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Low-temperature ultra-high performance concrete as well as preparation method and application thereof

An ultra-high performance, concrete technology, applied in manufacturing tools, building maintenance, ceramic molding machines, etc., can solve problems such as difficult construction of ultra-high performance concrete

Active Publication Date: 2021-07-02
BEIJING MUNICIPAL ENG RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a kind of low-temperature ultra-high performance concrete, the low-temperature ultra-high performance concrete provided by the present invention has higher fluidity under the low temperature environment (minimum temperature is -5 ℃), has higher strength and Excellent durability, which solves the problem of difficult construction of ultra-high performance concrete in low temperature environment (minimum temperature is -5°C)

Method used

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  • Low-temperature ultra-high performance concrete as well as preparation method and application thereof
  • Low-temperature ultra-high performance concrete as well as preparation method and application thereof
  • Low-temperature ultra-high performance concrete as well as preparation method and application thereof

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preparation example Construction

[0032] The present invention also provides a method for preparing low-temperature ultra-high performance concrete described in the above technical solution, comprising the following steps:

[0033] Mix cementitious materials, aggregates, mineral admixtures, water reducers, defoamers, early strength agents, retarders and antifreeze agents to obtain a concrete matrix;

[0034] After the concrete matrix is ​​mixed with water, slurry is obtained, and steel fibers are added into the slurry to obtain low-temperature ultra-high performance concrete.

[0035] The invention mixes the cementitious material, the aggregate, the mineral admixture, the water reducer, the defoamer, the early strength agent, the retarder and the antifreeze agent to obtain the concrete matrix. In the present invention, the mixing temperature is preferably -5-10°C, more preferably -5-5°C, more preferably -5-0°C. In the present invention, there is no special limitation on the way of mixing cementitious material...

Embodiment 1～4

[0040] Mix cementitious materials, aggregates, mineral admixtures, water reducers, defoamers, early strength agents, retarders and antifreeze agents at -5°C using a high-shear forced mixer to obtain a concrete matrix; Add water to the concrete matrix and stir for 6 minutes to obtain slurry, add steel fibers to the slurry, and continue stirring for 5 minutes to obtain low-temperature ultra-high performance concrete. Among them, the cementitious material is obtained by mixing 52.5 grade ordinary Portland cement, high belite sulfoaluminate cement and high alumina cement at a mass ratio of 7:2:1; the aggregate is quartz sand, and the particle size of quartz sand is The mass ratio of 20-40 mesh coarse quartz sand to 40-70 mesh fine quartz sand is 1:1.5; the mineral admixture is ultra-fine fly ash microbeads with a particle size of 1-5 μm; water reducer It is a polycarboxylate water reducer (PC-100 developed by Shanghai Yingshan New Material Technology Co., Ltd.); the defoamer is po...

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Abstract

The invention belongs to the technical field of ultra-high performance concrete, and particularly relates to low-temperature ultra-high performance concrete as well as a preparation method and application thereof. The low-temperature ultra-high performance concrete provided by the invention comprises a concrete matrix raw material and water; the concrete matrix raw material comprises, in parts by mass, 100 parts of a cementing material, 100 to 120 parts of aggregate, 20 to 30 parts of a mineral admixture, 0.4 to 0.6 part of a water reducing agent, 0.08 to 0.12 part of a de-foaming agent, 0.1 to 0.3 part of an early strength agent, 0.15 to 0.25 part of a set retarder, 0.1 to 0.5 part of an anti-freezing agent and 13 to 20 parts of steel fibers. The mass ratio of the water to the concrete matrix raw material is (0.08-0.115):1. Various preparation raw materials are compounded to synergistically improve the low-temperature performance of the low-temperature ultra-high-performance concrete, so that the low-temperature ultra-high-performance concrete has good fluidity, compressive strength, durability and construction quality.

Description

technical field [0001] The invention belongs to the technical field of ultra-high-performance concrete, and in particular relates to a low-temperature ultra-high-performance concrete and a preparation method and application thereof. Background technique [0002] With the research, application, innovation and development of cement-based materials, ultra-high-performance concrete (UHPC) has become an engineering material for industrial production and commercial supply, and its product types and application fields are expanding. UHPC structural design methods, construction technologies And standard specifications are also in the process of development, establishment and improvement. At present, the cementitious material of UHPC at room temperature on the market is ordinary Portland cement, and its performance indicators are: initial expansion degree of 710mm, 0.5h expansion degree of 690mm, and 1h expansion degree of 670mm; under standard maintenance, the strength of 1d is 90MP...

Claims

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Application Information

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IPC IPC(8): C04B28/06E04G23/02B28B1/52C04B111/70
CPCC04B28/06E04G23/0203B28B1/523C04B2201/50C04B2111/70C04B7/02C04B14/06C04B18/08C04B2103/302C04B2103/50C04B2103/10C04B2103/22C04B2103/601C04B14/48
Inventor 夏春蕾叶兴健丁连伟
Owner BEIJING MUNICIPAL ENG RES INST
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