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A kind of ultra-high performance concrete and preparation method thereof

An ultra-high performance, concrete technology, applied in the field of building materials, can solve problems such as hidden dangers of structural fire safety, threatening life and property safety, and reduced structural bearing capacity, and achieves improved anti-high temperature burst performance, reduced free water, and reduced steam. effect of stress

Active Publication Date: 2017-11-14
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, while the extremely dense microstructure unique to UHPC greatly improves the strength, it will inevitably bring huge hidden dangers to the fire safety of the structure. Falling, seriously threatening the safety of life and property

Method used

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  • A kind of ultra-high performance concrete and preparation method thereof
  • A kind of ultra-high performance concrete and preparation method thereof
  • A kind of ultra-high performance concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Example 1 is ultra-high-performance concrete 200HA2-D that is resistant to high-temperature bursting. The specific ratio is shown in Table 1. The curing method is: directly dry heat curing at 200°C for 2 days after removing the formwork + sealed and stored for 28 days.

Embodiment 2

[0067] Example 2 is ultra-high-performance concrete NW6-200HA2-D that is resistant to high-temperature bursting. The specific ratio is shown in Table 1. The curing method is: after demoulding, soak in water at room temperature for 6 days + dry heat curing at 200°C for 2 days + seal and store for 28 days.

Embodiment 3

[0068] Example 3 is ultra-high-performance concrete HW2-200HA2-D that is resistant to high-temperature bursting. The specific ratio is shown in Table 1. The curing method is: after demoulding, 90°C hot water curing for 2d+200°C dry heat curing for 2d+sealed storage until 28d .

[0069] The concrete ratio (kg / m3) of table 1 comparative example and each embodiment 3 ) and its corresponding maintenance procedures

[0070]

[0071] Each group of test examples of the above-mentioned comparative examples and each embodiment is three identical test pieces, and to get its generality during the analysis of experimental results,

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Abstract

The invention provides an ultrahigh-performance concrete and a preparation method thereof. The ultrahigh-performance concrete is prepared by uniformly mixing the following components in parts by weight: cementing material: 450-600 kg / m<3> of cement, 70-120 kg / m<3> of silica fume, 100-200 kg / m<3> of fly ash and 70-120 kg / m<3> of slag powder; aggregate: 550-650 kg / m<3> of fine aggregate and 800-1000 kg / m<3> of coarse aggregate; and a high efficiency water reducing agent with the water reducing rate of at least 15%, which accounts for 0.8-1.2 wt% of the cementing material. The water / cement ratio of the mixture formed by the cementing material, aggregate water is kept at 0.14-0.20. The coarse aggregate is introduced into the ultrahigh-performance concrete as one of the raw materials, and a dry heat curing mode is creatively utilized to enhance the high-temperature burst resistance and normal-temperature mechanical properties of the concrete. The technological approach is novel and reduces the cost. The curing process is simple and convenient, and is convenient for engineering popularization.

Description

technical field [0001] The invention relates to the technical field of building materials in civil engineering, in particular to an ultra-high performance concrete and a preparation method thereof. Background technique [0002] Concrete has been a dominant material in building structures for more than a hundred years. With the rise of a large number of high-rise / ultra-high-rise buildings, long-span bridges, port airports and other architectural forms, ultra-high performance concrete ( Ultra-High-Performance Concrete, UHPC) came into being. [0003] However, while the extremely dense microstructure unique to UHPC greatly improves the strength, it will inevitably bring huge hidden dangers to the fire safety of the structure. fall, seriously threatening the safety of life and property. [0004] Published studies have shown that the mechanism of UHPC cracking under high temperature mainly includes the vapor pressure mechanism and thermal stress mechanism, and the former plays...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04B28B11/24
CPCB28B11/245C04B28/04C04B2201/52C04B18/146C04B18/08C04B18/067C04B14/06C04B14/068C04B14/048C04B14/04C04B14/28
Inventor 朋改非尚亚杰牛旭婧曾庆鹏赵怡琳
Owner BEIJING JIAOTONG UNIV
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