CN102503268B - Cement emulsifying asphalt mortar for repairing CRTS II type ballastless track and preparation method thereof - Google Patents

Abstract

The invention discloses cement emulsifying asphalt mortar for repairing a CRTS II type ballastless track, which is prepared from raw materials comprising the following components in part by weight: 555 to 565 parts of cement, 870 to 900 parts of sand, 200 to 215 parts of emulsified asphalt, 140 to 145 parts of water and 33.3 to 36.7 parts of admixture; and the cement comprises sulfo-aluminate cement accounting for 90 percent of the total weight of the cement, common silicate cement accounting for 5 percent of the total weight of the cement and a bearing mortar grouting material accounting for 5 percent of the total weight of the cement, and the admixture comprises a poly-carboxylic acid water reducing agent accounting for 96 percent of the total weight of the admixture, calcium chloride accounting for 2 percent of the total weight of the admixture, melamine accounting for 1 percent of the total weight of the admixture and calcium sulfate accounting for 1 percent of the total weight of the admixture. The suitable range of the temperature is 15 to 35 DEG C, the initial setting time is greater than 60 minutes, and the strength can reach the qualified index of 28 days, which is specified by a specification, within 12 hours; and moreover, the index of the working performance and the index of the endurance performance can meet the requirements of a current specification standard and a construction process, and the construction efficiency of a ballastless track is enhanced.

Description

The maintenance of CRTS II type non-fragment orbit cement emulsified asphalt mortar and compound method thereof

Technical field

The present invention relates to a kind of construction material, specifically a kind of cement emulsified asphalt mortar for the maintenance of CRTS II type non-fragment orbit bed course.

Background technology

At home, especially beginning of this century last century Mo, along with the fast development of high speed railway construction, the development of non-fragment orbit is advanced by leaps and bounds.Introduce, in digestion, the basis that absorbs through innovation again, develop the non-fragment orbits such as CRTS I, II be board-like, and progressively obtain large-scale application in Qin-Shen Passenger Line, Zheng Xi line, Wu Guangxian, Beijing-Tianjin inter-city, Tianjin Qin line, Jing-Hu Railway, Beijing-to-Shijiazhuang line.Under cyclic reverse loading and weather environmental activity along with train, local broken, cracking occurs in cement emulsified asphalt mortar bed course ecto-entad, need to carry out repairing work.Maintenance track plate bedding mortar normally carries out under the condition that guarantees operation, often needs the same day and keep in repair to recover current next day, and servicing time is very limited.At present domestic not for maintenance cement emulsified asphalt mortar performance requriements, maintenance is not had concrete operative norm with mortar composition, material category, technical indicator, maintenance process etc. yet.Conventional cement emulsified asphalt mortar setting time is long, gain in strength is slow, can't satisfy the time requirement of track plates bed course maintenance work.For the emergency work that may occur etc., there are the Special Circumstances of requirement the time, conventionally can not satisfy the requirement of rapid construction equally with cement emulsified asphalt mortar.

Summary of the invention

The objective of the invention is to solve the problem that the cement-emulsified asphalt setting time is long, gain in strength is slow, a kind of CRTS is provided IICement emulsified asphalt mortar and the compound method thereof of the maintenance of type non-fragment orbit.

For achieving the above object, the technical solution used in the present invention is: CRTS IIThe cement emulsified asphalt mortar of type non-fragment orbit maintenance, made by the raw material that comprises following weight proportion:

Cement 555～565, sand 870～900, emulsified bitumen 200～215, water 140～145, admixture 33.3～36.7; Described composite cement comprises: account for the aluminosulfate cement, 5% ordinary Portland cement of gross weight 90% and 5% bearing mortar grouting material and form; Composite additive is by the polycarboxylate water-reducer that accounts for admixture gross weight 96%, 2% calcium chloride, and 1% trimeric cyanamide, 1% calcium sulfate forms.

Core technology of the present invention comprises: (1) by selecting different cement matrix substituted for silicon acid salt cements, preparation as gelling material, has improved the mortar early strength as auxiliary composite cement grog system take quick hardening sulphoaluminate as main, normal silicate.(2) by additive complex, uses with polycarboxylate water-reducer as main component, villaumite, vitriol etc. be the morning of the composite additive of composition by force, has effectively shortened the time of coagulation of mortar, has improved the early strength of mortar.

Prepare the method for above-mentioned cement emulsified asphalt mortar, comprise the following steps:

(1) take composite cement and sand according to proportioning, fully mix is evenly rear standby as siccative; According to proportioning, calcium chloride, trimeric cyanamide and calcium sulfate fully are dissolved in polycarboxylate water-reducer, are made into composite additive standby;

(2) first drop into emulsified bitumen in stirrer, add again admixture and water, then start stirrer, control 60 rev/mins of rotating speeds, and the beginning timing, stir after 1 minute, improve stirrer rotating speed to 120 rev/min, in 3 minutes with the siccative continuous uniform be sprinkled into stirrer, all raw materials add complete after continuation stirred 2 minutes, namely get product.

This preparation method: (1) mixing speed is low, and mortar is difficult for producing bubble, and the air content qualified need not to add defoamer.(2) the siccative adition process is difficult for producing the siccative conglomeration, and Mortar mix is uniform and stable.

The cement emulsified asphalt mortar of CRTS II type non-fragment orbit maintenance of the present invention, temperature applicable range is 15～35 ℃, presetting period is greater than 60min, can be in 12 hours intensity reach 28 days qualified indexs of regulation and stipulation, and serviceability index, endurance quality index can satisfy the requirement of current specifications standard and construction technology, improved Construction of Ballastless Track efficient, for maintenance ballastless track mortar bed course lays the foundation.Lower cost for material, extensive market.Its performance test results sees Table 1.

Table 1

Embodiment

Embodiment 1

CRTS IIThe raw material of the cement emulsified asphalt mortar of type non-fragment orbit maintenance forms: cement 555kg, sand 870 kg, emulsified bitumen 200 kg, water 140 kg, admixture 33.3 kg; Described cement is comprised of the aluminosulfate cement that accounts for cement gross weight 90%, 5% ordinary Portland cement and 5% bearing mortar grouting material, described admixture is by the polycarboxylate water-reducer that accounts for admixture gross weight 96%, 2% calcium chloride, 1% trimeric cyanamide, 1% calcium sulfate forms.

The preparation method of above-mentioned cement emulsified asphalt mortar:

(1) take cement and sand according to proportioning, fully mix is evenly rear standby as siccative; According to proportioning, calcium chloride, trimeric cyanamide and calcium sulfate fully are dissolved in polycarboxylate water-reducer, are made into admixture standby;

(2) first drop into emulsified bitumen in stirrer, add again admixture and water, then start stirrer, control 60 rev/mins of rotating speeds, and the beginning timing, stir after 1 minute, improve stirrer rotating speed to 120 rev/min, in 3 minutes with the siccative continuous uniform be sprinkled into stirrer, all raw materials add complete after continuation stirred 2 minutes, namely get product.

Embodiment 2

CRTS IIThe raw material of the cement emulsified asphalt mortar of type non-fragment orbit maintenance forms: cement 565kg, sand 900 kg, emulsified bitumen 215 kg, water 145 kg, admixture 36.7 kg; Described cement is comprised of the aluminosulfate cement that accounts for cement gross weight 90%, 5% ordinary Portland cement and 5% bearing mortar grouting material, described admixture is by the polycarboxylate water-reducer that accounts for admixture gross weight 96%, 2% calcium chloride, 1% trimeric cyanamide, 1% calcium sulfate forms.

The preparation method is with embodiment 1.

Embodiment 3

CRTS IIThe raw material of the cement emulsified asphalt mortar of type non-fragment orbit maintenance forms: cement 560 kg, sand 880 kg, emulsified bitumen 212 kg, water 142kg, admixture 35.0kg; Described cement is comprised of the aluminosulfate cement that accounts for cement gross weight 90%, 5% ordinary Portland cement and 5% bearing mortar grouting material, described admixture is by the polycarboxylate water-reducer that accounts for admixture gross weight 96%, 2% calcium chloride, 1% trimeric cyanamide, 1% calcium sulfate forms.

The preparation method is with embodiment 1.

Embodiment 4

CRTS IIThe raw material of the cement emulsified asphalt mortar of type non-fragment orbit maintenance forms: cement 558 kg, sand 890 kg, emulsified bitumen 215 kg, water 141kg, admixture 36.4kg; Described cement is comprised of the aluminosulfate cement that accounts for cement gross weight 90%, 5% ordinary Portland cement and 5% bearing mortar grouting material, described admixture is by the polycarboxylate water-reducer that accounts for admixture gross weight 96%, 2% calcium chloride, 1% trimeric cyanamide, 1% calcium sulfate forms.

The preparation method is with embodiment 1.

Claims (2)

1. CRTS IIThe cement emulsified asphalt mortar of type non-fragment orbit maintenance is characterized in that being made by the raw material that comprises following weight proportion: cement 555～565, sand 870～900, emulsified bitumen 200～215, water 140～145, admixture 33.3～36.7; Described cement is comprised of the aluminosulfate cement that accounts for cement gross weight 90%, 5% ordinary Portland cement and 5% bearing mortar grouting material, described admixture is by the polycarboxylate water-reducer that accounts for admixture gross weight 96%, 2% calcium chloride, 1% trimeric cyanamide, 1% calcium sulfate forms.

2. the method for preparing cement emulsified asphalt mortar claimed in claim 1 is characterized in that comprising the following steps:

(1) take cement and sand according to proportioning, fully mix is evenly rear standby as siccative; According to proportioning, calcium chloride, trimeric cyanamide and calcium sulfate fully are dissolved in polycarboxylate water-reducer, are made into admixture standby;

(2) first drop into emulsified bitumen in stirrer, add again admixture and water, then start stirrer, control 60 rev/mins of rotating speeds, and the beginning timing, stir after 1 minute, improve stirrer rotating speed to 120 rev/min, in 3 minutes with the siccative continuous uniform be sprinkled into stirrer, all raw materials add complete after continuation stirred 2 minutes, namely get product.