CA (cement and asphalt) mortar for CRTS II slab ballastless tracks

A slab ballastless track and mortar technology, applied in the field of CA mortar, can solve the problems of short application time of CRTS Ⅱ slab ballastless track, insufficient research on formula and influencing factors, etc., to improve compressive strength and flexural strength, The effect of small loss of expansion and fluidity and good workability

Inactive Publication Date: 2011-04-13
中铁八局集团第四工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the short application time of CRTS Ⅱ slab ballastless track in China, the

Method used

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  • CA (cement and asphalt) mortar for CRTS II slab ballastless tracks
  • CA (cement and asphalt) mortar for CRTS II slab ballastless tracks
  • CA (cement and asphalt) mortar for CRTS II slab ballastless tracks

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Preparation of emulsified asphalt: prepare materials by weight, add 1.8 parts of emulsifier, 0.3 part of suspending agent, 0.3 part of stabilizer, 0.6 part of polycarboxylate water reducer to 39 parts of water at 65 °C, and 58.0 parts of 70 parts heated to 125 °C No. base asphalt is added to the emulsifier together, and the emulsified asphalt is obtained through shear emulsification. The polycarboxylate superplasticizer in the emulsified asphalt has a reduced solid content of 0.29%. Its performance indicators are shown in Table 3:

[0022] Table 3 Performance indicators of emulsified asphalt

[0023]

[0024] Preparation of cement asphalt mortar: by weight, add 8.72 parts of water, 1.28 parts of P emulsion, 11.54 parts of emulsified asphalt, 0.77 parts of melamine water reducer, and 0.2 parts of defoamer into the mixer at a speed of 30 rpm Stir for 30 seconds, increase the speed to 120 rpm, then add 25.65 parts of cement, 51.33 parts of sand, 0.51 parts of expansio...

Embodiment 2

[0030] Preparation of emulsified asphalt: prepare materials by weight, add 1.8 parts of emulsifier, 0.3 part of suspending agent, 0.3 part of stabilizer and 0.8 part of polycarboxylate water reducer to 39 parts of water at 65 ° C, and 57.8 parts of 70 parts heated to 125 ° C No. base asphalt is added to the emulsifier together, and the emulsified asphalt is obtained through shear emulsification. The polycarboxylate superplasticizer in the emulsified asphalt has a solid content of 0.38%, and its performance indicators are shown in Table 5:

[0031] Table 5 Performance indicators of emulsified asphalt

[0032]

[0033]

[0034] Preparation of cement asphalt mortar: by weight, add 7.78 parts of water, 1.30 parts of P emulsion, 11.66 parts of emulsified asphalt, 0.78 parts of melamine water reducer, and 0.21 parts of defoamer into the mixer at a speed of 30 rpm Stir for 30 seconds, increase the speed to 120 rpm, then add 25.92 parts of cement, 51.83 parts of sand, 0.52 part...

Embodiment 3

[0039] Preparation of emulsified asphalt: prepare materials by weight, add 1.8 parts of emulsifier, 0.3 part of suspending agent, 0.3 part of stabilizer, and 1.0 part of polycarboxylate water reducer to 39 parts of water at 65 ° C, and 57.6 parts of 70 parts heated to 125 ° C No. base asphalt is added to the emulsifier together, and the emulsified asphalt is obtained through shear emulsification. The polycarboxylate superplasticizer in the emulsified asphalt has a reduced solid content of 0.48%. Its performance indicators are shown in Table 7:

[0040] Table 7 Performance indicators of emulsified asphalt

[0041]

[0042]Preparation of cement asphalt mortar: by weight, add 7.54 parts of water, 1.30 parts of P emulsion, 11.69 parts of emulsified asphalt, 0.78 parts of melamine water reducer, and 0.21 parts of defoamer into the mixer at a speed of 30 rpm Stir for 30 seconds, increase the speed to 120 rpm, then add 25.99 parts of cement, 51.97 parts of sand, 0.52 parts of ex...

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PUM

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Abstract

The invention provides CA (cement and asphalt) mortar for CRTS II slab ballastless tracks, aiming to ensure the CA mortar to have better working performance and compression and breaking strength. The invention is characterized in that the polycarboxylic acid water reducer with water reduction quantity toward CA mortar cement being 0.13-0.22% is mixed in emulsified asphalt in the emulsifying process and the melamine water reducer with water reduction quantity toward CA mortar cement being 0.21-0.22% is admixed in the process of blending the emulsified asphalt and mortar. The invention has the following beneficial effects: the dispersion degree and fluidity of the mortar have lower losses; the CA mortar has good working performance; and the compression and breaking strength of the CA mortar are effectively improved.

Description

technical field [0001] The invention discloses a CA mortar used for CRTS II slab ballastless track. Background technique [0002] With the rapid development of our high-speed railway, due to the advantages of good stability, high durability, uniform stiffness and less maintenance, the slab ballastless track will be widely used in high-speed railway, urban railway and subway projects. Therefore, the market prospect of CA mortar necessary for slab ballastless track is very broad. [0003] CA mortar is the emulsified asphalt cement mortar poured in the gap between the rigid track and the concrete track bed during the construction of the slab track to form a homogeneous, rigid and elastic filling cushion. The CA mortar layer can adjust the geometric accuracy and The dual function of absorbing vibration and impact energy. CA mortar is composed of cement, emulsified asphalt, sand and various additives. It is an organic, inorganic and composite material that is cemented and harde...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B24/12C04B103/30
Inventor 赵勇尚宗康叶昌林倪俊邱长军邢利娟黄跃东冉华毛成张玉蓉
Owner 中铁八局集团第四工程有限公司
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