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A pumice-based lightweight self-compacting ultra-high performance concrete and its preparation method

An ultra-high-performance, self-compacting technology, which is applied to ceramic products, other household appliances, household appliances, etc., can solve the problems of large discreteness, reduced mechanical properties of concrete, and high brittleness, so as to broaden the application field and alleviate the environment and ecology Problems, effects of good homogeneity

Active Publication Date: 2022-05-06
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ordinary pumice light aggregate concrete is prone to: (1) The quality of the upper and lower parts of the concrete caused by the floating of light pumice has poor homogeneity and large dispersion
(2) The porous structure of pumice itself provides a new channel for the transmission and diffusion of substances or ions, which will cause a certain degree of deterioration to the compactness and durability of concrete
(3) The pumice itself has low strength and high brittleness, and the concrete specimens formed by the failure of the light aggregate itself are prone to failure under stress conditions, resulting in a significant decrease in the mechanical properties of concrete
Therefore, there are still many difficulties in incorporating pumice light aggregate into the design of self-compacting UHPC cement-based material system

Method used

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  • A pumice-based lightweight self-compacting ultra-high performance concrete and its preparation method
  • A pumice-based lightweight self-compacting ultra-high performance concrete and its preparation method
  • A pumice-based lightweight self-compacting ultra-high performance concrete and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A pumice-based lightweight self-compacting ultra-high performance concrete, which consists of powder, aggregate and water reducer, the powder is P152.5 cement (Huaxin Cement Co., Ltd., Huangshi), Class I fly ash (Huaneng Yangluo Power Plant, Wuhan), micro-silica fume (Donglanxing Technology Development Co., Ltd., Chengdu), aggregates are natural river sand (Wuhan) and water-absorbing pumice (Changbai Mountain), and the water-reducing agent is polycarboxylic acid-type water-reducing agent ( Jiangsu Subote New Material Co., Ltd., Nanjing); among them, the particle size distribution of river sand is 0.6mm-1.5mm, the particle size distribution of water-absorbing pumice is 0-0.6mm, the porosity is 35%-55%, and the water-absorbing The rate is 35%; before water absorption treatment, the pumice density is 0.6kg / m 3 ~1.1kg / m 3 .

[0045] The preparation method of the above-mentioned pumice-based lightweight self-compacting ultra-high performance concrete, the specific steps ar...

Embodiment 2

[0064] The difference between Example 2 and Example 1 is that the particle size distribution of the river sand is 0-0.6mm; the particle size distribution of the water-absorbing pumice is 0-1.3mm, and the particle size of the pumice is 0-0.6mm in the total mass of the pumice 85%, the pumice water absorption rate is 40%, and the volume fraction of pumice replacing river sand is 95% to 99%; other related raw materials used, design, preparation and testing methods are consistent with embodiment 1.

[0065] The mixing ratio of UHPC2 prepared in Example 2 is shown in Table 4. The performance of UHPC2 fresh slurry is shown in Table 5, the durability test results of UHPC2 specimens are shown in Table 6, and the development of mechanical properties is shown in Table 5. Figure 4 , the cross-sectional morphology of hardened cement stone is shown in Figure 5 .

[0066] Table 4 UHPC2 mix ratio (kg / m 3 )

[0067]

[0068] Table 5 UHPC2 fresh slurry properties

[0069]

[0070] ...

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Abstract

The invention provides a pumice-based lightweight self-compacting ultra-high performance concrete (UHPC) and a preparation method thereof. The preparation method can significantly reduce the apparent density of UHPC freshly mixed slurry and improve The fluidity of slurry belongs to the technical field of UHPC. The preparation method proposed by the invention is based on the close packing model of the component particles, pre-wets the pulverized pumice particles to a certain degree, and replaces the river sand at a certain volume fraction to prepare the UHPC composite cement-based material. The preparation method provided by the invention can prepare an apparent density of 2000kg / m 3 Below, the fluidity is more than 300mm, the strength is more than 110MPa, and it is a plain UHPC with good homogeneity, volume stability and impermeability.

Description

technical field [0001] The invention belongs to the technical field of ultra-high-performance concrete (UHPC), and in particular relates to a pumice-based lightweight self-compacting ultra-high-performance concrete and a preparation method thereof. Background technique [0002] As an important part of transportation, bridges are the "nutrition channel" for the rapid development of the national economy. In recent years, with the development of bridge technology, long-span, light weight and high durability have become the new direction of modern bridge development. The self-weight of the steel-concrete bridge structure accounts for about 30% to 60% of the total design load, and the larger the span, the higher the proportion of its self-weight. How to effectively reduce the self-weight of the bridge has become a hot spot in bridge construction. The self-weight of the bridge is a function of the volume of the beam body, the concrete density and the amount of steel, as shown in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B38/08C04B111/40
CPCC04B28/04C04B38/08C04B2201/50C04B2201/20C04B2111/40C04B18/08C04B18/146C04B14/068C04B14/14C04B2103/302
Inventor 水中和刘开志余睿
Owner WUHAN UNIV OF TECH
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