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Polypropylene fiber concrete sleeper

A polypropylene fiber and concrete technology, applied in the field of sleeper manufacturing, can solve the problems of low-modulus synthetic fibers not being alkali-resistant, weak cement-based cohesion, high cost of high-modulus fibers, and improving mechanical properties and durability. , The effect of improving surface hydrophilicity and reducing stress strength

Active Publication Date: 2009-06-17
CHINA RAILWAY FIFTH SURVEY & DESIGN INST GRP CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] One purpose of the present invention is to solve above-mentioned sleeper crack to add high modulus fiber cost is higher, and ultimate elongation rate is low when being pulled; And low modulus synthetic fiber is not alkali-resistant, and intensity is low, and Y-type polypropylene fiber fiber intensity is not high , the bonding force with the cement base is not strong, and it is not easy to disperse in the concrete. It provides a method to significantly improve the impact cracking resistance of the sleeper, and at the same time improve the frost resistance of the sleeper.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Concrete raw material selection principle: cement is not less than 42.5 # Portland cement; the stones are crushed from mountain rocks, with a particle size of 5-25mm; the sand is selected with a fineness modulus of 2.5-3.5; the water reducing agent is a high-efficiency water reducing agent. Use the mix ratio as shown in the table below:

[0028]

Numbering

cement

(Kg / m 3 ) water

(Kg

/ m 3 ) the sand

(Kg / m 3 ) stone

(Kg / m 3 ) Superplasticizer

(Kg / m 3 ) Polypropylene

fiber

(Kg / m 3 )

implement

example 1

490 130

.3

564

1314

4.9

0.45

implement

Example 2

490 130

.3

564

1314

4.9

0.9

[0029] According to the mixing ratio of number (1), first add sand and gravel coarse aggregate, use a forced mixer to stir, stir (do not stop), add 1 / 3 of water, add fi...

Embodiment 2

[0032] According to the mix ratio of number (2), first add sand and gravel coarse aggregate, stir (do not stop), add 1 / 3 water, add fiber with a volume mixing rate of 0.1%, add cement, add the remaining 2 / 3 water, and finally add Liquid solution, stirring for a total of 3 minutes. Out of the material, enter the 2×5 joint mold of YII-F sleeper. The YII-F sleeper is reinforced with 8 Φ7.00mm spiral rib steel wires. The general vibration time is 120 seconds, and the pressurized vibration time is 100 seconds. After standing still for 2 hours, enter the steam room for curing, and after the curing meets the requirements for leaving the pool, go out of the pool for cutting. Product appearance inspection and sleeper strength random inspection before leaving the factory.

Embodiment 3

[0034] According to the mix ratio of number (1), first add sand and gravel coarse aggregate, stir (do not stop), add 1 / 3 water, add fiber with a volume mixing rate of 0.05%, add cement, add the remaining 2 / 3 water, and finally add Liquid solution, stirring for a total of 3 minutes. The material is discharged into the 2×4 joint mold of the IIIA sleeper. The IIIA sleeper is reinforced with 10 Φ7.00mm spiral rib steel wires. The reinforcement method is four vertical rows of steel wires, respectively 2, 4, 4, 2. The general vibration time is 120 seconds, and the pressurized vibration time is 100 seconds. After standing still for 3 hours, enter the steam room for curing, and then go out of the pool for cutting after the curing meets the requirements for exiting the pool. Product appearance inspection and sleeper strength random inspection before leaving the factory.

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Abstract

This invention relates to a PP fiber concrete sleeper, in which, modified PP fibers are added into the concrete, the doped volume is 0.2-1kg / cum to increase its shock resistance, anti-freezeness, its fatigue strength and eliminate the longitudinal crack and surface crack.

Description

technical field [0001] The invention relates to a polypropylene fiber concrete sleeper and a manufacturing method thereof, belonging to the field of sleeper manufacturing. Background technique [0002] The loss rate of railway sleepers in our country is very high. There are 47 domestic sleeper manufacturers with an annual output of tens of millions of sleepers and a design life of 50 years. However, the actual service life of some sleepers is only 7-9 years. Only 5 years, did not reach the design life at all. Most of its loss is caused by various cracks in prestressed concrete sleepers, that is, a large number of longitudinal cracks, surface cracks, longitudinal through cracks, transverse fractures and concrete damage under the rail bearing groove during use etc. Cracks are the main factors affecting the service life of sleepers. Therefore, it is very important to control the generation of cracks to improve the structural durability of sleepers and prolong their service li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01B3/28C04B14/38
Inventor 范立国周勇赵莹周兆春王笃金杨永强李道广徐端夫刘长勇付国强
Owner CHINA RAILWAY FIFTH SURVEY & DESIGN INST GRP CO LTD
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