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Damping and buffering polypropylene concrete material and preparation method thereof

A technology of concrete and water reducing agent, which is applied in the field of concrete materials, can solve the problems of poor cohesion of freshly mixed concrete material slurry, affect the mechanical properties of concrete materials, and the combination is not easy to achieve tightness, so as to achieve compact structure, improve bond strength, The effect of enhancing binding ability

Inactive Publication Date: 2021-11-19
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When EPP particles are used as building materials and mixed with concrete material mortar, it should be noted that EPP particles are organic particles with hydrophobic surface, while cement paste is an inorganic cementitious material, so in the preparation process, the combination of the two It is not easy to achieve compactness, and it is easy to have the problem of poor cohesion of fresh concrete material slurry
In addition, since EPP particles are foaming materials, their light weight can easily cause uneven density distribution during the mixing and molding process of concrete materials, and even the phenomenon of EPP particles floating up, which seriously affects the mechanical properties of concrete materials.

Method used

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  • Damping and buffering polypropylene concrete material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0032] A tunnel shock-absorbing and buffering EPP concrete material, prepared according to the following raw material consumption:

[0033] Primary EPP particles with a particle size of 3-5mm: 0.11 parts; content of 99% triethanolamine modifier: 0.003 parts; medium sand: 93.6 parts; ordinary Portland cement with a strength grade of 42.5: 45.7 parts; Stone: 61.3 parts; water: 21 parts; polysulfuric acid superplasticizer: 0.46 parts.

[0034] The preparation method of tunnel shock-absorbing buffer EPP concrete material comprises the following steps:

[0035] (a) EPP modified paste treatment: take by weighing 3% of the modifier solution of the EPP particle mass, evenly spray on the surface of the EPP particle, and stir at a constant speed; after the EPP particle is completely infiltrated by the modifier, then use It is the nucleus, and slowly sprinkle cement cementitious material with 3 times the mass of EPP into it, and fully stir it to form a "core-shell structure".

[0036] ...

Embodiment 2

[0042] A tunnel shock-absorbing and buffering EPP concrete material, prepared according to the following raw material consumption:

[0043] Primary EPP particles with a particle size of 3-5mm: 0.22 parts; content of 99% triethanolamine modifier: 0.006 parts; medium sand: 93.6 parts; ordinary Portland cement with a strength grade of 42.5: 45.7 parts; Stone: 46 parts; water: 21 parts; polysulfuric acid superplasticizer: 0.46 parts.

[0044] The preparation method of tunnel shock-absorbing buffer EPP concrete material comprises the following steps:

[0045] (a) EPP modified paste treatment: take by weighing 3% of the modifier solution of the EPP particle mass, evenly spray on the surface of the EPP particle, and stir at a constant speed; after the EPP particle is completely infiltrated by the modifier, then use It is the nucleus, and slowly sprinkle cement cementitious material with 3 times the mass of EPP into it, and fully stir it to form a "core-shell structure".

[0046] (b) ...

Embodiment 3

[0052] A tunnel shock-absorbing and buffering EPP concrete material, prepared according to the following raw material consumption:

[0053] Primary EPP particles with a particle size of 3-5mm: 0.34 parts; content of 99% triethanolamine modifier: 0.010 parts; medium sand: 93.6 parts; ordinary Portland cement with a strength grade of 42.5: 45.7 parts; Stone: 30.6 parts; water: 21 parts; polysulfuric acid superplasticizer: 0.46 parts.

[0054] The preparation method of tunnel shock-absorbing buffer EPP concrete material comprises the following steps:

[0055] (a) EPP modified paste treatment: take by weighing 3% of the modifier solution of the EPP particle mass, evenly spray on the surface of the EPP particle, and stir at a constant speed; after the EPP particle is completely infiltrated by the modifier, then use It is the nucleus, and slowly sprinkle cement cementitious material with 3 times the mass of EPP into it, and fully stir it to form a "core-shell structure".

[0056] ...

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Abstract

The invention discloses a damping and buffering polypropylene concrete material and a preparation method thereof. The damping and buffering polypropylene concrete material is prepared from the following components in parts by weight: 0.11 to 0.56 part of EPP particles, 0.003 to 0.017 part of modifier, 93.6 parts of medium sand, 45.7 parts of Portland cement, 0 to 61.3 parts of gravel, 21 parts of water, 2.29 to 6.86 parts of mica powder and 0.46 part of water reducing agent. A series of EPP concrete materials with certain strength, low apparent density and large deformation are obtained by replacing aggregate in a concrete material matrix with EPP particles according to different proportions and adding mica powder with different contents, and meanwhile, the defects that the affinity between the surfaces of the EPP particles in the EPP concrete material and an inorganic cementing material is small, interface bonding strength is low, and the bonding force with cement mortar is weak can be eliminated.

Description

technical field [0001] The invention belongs to the technical field of concrete materials, and relates to shock-absorbing and buffering materials for tunnel engineering, in particular to a shock-absorbing and buffering polypropylene concrete material and a preparation method thereof. Background technique [0002] Earthquake, a sudden natural disaster, has huge destructive energy, and its damage to underground engineering cannot be ignored. The severe impact vibration inside the structure caused by strong earthquakes can easily cause damage to tunnel lining, falling off and internal equipment damage. Compared with ground structures, the seismic research of underground structures is still relatively weak, and the research on seismic buffer layers of tunnels also has a long way to go. At present, the commonly used anti-seismic methods mainly rely on strengthening the stiffness of the tunnel lining structure and improving the stiffness of the surrounding rock to resist the shock...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B38/08C04B20/10C04B111/20C04B111/40C04B111/52C04B16/08
CPCC04B28/04C04B20/1022C04B2111/2046C04B2111/40C04B2111/52C04B2111/00724C04B2201/20C04B2201/50C04B16/082C04B14/20C04B14/02C04B14/06C04B2103/302
Inventor 路军富肖钦文王明胜郑长青汤印谭进义刘锋邹建国张宏鑫
Owner CHENGDU UNIVERSITY OF TECHNOLOGY