Fair-faced concrete

Abstract

The bare concrete is prepared from the following raw materials in parts by weight: 250 to 290 parts of cement, 156 to 158 parts of water, 837 to 915 parts of machine-made sand, 926 to 946 parts of stones, 80 to 100 parts of fly ash, 7.3 to 8.3 parts of an additive, 0.5 to 1.5 parts of fibers and 4 to 20 parts of iron oxide black. The advantages of high strength, deep color and good color fixing performance are realized.

Description

Technical Field

[0001] The invention relates to the technical field of building materials, in particular to a kind of plain concrete. Background Art

[0002] Fair-faced concrete refers to a cast-in-place concrete project that uses the original concrete casting surface or the concrete surface treated with a transparent protective agent as the outer surface, and achieves an aesthetic effect through the natural color and texture of the concrete and the appearance quality of the carefully designed construction. The two most critical points of fair-faced concrete are one-time pouring and no external decoration. In recent years, fair-faced concrete has been increasingly used in industrial and civil construction projects.

[0003] The biggest difference between fair-faced concrete and ordinary concrete is that fair-faced concrete does not have the protective layer of decorative materials on the surface of ordinary concrete and is exposed to the external environment for a long time, directly affected by the corrosion of the external environment. Its appearance is mostly light gray, and it is easy to discolor after long-term use. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by this patent application is how to provide a kind of fair-faced concrete with high strength, deep color and good color fixing performance.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A kind of plain concrete is prepared from the following raw materials in parts by weight: 250-290 parts of cement, 156-158 parts of water, 837-915 parts of machine-made sand, 926-946 parts of gravel, 80-100 parts of fly ash, 7.3-8.3 parts of admixture, 0.5-1.5 parts of fiber and 4-20 parts of black iron oxide.

[0007] As an optimization, the cement is P·O42.5r ordinary Portland cement.

[0008] As an optimization, the machine-made sand is medium sand.

[0009] As an optimization, the gravel is continuously graded from 5 to 16 mm and after water washing, the mud content is less than 1%.

[0010] As an optimization, the fly ash is of Class F II, and its water requirement ratio is ≤100%.

[0011] As an optimization, the admixture is a polycarboxylate water reducer.

[0012] As an optimization, the fiber is polypropylene fiber.

[0013] As an optimization, the iron oxide black adopts Shanghai Yipin 353 series.

[0014] In summary, the present invention can form plain concrete with different color depths on the architectural color card by adding the amount of black iron oxide, and the P·O42.5r ordinary Portland cement has high strength, fast strength development and strong stability, which ensures the strength and color stability of the product under long-term use. DETAILED DESCRIPTION

[0015] The present invention is further described in detail below. In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "upper, lower" and "top, bottom" are usually directions or positional relationships, which are only for the convenience of describing the present invention and simplifying the description. In the absence of any contrary description, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the contour of each component itself.

[0016] Embodiment 1:

[0017] A kind of plain concrete is prepared from the following raw materials in parts by weight: 250 parts of cement, 156 parts of water, 837 parts of machine-made sand, 926 parts of gravel, 80 parts of fly ash, 7.3 parts of admixture, 0.5 parts of fiber and 4 parts of black iron oxide.

[0018] The cement mentioned above is P·O42.5r ordinary Portland cement; the machine-made sand is medium sand; the gravel is 5-16mm continuously graded, and after water washing, the mud content is less than 1%; the fly ash is F class II, and its water requirement ratio is ≤100%; the admixture is polycarboxylate water reducer; the fiber is polypropylene fiber; the iron oxide black adopts Shanghai Yipin 353 series.

[0019] Embodiment 2:

[0020] A kind of plain concrete is prepared from the following raw materials in parts by weight: 290 parts of cement, 158 parts of water, 915 parts of machine-made sand, 946 parts of gravel, 100 parts of fly ash, 8.3 parts of admixture, 1.5 parts of fiber and 20 parts of black iron oxide.

[0021] The cement mentioned above is P·O42.5r ordinary Portland cement; the machine-made sand is medium sand; the gravel is 5-16mm continuously graded, and after water washing, the mud content is less than 1%; the fly ash is F class II, and its water requirement ratio is ≤100%; the admixture is polycarboxylate water reducer; the fiber is polypropylene fiber; the iron oxide black adopts Shanghai Yipin 353 series.

[0022] Embodiment 3:

[0023] A kind of plain concrete is prepared from the following raw materials in parts by weight: 280 parts of cement, 157 parts of water, 906 parts of machine-made sand, 943 parts of gravel, 100 parts of fly ash, 7.6 parts of admixture, 1.0 part of fiber and 8.0 parts of black iron oxide.

[0024] The cement mentioned above is P·O42.5r ordinary Portland cement; the machine-made sand is medium sand; the gravel is 5-16mm continuously graded, and after water washing, the mud content is less than 1%; the fly ash is F class II, and its water requirement ratio is ≤100%; the admixture is polycarboxylate water reducer; the fiber is polypropylene fiber; the iron oxide black adopts Shanghai Yipin 353 series.

[0025] Compared with the above embodiments, Embodiment 1 is white, and has poor roughness and gloss; Embodiment 2 is dark in color, which affects the presentation of surface texture and gloss; Embodiment 3 is strong, ensures color fixation, and meets the requirements of roughness and gloss.

[0026] Finally, it should be noted that those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A kind of plain concrete, characterized in that: The invention is prepared from the following raw materials in parts by weight: 250-290 parts of cement, 156-158 parts of water, 837-915 parts of machine-made sand, 926-946 parts of gravel, 80-100 parts of fly ash, 7.3-8.3 parts of admixture, 0.5-1.5 parts of fiber and 4-20 parts of black iron oxide.

2. The plain concrete according to claim 1, characterized in that: The cement is P·O42.5r ordinary Portland cement.

3. The plain concrete according to claim 1, characterized in that: The machine-made sand is medium sand.

4. The plain concrete according to claim 1, characterized in that: The gravel is of continuous grading of 5-16 mm and has a mud content of less than 1% after being washed.

5. The plain concrete according to claim 1, characterized in that: The fly ash is of Class F II, and its water requirement ratio is ≤100%.

6. The plain concrete according to claim 1, characterized in that: The admixture is a polycarboxylate water reducer.

7. The plain concrete according to claim 1, characterized in that: The fibers are polypropylene fibers.