Ultra-high performance concrete prepared from modified volcanic limestone powder

A volcanic ash, ultra-high performance technology, applied in the field of building materials, can solve the problems of high quality, increase the preparation cost, limit the application scope of ultra-high performance concrete, etc., achieve high strength, promote ion dissolution, and improve competitiveness.

Active Publication Date: 2021-05-11
乌兰浩特市圣益商砼有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cementitious materials required for the preparation of ultra-high performance concrete are generally of high quality, which

Method used

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  • Ultra-high performance concrete prepared from modified volcanic limestone powder
  • Ultra-high performance concrete prepared from modified volcanic limestone powder
  • Ultra-high performance concrete prepared from modified volcanic limestone powder

Examples

Experimental program
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preparation example Construction

[0028] 3. Preparation of volcanic ash powder:

[0029] The volcanic ash powder of 3mm among the present invention is made by three-stage crushing, specifically comprises following three-stage crushing:

[0030] Step S1, putting the volcanic ash rock into a jaw crusher, and crushing the volcanic ash rock particles with a particle size of less than 300 mm.

[0031] Step S2, further crushing the volcanic ash particles obtained in step S1 with a cone crusher to obtain small volcanic ash particles with an average particle size of less than 30 mm.

[0032] Step S3, crushing the small volcanic ash particles obtained in step S2 into a volcanic ash powder with a particle size of 3 mm using a compactor.

[0033] The volcanic ash powder in the following examples are all prepared by the above method.

Embodiment 1

[0037] An ultra-high-performance concrete prepared by using modified volcanic ash powder, comprising the following components in parts by weight:

[0038]

[0039] After the above-mentioned components were mixed and stirred for 2-3 minutes, ultra-high performance concrete was obtained, and the ultra-high performance concrete obtained in this embodiment was subjected to performance tests of expansion degree, retention and compressive strength, and the performance test results were shown in the table 1.

[0040] Specifically, the surface area of ​​slag powder is 300-350m 2 / kg, water content not more than 1%, loss on ignition not more than 2%. The average particle size of silica fume is 1-3μm, and the bulk density is 1650-1750kg / m 3 ; Wherein, the mass of silica fume whose particle size is less than 1 μm is 80% of the mass of silica fume. The activity index of metakaolin is greater than 110, the loss on ignition is less than 0.7%, and the average particle size is 10-μm. Q...

Embodiment 2

[0045] An ultra-high-performance concrete prepared by using modified volcanic ash powder, comprising the following components in parts by weight:

[0046]

[0047]

[0048] After the above-mentioned components were mixed and stirred for 2-3 minutes, ultra-high performance concrete was obtained, and the ultra-high performance concrete obtained in this embodiment was subjected to performance tests of expansion degree, retention and compressive strength, and the performance test results were shown in the table 1.

[0049] Specifically, the surface area of ​​slag powder is 300-350m 2 / kg, water content not more than 1%, loss on ignition not more than 2%. The average particle size of silica fume is 1-3μm, and the bulk density is 1650-1750kg / m 3 ; Wherein, the mass of silica fume whose particle size is less than 1 μm is 80% of the mass of silica fume. The activity index of metakaolin is greater than 110, the loss on ignition is less than 0.7%, and the average particle size ...

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Abstract

The invention discloses ultra-high performance concrete prepared from modified volcanic limestone powder. The ultra-high performance concrete is prepared from 52.5-grade Portland cement, modified volcanic limestone powder, slag powder, silica fume, metakaolin, quartz sand, a polycarboxylic water reducer, magnesium silicate, graphene oxide, polycarboxylic acid modified nano C-S-H and water. The modified volcanic limestone powder is utilized to enhance the characteristics of of the ultra-high performance concrete including good fluidity, high strength and low preparation cost, so that the popularity and market competitiveness of the ultra-high performance concrete prepared by the invention are favorably improved. Therefore, the ultra-high performance concrete prepared by the invention is concrete with high comprehensive performance.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to an ultra-high performance concrete prepared by using modified volcanic ash powder. Background technique [0002] Ultra-high performance concrete, referred to as UHPC, is widely favored by engineering applications and concrete material researchers for its ultra-high mechanical strength, ultra-high toughness and excellent durability. At present, the research work related to ultra-high performance concrete, such as UHPC performance indicators, test methods, application technical regulations, and standards for premix products are being gradually implemented. It is expected that ultra-high performance concrete will usher in more vigorous development. [0003] The raw materials for preparing ultra-high performance concrete mainly include portland cement, silica fume, slag powder, fly ash, quartz sand, steel fiber and admixtures of strength grade 52.5 and above. Among them...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B24/12C04B20/02C04B14/14
CPCC04B28/04C04B20/026C04B14/14C04B24/122C04B2201/50C04B18/141C04B18/146C04B14/106C04B14/06C04B2103/302C04B22/08C04B14/022C04B24/24Y02W30/91
Inventor 马跃飞高明星张皓孙振平冀言亮
Owner 乌兰浩特市圣益商砼有限公司
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