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Large-fluidity spread concrete and preparation method thereof

A concrete and fluidity technology, applied in the field of concrete materials, can solve the problems of inability to have both fluidity and slump retention properties of concrete, and achieve the effects of smooth and uniform paving quality, good dispersibility, and uniform and stable dispersed phase.

Active Publication Date: 2019-10-01
SHENZHEN MUNICIPAL DESIGN & RES INST +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a new type of sliding form paving which is between dry hard concrete and self-compacting concrete and combines the excellent performance of the two, which is easy to construct and low in cost, aiming at the slip form paving construction technology of prefabricated slab track base Concrete paving to solve the current technical problem that concrete fluidity and slump retention cannot be achieved at the same time

Method used

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  • Large-fluidity spread concrete and preparation method thereof
  • Large-fluidity spread concrete and preparation method thereof
  • Large-fluidity spread concrete and preparation method thereof

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Embodiment Construction

[0022] Embodiments of the invention are described in detail below, but the invention can be practiced in many different ways as defined and covered by the claims.

[0023] The mixing ratios of concrete examples 1-4 of the present invention and comparative examples 1-4 are shown in the following table 1, and the coarse aggregate of the concrete is mixed with low-alkali active mechanism crushed stones of two grades of 5-10mm and 10-16mm The fine aggregate is made of low-alkali active mechanism sand with a fineness modulus of 2.4-2.6, the water-binder ratio is 0.30-0.32, the sand ratio of the concrete is 42%, and the phosphorus content of starch phosphate is 4%. The solid content of the polycarboxylate high-efficiency water reducer is 15%, and the mass percent concentration of the air-entraining agent is 1%.

[0024] The preparation method is to mix and stir cement, pulverized coal, mineral powder, starch phosphate ester, ultrafine zeolite powder and gelatin to make a uniform dry...

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Abstract

The invention provides large-fluidity spread concrete and a preparation method thereof. The concrete includes 34-39 parts of cement, 17-20 parts of a mineral additive, 110-131 parts of coarse aggregate, 82-95 parts of fine aggregate, 15-19 parts of tap water, 1.6-2 parts of an admixture, and 0.7-1 part of a compound thixotropic agent, wherein the admixture is a polycarboxylic acid high-efficiencywater reducer and an air entraining agent, and the compound thixotropic agent is starch phosphate ester, ultra-fine zeolite powder and gelatin. The starch phosphate ester, the ultra-fine zeolite powder, the gelatin, the polycarboxylic acid high-efficiency water reducer and the air entraining agent are mixed with other raw materials to make the concrete endowed with large fluidity and excellent shape retention ability. The contradiction between the fluidity and the shape retention ability of the concrete is solved, and such problems are solved that at present, concrete over-vibration is causedby the adoption of high-frequency vibration to compact the low-fluidity concrete, aggregate settlement and segregation occur and the gas content is reduced. The construction performance of the concrete is greatly improved, the service life of the concrete is greatly prolonged in engineering, the spread quality is ensured, and the concrete can be spread more smoothly and uniformly.

Description

technical field [0001] The invention relates to the technical field of concrete materials, in particular to a large fluidity paving concrete and a preparation method thereof. Background technique [0002] The traditional track construction of the integral track bed of the subway adopts the method of manually fine-tuning the track and pouring concrete on site, which has many disadvantages such as slow construction progress, difficult quality control of cast-in-place concrete, high labor intensity, and harsh working environment. High-speed railway slab track has the advantages of factory prefabrication, on-site mechanized assembly, and convenient maintenance and replacement, and will become the main type of domestic track structure design in the future. With the rapid development of domestic precast concrete assembly industrialization and high-speed railway slab track, a new idea and model have been brought to the construction and development of subway track engineering. The a...

Claims

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Application Information

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IPC IPC(8): C04B28/00
CPCC04B28/00C04B2201/50C04B18/08C04B14/02C04B14/06C04B2103/302C04B2103/304C04B24/38C04B14/047
Inventor 王文通元强张锋姜晓文田连生黄艳玲吴永芳刘耀强朱鹏王跃跃
Owner SHENZHEN MUNICIPAL DESIGN & RES INST
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