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Nano ultrahigh-strength concrete with high impact resistance

A technology of ultra-high-strength concrete and high impact resistance, applied in the field of building materials, can solve the problem of fiber dispersion, the problem of concrete viscosity has not been well solved, etc., to reduce initial defects, improve weak interface performance, and improve deformation resistance. Effect

Inactive Publication Date: 2019-03-12
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the incorporation of fibers does not fundamentally change the generation of concrete cracks
In addition, the dispersion of fibers and the viscosity of concrete induced by them have not been well resolved.

Method used

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  • Nano ultrahigh-strength concrete with high impact resistance
  • Nano ultrahigh-strength concrete with high impact resistance
  • Nano ultrahigh-strength concrete with high impact resistance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0039] Table 1 Raw materials and parts by weight thereof

[0040]

[0041]Dynamic impact resistance to pressure performance: The impact compression test is carried out using a conventional separate Hopkinson (SHPB) device, and the test block size is a cylinder of Φ15.0mm×30.0mm. The three-wave method formula is used to process the collected waveforms, and the dynamic compressive strength is recorded as the dynamic strength performance of concrete; the peak strain and ultimate strain under the corresponding peak stress are recorded to reflect the deformation capacity of concrete. The impact toughness index is obtained by integrating the stress-strain curve, which is used to characterize the ability of the microwire composite RPC to absorb energy from loading to complete destruction; and the specific energy absorption is calculated by the formula, which characterizes the ability of the material to dissipate the stress wave energy per unit volume size.

[0042] Depend on im...

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Abstract

The invention discloses nano ultrahigh-strength concrete with high impact resistance. The nano ultrahigh-strength concrete is characterized by being prepared from the following raw materials: cement,nano particles, silica fume, coal ash, sand, a water reducer and water, wherein the nano particles are one of nano silicon oxide, nano titanium oxide or nano zirconium oxide. The nano particles (comprising nano silicon oxide, nano titanium oxide or nano zirconium oxide) can remarkably strengthen impact toughness and specific energy absorption of ultrahigh-strength concrete. When a strain rate is 280 / s to 645 / s, nano silicon oxide with high mixing amount can increase the specific energy absorption of the ultrahigh-strength concrete by 159.7%; and when a strain rate is 803 / s to 845 / s, the specific energy absorption of three nano ultrahigh-strength concrete can be increased to be 200% or above.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a nanometer ultra-high-strength concrete with high impact resistance. Background technique [0002] Ultra-high-strength concrete has been gradually used in bridges, high-rise buildings, military bunkers, and national defense and anti-explosion fields due to its ultra-high mechanical properties and wear resistance. As a brittle material, certain cracks will inevitably occur inside ultra-high-strength concrete, and its extremely low water-cement ratio (too high compactness) often aggravates the brittle nature of concrete. In addition, when the concrete used in actual engineering is subjected to dynamic loads caused by impacts, explosions, etc.: on the one hand, the parameters such as the strength and elastic modulus of the material will be greatly improved under the action of dynamic loads; on the other hand, the concrete The damage will also change with the action of t...

Claims

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Application Information

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IPC IPC(8): C04B28/04
CPCC04B28/04C04B18/146C04B18/08C04B14/06C04B2103/302C04B14/062C04B14/305C04B14/306
Inventor 韩宝国王佳亮董素芬
Owner DALIAN UNIV OF TECH
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