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Ultralow-color-difference concrete based on heavy calcium powder and preparation method of ultralow-color-difference concrete

A heavy calcium powder and concrete technology, which is applied in the field of building materials, can solve the problems of uneven color difference in the appearance of concrete, black oil stains on the surface of concrete, color difference in concrete surface, etc., and achieve the effect of satisfying the decorative effect, uniform appearance, and easy vibration construction

Inactive Publication Date: 2022-05-31
GUANGDONG PROVINCIAL CHANGDA HIGHWAY ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, fly ash is usually used as an admixture in concrete, but due to the difference in coal quality, fly ash can easily cause color difference in concrete, and some fly ash can even cause black floating objects in concrete, which is extremely unfavorable to the appearance, and P The admixtures contained in the cement are also likely to cause color difference on the concrete surface, and sometimes local black oil stains appear on the concrete surface
Of course, the mixing time, the performance of the admixture, and the cleanliness of the formwork will also cause uneven color difference in the appearance of concrete.

Method used

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  • Ultralow-color-difference concrete based on heavy calcium powder and preparation method of ultralow-color-difference concrete
  • Ultralow-color-difference concrete based on heavy calcium powder and preparation method of ultralow-color-difference concrete
  • Ultralow-color-difference concrete based on heavy calcium powder and preparation method of ultralow-color-difference concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] A preparation method of ultra-low chromatic aberration concrete based on heavy calcium powder, comprising the steps:

[0083] Material preparation steps: Weigh the following components according to the formula ratio: cement, granulated blast furnace slag powder, crushed stone, sand, liquid water, solid ice, heavy calcium powder, special admixtures, and spare;

[0084] Mixing step: In the forced concrete mixer, the mortar-covered stone mixing process of secondary feeding is adopted. When mixing concrete, the feeding sequence is: firstly put the formula amount of sand, the formula amount of solid ice, and the formula amount of solid ice into the mixer. 70% of liquid water and special admixtures of the formula, cement of the formula, slag powder of the formula, heavy calcium powder of the formula, then put the crushed stone of the formula, and finally add 30% of the remaining formula. Water is mixed, the mixing power of the mixer meets the requirements of GB / T 9142-2000 "C...

Embodiment 2

[0092] The formula composition of the ultra-low chromatic aberration concrete of the present embodiment is shown in Table 2.

[0093] Table 2 C35 column mix ratio design scheme

[0094]

[0095] Test the concrete according to Table 2, the bulk density is 2385kg / m 3 , bleeding rate 0%, slump 205mm, expansion 560mm, 1h slump 200mm, 2h slump 200mm, 3h slump 190mm, good cohesion, 7d compressive strength 46.5 MPa.

[0096] The demoulding effect of the column of Example 2 is shown in figure 2 , image 3 , Figure 4 , The appearance is uniform in color, no bubbles, and the finishing effect is very good. And 28d is basically free of carbonation, indicating that the concrete structure of the column is dense, and there is CO in the air. 2 Failed to enter to form carbonization, see the on-site carbonization test Figure 5 . Ten columns were randomly selected on site, and the springback results and carbonization results are shown in Table 3.

[0097] Table 3 C35 column random...

Embodiment 3

[0100] In order to better show the application range of adding heavy calcium powder, the mixing ratio of Example 3 is shown in Table 4. The on-site construction renderings of Example 3 are shown in Image 6 .

[0101] Table 4 Design scheme of C30 pier-column mix ratio

[0102]

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Abstract

The invention discloses ultra-low color difference concrete based on heavy calcium carbonate powder. The ultra-low color difference concrete comprises the following components in percentage by weight: 200-450 kg / m < 3 > of cement, 0-150 kg / m < 3 > of slag powder, 1000-1200 kg / m < 3 > of gravel, 700-800 kg / m < 3 > of sand, 150-180 kg / m < 3 > of liquid water, 0-80 kg / m < 3 > of solid ice, 70-150 kg / m < 3 > of heavy calcium carbonate powder and 0.8-5.0 kg / m < 3 > of a special additive. The invention further discloses a preparation method of the ultra-low color difference concrete based on the heavy calcium powder. Through reasonable proportion design, the poured concrete is uniform in appearance color, free of bubbles and very good in facing effect, the effect of bare concrete can be achieved without modification, the facing effect of a bridge structure is met, and high-added-value utilization is provided for heavy calcium carbonate powder and granulated blast furnace slag powder solid waste; the cement consumption is reduced, so that carbon emission is reduced, and low-carbon concrete is prepared; in a three-phase system of heavy calcium powder, granulated blast-furnace slag powder and cement, the machine-made sand can be applied to bridge facing concrete with higher concrete appearance requirements, and the application range of the machine-made sand is further widened.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to an ultra-low color difference concrete based on heavy calcium powder and a preparation method thereof. Background technique [0002] The pouring of fair-faced concrete, while ensuring the construction quality, forms a good effect of fair-face finish. The requirements and inspection methods for the color, repair, air bubbles and smoothness of the surface of fair-faced concrete in "Technical Regulations for the Application of Fair-faced Concrete" JGJ 169-2009 are carried out. regulations. The uneven color, color difference and smoothness of general concrete structures are the main diseases of fair-faced concrete, and the accompanying repair and air bubbles are also the main factors restricting the development of fair-faced concrete. [0003] The main reason for the bubbles is that the concrete itself has poor fluidity, which is not conducive to vibrating. The air bubbl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B18/141C04B14/02C04B14/06C04B14/28C04B24/226C04B24/2623C04B24/16C04B24/06C04B24/10Y02W30/91
Inventor 何涛汪一格荣国城郭广银谭立心蔡炎标刘程洪董自前
Owner GUANGDONG PROVINCIAL CHANGDA HIGHWAY ENG
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