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Preparation method and application of dry powder mortar for asphalt carbon fiber cement-based self-compacting concrete of slab ballastless track

A technology of slab ballastless track and pitch carbon fiber, which is applied in the field of building materials, can solve performance problems, achieve the effects of reducing surface energy, improving affinity and cohesion, and increasing dispersibility

Active Publication Date: 2020-05-19
浙江省通用砂浆研究院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen from the above prior art that in order to reduce the cost of self-compacting mortar, it is possible to seek low-cost substitutes for mortar raw materials, but the performance of self-compacting mortar will vary due to the difference in the performance of substitutes, so it is necessary to seek the best low-cost substitute. It is very necessary to prepare self-compacting mortar with stable and excellent performance

Method used

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  • Preparation method and application of dry powder mortar for asphalt carbon fiber cement-based self-compacting concrete of slab ballastless track

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A preparation method of dry powder mortar for asphalt carbon fiber cement-based self-compacting concrete of slab ballastless track comprises the following steps:

[0026] (1) Oxidize the pitch carbon fiber in the air at 360°C for 1h, then impregnate it in a toluene solution containing 0.5% epoxy resin for 30min, take it out, dry and solidify it at 100°C for 20min, and obtain a high degree of crystallite orientation Pretreated pitch carbon fiber with a carbon content of more than 90% and a carbon content higher than 99.8%.

[0027] (2) The rubber powder is further pulverized through a 100-mesh sieve, and then spread evenly. After being activated by low-temperature plasma for 1 min at a power of 300W, it is soaked in 0.2% aqueous solution of silane coupling agent KH-550 for 30 min. Dry and solidify for 20 minutes to obtain activated rubber powder.

[0028] (3) According to parts by weight, stir 0.5 parts of pitch carbon fiber and 1 part of active rubber powder to dispers...

Embodiment 2

[0030] A preparation method of dry powder mortar for asphalt carbon fiber cement-based self-compacting concrete of slab ballastless track comprises the following steps:

[0031] (1) Oxidize the pitch carbon fiber in the air at 400°C for 2h, then immerse it in a toluene solution containing 1% epoxy resin for 60min, take it out, dry and solidify it at 110°C for 30min, and obtain a crystallite orientation degree higher than 90%, pretreated pitch carbon fiber with a carbon content higher than 99.8%.

[0032](2) The rubber powder is further pulverized through a 150-mesh sieve, then spread evenly, and after being activated by low-temperature plasma for 3 minutes at a power of 500W, it is soaked with 0.5% silane coupling agent KH-550 aqueous solution for 30-60min, Dry and solidify at ℃ for 30 minutes to obtain activated rubber powder.

[0033] (3) According to parts by weight, stir 0.5 parts of pitch carbon fiber and 5 parts of active rubber powder to disperse the two evenly to form...

Embodiment 3

[0035] A preparation method of dry powder mortar for asphalt carbon fiber cement-based self-compacting concrete of slab ballastless track comprises the following steps:

[0036] (1) Oxidize the pitch carbon fiber in the air at 380°C for 1.5h, then impregnate it in a toluene solution containing 0.6% epoxy resin for 40min, take it out, dry and solidify it at 105°C for 25min, and obtain a high degree of crystallite orientation Pretreated pitch carbon fiber with a carbon content of more than 90% and a carbon content higher than 99.8%.

[0037] (2) The rubber powder is further pulverized through a 110-mesh sieve, and then spread evenly. After being activated by low-temperature plasma for 2 minutes at a power of 400W, it is impregnated with 0.3% silane coupling agent KH-550 aqueous solution for 45 minutes. Dry and solidify for 25 minutes to obtain activated rubber powder.

[0038] (3) According to parts by weight, stir 0.05 parts of pitch carbon fiber and 3 parts of active rubber p...

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Abstract

The invention provides preparation and application of dry-mixed mortar for asphalt carbon fiber cement-based self-compaction concrete of a slab ballastless track. A specific preparation method comprises the following steps: oxidizing asphalt carbon fibers in the air and carrying out immersion treatment in a toluene solution containing epoxy resin to obtain pre-treated asphalt carbon fibers; crushing rubber powder; activating by low-temprature plasma and treating by utilizing a silane coupling agent water solution to obtain activated rubber powder; stirring the asphalt carbon fibers and the activated rubber powder to form a mixed modifier; after slowly stirring cement, a mineral admixture and fine aggregate, adding the mixed modifier, a water-reducing and slump-loss-reducing component, a foaming component and an adhesive aggregation regulator in sequence; rapidly stirring to obtain the dry-mixed mortar for the asphalt carbon fiber cement-based self-compaction concrete of the slab ballastless track. The dry-mixed mortar for the self-compaction concrete, prepared by the preparation method, has excellent elasticity and modulus and low temperature lasting quality and can be used for thefields of slab ballastless tracks, transportation track engineering, building engineering and the like.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a preparation method and application of dry powder mortar for slab-type ballastless track asphalt carbon fiber cement-based self-compacting concrete. Background technique [0002] With the rapid development of my country's high-speed railway construction technology, the non-jaw track has been widely used and developed. Ordinary concrete has defects such as poor ductility, low tensile strength, large shrinkage deformation, and brittle failure. Compared with ordinary concrete, self-compacting high-performance concrete has higher fluidity, and there will be no segregation and bleeding during the pouring process. It can fill the formwork only by its own weight, avoiding the original defects of hardened concrete, and has excellent performance. Excellent durability and good mechanical properties, so the work performance and durability are excellent, so that the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C04B20/10C04B14/38C04B38/10C04B24/24
CPCC04B14/386C04B20/1022C04B20/1037C04B24/24C04B28/00C04B38/10C04B2111/0075C04B2201/50C04B18/08C04B18/141C04B18/146C04B14/068C04B18/027C04B14/06C04B24/2641C04B24/10C04B22/148C04B22/06C04B24/383C04B24/00
Inventor 汤薇蒋晓燕李果孙秋砚
Owner 浙江省通用砂浆研究院
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