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RPC cover plate for subway evacuation platform and preparation method of RPC cover plate

An evacuation platform and cover plate technology, applied in the field of concrete, can solve the problems of poor toughness, high consumption of RPC cementitious materials, inconsistent hydration process of cementitious materials, etc., to improve toughness and volume stability, and inhibit the generation of microscopic cracks , the effect of inhibiting the expansion of macroscopic crack powder

Pending Publication Date: 2021-07-02
陕西黄峪工程材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1) The matrix is ​​highly brittle and easily cracked and damaged after being impacted and collided;
[0005] 2) The amount of fiber is high, and steel fiber is mainly used. Steel fiber is easy to rust, which affects appearance and performance;
[0006] 3) Dark color, poor appearance quality
[0007] The amount of RPC cementitious material is high, there are many components, and the water-binder ratio is low, resulting in a darker color; the hydration process of various cementitious materials is inconsistent, and the appearance has a certain color difference; steel fiber is used, and the surface of the steel fiber is prone to bleeding and bleeding. The enrichment of water leads to a higher local water-binder ratio, resulting in fiber texture on the surface of RPC products
[0008] To sum up, there are problems in the production and application of RPC cover plates such as poor toughness, steel fibers are easy to rust, and the appearance is difficult to control.

Method used

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  • RPC cover plate for subway evacuation platform and preparation method of RPC cover plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The raw materials of the RPC cover plate 1 used for the subway evacuation platform include 700 parts by weight of cement, 300 parts of ultrafine mineral powder, 200 parts of silica fume, 800 parts of quartz sand, 100 parts of modified wollastonite powder, polyoxymethylene fiber 10 parts, 30 parts of glass fiber, 0.5 part of polyacrylonitrile fiber, 20 parts of polycarboxylate water reducer, 1 part of brightener and 200 parts of water.

[0051] Among them, the above cement is low C 3 A 52.5 grade ordinary portland cement; the specific surface area of ​​silica fume used is 20000m 2 / kg, SiO 2 The content is 95%; the ultrafine mineral powder used is S95 grade,

[0052] In the above-mentioned quartz sand, the silica content is ≥96%; and the quartz sand is composed of three particle sizes, namely: 0.1mm≤particle size<0.2mm, 0.2mm≤particle size<0.5mm and 0.5mm≤particle size≤ 1.65mm; their weight ratio is 3:5:2.

[0053] The diameter of the polyoxymethylene fiber is 0.2mm,...

Embodiment 2

[0073] The preparation method of this embodiment is basically the same as that of Example 1, and the difference in the raw materials for the RPC cover plate 2 of the subway evacuation platform is:

[0074] The raw materials of the RPC cover plate 2 used for the subway evacuation platform include 750 parts by weight of cement, 100 parts of ultrafine mineral powder, 200 parts of silica fume, 800 parts of quartz sand, 300 parts of modified wollastonite powder, polyoxymethylene fiber 20 parts, 50 parts of glass fiber, 1 part of polyacrylonitrile fiber, 25 parts of polycarboxylate water reducing agent, 1.5 parts of brightener and 210 parts of water.

[0075] Wherein, the above-mentioned modified wollastonite powder is prepared by the following method

[0076] a. Stir the wollastonite powder at a constant temperature of 60°C for 10 minutes;

[0077] b. Then the silane coupling agent is mixed with ethanol to obtain a mixed solution; wherein, the silane coupling agent consumption is ...

Embodiment 3

[0083] The preparation method of this embodiment is basically the same as that of Example 1, and the difference in the raw materials for the RPC cover plate 3 of the subway evacuation platform is:

[0084] The raw materials of the RPC cover plate 3 used for the subway evacuation platform include 600 parts by weight of cement, 100 parts of microbeads, 100 parts of kaolin-based reinforcing agent, 200 parts of silica fume, 900 parts of quartz sand, and 150 parts of modified wollastonite powder. 25 parts of polyoxymethylene fiber, 45 parts of glass fiber, 1.5 parts of polyacrylonitrile fiber, 30 parts of polycarboxylate water reducer, 2 parts of brightener and 190 parts of water.

[0085] Wherein, the above-mentioned modified wollastonite powder is prepared by the following method

[0086] a. Stir the wollastonite powder at a constant temperature of 60°C for 10 minutes;

[0087] b. Then the silane coupling agent is mixed with ethanol to obtain a mixed solution; wherein, the amoun...

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Abstract

The invention discloses an RPC cover plate for a subway evacuation platform and a preparation method of the RPC cover plate. The RPC cover plate comprises the raw materials in parts by weight: 500 to 1000 parts of cement, 250 to 600 parts of mineral admixture, 700 to 1200 parts of quartz sand, 50 to 400 parts of modified wollastonite powder, 10 to 30 parts of polyformaldehyde fibers, 10 to 50 parts of glass fibers, 0.2 to 2 parts of organic fibers, 10 to 40 parts of a polycarboxylic acid type water reducing agent, 0.2 to 2 parts of a brightening agent and 150 to 250 parts of water. Through the synergistic toughening effect of the wollastonite and the multi-scale hybrid fibers of the steel fibers, the expansion of ultra-high-performance macroscopic crack powder and the generation of micro cracks can be inhibited, and the toughness and the volume stability of the concrete are greatly improved. Meanwhile, the wollastonite powder is high in color whiteness, and the color and appearance of the concrete can be improved.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to an RPC cover plate used for a subway evacuation platform and a preparation method thereof. Background technique [0002] Reactive powder concrete (RPC) is the most innovative cement composite matrix material developed in the past 20 years. Its design and preparation are mainly based on the theory of the closest packing of particles, by reducing porosity, improving microstructure, increasing homogeneity, and improving toughness. Compared with ordinary cement-based materials, RPC has ultra-high strength, high toughness and excellent durability, which can well meet the needs of civil engineering for lightweight, high-rise, long-span and high durability. Structures, thin-walled structures, architectural decoration, marine engineering, restoration and reinforcement engineering and other fields have broad and extensive application prospects. [0003] The subway RPC evacuation platfo...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B14/04C04B24/22B28B1/087B28B11/24B28B13/02B28C5/00C04B111/34
CPCC04B28/04C04B40/0039C04B14/043B28B13/02B28B1/087B28B11/245B28C5/003C04B2201/50C04B2111/343
Inventor 姜斌黄正强全国兴潘兴良王立周俊刘涛张斌张鑫
Owner 陕西黄峪工程材料有限公司
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