Method for detecting internal structure of cement graded crushed stones for high-speed rail roadbed

A technology for grading crushed stones and internal structures, applied in the direction of measuring devices, preparation of test samples, material analysis using radiation, etc., can solve problems such as poor precision and large error range, and achieve novel methods, strong practicability, 3D reconstruction effect is obvious

Inactive Publication Date: 2016-10-12
SOUTHEAST UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the existing detection methods for the internal structure of cement graded gravel used in high-speed railway foundations have defects such as poor accuracy, large error range, and inability to accurately perform three-dimensional structural reconstruction.

Method used

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  • Method for detecting internal structure of cement graded crushed stones for high-speed rail roadbed
  • Method for detecting internal structure of cement graded crushed stones for high-speed rail roadbed
  • Method for detecting internal structure of cement graded crushed stones for high-speed rail roadbed

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Experimental program
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Effect test

Embodiment 1

[0036] Weigh the raw materials according to the mass fraction, take 90% graded crushed stone, 5% cement, 1:1 water-cement ratio (water 5%), fully mix and pour into a 100×100×100mm cube sample, and the curing temperature is 20± 2℃, curing humidity above 90%, curing for 28 days. A cylinder with a size of φ48×57mm is used as the scanning sample. The experimental result is that the porosity of cement graded crushed stone is 4.53%.

Embodiment 2

[0038] Weigh the raw materials according to the mass fraction, take 86% graded crushed stone, 7% cement, 1:1 water-cement ratio (water 7%), mix thoroughly and pour into a 100×100×100mm cube sample. The curing temperature is 20± 2℃, curing humidity above 90%, curing for 28 days. A cylinder with a size of φ48×57mm is used as the scanning sample. The experimental result is that the porosity of cement graded crushed stone is 2.58%.

Embodiment 3

[0040] Weigh the raw materials according to the mass fraction, take 94% graded crushed stone, 3% cement, 1:1 water-cement ratio (water 3%), mix thoroughly and pour into a 100×100×100mm cube sample. The curing temperature is 20± 2℃, curing humidity above 90%, curing for 28 days. A cylinder with a size of φ48×57mm is used as the scanning sample. The experimental result is that the porosity of cement graded crushed stone is 15.7%.

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Abstract

The invention discloses a method for detecting the internal structure of cement graded crushed stones for a high-speed rail roadbed. Three-dimensional reconstruction and analysis are conducted on spatial distribution of the cement graded crushed stones by adopting an X-ray tomography technique. The method comprises the steps that crushed stone aggregate of various particle sizes is screened and proportioned according to a crushed stone grading curve, graded crushed stones, cement, water and the like are uniformly mixed to be shaped and then subjected to standard curing, and a scanning sample is prepared by adopting a core boring sampling method; related parameters of scanning equipment are adjusted; distribution of different phases in the cement graded crushed stones is obtained by combining CT image analyzing and processing software according to the differences of grey values, and then three-dimensional reconstruction is conducted on the internal structure of the cement graded crushed stones. A more efficient, practical and accurate method for analyzing the internal structure of the cement graded crushed stones for the high-speed rail roadbed is provided. Compared with other methods, the method is novel, the spatial resolution is high (can be within 1 micrometer), the practicability is high, the precision is high, and three-dimensional reconstruction of the structure can be accurately conducted.

Description

Technical field [0001] The invention relates to a method for detecting the internal structure of cement graded gravel for high-speed railway foundations, and belongs to the field of research on the grading performance of cement graded gravel for high-speed railway foundations. Background technique [0002] With the continuous acceleration of my country’s reform and development and the economic and technological leaps, my country’s railway technology has continued to grow rapidly, especially the rapid development of high-speed railway technology, which embodies the leapfrog development of China’s railway transportation and makes China’s railway infrastructure overall Level to achieve historical leaps. At present, Northeast my country has entered a period of large-scale high-speed railway construction. The Ha-Da and Chang-Ji passenger trains that have been in operation, and the Panying, Shendan, Hazi, and Hamu passenger trains under construction, the high-speed railway mileage excee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/04G01N1/28G01N1/08
CPCG01N1/08G01N1/28G01N23/046
Inventor 佘伟蒋金洋赵国堂潘利杨国涛
Owner SOUTHEAST UNIV
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