KR102052655B1 - Concrete composition and concrete structure thereof - Google Patents

Abstract

The present invention relates to a high visibility concrete composition comprising 12-19 wt% of white Portland cement, 4-9 wt% of water, 30-45 wt% of a fine aggregate, and 33-48 wt% of a coarse aggregate. The high visibility concrete composition further includes 0.001-0.03 part by weight of an admixture based on white Portland cement weight and uses the white Portland cement having 85-96 of whiteness. Limiting the whiteness of the white Portland cement ensures visibility of a structure manufactured by the concrete composition. The concrete composition using the white Portland cement usually has a problem of poor visibility after curing in rainy weather or at night, especially. To solve the problem, the present invention ensures visibility of a concrete composition and hardness such as compression strength by using the white Portland cement having 85 or more of whiteness. The white Portland cement is mixed with one among slag micropowder, fly ash, silica fume, or waste glass. A mixing ratio of the white Portland cement and one among the slag micropowder, the flay ash, the silica fume and the waste glass is 95:5-50:50.

Description

Visibility improvement concrete composition and concrete structure using same {CONCRETE COMPOSITION AND CONCRETE STRUCTURE THEREOF}

The present invention relates to the construction field, and in particular, to a visibility improved concrete composition and a concrete structure using the same.

Road structures such as roads, curbs, barriers, and railings are installed in concrete or steel. Reflectors are attached to road structures made of steel to ensure driver visibility, but it is difficult to attach reflectors to concrete road structures.

In the case of concrete road structures, there is a problem that the driver's safety is lowered because visibility is reduced at night and in rain.

Conventionally, because it is difficult to control the whiteness (WHITENESS) of the concrete composition, a bright color is added to the waterproofing material applied to the concrete surface.

However, in this case, there is a problem that it is difficult to secure visibility when the applied waterproofing material is dropped.

The present invention has been devised to solve the above problems, and proposes a visibility improved concrete composition and a concrete structure using the same to improve the whiteness (WHITENESS) of cement and additives to ensure visibility.

In order to solve the above problems, the present inventors improved visibility concrete composition 12 to 19% by weight of white Portland cement; 4-9 weight% of water; Fine aggregate 30-45 wt%; Coarse aggregate 33 to 48% by weight; including, based on the weight of the white portland cement, 0.001 to 0.03 parts by weight of admixture is further mixed, the white portland cement is white portland cement 85-96 of whiteness (Hunter's method, WHITENESS) Use

The white portland cement is mixed with any one of slag fine powder, fly ash, silica fume or waste glass, and the mixing ratio of any one of the white portland cement and the slag fine powder, fly ash, silica fume or waste glass is 95: 5 to 50: It is preferable that it is 50.

The slag powder, fly ash, silica fume. It is preferable that the waste glass has a whiteness (hunter method, WHITENESS) of 80 to 90.

The admixture is preferably any one of calcium, zinc sterite, silane, siloxane, trioctylsilane and trioctylsiloxane.

Concrete structure using the concrete composition according to an embodiment of the present invention, the reflectance is preferably 0.6 or more.

The concrete structure is preferably a barrier, median, curb or road structure.

The high visibility concrete composition of the present invention and the concrete structure using the same have high whiteness of the composition itself, thereby ensuring visibility at night and in rainy weather.

1 is a color coordinate of white Portland cement or binder
2 is a comparison result of the visibility of the concrete composition according to an embodiment of the present invention
3 is a comparison result of visibility of rainy weather and sunny days of the concrete composition according to an embodiment of the present invention

An embodiment of the improved visibility concrete composition and a concrete structure using the same according to the present invention will be described in detail with reference to the accompanying drawings, in the description with reference to the accompanying drawings, the same or corresponding components are given the same reference numerals. And duplicate description thereof will be omitted.

In addition, terms such as first and second used below are merely identification symbols for distinguishing the same or corresponding components, and the same or corresponding components are limited by terms such as the first and second components. no.

In addition, the coupling does not only mean a case where the physical contact is directly between the components in the contact relationship between the components, other components are interposed between the components, the components in the other components Use it as a comprehensive concept until each contact.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the improved concrete composition and concrete structure using the same.

Visibility improvement concrete composition of the present invention is 12 to 19% by weight of white Portland cement; 4-9 weight% of water; Fine aggregate 30-45 wt%; Coarse aggregate 33 ~ 48% by weight; including, based on the weight of the white portland cement, 0.001 to 0.03 parts by weight of admixture is further mixed, characterized in that the use of white portland cement with a whiteness (hunter, WHITENESS) 85 ~ 96 .

The whiteness of the cement is limited to ensure visibility of a structure made of the concrete composition of the present invention.

Concrete compositions using ordinary portland cement have had a problem of poor visibility after curing.

In particular, there is a problem that visibility is poor at rain or at night.

In order to solve the above problems, white portland cement having a whiteness of 85 or more is used to secure visibility of the concrete composition, and to secure rigidity such as compressive strength.

The raw material of the white Portland cement of the present invention is calcium oxide (CaO) of 50% by weight or more, silicon dioxide (SiO ₂ ) of 5% by weight or less, magnesium oxide (MgO) of 3% by weight or less, loss of ignition 45 Preference is given to using only limestone with a% or less and a water content of 5% by weight or less.

In addition, the primary grinding step of grinding the limestone as a raw material; Clinker baking step of heating the crushed raw material to 1400 ~ 1600 ℃ to produce a clinker (clinker); Solid fuel injection step of spraying the pulverized solid fuel to the clinker (clinker); A cooling step of cooling the clinker; It is preferably manufactured by a process comprising a; clinker secondary grinding step of grinding the clinker (clinker) to have the same powder degree.

The clinker produced at this time is C ₃ S (Alite) 60-75 wt%; 10-20 wt.% C ₂ S (Belite, Belite); 2 to 11% by weight of C ₃ A (tricalcium aluminate); preferably.

Specifically, after the first milling step of crushing the raw material to remove the Fe-based heavy metal powder using a magnetic to the ground material, and after the clinker secondary grinding step to remove the Fe-based heavy metal powder secondaryly It is preferable to further comprise a heavy metal removal step.

Clinker Crusher crushed in the second grinding stage is crushed to Blaine 3,000 ~ 7,000㎠ / g.

The white portland cement is mixed with any one of slag fine powder, fly ash, silica fume or waste glass, and the mixing ratio of any one of white portland cement and slag fine powder, fly ash, silica fume or waste glass is 95: 5 ~ 50: 50 It is preferable.

At this time, the whiteness of the slag powder, fly ash, silica fume or waste glass mixed with a white portland cement (binder method, WHITENESS) is also used as 80 ~ 90.

In addition, the admixture mixed in the concrete composition of the present invention is preferably any one of calcium, zinc sterite, silane, siloxane, silane siloxane, methyl silane, methyl siloxane, methyl silane siloxane, trioctyl silane, and trioctyl siloxane.

The admixture may be mixed during the production of white portland cement or during the mixing of the concrete composition. The silane admixture, such as silane and trioctyl silan, is smaller in monomer size than the siloxane admixture, so that the water repellent performance is improved to the interior of the concrete composition. It can be secured.

Concrete structure using the concrete composition according to an embodiment of the present invention, the reflectance is preferably 0.6 or more.

Concrete structure using the concrete composition of the present invention can be used as a barrier, median, curb or road structure to ensure the visibility of the driver.

The material and the compounding ratio of the present invention ensure the driver's visibility, and also improve the water repellency and fouling resistance of the structure.

The aggregate mixed in the present invention uses aggregates such as limestone, dolomite limestone, igneous rock, etc. Among them, dolomite limestone is most easily used to secure visibility.

In order to improve the fouling resistance and chemical resistance of the composition, admixtures may be mixed, and 0.001 to 0.03 parts by weight of the pigment may be further mixed based on the weight of the white portland cement to adjust the whiteness of the composition.

Table 1 below shows the mixing ratio of the concrete composition according to the Examples and Comparative Examples of the present invention.

division Unit material amount (kg / ㎥) Functional admixture Water reducing agent water existing
White portland cement White portland cement Slag Fine aggregate thick
aggregate Igneous rock Dolomite Limestone Concrete composition Example 1 96 300 1031 917 0.7 Example 2 112 350 987 877 0.7 Example 3 135 400 932 829 0.7 Example 4 144 280 120 921 819 0.7 Example 5 144 200 200 921 819 0.7 Example 6 135 400 932 829 0.4 0.7 Example 7 135 400 932 829 0.6 0.7 Example 8 139 400 904 877 0.7 Comparative example 160 400 899 799 0.7

The aggregate mixed in the Examples and Comparative Examples used aggregates satisfying the KS standard, the existing cement mixed in the Comparative Example is ordinary portland cement, the white Portland cement mixed in Examples 1-8 is white (Hunter method, WHITENESS) 85-96 cement was mixed.

Table 2 below is a test result for the compressive strength, water absorption, durability, salt resistance of the concrete composition of the present invention.

Durability index is measured based on KS F 2456 [Test method of resistance of concrete to rapid freezing and melting], and salt resistance is tested according to KS F 4930 [Liquid absorption absorber for concrete surface coating].

Penetration depth is a measure of the depth of penetration of chloride from the surface of the concrete specimen to the interior.

division Air volume
(%) Compressive strength (MPa) Water absorption
(%, 24h) durability
Indices(%) Salt Resistance (mm) 3 days 7 days 28 days



Concrete composition Example 1 5.1 12.1 21.2 34.5 100 86.1 9.1 Example 2 5.0 20.0 35.2 45.2 100 87.1 9.3 Example 3 5.8 31.8 41.1 51.2 100 87.3 9.5 Example 4 4.8 25.5 35.9 45.8 100 87.9 9.0 Example 5 4.5 21.1 32.2 43.1 100 88.0 9.2 Example 6 4.5 31.6 43.1 49.6 5 93.2 1.3 Example 7 4.5 30.5 41.0 48.5 2 97.1 1.2 Example 8 5.5 37.4 45.6 52.1 100 88.3 9.1 Comparative Example 1 4.8 31.8 36.9 40.8 100 86.0 10

Air volume affects the workability of concrete. Test Results The results of the comparative examples and the examples were confirmed to be similar. The 7-day compressive strength of the embodiment is somewhat lower than the comparative example, but when confirming the 28-day compressive strength it can be seen that the embodiment implements a higher strength than the comparative example.

Absorption rate indicates the rate of absorption for 24 hours using a 50ml capacity of Karsten tube, it can be confirmed that the absorption in all the examples without the functional admixture.

Penetration depth can be seen that the performance is improved when the water repellent is added.

Table 3 shows the results of measuring the whiteness and reflectivity of the examples and the comparative examples. The whiteness and the reflectance were analyzed using a conventional colorimeter.

In the case of whiteness, the test was carried out according to KS L 5113 [Portland Cement Whiteness Test Method].

As shown in Table 3, whiteness and reflectance are the results derived based on the existing color difference meter.

As a result of the test, it was confirmed that the concrete composition of the present invention secured a whiteness of about 80 and a reflectance of 0.6 or more even without adding a pigment.

division Whiteness Reflectance (dry, dry) Reflectivity (wet, rainy) D65 / 10 ° A / 2 ° D65 / 10 ° A / 2 °


concrete
Composition Example 1 80.71 0.65 0.66 0.41 0.41 Example 2 81.02 0.65 0.65 0.42 0.43 Example 3 81.41 0.66 0.67 0.43 0.44 Example 4 78.12 0.63 0.64 0.42 0.42 Example 5 77.03 0.60 0.60 0.38 0.38 Example 6 81.32 0.66 0.66 0.64 0.65 Example 7 81.11 0.66 0.66 0.65 0.65 Example 8 84.74 0.72 0.73 0.60 0.60 Comparative example 55.40 0.31 0.31 0.17 0.17

In addition, it was confirmed that the degree of mixing the water repellent does not significantly affect the whiteness.

Above all, it can be seen that the concrete composition of the present invention is at least twice as high in reflectivity as the comparative example using the existing Portland white Portland cement in the wet state.

The table below shows the results of checking the degree of whiteness according to white Portland cement and white Portland cement + slag.

division Whiteness L
(White / Black) a
(+ Red / -Green) b
(+ Yellow / -Blue) Common Portland
White portland cement 52.63 53.28 -0.72 7.78 Invention
White portland cement 90.50 91.27 -0.73 3.69 White Portland Cement (70%) + Slag (30) of the Invention 89.16 89.80 -0.51 3.65 White Portland Cement (50%) + Slag (50) of the Invention 88.74 89.36 -0.43 3.61

As a result, it can be seen that the white Portland cement mixed in the present invention is about 40% or more whiter than the conventional ordinary Portland cement.

Table 5 below is a result of measuring the whiteness of the dolomite limestone, it can be seen that the dolomite limestone is whiter than the crushed aggregate and instructor.

division Whiteness L
(White / Black) a
(+ Red / -Green) b
(+ Yellow / -Blue) Crushed aggregate (igneous rock) 75.25 75.65 -1.11 4.49 teacher 76.55 80.25 0.49 12.64 Dolomite Limestone 90.58 90.60 0 0.65

Claims (6)

12-19 wt% white portland cement;
4-9 weight% of water;
Fine aggregate 30-45 wt%;
Coarse aggregate 33-48 wt%; including,
Based on the white Portland cement weight,
0.001 to 0.03 parts by weight of admixture is further mixed,
The white Portland cement has a whiteness (hunter method, WHITENESS) of 85 to 96,
The white portland cement is
Mixed with either fly ash, silica fume or waste glass,
The mixing ratio of any one of the white Portland cement and the fly ash, silica fume or waste glass is 95: 5 ~ 50: 50,
The fly ash, silica fume. The waste glass has a whiteness (hunter method, WHITENESS) of 80 to 90, the visibility improved concrete composition.
delete delete The method of claim 1,
The admixture is
The visibility improvement concrete composition, characterized in that any one of calcium, zinc sterite, silane, siloxane, trioctylsilane, trioctylsiloxane.
A concrete structure using the improved visibility concrete composition of claim 1,
The concrete structure is a concrete structure, characterized in that the reflectance is 0.6 or more.
The method of claim 5,
A concrete structure, characterized in that it is a firewall, median, curb or road structure.

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