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Ultralow-temperature high-performance concrete for railway construction in severe cold regions and preparation technique thereof

A high-performance concrete and ultra-low temperature technology, which is applied in the field of high-performance concrete preparation, achieves the effects of low investment cost, convenient optimization, and guaranteed construction quality

Active Publication Date: 2012-12-12
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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  • Ultralow-temperature high-performance concrete for railway construction in severe cold regions and preparation technique thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The ultra-low temperature high-performance concrete prepared by the present invention is uniformly mixed with cementitious material, sand, gravel, high-efficiency water reducer, composite antifreeze and water, and the volume density of the ultra-low temperature high-performance concrete is 2350kg / m 3 ~2450kg / m 3 , and the maximum water-binder ratio and sand ratio of the ultra-low-temperature high-performance concrete are designed according to 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.

[0034]The cementitious material is uniformly mixed with cement and mineral admixture in a weight ratio of 15-20:85-80. In actual use, the mineral admixture is coal fly ash or ground slag powder. In this embodiment, the mineral admixture is coal fly ash.

[0035] The water reducing rate of the superplasticizer is not less than 25%, and the weight ratio of the superplasti...

Embodiment 2

[0115] In this example, the difference between the mixed ultra-low temperature high-performance concrete and Example 1 is that the water-binder ratio of the ultra-low temperature high-performance concrete is 0.3, the weight ratio of sand to cementitious material is 1.4-1.5, and 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 Example 1: the composition of the composite antifreeze is by weight: 35% nitrate, 30% organic compound, 0.5% calcium formate, and the balance is water.

[0116] In this example, the proportion of other components of the ultra-low temperature high-performance concrete used, as well as the process steps and process parameters of its preparation process are the same as those in Example 1.

Embodiment 3

[0118] In this example, the difference between the mixed ultra-low temperature high-performance concrete and Example 1 is that the water-binder ratio of the ultra-low temperature high-performance concrete is 0.4, the weight ratio of sand to cementitious material is 1.7-1.8, and 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.

[0119] In this example, the proportion of other components of the ultra-low temperature high-performance concrete used, as well as the process steps and process parameters of its preparation process are the same as those in Example 1.

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Abstract

The invention discloses an ultralow-temperature high-performance concrete for railway construction in severe cold regions and a preparation technique thereof. The concrete is prepared by evenly mixing cementing material, sand, gravel, high-efficiency water reducing agent, composite antifreezing agent and water, wherein the cementing material is prepared by evenly mixing cement and mineral admixture in a weight ratio of (15-20):(85-80); the water reducing rate of the high-efficiency water reducing agent is not less than 25%; the composite antifreezing agent comprises 30-35 wt% of nitrate, 30-33 wt% of organic compound, 0.5-1 wt% of calcium formate and the balance of water; the nitrate is calcium nitrate or calcium nitrite; and the organic compound is methanol or ethanol. The preparation technique comprises the following steps: 1. preparing the composite antifreezing agent; and 2. evenly mixing to obtain the ultralow-temperature high-performance concrete. The preparation technique disclosed by the invention is simple to operate and has the advantages of simple steps and favorable use effect; and the workability of concrete, and the mechanical properties and endurability after curingcan satisfy the design requirements.

Description

technical field [0001] The invention belongs to the technical field of high-performance concrete preparation, and in particular relates to an ultra-low temperature high-performance concrete for railway construction in severe cold regions and a preparation process thereof. 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...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B24/04
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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