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Method and device for testing and evaluating shrinkage cracking performance of solidified soil materials

A technology of shrinkage cracking and evaluation method, which is applied in measurement devices, material analysis, and material analysis by optical means. , the effect of high-precision testing process

Active Publication Date: 2021-07-13
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It solves the problems of heavy workload and time-consuming in previous test methods, and the inability to simulate the actual boundary conditions of the basic structure and imperfect evaluation indicators.

Method used

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  • Method and device for testing and evaluating shrinkage cracking performance of solidified soil materials
  • Method and device for testing and evaluating shrinkage cracking performance of solidified soil materials
  • Method and device for testing and evaluating shrinkage cracking performance of solidified soil materials

Examples

Experimental program
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Effect test

Embodiment 1

[0071] Drying shrinkage test of lime soil: the soil source selected in this embodiment is soft soil obtained from subway excavation, the lime content is 5%, and the compaction degree is controlled at 95%. The specimens were made by static pressure forming method under the condition of optimum moisture content of 18%. The specific test steps are as follows:

[0072] (1) Test piece making: adopt customized mould, make test piece size and attached in the present invention Figure 4 Consistent, in the shape of a dog bone. First, mix the soft soil that has been dried through a 4.75cm sieve with lime and water evenly, then weigh a certain amount of solidified soil and put it into the test mold, use a universal press to form it statically, and remove the mold after 24 hours. , and bagged and put into a standard curing room for curing, the curing time is 7 days.

[0073] (2) Start-up of the test chamber: open the test chamber and preheat it, adjust the temperature to 25°C, and the ...

Embodiment 2

[0085] Lime soil temperature shrinkage test: The soil source selected in this example is clay obtained from subway excavation, the cement content is 7%, and the compaction degree is controlled at 95%. The specimens were made by static pressure forming method under the condition of optimal moisture content of 16%. The specific test steps are as follows:

[0086] (1) Test piece making: adopt customized mould, make test piece size and attached in the present invention Figure 4 Consistent, in the shape of a dog bone. First, mix the clay that has been dried through a 4.75cm sieve with cement and water evenly, then weigh a certain amount of solidified soil and put it into the test mold, use a universal press to form it statically, and remove the mold two hours after forming. Bagged and placed in a standard curing room for curing, the curing time is 7 days, and placed in an oven on the last day, the temperature of the oven is set at 105°C for drying, and finally reaches a dry stat...

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Abstract

The invention discloses a method and device for testing and evaluating the shrinkage cracking performance of solidified soil materials. In this test and evaluation method for the shrinkage cracking performance of the solidified soil, the performance changes of the material at the mechanical level and the deformation level during the shrinkage cracking process are considered comprehensively, and the performance of the solidified soil material is given by comprehensively considering the total amount of shrinkage stress φ and the cracking rate γ Comprehensive evaluation index: drying shrinkage cracking coefficient Ω 干缩 and thermal shrinkage cracking coefficient Ω 温缩 . The test device proposed by the invention is composed of a signal acquisition and control system, an environmental condition control system, a shrinkage cracking performance test system, a clamping loading system and an auxiliary centering and leveling system. The shrinkage cracking performance test system is mainly composed of a stress detection unit, a specimen moisture content detection unit and a crack growth detection unit. The invention solves the problems of heavy workload, long time consumption, inability to simulate the actual boundary conditions of the base structure and imperfect evaluation indexes of the previous test methods. At the same time, the test device can realize a fully automatic and high-precision test process, ensuring the stability, reliability and accuracy of the test results.

Description

technical field [0001] The invention relates to the field of performance testing of road materials, in particular to a testing and evaluation method and device for shrinkage cracking performance testing of solidified soil materials. Background technique [0002] Soil solidification technology was first proposed by countries such as Europe and the United States, and it was introduced into my country in the 1990s. Because of its convenient material acquisition, low price, high rigidity and good stability after curing, it is widely used in road subgrades and grassroots in my country. under construction. However, solidified soil materials are greatly affected by temperature and humidity, and shrinkage cracks (including early dry shrinkage cracks and later temperature shrinkage cracks) are prone to occur under the action of high and low temperature and reciprocating dry and wet conditions. Under the cyclic action of traffic load, the shrinkage cracks of the base layer are easily ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/08G01N3/04G01N3/18G01N21/3563G01N21/359G01N21/84
CPCG01N3/04G01N3/08G01N3/18G01N21/3563G01N21/359G01N21/84G01N2021/8411G01N2203/0017G01N2203/006G01N2203/0075G01N2203/0298G01N2203/0641G01N2203/0676G01N2203/0682
Inventor 江训利罗雪黄志义张磊
Owner ZHEJIANG UNIV
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