Preparation method of cement graded broken stones for high-speed rail roadbeds

A technology of graded crushed stone and high-speed railway foundation is applied in the field of preparation of cement-graded crushed stone for high-speed railway foundation, which can solve the problems that the deflection index cannot characterize the durability, crack resistance, water stability, and lack of rationality of the roadbed structure. , to achieve the effect of improved mechanical properties, good effect, good impermeability and frost resistance

Active Publication Date: 2014-12-10
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the deflection index cannot represent the basic properties of the roadbed structure and materials such as durability, crack r

Method used

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  • Preparation method of cement graded broken stones for high-speed rail roadbeds
  • Preparation method of cement graded broken stones for high-speed rail roadbeds

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: The raw materials were weighed according to the mass fraction, and the mass ratio of graded crushed stone, label P·II52.5 cement, and tap water was 90:5:5. Fully mixed and compacted, the curing temperature is 20±2°C, and the curing humidity is above 90%; the compressive strength at 7 days is 5.9MPa, the compressive strength at 28 days is 10.5MPa, and the dry density is 2.28g / cm 3 , Shrinkage coefficient 0.35.

Embodiment 2

[0022] Example 2: The raw materials were weighed according to the mass fraction, and the mass ratio of graded crushed stone, P·II52.5 cement, and tap water was 85:7:7. After fully mixing and compacting, the curing temperature is 20±2°C, and the curing humidity is above 90%; the 7d compressive strength is 7.5MPa, the 28d compressive strength is 101.1MPa, and the dry density is 2.31g / cm 3 , Shrinkage coefficient 0.63.

Embodiment 3

[0023] Example 3: The raw materials were weighed according to the mass fraction, and the mass ratio of graded crushed stone, P·II52.5 cement, and tap water was 95:3:6. Fully mixed and compacted, curing temperature is 20±2°C, curing humidity is above 90%; 7d compressive strength is 5.2MPa, 28d compressive strength is 9.4MPa, dry density is 2.25g / cm 3 , Shrinkage coefficient 0.29.

[0024] The change law of compressive strength of cement graded crushed stone with different cement content with age is shown in figure 1 , it can be seen from the figure that the early strength of cement-stabilized macadam increases rapidly with age, and will gradually ease after reaching a certain curing age, and the more cement content, the higher the compressive strength.

[0025] The effect of cement dosage on the drying shrinkage performance of cement graded crushed stone is shown in figure 2 , it can be seen from the figure that as the cement dosage increases, the shrinkage strain and shrink...

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Abstract

The invention provides a preparation method of cement graded broken stones for high-speed rail roadbeds. The method comprises the following steps: determining ratio of coarse and fine aggregates of the graded broken stones: weighing the graded broken stones which are more than 4.75mm as coarse aggregates, observing the CBR value change rule by adopting a single-particle size aggregate step-by-step filling mode and a method for respectively carrying out mechanical performance test on the CBR value to determine the final grading of different particle sizes of aggregates, taking the aggregates which are less than 4.75mm as fine aggregates, calculating the grading of the fine aggregates by adopting the K-value theory of the maximum density curve theory, and determining the ratio of the coarse and fine aggregates by using a method for measuring the CBR value in a quality gradient increasing manner; weighing and mixing different particle sizes of broken stones; by taking cement as a binding material and graded broken stones as aggregates, mixing the graded broken stones with the cement and water, compacting, molding and conserving, so as to obtain the cement graded broken stones. Compared with an existing method, the preparation method has the advantages that the broken stones for the roadbeds are relatively reasonable, the mechanical property is improved, and meanwhile, the resistance to shrinkage, the anti-fatigue load, the durability and the like are improved.

Description

technical field [0001] The invention relates to the construction field of cement graded crushed stones for high-speed railway subgrades, and provides a method for preparing cement graded crushed stones for high-speed railway foundations. Background technique [0002] With the continuous acceleration of my country's reform and development and the leapfrogging of economy and technology, my country's railway technology, especially high-speed rail technology, continues to develop rapidly, which embodies the progress of my country's railway transportation to achieve leapfrog development, and makes China's overall railway infrastructure level. History spans. High-speed railway subgrade is the basis for bearing track structure and train load, and is an important part of railway engineering. In addition to basic functions, it should also meet the requirements of impact load when trains run at high speed: have sufficient strength, stiffness and stability And durability, able to withs...

Claims

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Application Information

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IPC IPC(8): C04B28/04
Inventor 蒋金洋赵国堂佘伟潘利
Owner SOUTHEAST UNIV
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