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CRST II type slab ballastless track CA mortar and preparation process thereof

A slab-type ballastless track and mortar technology is applied in the field of high-speed railway construction engineering materials. effect, improved volume stability, improved frost resistance performance

Inactive Publication Date: 2019-10-08
易树德
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] During the operation and management of the CRTSII ballastless track of the high-speed railway, it was found that the current CA mortar structure is prone to water, and the poor compatibility between the components in the CA mortar and cement leads to uneven quality and poor stability of the CA mortar structure. CA mortar is also prone to surface shrinkage, volume settlement and other problems. The CA mortar structure in such a ballastless track is prone to damage, mainly manifested in cracks and delamination. These damages have brought high-speed railway transportation. certain risk
Moreover, the existing CA mortar production process is prone to flooding and poor fluidity, which will also affect the uniformity of the structural quality of CA mortar, resulting in poor structural stability and low strength of CA mortar

Method used

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  • CRST II type slab ballastless track CA mortar and preparation process thereof
  • CRST II type slab ballastless track CA mortar and preparation process thereof

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Experimental program
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Effect test

preparation example Construction

[0029] In the above-mentioned experimental scheme, the preparation method of modified asphalt may comprise the following steps:

[0030] (1) Add asphalt to a high-speed kneader, heat up to 170-190°C, add SBS and SIS, knead for 5-10min, and then transfer to a grinder for grinding to obtain modified asphalt;

[0031] (2) Mix and stir emulsifier, sucrose, sodium carboxymethylcellulose, zinc dialkyldithiophosphate, rheological additives and deionized water evenly, continue to add hydroxymethylcellulose ether, polycarboxylic acid series Water reducer and gelatin, ultrasonic 1-3h at 800W power, then grind by grinder, add pH adjuster, mix and stir evenly to obtain emulsion;

[0032] (3) Mix the modified asphalt obtained in step (1) and the emulsion obtained in step (2) uniformly, and prepare emulsified modified asphalt through an emulsification device;

[0033] (4) Add SBR emulsion to the emulsified modified asphalt obtained in step (3), and mix uniformly by stirring and static mixe...

Embodiment 1

[0051] Weigh cement: 40kg, sand: 36kg, water: 13kg, modified asphalt: 11kg, micro-nano material: 6kg, fly ash: 2kg, liquid plastic expansion agent: 2.5kg, lignocellulose: 1kg, efficient water reduction Agent: 0.8kg, high clay: 0.5kg, thickener: 0.05kg, calcium oxide clinker: 0.2kg, magnesium oxide: 0.1kg, dextrin: 0.02kg, cellulose ether: 0.01kg, aluminum powder: 0.01kg , Air-entraining agent: 0.001kg, defoamer: 0.001kg.

[0052] First mix cement, sand, micro-nano materials, fly ash, lignocellulose, high clay, calcium oxide clinker, magnesium oxide, dextrin and aluminum powder in proportion to prepare CA mortar dry powder;

[0053] Then add liquid plastic expansion agent, high-efficiency water reducer, thickener, cellulose ether, air-entraining agent, defoamer and modified asphalt to the water and stir evenly, and then add the CA mortar dry powder prepared in step 1, Stir well to get CA mortar.

Embodiment 2

[0055] Weigh cement: 55kg, sand: 47kg, water: 16kg, modified asphalt: 28kg, micro-nano material: 13kg, fly ash: 7kg, liquid plastic expansion agent: 4kg, lignocellulose: 4kg, superplasticizer : 2kg, high clay: 2kg, thickener: 0.1kg, calcium oxide clinker: 0.68kg, magnesium oxide: 0.23kg, dextrin: 0.08kg, cellulose ether: 0.04kg, aluminum powder: 0.03kg, entrained air Agent: 0.005kg, defoamer: 0.003kg.

[0056] First mix cement, sand, micro-nano materials, fly ash, lignocellulose, high clay, calcium oxide clinker, magnesium oxide, dextrin and aluminum powder in proportion to prepare CA mortar dry powder;

[0057] Then add liquid plastic expansion agent, high-efficiency water reducer, thickener, cellulose ether, air-entraining agent, defoamer and modified asphalt into the water and stir evenly, then add the CA mortar dry powder prepared earlier, and stir evenly Get CA Mortar.

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Abstract

The invention relates to the technical field of high-speed railway construction engineering materials, in particular to CRST slab ballastless track CA mortar and a preparation method thereof. The CRSTslab ballastless track CA mortar is prepared from the following components of cement, sand, water, modified asphalt, micro nano materials, fly ash, a liquid plastic expansion agent, lignocellulose, ahigh-efficiency water reducer, high clay, a thickener, calcium oxide clinker, magnesium oxide, dextrins, cellulose ethers, aluminum powder, an air entraining agent and a defoamer; firstly the cement,the sand, the micro nano materials, the fly ash, the lignocellulose, the high clay, the calcium oxide clinker, the magnesium oxide, the dextrins and the aluminum powder are mixed to prepare CA mortardry powder; secondly, the liquid plastic expansion agent, the high-efficiency water reducer, the thickener, the cellulose ethers, the air entraining agent, the defoamer and the modified asphalt are added into water sequentially and stirred evenly, then the CA mortar dry powder prepared first is added and mixed evenly to obtain the CA mortar. The CA mortar is not easy to soak in water, the stability is good, and phenomena of cracks, stratification and the like are not prone to appearing.

Description

technical field [0001] The invention relates to the technical field of high-speed railway construction engineering materials, in particular to a CA mortar for a CRST slab ballastless track and a preparation method thereof. Background technique [0002] In recent years, China's high-speed railway has developed rapidly, and the ballastless track structure has also been widely used. Among them, the CRTSII slab ballastless track system has absorbed the advantages of good integrity of the sleeper-embedded ballastless track and the convenience of slab track manufacturing and construction. , pay attention to the accuracy of manufacturing, laying and measurement, and ensure the smoothness and stability of the track structure, which is an important form of ballastless track structure. As an important part of the main filling material of CRTSII ballastless track of high-speed railway, CA mortar has been widely used, such as Beijing-Tianjin, Beijing-Shanghai, Shanghai-Hangzhou and othe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B111/34C04B111/27
CPCC04B28/00C04B2111/27C04B2111/346C04B14/06C04B22/002C04B24/36C04B20/008C04B18/08C04B2103/0068C04B24/383C04B2103/302C04B14/10C04B2103/44C04B22/064C04B22/066C04B22/04C04B2103/304C04B2103/50
Inventor 易树德
Owner 易树德