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High-density concrete and preparation method thereof

A dense concrete and ultra-fine cement technology, applied in the field of concrete, can solve the problems of easy erosion and freeze-thaw damage, low concrete density, etc., and achieve the effect of reducing water permeability coefficient, reducing porosity and increasing strength

Active Publication Date: 2018-09-14
UNIV OF JINAN
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems of low density of concrete in the prior art and easy occurrence of erosion and freeze-thaw damage during marine engineering service, the present invention provides a method for preparing high-density concrete with easy-to-obtain raw materials, simple method and convenient implementation

Method used

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  • High-density concrete and preparation method thereof

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Effect test

Embodiment 1

[0026] (1) Preparation of superfine cement: Mix 400 parts by weight of ordinary cement, 50 parts by weight of sericite powder, 5 parts by weight of sodium stearate and 40 parts by weight of beet pulp, and grind them in a ball mill for 20 minutes to obtain superfine cement. The fineness of cement is 600m 2 / kg. The cement used is Portland cement with a fineness of 320m 2 / kg. The pear pomace used is the dry residue left after extracting pear juice, with a fineness of 500m 2 / kg, the sugar content is 2%.

[0027] (2) Preparation of modified gangue: Grind the gangue to a fineness of 300m 2 / kg, soak in 30% sodium hydroxide solution for 8 hours, rinse and dry. Then calcined at 550° C. for 4 hours to obtain modified coal gangue.

[0028] (3) Preparation of pore blocking agent: Mix 300 parts by weight of water-soluble polyurethane, 60 parts by weight of ethyl acetate, 5 parts by weight of 2,4-dihydroxybenzamide and 55 parts by weight of carboxymethylcellulose.

[0029] (4) Pr...

Embodiment 2

[0031] (1) Preparation of superfine cement: Mix 450 parts by weight of ordinary cement, 30 parts by weight of sericite powder, 10 parts by weight of sodium stearate and 40 parts by weight of beet pulp, and grind them in a ball mill for 40 minutes to obtain superfine cement. The fineness of cement is 700m 2 / kg. The cement used is Portland cement with a fineness of 350m 2 / kg. The pear pomace used is the dry residue left after extracting pear juice, with a fineness of 600m 2 / kg, the sugar content is 5%.

[0032] (2) Preparation of modified gangue: Grind the gangue to a fineness of 345m 2 / kg, soak in 30% sodium hydroxide solution for 12 hours, rinse and dry. Then calcined at 750° C. for 2 hours to obtain modified coal gangue.

[0033] (3) Preparation of pore blocking agent: Mix 340 parts by weight of water-soluble polyurethane, 85 parts by weight of ethyl acetate, 10 parts by weight of 2,4-dihydroxybenzamide and 40 parts by weight of carboxymethyl cellulose.

[0034] (4...

Embodiment 3

[0036] (1) Preparation of ultra-fine cement: Mix 410 parts by weight of ordinary cement, 35 parts by weight of sericite powder, 7 parts by weight of sodium stearate and 50 parts by weight of beet pulp, and grind them in a ball mill for 25 minutes to obtain superfine cement. The fineness of cement is 677m 2 / kg. The cement used is Portland cement with a fineness of 321m 2 / kg. The pear pomace used is the dry residue left after extracting the pear juice, with a fineness of 550m 2 / kg, the sugar content is 3%.

[0037] (2) Preparation of modified gangue: Grind the gangue to a fineness of 320m 2 / kg, soak in 30% sodium hydroxide solution for 9 hours, rinse and dry. Then calcined at 590° C. for 2.5 hours to obtain modified coal gangue.

[0038] (3) Preparation of pore blocking agent: Mix 320 parts by weight of water-soluble polyurethane, 70 parts by weight of ethyl acetate, 7 parts by weight of 2,4-dihydroxybenzamide and 45 parts by weight of carboxymethyl cellulose.

[0039...

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Abstract

The invention provides high-density concrete. The high-density concrete is prepared from 220-270 parts of superfine cement, 180-230 parts of modified coal gangue, 15-35 parts of hole plugging agent, 740-800 parts of sand, 1,100-1,300 parts of pebbles and 100-160 parts of water. The superfine cement is prepared from 400-450 parts of cement, 30-50 parts of sericite powder, 5-10 parts of sodium stearate and 40-85 parts of sugar beet pulp. The sugar beet pulp is residues obtained after sugar beet root tubers and stems are soaked and squeezed to extract sugar liquid, the fineness ranges from 500 m<2> / kg to 600 m<2> / kg, and the sugar mass percentage content ranges from 2% to 5%. The porosity of the prepared concrete is reduced by about 12% to 35%, meanwhile, the strength is improved by 5% to 15%, and the 90-day water permeability coefficient is reduced by 10% to 35%.

Description

technical field [0001] The invention belongs to the technical field of concrete, and in particular relates to a high-density concrete and a preparation method thereof. Background technique [0002] Since the advent of Portland cement in the 1920s, cement concrete has been widely used in marine projects such as docks, cross-sea bridges, and island and reef projects due to its wide source of raw materials, strong adaptability, and low price. However, concrete itself is a porous structure of gas-liquid-solid three-phase, which is prone to erosion and freeze-thaw damage when it is in service in marine engineering. Therefore, it is necessary to provide the compactness of concrete itself to improve its durability. At present, the following methods are mainly used to achieve high-density concrete: (1) Adjust the concrete mix ratio and reduce the water-cement ratio. Although it can reduce the pores caused by the mixing water to a certain extent, it seriously affects the working perf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B20/04C04B20/02C04B24/38C04B7/02C04B7/24C04B18/12C04B111/27
CPCC04B7/02C04B7/24C04B20/04C04B28/04C04B40/0039C04B2111/27C04B2201/50C04B22/00C04B24/085C04B24/001C04B24/045C04B24/124C04B24/383C04B24/282C04B14/06C04B14/02C04B18/12C04B20/023C04B20/026Y02W30/91Y02P40/10
Inventor 宫晨琛吴波芦令超
Owner UNIV OF JINAN
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