Construction technique for ultralow-temperature high-property concrete for railway construction in frigid areas

A technology of high-performance concrete and construction technology, which is applied in the processing of building materials, construction, building construction, etc., to achieve the effects of increasing mixing temperature and mold entry temperature, simple design process, and convenient optimization

Active Publication Date: 2012-11-28
CHINA RAILWAY 20 BUREAU GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are no domestic literatures for reference in terms of concrete winter construction experience in severe cold areas

Method used

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  • Construction technique for ultralow-temperature high-property concrete for railway construction in frigid areas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Such as figure 1 A construction process of ultra-low temperature high-performance concrete for railway construction in severe cold areas shown, including the following steps:

[0040] Step 1. Mixing of ultra-low temperature and high-performance concrete: After uniform mixing of cementitious materials, sand, gravel, high-efficiency water reducer, composite antifreeze and water, the bulk density is 2350kg / m 3 ~2450kg / m 3 ultra-low temperature high-performance concrete. The maximum water-binder ratio and sand ratio of the ultra-low temperature high-performance concrete are all based on the design drawings of the concrete structure to be constructed, and are designed according to the mix ratio design method of concrete for railway construction, which is a conventional railway well-known by those skilled in the art. Mix design method of concrete for construction.

[0041] The cementitious material is uniformly mixed with cement and mineral admixtures in a weight ratio of ...

Embodiment 2

[0136]In this embodiment, the difference between the ultra-low temperature high-performance concrete mixed in step 1 and the embodiment 1 is that the water-binder ratio of the ultra-low temperature high-performance concrete is 0.3, and the weight ratio of sand to cementitious material is 1.4-1.5. The sand rate is 32%, the weight ratio of cement and fly ash in the cementitious material is 88:12, the weight ratio of the composite antifreeze to the cementitious material is 4:100, and the weight ratio of the superplasticizer to the cementitious material is 0.8:100; the composite antifreeze used is different from that of Example 1 in that the composition of the composite antifreeze is by weight: 35% nitrate, 30% organic compound, 0.5% calcium formate, and the balance is water.

[0137] In this embodiment, the proportions of the remaining components of the ultra-low temperature high-performance concrete used, as well as the process steps and process parameters of the construction pro...

Embodiment 3

[0139] In this embodiment, the difference between the ultra-low temperature high-performance concrete mixed in step 1 and the embodiment 1 is that the water-binder ratio of the ultra-low temperature high-performance concrete is 0.4, and the weight ratio of sand to cementitious material is 1.7-1.8. The sand rate is 38%, the weight ratio of cement and fly ash in the cementitious material is 78:22, the weight ratio of the composite antifreeze to the cementitious material is 5:100, and the weight ratio of the superplasticizer to the cementitious material is 1: 100; the composite antifreeze used is different from Example 1 in that the composition of the composite antifreeze is by weight: 32% nitrate, 32% organic compound, 0.8% calcium formate, and the balance is water.

[0140] In this embodiment, the proportions of the remaining components of the ultra-low temperature high-performance concrete used, as well as the process steps and process parameters of the construction process are...

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Abstract

The invention discloses a construction technique for ultralow-temperature high-property concrete for railway construction in frigid areas. The construction technique comprises the steps as follows: A, mixing ultralow-temperature high-property concrete: gelled materials, sand, crushed stone, an efficient water reducing agent, compound antifreeze and water are evenly mixed to obtain the ultralow-temperature high-property concrete; the gelled materials are made by evenly mixing cement and mineral admixtures in the weight ratio of (88-78):(12-22); the weight ratio of the compound antifreeze to the mineral admixtures is (3-6):100; the compound antifreeze comprises 30 to 35 wt% of nitrate, 30 to 33 wt% of organic compound, 0.5 to 1wt% of calcium formate, and water as the rest; the nitrate is calcium nitrate or calcium nitrite; and the organic compound is methanol or alcohol; B, pouring the ultralow-temperature high-property concrete; and C, curing the ultralow-temperature high-property concrete. The construction technique has the advantages of reasonable design, simplicity in construction steps, convenience in operation, fast construction progress, low construction cost, and good structural quality of concrete used in construction.

Description

technical field [0001] The invention belongs to the technical field of concrete construction, and in particular relates to a construction technology of ultra-low temperature high-performance concrete for railway construction in severe cold areas. Background technique [0002] The civil works in front of the station of the new railway Harbin-Qiqihar Passenger Dedicated Line are located in the southwest of Heilongjiang Province. The main climate characteristics of the areas along the line are: the extreme maximum temperature of 39.8°C, the extreme minimum temperature of -42.6°C, and the average temperature of the coldest month is lower than -15°C. The total length of the line is 280.893km. The winter is extremely cold and dry, and the winter rest period is as long as six months. The maximum freezing depth of the soil along the line is 1.89m to 2.14m. According to the current passenger train construction schedule and the requirements of the Ministry of Railways, winter construc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E04G21/02C04B28/00
Inventor 廖太昌帖锋斌刘百成魏杏色谷炼平张永鸿薛琪仲维玲赵朝阳马颖仙曹万玲张利民冯艳娜沈亚妮冯英瑞李坦
Owner CHINA RAILWAY 20 BUREAU GRP
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