Water-resistance-excellent cement emulsified asphalt mortar used for plate-type ballastless track

A technology of slab ballastless track and cement emulsified asphalt, which is applied in the field of cement emulsified asphalt mortar, can solve the problems of high water absorption, poor water resistance, and threats to the safe operation of high-speed railways, and achieve good fluidity and stability, suitable mechanical properties, Excellent water resistance and durability

Active Publication Date: 2014-12-17
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the emulsified asphalt involved in these invention patents or patent applications contains more non-ionic emulsifiers, which not only increases the hydrophilicity of cement emulsified asphalt mortar, but also increases the porosity of cement emulsified asphalt mortar, making it High water absorption rate, poor water resistance
Therefore, none of the technical solutions proposed in the above-mentioned patents can solve the problem of the hydrophilicity of the cement-emulsified asphalt mortar surface and capillary walls, nor can it solve the technical problem that the mortar filling layer in the slab track structure is prone to premature deterioration and destruction. Therefore, The slab track structure cannot reach the design service life of 60 years, and it poses a great threat to the safe operation of high-speed railways

Method used

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  • Water-resistance-excellent cement emulsified asphalt mortar used for plate-type ballastless track
  • Water-resistance-excellent cement emulsified asphalt mortar used for plate-type ballastless track
  • Water-resistance-excellent cement emulsified asphalt mortar used for plate-type ballastless track

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] A kind of water-repellent cement emulsified asphalt mortar in the present embodiment is made of anionic emulsified asphalt, double ion hydroxide emulsified asphalt, P·II type Portland cement, fineness modulus being 1.6 river sand, made of sulfoaluminic acid The expansion agent composed of calcium and gypsum mixed with an appropriate amount of naphthalene sulfonate high-efficiency water reducer and silicone emulsion defoamer and other components, the composition and proportion are shown in Table 6, and the cement is mixed by the single-component feeding method Emulsified asphalt mortar.

[0056] In this example, the anionic emulsified asphalt is produced by an emulsification process using 70# heavy traffic road petroleum asphalt, sodium alkylbenzene sulfonate with an average molecular weight of 400-500, fatty alcohol polyoxyethylene sodium sulfate, alkyl alcohol stabilizer, and water. , the pH is adjusted to 11-12 with sodium hydroxide NaOH, and its composition and relat...

Embodiment 2

[0060] A kind of hydrophobic cement emulsified asphalt mortar in this example is composed of anionic emulsified asphalt, double ion hydroxide suspension, dry material and an appropriate amount of polycarboxylic acid superplasticizer and silicone emulsion defoamer and other components , its composition and ratio are shown in Table 6, and the cement emulsified asphalt mortar is mixed by the two-component feeding method.

[0061]In this example, the anionic emulsified asphalt is manufactured by emulsification process using 90# heavy traffic road petroleum asphalt, sodium alkyl sulfonate and alkylphenol polyoxyethylene sulfate with an average molecular weight of 400-500, cellulose ether stabilizer, and water , use sodium hydroxide NaOH to adjust the pH to 11-12, then add Mg-Al-R(OH)SO to the prepared anionic emulsified asphalt 3 - Type double ion hydroxide suspension, its composition and proportioning ratio are as shown in Table 2.

[0062] Table 2 Composition and ratio of emuls...

Embodiment 3

[0068] A kind of hydrophobic cement emulsified asphalt mortar in this example is composed of anionic emulsified asphalt, double ion hydroxide emulsified asphalt, dry material and an appropriate amount of polycarboxylic acid superplasticizer and silicone emulsion defoamer and other components , its composition and ratio are shown in Table 6, and the composition and ratio of the dry material are shown in Table 3; the cement emulsified asphalt mortar is mixed by a two-component feeding method.

[0069] In this embodiment, the emulsified asphalt used for mixing mortar is a mixed emulsified asphalt formed after premixing of anionic emulsified asphalt and double ion emulsified asphalt in the factory. The composition of the anionic emulsified asphalt and double ion hydroxide emulsified asphalt The matching ratio is shown in Table 4.

[0070] Table 4 Composition and ratio of emulsified asphalt used in Example 3 (kg)

[0071]

[0072] Table 5 Composition and ratio of a hydrophobic ...

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Abstract

The invention relates to a water-resistance-excellent cement emulsified asphalt mortar used for a plate-type ballastless track. The mortar includes following components: cement, fine sand, an expanding agent, aluminum powder, anionic emulsified asphalt, di-ionic hydroxide emulsified asphalt, water, a proper amount of a water reducing agent and a proper amount of a defoaming agent. The mortar is reasonable in formula, has a hydrophobicity in capillary pore walls, is less in water absorption rate and is good in water-resistance, is good in durability, flowability and stability, is suitable for a CRTS II typed (vertically-connected) plate-type ballastless track, and can satisfy a requirement of 60-year service life of the plate-type ballastless track in a high-speed railway and a railway passenger dedicated line in our country.

Description

technical field [0001] The invention relates to a cement-emulsified asphalt mortar with excellent water resistance, in particular to a cement-emulsified asphalt mortar for CRTS II slab ballastless track with excellent water resistance, and belongs to the cross-technical field of slab ballast track construction and building materials. Background technique [0002] my country's high-speed railways with a speed of more than 300km per hour mainly use slab ballastless tracks, such as CRTS I (unit) and CRTS II (longitudinal) slab ballastless tracks. These two slab ballastless track structures are mainly composed of steel rails and fasteners, prefabricated concrete track slabs, cement emulsified asphalt mortar filling layers, concrete base plates or support layers, etc. from top to bottom. The cement emulsified asphalt mortar filling layer is located between the track slab and the base slab or the support layer, and its thickness is 40-60 (CRTSI type) mm or 20-40 (CRTS II type) mm,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B28/06C04B26/26
Inventor 邓德华元强刘赞群谢友均
Owner CENT SOUTH UNIV
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