CN110877967A - High-density anti-freezing-seepage marine concrete and preparation method thereof - Google Patents
High-density anti-freezing-seepage marine concrete and preparation method thereof Download PDFInfo
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- CN110877967A CN110877967A CN201911167011.8A CN201911167011A CN110877967A CN 110877967 A CN110877967 A CN 110877967A CN 201911167011 A CN201911167011 A CN 201911167011A CN 110877967 A CN110877967 A CN 110877967A
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- graphene oxide
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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
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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
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/24—Sea water resistance
Abstract
The invention belongs to the technical field of high performance of marine engineering, and particularly relates to high-density anti-freezing-seepage marine engineering concrete and a preparation method thereof. The cement-based composite material consists of cement, mineral admixture, sand, pebbles, additive, graphene oxide and water, and the raw materials are proportioned as follows: 270-280 kg/m cement3180-190 kg/m of mineral admixture3685-711 kg/m of sand31074-1119 kg/m stone39-9.4 kg/m of additive30.135-0.141 kg/m of graphene oxide3157-164 kg/m of water3. According to the invention, the binding capacity of calcined metakaolin and chloride ions is utilized, the influence of calcined metakaolin on the workability of a cement-based material is reduced through silica fume, the closest packing effect of a cementing system is achieved, the compactness of the cementing system is further improved by utilizing graphene oxide, and the workability and the anti-freezing effect of concrete are improved by regulating and controlling an additive and a sand rate.
Description
Technical Field
The invention belongs to the technical field of high performance of marine engineering, and particularly relates to high-density anti-freezing-seepage marine engineering concrete and a preparation method thereof.
Background
The marine concrete structure has a severe service environment, is not only eroded by marine environmental factors such as temperature, humidity change and harmful ions, but also bears the scouring and abrasion of sea sand, sea ice and the like. Due to the coupling effect of the multiple factors, the problems of protective layer peeling, steel bar corrosion and the like of the concrete structure in the design service life are caused, the material degradation of the structure occurs early, and the service performance of the structure is finally lost, so that the important problem of influencing the service life of the concrete structure is solved.
At present, the marine concrete is mainly added with a large amount of mineral admixture to improve the durability of the concrete, but according to research and development, most of marine engineering still has the problem of poor service performance, and according to the reason, the chloride ion permeation effect in seawater is not fundamentally slowed down. The invention starts from the concrete compactness and the combination of special materials and chloride ions, and slows down the invasion depth and the invasion speed of the chloride ions into the concrete as much as possible, thereby achieving the effect of prolonging the service life of the concrete.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides high-density anti-freezing-seepage marine concrete and a preparation method thereof.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows:
the high-density frost-resistant marine concrete consists of cement, mineral admixture, sand, stones, additive, graphene oxide and water, and the raw material ratio is as follows: 270-280 kg/m cement3180-190 kg/m of mineral admixture3685-711 kg/m of sand31074-1119 kg/m stone39-9.4 kg/m of additive30.135-0.141 kg/m of graphene oxide3157-164 kg/m of water3。
In the scheme, the sand rate of the high-density frost-resistant marine-seepage-resistant concrete is controlled to be 0.38-0.39.
In the scheme, the mineral admixture is composed of modified metakaolin and S95 mineral powder, and the mass ratio of the modified metakaolin to the S95 mineral powder is 55-65: 35-45.
In the scheme, the modified metakaolin is prepared by ball milling and blending silica fume and calcined metakaolin according to the mass ratio of 4-5: 1-2.
In the scheme, the additive is a polycarboxylic acid high-efficiency water reducing agent compounded with air entraining components.
A preparation method of high-density frost-resistant marine concrete comprises the following steps:
(1) preparing modified metakaolin: mixing silica fume and calcined metakaolin, and then placing the mixture into a ball mill for ball milling and blending to prepare modified metakaolin;
(2) blending graphene oxide and an additive and performing ultrasonic treatment to obtain a graphene oxide/polycarboxylic acid high-efficiency water reducing agent;
(3) sequentially adding stones, sand, cement and mineral admixtures, pre-stirring, uniformly mixing, then beginning to stir formally, respectively adding water and the graphene oxide/polycarboxylic acid high-efficiency water reducing agent in the stirring process, and uniformly stirring to obtain the high-density anti-freeze infiltration marine concrete.
In the scheme, the ball-milling and blending ball-material ratio is 100: 6-100: 8, the ball-milling rotating speed is 60 r/min-80 r/min, and the ball-milling time is 20-30 min.
In the scheme, the pre-stirring time is 1-2 min, and the formal stirring time is controlled to be 3-5 min.
The invention has the beneficial effects that: according to the invention, firstly, the binding capacity of calcined metakaolin and chloride ions is utilized, the influence of calcined metakaolin on the workability of a cement-based material is reduced through silica fume, secondly, a minimum water requirement method is used, so that a gel system achieves the closest packing effect, and the capability of graphene oxide for improving the compactness of the gel system is utilized again, so that the compactness of the system is further improved. The invention improves the workability and the frost resistance of the concrete by regulating and controlling the admixture and the sand rate, obviously improves the frost penetration resistance of the concrete by combining the high-compactness effect, acts on the actual marine environment and can meet the requirement of durability required by engineering.
Detailed Description
In order to better understand the present invention, the following examples are further provided to illustrate the present invention, but the present invention is not limited to the following examples.
Example 1
The high-density frost-resistant marine concrete is prepared by the following steps:
(1) preparing modified metakaolin: the method comprises the steps of utilizing excellent ball effect of silica fume to make up for the defect that calcined metakaolin can reduce the workability of a cement-based material, controlling the mass ratio of the silica fume to the calcined metakaolin to be 4:1, mixing the silica fume and the calcined metakaolin, placing the mixture into a ball mill for blending and ball milling, wherein the ball-material ratio of ball milling and blending is 100: 6-100: 8, and the ball milling rotation speed is 60 r/min-80 r/min, so as to prepare the modified metakaolin;
(2) determining the components of a gelling system:
a. determining the components of the mineral admixture, selecting modified metakaolin and S95 mineral powder as the mineral admixture, and determining the proportion of the modified metakaolin and the S95 mineral powder by adopting a minimum water demand method, wherein the specific test process is as follows:
mixing a polycarboxylic acid high-efficiency water reducing agent (the fixed mixing amount is 0.8%) and part of water, pouring the mixture into a stirring pot, adding 270g of cement and 80g of mineral admixture (wherein the mineral admixture is composed of modified metakaolin and S95 mineral powder serving as mineral admixtures), pouring the mixture into the stirring pot, slowly stirring for 1min, then stirring at a high speed for 1min, scraping the mixture at the edge and the bottom of the pot after stopping stirring, and stirring at a high speed for 5 min. Experiments prove that when the proportion of the modified metakaolin to the S95 mineral powder is (55-65): 35-45), the water consumption of the mixture is the lowest when the mixture is changed from a wet solid (formed into a spherical shape) into flat and uniform slurry.
b. The mixing ratio of each component in the gelling system is determined as follows: the initial mix proportion is shown in table 1, and the mix proportion shown in table 1 is verified by trial test that the concrete has poor workability, slow flowing speed and only 170mm of initial expansion, so that the sand rate of the concrete is adjusted subsequently, the mix proportion is adjusted to 0.38 and 0.39 as shown in table 2 after the adjustment and optimization, the working performance of the concrete is obviously improved, and the initial expansion can reach 215mm and 225 mm.
TABLE 1 initial mix ratio (kg/m)3)
TABLE 2 optimized mix ratio (kg/m)3)
The raw materials for preparing the concrete are sampled according to the mixture ratio shown in Table 2, and are manufactured according to the standard GB/T50081 Standard for testing the mechanical properties of the common concrete. Adding coarse aggregate, fine aggregate and a cementing material (cement and mineral admixture) in sequence into a horizontal shaft forced concrete mixer, premixing for 1min, mixing uniformly, starting formal mixing, adding water and a graphene oxide/polycarboxylic acid high-efficiency water reducing agent prepared in advance (the graphene oxide and the admixture are mixed and ultrasonically treated for 60min to obtain the graphene oxide/polycarboxylic acid high-efficiency water reducing agent) in the mixing process, controlling the mixing time to be about 3min, and pouring out a test piece required by the subsequent test from the concrete mixer.
Example 2
The high-density frost-resistant marine concrete is prepared by the following steps:
(1) the component distribution ratios are shown in table 3 below;
TABLE 3 optimized mix ratio (kg/m)3)
The raw materials for preparing the concrete are sampled according to the mixture ratio shown in the table 3, and are manufactured according to the standard GB/T50081 Standard for testing the mechanical properties of the common concrete. Adding coarse aggregate, fine aggregate and a cementing material (cement and mineral admixture) in sequence into a horizontal shaft forced concrete mixer, premixing for 1min, mixing uniformly, starting formal mixing, adding water and a graphene oxide/polycarboxylic acid high-efficiency water reducing agent prepared in advance (the graphene oxide and the admixture are mixed and ultrasonically treated for 60min to obtain the graphene oxide/polycarboxylic acid high-efficiency water reducing agent) in the mixing process, controlling the mixing time to be about 3min, and pouring out a test piece required by the subsequent test from the concrete mixer.
Example 3
The high-density frost-resistant marine concrete is prepared by the following steps:
(1) the component distribution ratios are shown in table 4 below;
TABLE 4 optimized mix ratio (kg/m)3)
The raw materials for preparing the concrete were sampled in the proportions shown in Table 4, and the samples were prepared according to the standard GB/T50081 Standard for testing mechanical Properties of ordinary concrete. Adding coarse aggregate, fine aggregate and a cementing material (cement and mineral admixture) in sequence into a horizontal shaft forced concrete mixer, premixing for 1min, mixing uniformly, starting formal mixing, adding water and a graphene oxide/polycarboxylic acid high-efficiency water reducing agent prepared in advance (the graphene oxide and the admixture are mixed and ultrasonically treated for 60min to obtain the graphene oxide/polycarboxylic acid high-efficiency water reducing agent) in the mixing process, controlling the mixing time to be about 3min, and pouring out a test piece required by the subsequent test from the concrete mixer.
Comparative example
C40 concrete with same strength grade
TABLE 5 concrete mix proportion of same strength grade C40
The high-density anti-freezing-seepage marine concrete of the invention is subjected to concrete performance tests, including porosity, chloride ion permeability resistance and freezing resistance tests, and compared with comparative examples, the results are shown in tables 6, 7 and 8.
TABLE 6 porosity test results
TABLE 7 electric flux test results
| Group of | 56d electric flux result/C |
| C40 concrete with same strength grade | 900 |
| C40 concrete designed by the invention | 550 |
TABLE 8 Freeze thaw cycle resistance test results
| Group of | Maximum number of cycles |
| C40 concrete with same strength grade | 200 |
| C40 concrete designed by the invention | 300 |
As can be seen from the results in Table 6, the mercury intrusion test result shows that the porosity of the concrete designed by the invention is 4.9%, which is reduced by 51.5% compared with the porosity of the concrete with the same strength grade. As can be seen from the results in Table 7, the electric flux test results show that the electric flux of the concrete 56d designed by the invention is 550C, which is 38.9% lower than that of the concrete 56d with the same strength grade. As can be seen from the results in Table 8, the test results of the rapid freeze-thaw cycle show that the maximum times of the freeze-thaw cycle resistance of the concrete designed by the invention can reach 300 times, which is 100 times higher than that of the concrete with the same strength grade.
It is apparent that the above embodiments are only examples for clearly illustrating and do not limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications are therefore intended to be included within the scope of the invention as claimed.
Claims (8)
1. The high-density anti-freezing marine concrete is characterized by comprising cement, mineral admixture, sand, stones, admixture, graphene oxide and water, wherein the raw materials are in proportion: 270-280 kg/m cement3180-190 kg/m of mineral admixture3685-711 kg/m of sand31074-1119 kg/m stone39-9.4 k of additiveg/m30.135-0.141 kg/m of graphene oxide3157-164 kg/m of water3。
2. The high-density frost-resistant marine concrete according to claim 1, wherein the sand ratio of the high-density frost-resistant marine concrete is controlled to be 0.38-0.39.
3. The high-density anti-freeze marine concrete according to claim 1, wherein the mineral admixture is composed of modified metakaolin and S95 mineral powder, and the mass ratio of the modified metakaolin to the S95 mineral powder is 55-65: 35-45.
4. The high-compaction anti-freezing-infiltration marine concrete according to claim 3, wherein the modified metakaolin is prepared by ball milling and blending silica fume and calcined metakaolin according to a mass ratio of 4-5: 1-2.
5. The high-density frost penetration resistant marine concrete according to claim 1, wherein the admixture is a polycarboxylic acid high-efficiency water reducing agent compounded with air entraining components.
6. The preparation method of the high-density frost-resistant marine concrete according to any one of claims 1 to 5, characterized by comprising the following steps:
(1) preparing modified metakaolin: mixing silica fume and calcined metakaolin, and then placing the mixture into a ball mill for ball milling and blending to prepare modified metakaolin;
(2) blending graphene oxide and an additive and performing ultrasonic treatment to obtain a graphene oxide/polycarboxylic acid high-efficiency water reducing agent;
(3) sequentially adding stones, sand, cement and mineral admixtures, pre-stirring, uniformly mixing, then beginning to stir formally, respectively adding water and the graphene oxide/polycarboxylic acid high-efficiency water reducing agent in the stirring process, and uniformly stirring to obtain the high-density anti-freeze infiltration marine concrete.
7. The preparation method of claim 6, wherein the ball-milling blending ball-material ratio is 100: 6-100: 8, the ball-milling rotation speed is 60 r/min-80 r/min, and the ball-milling time is 20-30 min.
8. The preparation method according to claim 6, wherein the pre-stirring time is 1min to 2min, and the formal stirring time is controlled to be 3min to 5 min.
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| CN112551978A (en) * | 2020-12-11 | 2021-03-26 | 成都果聚烽环保科技有限公司 | Preparation method of pervious concrete |
| CN113480261A (en) * | 2021-07-23 | 2021-10-08 | 济南大学 | GO-Ag nanofluid modified chlorine ion permeation resistant marine concrete and preparation method thereof |
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Application publication date: 20200313 |