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A kind of low temperature ultra high performance concrete and its preparation method and application

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

Active Publication Date: 2022-07-26
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)

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  • A kind of low temperature ultra high performance concrete and its preparation method and application
  • A kind of low temperature ultra high performance concrete and its preparation method and application
  • A kind of low temperature ultra high performance concrete and its preparation method and application

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preparation example Construction

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

[0033] Mix cementitious material, aggregate, mineral admixture, water reducing agent, defoamer, early strength agent, retarder and antifreeze to obtain concrete matrix;

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

[0035] The present invention mixes cementitious material, aggregate, mineral admixture, water reducing agent, defoaming agent, early strength agent, retarder and antifreezing agent to obtain concrete matrix. In the present invention, the temperature of the mixing is preferably -5 to 10°C, more preferably -5 to 5°C, and more preferably -5 to 0°C. The present invention does not specifically limit the method of mixing the cementitious materia...

Embodiment 1～4

[0040] Mix the cementitious material, aggregate, mineral admixture, water reducing agent, defoamer, early strength agent, retarder and antifreeze at -5°C using a high shear forced mixer to obtain a concrete matrix; Adding water to the concrete matrix and stirring for 6 minutes to obtain a slurry, adding steel fibers to the slurry, and continuing to stir for 5 minutes to obtain a low-temperature ultra-high performance concrete. Among them, the cementitious material is 52.5 grade ordinary Portland cement, high belite sulfoaluminate cement and high alumina cement mixed with a mass ratio of 7:2:1; the aggregate is quartz sand, and the quartz sand has a medium particle size. The mass ratio of 20-40 mesh coarse quartz sand and 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 reducing agent It is a polycarboxylate water reducing agent (PC-100 developed by Shanghai Yingshan New Material Technology Co., L...

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Abstract

The invention belongs to the technical field of ultra-high-performance concrete, and particularly relates to a low-temperature ultra-high-performance concrete and a preparation method and application thereof. The low-temperature ultra-high performance concrete provided by the present invention includes concrete matrix raw materials and water; in parts by mass, the concrete matrix raw materials include 100 parts of cementitious materials, 100-120 parts of aggregates, 20-30 parts of mineral admixtures, 0.4-0.6 part of water reducing agent, 0.08-0.12 part of defoamer, 0.1-0.3 part of early strength agent, 0.15-0.25 part of retarder, 0.1-0.5 part of antifreeze and 13-20 part of steel fiber; the water and The mass ratio of concrete matrix raw materials is (0.08-0.115):1. The invention adopts a variety of preparation raw materials to composite, and synergistically improves the low-temperature performance of the low-temperature ultra-high-performance concrete, so that it 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 particularly 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 constantly expanding. UHPC structural design methods, construction technology As well as standard specifications are also in the process of development, establishment and improvement. At present, the normal temperature UHPC cementing material on the market is ordinary Portland cement, and its performance indicators are: initial expansion degree 710mm, 0.5h expansion degree 690mm, 1h expansion degree 670mm; 1d strength under standard curing 90MPa, 3 days strength 10...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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