heavy aggregate of table 1
In embodiment, big density shielding concrete is prepared to reduce light material dosage (such as water and cement) as far as possible as original
Then, heavy material can be added, as far as possible guarantee concrete density more.It is capable of the original of the big density shielding concrete of pumping construction
Expect that component includes coarse aggregate, fine aggregate, cement, water, additive etc., the mass fraction of each component is: cement: 10%, water 4.2%
~5.2%, fine aggregate 34%~38%, coarse aggregate 48%~55%, additive 0.1%~0.2%.
Aggregate selects that voidage is low, the relatively small material of specific surface area, and coarse aggregate uses 5mm~20mm graded broken stone,
By big density ore (such as barite, iron ore) the broken rubble root for being processed into 5mm~10mm and 10~20mm two-stage gradation
According to needing to form in 2: 9~9: 2 ratio mixtures；Preferably, 2 are pressed by 5mm~10mm and the rubble of 10mm~20mm two-stage gradation:
9~4: 5 or 8: 3~9: 2 ratio mixtures form；Fine aggregate is processed by big density ore (such as barite, iron ore) is broken
Sand particle size distribution in the area 0mm~5mmII, the fineness modulus of middle sand are 2.3~3.0；
It is formed by 5mm~10mm and 10~20mm two-stage gradation in 4: 6 ratio mixture using coarse aggregate.The thick bone chosen
The largest particles partial size of material is no more than 25mm, convenient for control workability of concrete.
The reasonable value for determining concrete mix main design parameters, by deduce match ratio examination, reduce sand coarse aggregate ratio,
Influence of the ratio of mud to concrete performance, with the suitable coordination in works of determination, the ratio of mud in concrete of the invention, i.e. water
It is not more than 0.60 with the ratio of cement, water is 175 ± 10kg/m3, sand coarse aggregate ratio range 40~42%.
The present invention comprehensively considers in terms of mixture working performance and construction requirement, and the big density for pumping construction shields
The control of concrete mix slump design value is in 140~180mm, and 1 hour slump-loss value is no more than 20%, air content
Control is in 3%.Cement consumption, sand coarse aggregate ratio, additive combination are fully considered in design, make concrete have certain consistency and
Cohesiveness reaches workability most preferably, prevents from being layered, and meets pumpability, and heavy aggregate dosage maximizes again.
A specific embodiment of the invention, cement: using P.O42.5R cement, test to cement, cement test
Project includes setting time, stability, consumptive use of water normal consistence, specific surface area, intensity, and indices, which are met the technical standards, to be wanted
It asks, wherein technical standard is 175 common portland cement of GB.
Mixing water (water): testing to mixing water, and the project that mixing water is examined has: pH value, chloride (Cl-), sulfuric acid
Salt (SO42-), insoluble matter, soluble matter, alkali content (Na20+0.658K20), indices meet the technical standards requirement, wherein skill
Art standard is 63 concrete water standard of JGJ.
Additive: additive uses river high performance water reducing agent of polyocarboxy acid JM-PCA (I) retardation setting type, has to protect and collapses, thickens, pumping
The functions such as send, to improve loaded concrete working performance, when the project of inspection includes water-reducing rate, bleeding rate ratio, air content, condensation
Between, compressive strength rate, slump ongoing change amount, indices meet the technical standards requirement, and wherein technical standard is GB 8076
Concrete admixture.
Aggregate: coarse aggregate is using bloodstone (5-10) mm rubble, (10-20) mm rubble, fine aggregate using in (0-5) mm
Sand.In Mix Ratio Test, (5-10) mm rubble and (10-20) mm rubble are carried out according to a certain percentage using according with rubble
Close the requirement of (5-20) mm continuous size fraction gradation.Mix physical performance, pumpability, density, intensity for acquisition loaded concrete, to (5-
10) mm rubble and (10-20) mm rubble have carried out optimum combination, carry out respectively from 2: 9 to 9: 2 according to small crushed stone than big rubble
Test, for decimation stage with optimal, porosity the smallest 4: 6 is optimal combination.
Coarse aggregate examine project have: grain composition, apparent density, bulk density, porosity, clay content, clod content,
Flat-elongated particles content, colorimetric analysis, indices meet the technical standards requirement, and wherein technical standard is the common coagulation of JGJ 52
Native sand, Shi Zhiliang and test method standard；
Fine aggregate examine project have: grain composition, fineness modulus, apparent density, bulk density, porosity, clay content,
Clod content, content of stone powder (MB value), colorimetric analysis, indices meet the technical standards requirement, and wherein technical standard is JGJ
52 regular concrete sands, Shi Zhiliang and test method standard.
Optimal components ratio: water 4.5%~4.8%, cement 9%~11%, sand 34%~36% in hematite ore, bloodstone is broken
Stone 49%~52%, additive 0.1%~0.2%.
Final concrete mix: water 174kg/m3(about 4.7%), cement 375kg/m3It is (about 10.1%), red
Sand 1292kg/m in iron ore3(about 34.9%), bloodstone rubble 5mm~10mm are 744kg/m3, bloodstone rubble 10mm~
20mm is 1115kg/m3(bloodstone rubble is about 50.2% altogether), additive JM-PCA (work) is 6.38kg/m3(about
0.2%), used fine aggregate water content is less than 0.5%, and coarse aggregate moisture content is less than 0.2%.Match ratio is as shown in table 2.
2 concrete mix of table
The invention also discloses the preparation methods that one kind is capable of the big density shielding concrete of pumping construction, including following step
It is rapid:
(1) raw material components coarse aggregate, fine aggregate, cement, water, the additive of concrete are ready to, coarse aggregate uses 5mm
~20mm graded broken stone is formed by 5mm~10mm and the rubble of 10mm~20mm two-stage gradation in 2: 9~9: 2 ratio mixtures；It is excellent
Choosing, it is formed by 5mm~10mm and the rubble of 10mm~20mm two-stage gradation in 2: 9~4: 5 or 8: 3~9:2 ratio mixture；Carefully
Aggregate is using sand particle size distribution in 0mm~5mm；
(2) according to following proportion, successively coarse aggregate, fine aggregate, cement, water, additive are added in stirring container: each
The mass fraction of component is: coarse aggregate 48%~55%, fine aggregate 34%~38%, cement: 10%, water 4.2%~5.2%,
Additive 0.1%~0.2%；
(3) it is stirred 90~120s, obtains big density shielding concrete.
Specifically, concrete raw material should carry out warehousing in advance before concrete construction, and strict control goes out the machine slump；According to
The match ratio trial concrete of table 2, is stirred using forced mixer, and is stirred using with identical method of constructing, and
Charging sequence are as follows: coarse aggregate, fine aggregate, cement, water, additive.Concrete production feeding sequence, mixing time mix concrete
The mechanical property for closing object and concrete has a certain impact.Appropriate setting is carried out to feeding sequence and mixing time, can be made
Even slurry dispersed encapsulated is on the surface of aggregate and the gap of filler aggregate.Appropriate mixing time also gives full play to additive
Effect avoids the too long guarantor for weakening additive of mixing time from collapsing ability.
Concrete mix, pump-conveying property test result are shown in Table 3.
3 concrete mix of table, pump-conveying property
Seen from table 3, the concrete apparent density of trial is 3800kg/m3, the slump is 160 ± 30mm, meets design
Target and construction need, and simultaneous pumping distance reaches 243m.
Before the pump line arrangement of pump concrete, it is necessary to be checked by pump tube length.Pump line arrangement paving as straight as possible, to the greatest extent
Amount reduces elbow, if elbow must be used, uses chain radius elbow and 135 ° of elbow as far as possible.Pump line connection must connect steady
Gu avoiding pressure leakage.Loaded concrete should verify pumpability before pumping and whether meet stringing situation, and when pumping will have enough
Profit pump mortar profit pump, for pumping adequate condition is provided.When loaded concrete pumps, pump line mouth can just be mixed after seeing mortar
Coagulate the pumping of soil.
Final construction technical data is shown in Table 4:
Table 4
| Project | Project | Conclusion | Remarks |
| 1 | Optimum mixing time (s) | 120 | |
| 2 | Optimum vibrating time (s) | 30~40 | |
| 3 | Loaded concrete apparent density (kg/m3) | > 3600 | Meet design requirement |
| 4 | The loaded concrete presetting period (h) | 7 | |
| 5 | Loaded concrete final setting time (h) | 10 | |
| 6 | The slump (mm) | 160±30 | |
| 7 | Blanking height (m) | 1.5 | |
| 8 | Blanking point spacing (m) | 2 | |
| 9 | Pour layering (mm) | 300 | |
| 10 | Spacing of vibrating (mm) | 300~350 | |
| 11 | Speed of perfusion (m3/h) | 20 |
By table 4 as it can be seen that concrete match ratio according to the present invention when preparation method, obtained concrete apparent density are greater than
3600kg/m3, porosity is low, firm and shielding properties is high, meets design requirement, and the slump is 160 ± 30mm, mobile performance
It is good, meet pumping needs.
Obtained big density shielding concrete results of property is shown in Table 5.
Table 5
In conclusion big (3500~the 4000kg/ of concrete apparent density of the shielding concrete density configured of the invention
m3), 28d tensile strength is not less than 35MPa, 1 hour good flowing properties (machine slump 140mm or more out), concrete slump
Loss is no more than 20%, and workability is good, is to realize that the pumping of remote (more than 150m) is applied using normal concrete pumping equipment
Work.Concrete mix of the invention is easy to be poured, tamping, not isolate, and meets bulk density requirement, while the concrete can be protected for a long time
Hold high-strength, toughness and volume stability.
The above is only the preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-described embodiment,
All technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
For those of ordinary skill, several improvements and modifications without departing from the principles of the present invention should be regarded as protection of the invention
Range.
Claims (10)
1. the big density shielding concrete that one kind is capable of pumping construction, which is characterized in that the raw material components of the concrete include
Coarse aggregate, fine aggregate, cement, water, additive；
Coarse aggregate uses 5mm~20mm graded broken stone, presses 2: 9~9 by 5mm~10mm and the rubble of 10mm~20mm two-stage gradation
: 2 ratio mixtures form；Fine aggregate is using sand particle size distribution in 0mm~5mm；
The mass fraction of each component is: cement: 10%, water 4.2%~5.2%, and fine aggregate 34%~38%, coarse aggregate 48%~
55%, additive 0.1%~0.2%.
2. big density shielding concrete according to claim 1, which is characterized in that coarse aggregate by 5mm~10mm and 10~
20mm two-stage gradation is formed in 4: 6 ratio mixture.
3. big density shielding concrete according to claim 1, which is characterized in that the largest particles partial size of coarse aggregate does not surpass
Cross 25mm.
4. big density shielding concrete according to claim 1, which is characterized in that coarse aggregate is bloodstone, barite etc.
The rubble of heavy mineral processing；Fine aggregate is the middle sand of the heavy minerals such as bloodstone, barite processing.
5. big density shielding concrete according to claim 1, which is characterized in that the middle sand particle size distribution of fine aggregate is
Sand particle size distribution in the area 0mm~5mmII, the fineness modulus of middle sand are 2.3~3.0.
6. big density shielding concrete according to claim 1, which is characterized in that coarse aggregate moisture content is less than 0.2%, carefully
Water content ratio of aggregate is less than 0.5%.
7. big density shielding concrete according to claim 1, which is characterized in that the ratio of mud in concrete is not more than
0.60, water is 175 ± 10kg/m3, sand coarse aggregate ratio range 40~42%.
8. big density shielding concrete according to claim 1, which is characterized in that using P.042.5R cement；Additive
Using river high performance water reducing agent of polyocarboxy acid JM-PCA (I) retardation setting type.
9. big density shielding concrete according to claim 1, which is characterized in that the slump value of the concrete is 140
~180mm, slump-loss value is no more than 20% within 1 hour.
10. the preparation method that one kind is capable of the big density shielding concrete of pumping construction, which comprises the following steps:
Raw material components coarse aggregate, fine aggregate, cement, water, the additive of concrete are ready to, coarse aggregate uses 5mm~20mm
Graded broken stone is formed by 5mm~10mm and the rubble of 10mm~20mm two-stage gradation in 2: 9~9: 2 ratio mixtures；Fine aggregate is adopted
With sand particle size distribution in 0mm~5mm；
According to following proportion, raw material is added sequentially in stirring container: the mass fraction of each component is: cement: 10%, water
4.2%~5.2%, fine aggregate 34%~38%, coarse aggregate 48%~55%, additive 0.1%~0.2%；
It is stirred 90~120s, obtains big density shielding concrete.
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| CN112951346A (en) * | 2020-11-30 | 2021-06-11 | 南京航空航天大学 | Mix proportion design method suitable for mixed recycled coarse aggregate concrete |
| CN113336503A (en) * | 2021-07-01 | 2021-09-03 | 广东永泰混凝土有限公司 | Barite weight-balance concrete and preparation method thereof |
| CN115321909A (en) * | 2022-08-12 | 2022-11-11 | 湖北合力久盛混凝土有限公司 | Radiation-proof concrete and preparation method thereof |
| CN115321913A (en) * | 2022-08-22 | 2022-11-11 | 中建商品混凝土有限公司 | Road concrete suitable for tropical monsoon climate and preparation method thereof |
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| CN112951346A (en) * | 2020-11-30 | 2021-06-11 | 南京航空航天大学 | Mix proportion design method suitable for mixed recycled coarse aggregate concrete |
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| CN115321913A (en) * | 2022-08-22 | 2022-11-11 | 中建商品混凝土有限公司 | Road concrete suitable for tropical monsoon climate and preparation method thereof |
| CN115321913B (en) * | 2022-08-22 | 2023-08-29 | 中建商品混凝土有限公司 | Road concrete suitable for tropical monsoon climate and preparation method thereof |
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Application publication date: 20190910 |