CN112573877A - Concrete high pier and preparation method thereof - Google Patents
Concrete high pier and preparation method thereof Download PDFInfo
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- CN112573877A CN112573877A CN202011551498.2A CN202011551498A CN112573877A CN 112573877 A CN112573877 A CN 112573877A CN 202011551498 A CN202011551498 A CN 202011551498A CN 112573877 A CN112573877 A CN 112573877A
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/08—Producing shaped prefabricated articles from the material by vibrating or jolting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/245—Curing concrete articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/003—Methods for mixing
-
- 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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to a concrete high pier and a preparation method thereof, wherein the concrete high pier is mainly prepared from the following raw materials: 330 to 350 portions of cement; 40-45 parts of fly ash; 40-45 parts of mineral powder; 700-750 parts of sand; 1050-1100 parts of crushed stone; 160-170 parts of water; 5-6 parts of an additive; the sand is a mixture of river sand and machine-made sand, and the preparation process adopts layered mold-entering pouring, vibrating treatment and moisturizing and maintenance after mold removal. According to the invention, through the synergistic effect of raw material selection, targeted adjustment of raw material proportion and targeted preparation step improvement, the concrete can meet the construction performance of long-distance transportation and high-height pumping, and the prepared concrete has low bubble content and color difference, high glossiness and good durability.
Description
Technical Field
The invention relates to the technical field of bridge preparation, and particularly relates to a concrete high pier and a preparation method thereof.
Background
With the increasingly developed traffic systems of national highways, railways and the like, the construction of bridge concrete high piers is mature day by day. At present, concrete is mature in theoretical research, but a plurality of application problems exist in the construction application stage.
At present, the phenomena of more bubbles, large color difference and no gloss often appear on the concrete high pier, but some construction sites are close to important places such as world cultural heritage and national scenic spots, and in order to provide the environment of the whole construction site, when the concrete high pier is prepared, the concrete not only needs to achieve the construction performance of remote transportation and elevation pumping, but also has strict requirements on the appearance quality of the concrete high pier, and more problems are brought to the raw materials and the preparation of the concrete high pier.
Disclosure of Invention
The invention aims to: the concrete high pier raw material formula and the preparation method are adopted, the concrete can meet the construction performance of long-distance transportation and large-height pumping, the prepared concrete high pier has low bubble content and color difference, and has high glossiness and good durability.
In order to achieve the purpose, the invention adopts the technical scheme that:
the concrete high pier is characterized by being mainly prepared from 330 to 350 parts by weight of cement; 40-45 parts of fly ash; 40-45 parts of mineral powder; 700-750 parts of sand; 1050-1100 parts of crushed stone; 160-170 parts of water; 5-6 parts of an additive;
wherein the sand is a mixture of river sand and machine-made sand.
In the prior art, a plurality of application problems of concrete still exist in the construction application stage, and along with the enhancement of environmental awareness, the limited mining and limited purchasing of materials such as sand and stone are carried out, and the phenomenon of unstable quality occurs. After the concrete is transported for a long distance and pumped for a long distance, the construction performance is easily reduced, for example, poor workability and poor pumpability caused by too large slump loss can further influence the homogeneity of the concrete high pier. At present, a concrete formula does not exist, the construction performance of long-distance transportation and high-height pumping can be met, the prepared concrete high pier is excellent in appearance quality, low in bubble content and color difference, high in glossiness and good in durability. The factors affecting the performance of the concrete are many, and the factors affecting the construction performance and the appearance quality of the concrete are difficult to judge. Through a large number of experimental researches, in the raw materials used by the invention, cement, fly ash and mineral powder are selected as cementing materials; the sand is selected from the mixture of river sand and machine-made sand; and then the proportions of the broken stone, the water and the additive are adjusted, and the concrete high pier with good appearance quality is successfully prepared under the improved synergistic effect of raw material selection, targeted adjustment of the raw material proportions and targeted preparation steps.
Further, the weight ratio of the river sand to the machine-made sand is 0.4-0.8: 1. Through a large number of experimental researches of the inventor, the weight ratio of river sand to machine-made sand is an important influence factor of the construction condition and the appearance condition of concrete, when the weight ratio of the river sand to the machine-made sand is too small, the fineness modulus of the sand is too large, the mobility of the concrete is reduced, the slump damage is too large, air bubbles are difficult to discharge from the concrete, and the prepared concrete has the conditions of color difference, more air bubbles and no luster of a concrete structure. However, when the weight ratio of river sand to machine-made sand is too large, the fineness modulus of sand is too small, which affects the strength, workability, fluidity and other construction performances of concrete, and cannot meet the requirements of long-distance transportation and high-elevation pumping.
Furthermore, the mud content of the river sand is 2.4% -2.6%, and the stone powder content of the machine-made sand is 2.2-2.4 according to a methylene blue experiment MB.
Furthermore, the fineness modulus of the sand is 2.6-2.9. The fineness modulus of the sand has very important influence relation on the performance of the concrete which is transported in a long distance and pumped at a large height. Too high or too low fineness modulus not only affects the construction performance of the concrete, but also has certain influence on the appearance quality of the concrete high pier.
Further, the additive is a retarding polycarboxylic acid high-performance water reducing agent.
Furthermore, the additive accounts for 1.0-1.2% of the weight of the cementing material, and the cementing material is cement, fly ash and mineral powder. The construction performance and the appearance condition of the concrete have close influence relation with the adding proportion of the admixture, on the premise of meeting the strength requirement, the admixture is too large, the concrete has obvious phenomena of bleeding, bottom grabbing and the like, when the concrete is turned and stirred by a shovel, the resistance is very large, the color of the concrete can be yellowed, the viscosity of the concrete is increased, bubbles are not easy to escape, and the appearance quality of the concrete is poor. The reduction of the admixture dosage has obvious effect of improving the appearance of concrete, but when the admixture dosage is too small, the water consumption is increased, and the strength can not meet the requirement.
Further, the broken stone comprises small stones with the grain size of 4.75-9.5 mm and large stones with the grain size of 9.5-19 mm, and the weight ratio of the small stones to the large stones is 0.41-0.43: 1. The crushed stones with the proper particle size range and other raw materials can ensure better compactness of the concrete under the synergistic action, so that the homogeneity of the prepared concrete high pier is enhanced.
The invention also aims to provide a preparation method of the concrete high pier.
A preparation method of a concrete high pier comprises the following steps:
step 1, mixing the raw materials in proportion to obtain first concrete;
step 2, transporting the first concrete obtained in the step 1 to a construction site, and then carrying out secondary stirring to obtain second concrete;
step 3, performing layered pouring in a mold on the second concrete obtained in the step 2, and performing vibration treatment in the pouring process to ensure that the surface of the concrete poured on each layer is pasty and does not sink and have no air bubbles;
and 4, performing form removal treatment, and then performing moisture preservation and maintenance on the concrete high pier.
The invention discloses a preparation method of a concrete high pier, which is characterized in that the homogeneity and the appearance quality of the prepared concrete high pier are good under the synergistic effect of a plurality of important influence factors such as raw material selection, raw material proportioning, layered mold-entering pouring, vibration, moisturizing and maintenance after mold removal in the preparation process, the concrete has good construction performance in the pouring process, the method is simple, and the construction efficiency is high.
Further, the height of the concrete high pier is more than 50 m. Further, in the step 2, the distance from the first concrete to the construction site is 10km to 20 km.
Further, in the step 1, the slump of the first concrete is 200-220 mm, and the slump loss within 1h is less than or equal to 20 mm. Through long-time long-distance transportation, the slump of concrete has certain loss, and for the construction performance of guaranteeing the concrete that goes into the mould good, the slump of first concrete needs be in suitable within range.
Further, in the step 2, the slump of the second concrete is 170-190 mm, the slump loss within 1h is less than or equal to 20mm, and the slump expansion is more than or equal to 350 mm. For the concrete which is transported in a long distance and pumped in a high degree, good construction performance is necessary, and the construction performance is mainly reflected in the aspects of workability, pumpability and the like of the concrete. Through a great deal of experimental research of the inventor, the slump expansion and the slump loss of the concrete directly influence the pumpability and the workability of the concrete and the appearance performance of the concrete. When the slump is too large, the mortar floats upwards, stones sink to easily cause uneven concrete, a weak link of a concrete structure is formed, the concrete structure is damaged when the stress is concentrated but the design strength is not reached, the slump is too small, pumping is not easy, bubbles cannot vibrate out, the appearance color difference of the concrete structure is large, the appearance color is dull, and the bubble content is large.
Further, in the step 2, after the first concrete is transported to a construction site by a concrete tank truck, the concrete tank truck is reversed for 2min to 4min for secondary stirring to obtain the second concrete. After long-time long-distance transportation, the concrete needs to be stirred for the second time to ensure the uniformity and quality of the concrete.
Further, in the step 2, the concrete pulling quantity of the concrete tank truck is less than or equal to 8m3. The mode of pulling less and falling quickly is adopted, so that the loss of the concrete slump can be effectively reduced.
Further, the casting temperature in the step 3 is less than or equal to 28 ℃.
Further, in the step 3, the casting thickness of each layer of the second concrete is less than or equal to 30cm, and the vibrating time is 20-30 s in the casting process. The appropriate pouring thickness of each layer can better ensure the homogeneity and the appearance quality of the concrete high pier.
Further, spraying a concrete curing agent or/and pasting a moisture-preserving curing film on the surface of the concrete high pier for moisture-preserving curing. The fly ash and the mineral powder are mixed in the cementing material in the concrete raw material, so that the curing of the demolded concrete high pier is very important, the conventional drip tank moisturizing curing is adopted for the higher concrete high pier, the construction difficulty is high, the effect is low, and the curing water flows to the surface of the concrete and can affect the appearance of the concrete to a certain extent. Preferably, the concrete curing agent is sprayed on the surface of the concrete high pier, and then the moisture-preserving curing film is pasted on the surface of the concrete. By adopting the novel water-saving curing technology of the concrete curing liquid and the concrete water-saving moisturizing curing film, the construction effect is improved, and the good appearance quality of the concrete can be ensured.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. in the raw materials used in the invention, cement, fly ash and mineral powder are selected as cementing materials; the sand is selected from the mixture of river sand and machine-made sand; and then the proportions of the broken stone, the water and the additive are adjusted, and the concrete high pier with good appearance quality is successfully prepared under the improved synergistic effect of raw material selection, targeted adjustment of the raw material proportions and targeted preparation steps. The appearance quality of the prepared concrete high pier is detected, no color difference can be seen when the height of the concrete high pier is 5m away from the concrete high pier, and the color is the natural color of the concrete. The concrete has less air holes on the surface, the porosity is lower than 0.02%, the diameter of the air holes is smaller than 0.5mm, and the depth is smaller than 1 mm. The glossiness of the concrete high pier is good, the carbonization depth is less than 0.5mm in 3 months and 1.0mm in one year through manufacturing the maintenance test block under the same condition and verifying the concrete entity resilience and coring on site, no steel bar corrosion occurs, and the durability is good.
2. The invention discloses a preparation method of a concrete high pier, which is characterized in that the homogeneity and the appearance quality of the prepared concrete high pier are good under the synergistic effect of a plurality of important influence factors such as raw material selection, raw material proportioning, layered mold-entering pouring, vibration, moisturizing and maintenance after mold removal in the preparation process, the concrete has good construction performance in the pouring process, the method is simple, and the construction efficiency is high.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
The total length of a certain high-speed highway section is 12.544km, 20 bridges are shared, and the distance between a project construction site and a certain world cultural heritage and a national 5A-level scenic spot is only less than 20 km. In order to maintain and improve the good environment around the scenic spot, the concrete of the concrete high pier needs to be prepared to realize the construction performance of long-distance transportation and elevation pumping, and meanwhile, the concrete height needs to have excellent appearance quality requirements, good durability and stable quality. The concrete high pier raw materials and the proportion are shown in table 1.
TABLE 1 concrete ratio (kg/m)3)
Wherein the cement in table 1 is PO42.5 type; class II class F fly ash; mineral powder S95; the admixture is a retarding polycarboxylic acid high-performance water reducing agent with the model of JKP-R (II). The fine aggregate is a mixture of river sand and machine-made sand, wherein the content of machine-made sand powder is 2.3 according to a methylene blue test MB value, and the mud content of the river sand is 2.6%. The weight ratio of river sand to machine-made sand is 3: 7.
The preparation method comprises the following steps:
the raw materials are mixed according to a proportion, the slump of the mixed concrete is 210mm, the slump loss after 1h is 20mm, the workability is good, the compressive strength of the concrete is detected to meet the standard requirement of C40 concrete, then the mixed concrete is transported by a concrete tank truck, and after the concrete is transported to a construction site for about 12km, the concrete tank truck is reversed for 3min for secondary stirring; concrete tank truck transports 6m at every turn3The slump of the concrete after the secondary stirring is 180mm, the slump loss after 1h is 18mm, and the slump expansion is 420 mm. Then, performing layered pouring of the concrete subjected to secondary stirring in a mold by using a ground pump, wherein the thickness of each layer of poured concrete is 25cm, and performing vibration treatment in the pouring process to ensure that the surface of each layer of poured concrete is pasty and does not sink and have no air bubbles; and (4) performing form removal treatment, then performing moisture preservation and maintenance on the concrete high pier, spraying a concrete curing agent on the surface of the concrete high pier, and then pasting a moisture preservation and maintenance film.
The appearance quality of the prepared concrete high pier is detected, no color difference can be seen when the height of the concrete high pier is 5m away from the concrete high pier, and the color is the natural color of the concrete. The concrete has less air holes on the surface, the porosity is lower than 0.02%, the diameter of the air holes is smaller than 0.5mm, and the depth is smaller than 1 mm. The glossiness of the concrete high pier is good, the carbonization depth is less than 0.5mm in 3 months and 1.0mm in one year through manufacturing the maintenance test block under the same condition and verifying the concrete entity resilience and coring on site, no steel bar corrosion occurs, and the durability is good.
Examples 2-5 (varying the ratio of river sand to machine sand)
Examples 2-5 comparing the raw materials and the raw material ratios of example 1, examples 2-5 only changed the weight ratio of the river sand to the machine-made sand, the other raw materials and the raw material ratios were exactly the same as example 1, and the total weight ratio of the river sand to the machine-made sand in examples 2-5 was 733kg/m3The concrete curing test blocks prepared by mixing the raw materials of examples 2 to 5 were tested for their performance by preparing the curing test blocks under the same conditions, and the test results are shown in Table 2.
TABLE 2 concrete Properties
From the test results in table 2, it can be seen that the weight ratio of the river sand to the machine-made sand is an important influence factor of the concrete construction condition and the appearance condition, when the weight ratio of the river sand to the machine-made sand is too small, the fineness modulus of the sand is too large, the damage of the fluidity and slump of the concrete is too large, so that the air bubbles are difficult to discharge from the concrete, and the prepared concrete has the conditions of color difference, more air bubbles and no luster of a concrete structure. However, when the weight ratio of river sand to machine-made sand is too large, the fineness modulus of sand is too small, which affects the strength, workability, fluidity and other construction performances of concrete, and cannot meet the requirements of long-distance transportation and high-elevation pumping.
Examples 6 to 9
EXAMPLES 6-9 As compared with the raw materials and raw material ratios of example 1, examples 6-9 only changed the additivesThe addition ratio of the components in the cementing material is completely the same as that in the embodiment 1, and the total weight ratio of the cementing material to the admixture in the embodiments 6 to 9 is still 435.16kg/m3The proportion of the additive is changed, and the corresponding decrease and increase of the cementing material are simultaneously carried out. The performance of the concrete curing test block mixed with the raw materials of examples 6 to 9 was tested by making the curing test block under the same conditions while ensuring the same slump to be 180mm + -10 mm, and the test results are shown in Table 3.
TABLE 3 concrete Performance test
From the test results in table 3, the concrete workability and appearance have close influence relationship with the addition ratio of the admixture, on the premise of meeting the strength requirement, the admixture dosage is too large, the concrete has obvious phenomena of bleeding, bottom grabbing and the like, when the concrete is stirred by a shovel, the resistance is very large, the color of the concrete can be yellowed, the viscosity of the concrete is increased, the air bubbles are not easy to escape, and the appearance quality of the concrete is poor. The reduction of the admixture dosage has obvious effect of improving the appearance of concrete, but when the admixture dosage is too small, the water consumption is increased, and the strength can not meet the requirement.
Comparative example 1 (river sand doped only)
Comparative example 1 compared with example 1, the sand is river sand, and other raw materials and raw material proportions are completely the same as those in example 1. In comparative example 1, the sand was river sand, and the addition ratio was 733kg/m3. By manufacturing the curing test block under the same condition and testing the performance of the concrete curing test block in the comparative example 1, researches show that the river sand is only doped, so that the price is high, the timely supply cannot be guaranteed, and the fineness modulus and the mud content are unstable. The mixed concrete has poor appearance quality, serious color difference, porosity of 0.12%, pores with diameter of more than 2.5mm, and dull surface of concrete structure.
Comparative example 2 (machine-made sand only)
Comparative example 2 in comparison with example 1,the sand is machine-made sand, and other raw materials and the raw material proportion are completely the same as those in the example 1. In comparative example 1, the sand was machine-made sand, and the addition ratio was 733kg/m3. Through manufacturing the same-condition curing test block and testing the performance of the concrete curing test block of the comparative example 1, researches show that the concrete prepared by a single-doping mechanism has poor construction performance, and bubbles are difficult to discharge from the concrete, so that the appearance quality of the concrete is poor.
Comparative example 3 (when the cementitious Material is singly mixed with fly ash)
Comparative example 3 compared with example 1, no mineral powder was added to the cementitious material, no fly ash was added or only fly ash was added, the other raw materials and the raw material ratios were completely the same as those in example 1, the raw material ratios are shown in table 4, the same-condition curing test blocks were prepared, and the performance of the concrete curing test block of comparative example 3 was tested.
TABLE 4 concrete proportioning and Performance testing
From the test results in table 4, it can be seen that, when the fly ash and the mineral powder are not added, and the strength and the workability meet the requirements, the loss of slump of the blending ratio is verified to be serious by adding the fly ash, the measured slump immediately after the mixer is 180mm, the measured slump after 60min is 125mm, the loss of the slump of the concrete after 1 hour is up to 55mm, and the appearance quality of the prepared concrete is poor. The double-doping scheme of the fly ash and the mineral powder not only ensures the appearance requirement of the concrete, improves the workability of the concrete, but also can reduce the cost of the concrete.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A concrete high pier is characterized by being mainly prepared from the following raw materials in parts by weight,
330 to 350 portions of cement; 40-45 parts of fly ash; 40-45 parts of mineral powder; 700-750 parts of sand; 1050-1100 parts of crushed stone; 160-170 parts of water; 5-6 parts of an additive;
wherein the sand is a mixture of river sand and machine-made sand.
2. The concrete high pier according to claim 1, wherein the weight ratio of the river sand to the machine sand is 0.4-0.8: 1.
3. The concrete high pier according to claim 1, wherein the additive is added in an amount of 1.0-1.2% by weight of cementitious material, which is cement, fly ash and mineral powder.
4. The concrete high pier of claim 1, wherein the admixture is a set retarding polycarboxylic acid high performance water reducer.
5. The concrete high pier according to claim 1, wherein the crushed stones comprise small stones with a grain size of 4.75-9.5 mm and large stones with a grain size of 9.5-19 mm, and the weight ratio of the small stones to the large stones is 0.41-0.43: 1.
6. A method of manufacturing a concrete high pier according to any one of claims 1 to 5, comprising the steps of:
step 1, mixing the raw materials in proportion to obtain first concrete;
step 2, transporting the first concrete obtained in the step 1 to a construction site, and then carrying out secondary stirring to obtain second concrete;
step 3, performing layered pouring in a mold on the second concrete obtained in the step 2, and performing vibration treatment in the pouring process to ensure that the surface of the concrete poured on each layer is pasty and does not sink and have no air bubbles;
and 4, performing form removal treatment, and then performing moisture preservation and maintenance on the concrete high pier.
7. The method for preparing the concrete high pier according to claim 6, wherein in the step 1, the slump of the first concrete is 200 mm-220 mm, and the slump loss within 1h is less than or equal to 20 mm.
8. The method for preparing the concrete high pier according to claim 6, wherein in the step 2, the slump of the second concrete is 170-190 mm, the slump loss within 1h is less than or equal to 20mm, and the slump expansion is more than or equal to 350 mm.
9. The method for preparing the concrete high pier according to claim 6, wherein in the step 3, the thickness of each layer of the second concrete is less than or equal to 30cm, and the vibrating time is 20-30 s in the pouring process.
10. The method for manufacturing a concrete high pier according to any one of claims 6 to 9, wherein the surface of the concrete high pier is subjected to moisture-retention curing by spraying a concrete curing agent or/and applying a moisture-retention curing film.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114133191A (en) * | 2021-12-28 | 2022-03-04 | 中交二公局第一工程有限公司 | C50 high-performance concrete prepared from mixed sand and used for T beam pouring |
-
2020
- 2020-12-24 CN CN202011551498.2A patent/CN112573877A/en active Pending
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Application publication date: 20210330 |