Self-compacting concrete for foundation of high speed railway turnout plate

A self-compacting concrete, high-speed railway technology, applied in the field of concrete, can solve the problems that are not completely suitable for self-compacting concrete construction and durability requirements, and achieve the effects of reducing segregation and bleeding, improving workability, and strengthening bonding force

Inactive Publication Date: 2012-08-01
CONSTR COMPANY OF CHINA RAILWAY NO 8 ENGNEERING GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, only the China Association for Engineering Construction Standardization has promulgated CECS 203:2006 "Technical Regulations for the Application of Self-Compacting Concrete",

Method used

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  • Self-compacting concrete for foundation of high speed railway turnout plate
  • Self-compacting concrete for foundation of high speed railway turnout plate
  • Self-compacting concrete for foundation of high speed railway turnout plate

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0030] Example 1: The weight and percentage of each component of a self-compacting concrete used for the base of a high-speed railway switch slab are:

[0031] Cement 263 kg, accounting for 11.1%; fly ash 154 kg, accounting for 6.5%; slag powder 78 kg, accounting for 3.3%; fine aggregate 820 kg, accounting for 34.7%; coarse aggregate 815 kg, accounting for 34.4%; water 175 kg , Accounting for 7.4%; water reducing agent 5.50㎏, accounting for 0.23%; expanding agent 55㎏, accounting for 2.3%;

[0032] Said cement adopts Portland cement with specific surface area ≤350m2 / kg and alkali content ≤0.80%; Said fly ash adopts F class I grade fly ash, fineness ≤12%, water demand ratio ≤95% , Loss on ignition ≤5.0%.

[0033] The slag powder has a density of ≥2.8g / cm3, a specific surface area of ​​350m2 / kg~500m2 / kg, a loss on ignition ≤3.0%, a fluidity ratio ≥95%, and a 28d activity index ≥95%.

[0034] For the fine aggregate, the fine aggregate preferentially selects clean natural river sand with ...

Example Embodiment

[0045] Embodiment 2: The weight and percentage of each component of a self-compacting concrete used for the base of a high-speed railway switch slab are:

[0046] Cement 274 kg, accounting for 11.6%; fly ash 145 kg, accounting for 6.1%; slag powder 93 kg, accounting for 3.9%; fine aggregate 813 kg, accounting for 34.3%; coarse aggregate 815 kg, accounting for 34.4%; water 175 kg , Accounting for 7.4%; water reducing agent 5.00 kg, accounting for 0.21%; expanding agent 50 kg, accounting for 2.1%.

[0047] Said cement adopts Portland cement with specific surface area ≤350m2 / kg and alkali content ≤0.80%; Said fly ash adopts F class I grade fly ash, fineness ≤12%, water demand ratio ≤95% , Loss on ignition ≤5.0%.

[0048] The slag powder has a density of ≥2.8g / cm3, a specific surface area of ​​350m2 / kg~500m2 / kg, a loss on ignition ≤3.0%, a fluidity ratio ≥95%, and a 28d activity index ≥95%.

[0049] For the fine aggregate, the fine aggregate preferentially selects clean natural river san...

Example Embodiment

[0060] Example 3: The weight and percentage of each component of a self-compacting concrete used for the base of a high-speed railway turnout plate is

[0061] Cement 270kg, accounting for 11.3%; Fly ash 160kg, accounting for 6.7%; Slag powder 84kg, accounting for 3.5%; Fine aggregate 810kg, accounting for 34%; Coarse aggregate 815kg, accounting for 34.2%; Water 175 kg ㎏, accounting for 7.4%; water reducing agent 6.00㎏, accounting for 0.25%; expansion agent 60㎏, accounting for 2.5%;

[0062] The cement is ordinary Portland cement, the specific surface area is ≤350m2 / kg, and the alkali content is ≤0.80%; the fly ash is the F class I grade fly ash, the fineness is ≤12%, and the water demand ratio is ≤95 %, loss on ignition ≤5.0%.

[0063] The slag powder has a density of ≥2.8g / cm3, a specific surface area of ​​350m2 / kg~500m2 / kg, a loss on ignition ≤3.0%, a fluidity ratio ≥95%, and a 28d activity index ≥95%.

[0064] For the fine aggregate, the fine aggregate preferentially selects clea...

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Abstract

The invention discloses a self-compacting concrete for the foundation of a high speed railway turnout plate. The concrete comprises, by weight, 11-12% of cement, 6-7% of coal ash, 3-4% of slag powder, 33-35% of a fine aggregate, 34-35% of a coarse aggregate, 7-8% of water, 0.2-0.3% of a water reducer, and 2-3% of an expanding agent. The slump flow value of the self-compacting concrete is controlled based on a molding slump flow value of 600-650mm. Plate uncovering tests prove that the workability of the self-compacting concrete is good, only 300 seconds are needed for a whole process of disposable filling-up from blanking to filling-up, the compactness of the concrete after the plate uncovering is quite high, and the whole space of a filler layer is completely full of the self-compacting concrete. By adopting the self-compacting concrete to perfuse, the surface of the filling layer of the on-site perfusion turnout plate has the advantages of flattening and smoothness, no bubbles, and no cracks. The construction quality of the turnout plate of the tender passes client assessments, and all technical indexes accord with design requirements.

Description

technical field [0001] The invention relates to concrete, in particular to a self-compacting concrete used for a high-speed railway turnout plate base. Background technique [0002] Self-compacting concrete belongs to high-fluidity concrete, which has high fluidity without segregation and bleeding, and can automatically level and fill the model and the concrete wrapped with steel bars without vibrating or less vibrating. The comprehensive benefit of self-compacting concrete is remarkable, especially when it is used in places that are difficult to pour or even impossible to pour, it can avoid quality defects such as cavities, honeycombs, and pockmarks caused by insufficient vibration. In recent years, with the vigorous development of my country's high-speed rail, different ballastless track structures have been researched on the basis of introducing innovations, and the filling layers of track slabs and turnout slabs have been focused on and studied because of their particula...

Claims

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Application Information

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IPC IPC(8): C04B28/04
Inventor 邓国兵刘增旭彭舸许正科刘彦蒋付军
Owner CONSTR COMPANY OF CHINA RAILWAY NO 8 ENGNEERING GRP
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