Meso-structure simulation based concrete creeping property prediction method

A prediction method and concrete technology, applied in the direction of applying stable tension/compression to test material strength, preparation of test samples, special data processing applications, etc., can solve problems that cannot be promoted, do not consider the spatial distribution of coarse and fine aggregates, and have no Considering the influence of the proportion of concrete components and other issues, to achieve a wide range of applications

Inactive Publication Date: 2015-01-21
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0006] 1. The article "The Influence of Fly Ash Content and Water-Binder Ratio on the Creep Performance of High Performance Concrete and Its Mechanism" studied the influence of fly ash content and water-binder ratio on the creep performance of concrete (see Journal of Civil Engineering "No. 12, 2009, author: Zhao Qingxin), this method mainly considers the influence of fly ash content and water-cement ratio on creep, but does not consider the influence of concrete component ratio, nor does it consider the space of coarse and fine aggregates. Distribution;
[0007] 2. The article "Preliminary Research on Biaxial Compression Creep Experiment of Concrete" introduces the exper

Method used

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  • Meso-structure simulation based concrete creeping property prediction method
  • Meso-structure simulation based concrete creeping property prediction method
  • Meso-structure simulation based concrete creeping property prediction method

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Embodiment Construction

[0027] Such as figure 1 As shown, the prediction method of concrete creep properties based on mesoscopic fabric simulation, the steps are as follows:

[0028] 1. Concrete composition and proportion identification, the specific method is as follows:

[0029] Find out the composition and volume mix ratio of concrete as the basis for geometric grid modeling;

[0030] For example: the volume mix ratio of a certain concrete sample is: cement: fly ash: sand: stone = 0.2:0.1:0.2:0.5; another example: the volume mix ratio of a certain concrete sample is: cement mortar: coarse aggregate = 0.5: 0.5;

[0031] 2. Preparation of each single-component sample, the specific method is as follows:

[0032] Collect each single-component sample and process it into a cylindrical sample with a diameter-to-height ratio of 1:2. The unevenness deviation of the two ends of the cylindrical sample is required to be ±0.05 mm to eliminate the influence of the discreteness of the sample; It can also be ...

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Abstract

The invention belongs to the field of civil engineering and particularly relates to a meso-structure simulation based concrete creeping property prediction method. The meso-structure simulation based concrete creeping property prediction method comprises the following steps of 1 identifying concrete structure constituents and proportions; 2 preparing single-constituent samples; 3 respectively performing creep tests on the single-constituent samples; 4 establishing creep models on the single-constituent samples; 5 performing inversion to obtain creep parameters of the single-constituent samples; 6 conducting random geometric modeling on a concrete sample according to the constituents and proportions; 7 calculating and predicting the creeping property of the concrete sample. The meso-structure simulation based concrete creeping property prediction method can simulate the constitution situation of actual constituents of an actual concrete work, is not limited in laboratories and is wide in application range.

Description

technical field [0001] The invention belongs to the field of civil engineering, and in particular relates to a method for predicting creep properties of concrete based on mesoscopic fabric simulation. Background technique [0002] Concrete creep, also known as "creep", refers to the phenomenon that the deformation of concrete structures will increase with time under continuous load. Creep can cause the loss of prestress in prestressed concrete structures; in long-span beams, creep can also increase the deflection of the beam, these are the harmful effects of creep on the structure. On the other hand, in mass concrete structures, creep can reduce temperature stress and reduce shrinkage cracks; in structural stress concentration areas and structures with local stress caused by uneven foundation subsidence, creep can reduce the peak stress of the structure, these It will also have a beneficial effect on the structure. Therefore, the creep problem of concrete is very important...

Claims

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Application Information

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IPC IPC(8): G06F19/00G01N1/28G01N3/08
Inventor 杨文东程旭东李春宝
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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