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A Prediction Method of Appearance Bubbles in Hardened Concrete

A technology of concrete and air bubbles, which is applied in the field of material engineering, can solve problems such as unfavorable and impactful engineering quality control, and achieve the effect of low cost and high accuracy

Active Publication Date: 2016-02-03
JIANGSU SOBUTE NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of "post-feedback" evaluation method of hardened concrete appearance bubbles is very unfavorable to the actual project quality control. If there are appearance bubbles after concrete pouring, it can only be solved by auxiliary remedial measures, which will greatly affect the quality of the project. Modern Concrete urgently needs a "pre-judgment" method, which can detect possible appearance bubbles in time before the concrete is poured, and guide the optimization and improvement of the concrete mix ratio and related control technologies

Method used

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  • A Prediction Method of Appearance Bubbles in Hardened Concrete
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  • A Prediction Method of Appearance Bubbles in Hardened Concrete

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Example 1: Prediction of air bubbles in laboratory concrete appearance

[0019] The laboratory concrete mix ratio is shown in Table 1, and the admixtures are changed to obtain different hardened concrete appearance bubbles. Concrete mixture is predicted according to the method of the present invention:

[0020] (1) Take the freshly mixed concrete mixture and divide it into three parts evenly after stirring for 2 minutes. One part shall be tested according to GB / T50080 for expansion m , the unit is mm, one part is tested according to GB / T50080 for gas content A f , the unit is %, a test bubble discharge resistance coefficient c discharge , the unit is N·s / m 2 ; Bubble discharge resistance coefficient c discharge The test method: Prepare a barrel-shaped container with a diameter of 30cm and a height of 60cm. The lower end of the container is closed and the upper end is open; one end with a spring of 20cm has a radius of r ball (unit: m)(r ball ≤0.015m), the density ...

Embodiment 2

[0030] Example 2: Prejudgment of concrete appearance bubbles in a municipal project

[0031] Using the concrete mix ratio of a municipal project as shown in Table 4, the quality of hardened concrete appearance bubbles is predicted. Two different concrete admixtures are used in the mix ratio to optimize the concrete appearance quality control technical scheme. The method of the present invention is used for pre-judgment, and the pre-judgment method is the same as in Example 1. The results of the parameter tests of the concrete mixture and the pre-judgment of appearance bubbles are shown in Table 5. After the concrete formwork is removed, the image recognition processing technology is used to conduct statistics on the appearance of hardened concrete bubbles. The statistical results are shown in Table 6.

[0032] Table 4 Concrete mix ratio (kg / m 3 )

[0033] serial number

[0034] Table 5 Test results of various parameters of concrete mixture and prediction results ...

Embodiment 3

[0039] Example 3: Prediction of concrete appearance bubbles in a bridge project

[0040] The concrete mix ratio of a bridge project is used as shown in Table 7 to predict the appearance of hardened concrete bubbles. The mix ratio not only introduces the double mixing of fly ash and mineral powder, which makes the system more complex, but also uses two different concrete admixtures. The method of the present invention is used for pre-judgment, and the pre-judgment method is the same as that in Example 1. The results of the test of various parameters of the concrete mixture and the pre-judgment of appearance bubbles are shown in Table 8. After the concrete formwork is removed, the image recognition processing technology is used to conduct statistics on the appearance of hardened concrete bubbles. The statistical results are shown in Table 9.

[0041] Table 7 Concrete mix ratio (kg / m 3 )

[0042] serial number

[0043] Table 8 Test results of various parameters of c...

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Abstract

The invention relates to a prediction method of appearance bubbles of hardened concrete. The method comprises the steps of dividing concrete mixture into three parts in average, wherein one of the three parts is used for the test of expansion degree Fm, another part is used for the test of air content Af, and the rest part is used for the test of bubble discharge resistance coefficient cdischarge; then, calculating according to the formula of k=Fm.Af.cdischarge; dividing k value into three level according to ranges being more than 10000, being between 5000 and 10000, and being less than 5000, wherein the appearance quality of the hardened concrete corresponding to the three level ranges is respectively poor, medium and excellent. According to the prediction method, the number of the appearance bubbles of the hardened concrete can be rapidly predicted, and the prediction result is high in accuracy; the problem that at present, the appearance bubbles of the hardened concrete can be estimated only after form removal can be solved; furthermore, According to the method, the cost is low, and simplicity is realized.

Description

technical field [0001] The invention relates to a method for predicting appearance bubbles of hardened concrete, belonging to the field of material engineering. Background technique [0002] For concrete structures, the appearance quality is an important indicator of the performance of hardened concrete. With the continuous progress of modern concrete preparation technology, obvious appearance quality defects such as "honeycomb pockmarked surface" and "sand spots waterline" have gradually been eliminated. With the use of admixtures and high-efficiency water reducers, the concrete gelation system becomes complex and difficult to control, and the problem of "appearance bubbles" in hardened concrete is gradually highlighted. According to statistics, from 1999 to 2013 in my country, reports on the appearance of bubbles in hardened concrete showed a linear upward trend. [0003] The bubbles on the appearance of hardened concrete are usually observed only after the formwork is re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/38
Inventor 石亮高南萧吴烨杨勇王洪松刘建忠
Owner JIANGSU SOBUTE NEW MATERIALS
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