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High-efficiency admixture of subway shield segments, preparation method and use method thereof

A shield segment and admixture technology, applied in the field of building materials, can solve the problems of increasing the construction cost of the subway shield segment, long mold turnaround time, and difficulty in geometric dimension deviation, so as to improve the mold turnover efficiency and solve the surface problem. Many bubbles, good early strength effect

Inactive Publication Date: 2013-09-11
四川路加四通科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The water reducing agents currently used on the segments are naphthalene-based, melamine-based, polycarboxylic acid-based, etc. When these products are used on the segments, some of them will obviously have many bubbles on the surface, roughness, and dull and uneven color. Some have poor early strength and early setting effects, long mold turnover time, and poor volume stability. It is difficult to meet the requirement that the geometric dimension deviation of the subway shield segment is less than 1mm, and this type of water reducing agent is expensive, which greatly improves the subway shield. Construction cost of structural segments

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] First, slowly add 0.40 parts of carboxymethylcellulose (parts by weight, the same below) to 32.7 parts of water, stir to fully dissolve it, then add 48 parts of carboxylate water reducer and 14 parts of naphthalenesulfonate formaldehyde condensate continuously Stir and mix, mix well and let stand for 2 hours, finally add 4.5 parts of triethanolamine and 0.40 parts of simethicone and stir for 0.5 hours to prepare a high-efficiency subway shield segment admixture, mixed with naphthalene-based admixture and polycarboxylic acid Compared with the subway shield segment of admixture (the mixing amount is 0.5% of the quality of the concrete glue material), the subway shield segment (the mixing amount is 0.5% of the quality of the concrete glue material) of the product of the present invention is statically The stop time is reduced by 51% and 29% respectively, and the demoulding time is reduced by 30% and 15% respectively, and the surface is smooth and free of bubbles, while the ...

Embodiment 2

[0027] First, slowly add 0.15 parts of carboxymethyl cellulose to 34.6 parts of water, stir to fully dissolve it, then add 42 parts of carboxylate water reducer and 20 parts of naphthalenesulfonate formaldehyde condensate and keep stirring and mixing. Set it aside for 3 hours, and finally add 3.0 parts of triethanolamine and 0.25 parts of dimethyl silicone oil and stir for 0.8 hours to obtain a high-efficiency subway shield segment admixture, which is mixed with a naphthalene-based admixture and a polycarboxylic acid-based admixture. Segment (mixing amount is 1.0% of the quality of concrete adhesive material) compares, and the static stop time of the subway shield segment (mixing amount is 1.0% of the quality of concrete adhesive material) that mixes the product of the present invention reduces respectively 42% and 16%, the demoulding time was reduced by 24% and 7.2% respectively, and the surface was smooth and free of bubbles, while the subway shield segment mixed with naphtha...

Embodiment 3

[0029] First, slowly add 0.05 parts of carboxymethyl cellulose to 35.4 parts of water, stir to fully dissolve it, then add 35 parts of carboxylate water reducer and 28 parts of naphthalenesulfonate formaldehyde condensate and keep stirring and mixing, mix well and then static Set aside for 4 hours, and finally add 1.5 parts of triethanolamine and 0.06 parts of dimethyl silicone oil and stir for 0.5 hours to obtain a high-efficiency subway shield segment admixture, which is mixed with a naphthalene-based admixture and a polycarboxylic acid-based admixture for the subway shield. Compared with the segment (the blending amount is 1.5% of the quality of the concrete glue material), the static stop time of the subway shield segment (the blending amount is 1.5% of the quality of the concrete glue material) mixed with the product of the present invention is respectively reduced by 36% and 7%, the demoulding time is reduced by 19% and 2% respectively, and the surface is smooth and free ...

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PUM

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Abstract

The invention discloses a high-efficiency admixture for subway shield segments, a preparation method and a use method thereof. The admixture is prepared by the following components in parts by weight: 30-50 parts of carboxylate water-reducing agent, 10-30 parts of JF-2 high-efficiency water-reducing agent, 0.05-0.5 part of defoaming agent dimethyl silicon oil, 1-5 parts of early-strength agent triethanolamine and 0.01-0.4 part of carboxymethyl cellulose admixture processed under certain process conditions. The admixture has the advantages of low cost, high water-reducing ratio, good early-strength and early-solidification effects, short mold-turnround time, good volume stability of prepared concrete and compact surface with fewer bubbles, and is an high-efficiency admixture for the subway shield segments.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a high-efficiency subway shield segment admixture and a preparation and use method thereof. Background technique [0002] The quality requirements of the subway shield segment are the requirements of fair-faced concrete. Fair-faced concrete is one-time molding without any external decoration. It needs to have a smooth surface, uniform color, sharp edges and corners, and no damage or pollution. Its characteristics represent the highest form of expression in concrete materials, and what it embodies is the taste of being plain, unpretentious, natural and steady. In addition, due to the reduction of plastering time and static stop time, shortening of steam curing time, and faster production speed of the segment during the production process, it is required that the admixture has the properties of early strength and early setting, especially the admixture should not have ai...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/38
Inventor 卫强
Owner 四川路加四通科技发展有限公司
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