Prediction of concrete sulfuric acid corrosion evaluation index model based on grey system theory

Lin, Mingqiang; Zeng, Qinglong; Dai, Fengjuan; Zhang, Ran

doi:10.21595/vp.2024.24390

Vibroengineering Procedia

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Published: 27 September 2024

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Prediction of concrete sulfuric acid corrosion evaluation index model based on grey system theory

Mingqiang Lin¹

Qinglong Zeng²

Fengjuan Dai³

Ran Zhang⁴

^{1, 2}School of Civil Engineering and Architecture, University of Jinan, Jinan, China

³School of Civil Engineering, Shandong Jiaotong University, Jinan, China

⁴Jinan Real Estate Surveying and Mapping Research Institute, Jinan, China

Corresponding Author:

Mingqiang Lin

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Abstract

In order to predict the impact of sulfate corrosion on concrete, based on grey system theory, GM(1,1) and GM(1, N) models were used to predict and analyze the compressive strength and relative dynamic elastic modulus of concrete under sulfuric acid corrosion. The results show that the prediction error of the GM(1,1) model for concrete sulfate corrosion attenuation is within 5 %, and the residual size test of the GM(1, N) model for concrete sulfate corrosion is within 10 %.

1. Introduction

Grey system theory [1] predicts the development of prediction samples with a small number of samples, and has good predictions for systems with small samples and more unknown information. Recent studies have further demonstrated the versatility and accuracy of grey models in concrete research. For example, Zheng Chuanlei et al. [2] analyzed and predicted the relative elastic modulus of fiber-reinforced recycled aggregate concrete under freeze-thaw conditions using the GM(1,1) model, showing that when the recycled aggregate replacement rate exceeds 50 % (by mass), its impact on concrete frost resistance becomes minimal, with a prediction accuracy of first-order. Bao et al. [3] employed the GM(1,1) model to simulate the durability of sisal fiber concrete in marine environments, finding that the relative residual error between predicted and experimental values was small, indicating that the model can reliably predict concrete lifespan. Zhang et al. [4] developed a GM(1,3) prediction model for the compressive strength of white dense concrete using pore structure parameters, with an average error of less than 10 % between predicted and experimental values, highlighting the significant influence of pore structure on the mechanical properties of concrete. Feng Zhongju et al. [5] used the GM(1,1) model to predict the durability of concrete in high-cold salt marsh regions, achieving a prediction error of less than 6 %, with a low-probability error of under 5 %, demonstrating high prediction accuracy. Gao Zhe et al. [6] studied the impact of initial stress damage on the durability of lightweight aggregate concrete using the GM(1,1) model and performed lifespan predictions, concluding that the model provides first-order prediction accuracy and can quantitatively evaluate the frost resistance of lightweight aggregate concrete after catastrophic events. The GM (1, N) model was constructed using significantly correlated influencing factors so that the grey system model has no requirements for the quantity of experimental data, and is suitable for predicting the corrosion life of multiple types of concrete. This article predicts the evaluation indicators of concrete after sulfuric acid corrosion based on the GM(1,1) model and GM(1, N) model.

2. GM(1,1) model prediction

2.1. Establishment of GM (1,1) model

The establishment of a grey system model primarily encompasses the processes of data verification and preprocessing, model selection, model parameter estimation, model accuracy testing, and the evaluation of prediction accuracy. The general steps for modeling are illustrated in Fig. 1.

Fig. 1Modeling Steps

2.2. GM(1,1) model verification

When the accuracy of the GM(1,1) model does not meet the requirements, the residual sequence can be used to establish the residual GM(1,1) model and modify the original model to improve accuracy.

2.3. GM(1,1) model prediction of compressive strength of sulfuric acid corroded concrete

Sulfuric acid corroded concrete was calculated and analyzed by writing MATLAB program. Taking A7, A2, and A8 as examples, predicting the decay rate of the GM(1,1) model can obtain parameters [ $a$ , $u$ ] through calculation:

[ $a$ , $u$ ]_A7= [0.046313,1.036371];

[ $a$ , $u$ ]_A2= [0.025404,1.075179];

[ $a$ , $u$ ]_A8= [0.012389,1.052259].

The prediction formula can be obtained:

1

{\hat{x}}_{A 7}^{(1)} (t + 1) = - 21.38 e^{- 0.046313 t} + 22.38,

2

{\hat{x}}_{A 2}^{(1)} (t + 1) = - 41.32 e^{- 0.025404 t} + 42.32,

3

{\hat{x}}_{A 8}^{(1)} (t + 1) = - 86.52 e^{- 0.0123891 t} + 87.51 .

Fig. 2 depicts the degradation of concrete at different ages due to sulfuric acid corrosion. According to Table 1 [8] and Fig. 3, it can be seen that the GM(1,1) model is suitable for predicting the attenuation of concrete sulfuric acid corrosion. The ratio of calculated values to experimental values is around 1, with an error of no more than 5 %.

Fig. 2Degradation of concrete at different ages due to sulfuric acid corrosion

a) 15 d

b) 30 d

c) 60 d

d) 90 d

Fig. 3Comparison of experimental and calculated values

Table 1Comparison of calculated concrete compressive strength results with experimental data

Time / d	EV A₇	EV A₂	EV A₈	CV A₇	CV/EV A₇	CV A₂	CV/EV A₂	CV A₈	CV/EV A₈
0	1	1	1	1.00	1.00	1.00	1.00	1.00	1.00
15	0.97	1.01	1.01	0.97	1.04	1.03	1.00	1.03	1.02
30	0.93	1.03	1.02	0.92	1.01	1.02	0.99	0.98	1.00
45	0.89	1	1.03	0.88	0.99	1.01	0.99	0.99	0.98
60	0.81	0.96	1.01	0.84	0.96	1.00	1.04	1.00	0.99
75	0.80	0.94	0.99	0.80	0.94	0.98	0.99	1.00	0.99
90	0.77	0.91	0.97	0.77	0.91	0.97	1.00	1.00	1.00
105	0.74	0.89	0.95	0.73	0.89	0.96	0.99	1.00	1.01
120	0.70	0.86	0.94	0.70	0.87	0.95	1.00	1.01	1.01
Average					1.01		1.00		1.01
C					0.12		0.35		0.22

2.4. Prediction of relative dynamic elastic modulus of concrete subjected to sulfuric acid corrosion using GM(1,1) model

Taking A7, A2, and A8 as examples, predicting the relative dynamic elastic modulus of GM(1,1) model can obtain parameters [ $a$ , $u$ ] through calculation:

[ $a$ , $u$ ]_A7= [0.042215, 1.045150];

[ $a$ , $u$ ]_A2= [0.025141, 1.084889];

[ $a$ , $u$ ]_A8= [0.013419, 1.070685].

The prediction formula can be obtained:

4

{\hat{x}}_{A 7}^{(1)} (t + 1) = - 23.76 e^{- 0.042215 t} + 24.76,

5

{\hat{x}}_{A 2}^{(1)} (t + 1) = - 42.15 e^{- 0.025141 t} + 43.15,

6

{\hat{x}}_{A 8}^{(1)} (t + 1) = - 78.79 e^{- 0.013419 t} + 79.79 .

From Table 1 and Fig. 4, it can be seen that the GM(1,1) model is suitable for predicting the relative dynamic elastic modulus of sulfuric acid corroded concrete. The ratio of calculated values to experimental values is around 1, with an error of no more than 5 %.

Fig. 4Comparison between experimental and calculated value

Table 2Comparison of calculated relative dynamic elastic modulus values with experimental results

Time / d	EV A₇	EV A₂	EV A₈	CV A₇	CV/EV A₇	CV A₂	CV/EV A₂	CV A₈	CV/EV A₈
0	1	1	1	1.00	1.00	1.00	1.00	1.00	1.00
15	0.97	1.02	1.02	0.98	1.01	1.05	1.03	1.05	0.97
30	0.96	1.04	1.05	0.94	0.98	1.02	0.98	1.04	1.01
45	0.92	1.01	1.04	0.90	0.98	1.00	0.99	1.02	1.02
60	0.84	0.97	1.02	0.87	1.03	0.97	1.00	1.01	1.01
75	0.82	0.95	1.00	0.83	1.01	0.95	1.00	1.00	1.00
90	0.80	0.92	0.98	0.80	0.99	0.92	1.00	0.98	1.00
105	0.77	0.9	0.96	0.76	0.99	0.90	1.00	0.97	0.99
120	0.73	0.87	0.95	0.73	1.00	0.88	1.01	0.96	0.99
Average					1.01		1.00		0.99
C					0.14		0.22		0.32

3. GM(1,N) model prediction

3.1. GM(1,N) model

The GM(1,1) model only considers the variation rule of a variable under the single factor of time. If the influence of multiple variables is to be taken into account, the GM(1,N) model needs to be used. The GM(1,N) model can be employed to describe first-order, multivariable linear dynamic changes, with its input variables being the N-dimensional correlated influencing factors and the time series of the prediction object.

3.2. Grey relational analysis theory

The measure of the correlation between two system elements over time or other objects is called the degree of correlation. Grey correlation analysis is a method of measuring the correlation between two factors based on the similarity of their development trends. It is suitable for quantitative measurement of system change trends.

3.2.1. Grey correlation degree calculation

1)The reference sequence of system behavior and the corresponding control sequence that affects its behavior:

7

X = {[\begin{array}{l} X_{1}, X_{2}, \dots, X_{n} \end{array}]}^{T},

where, $X_{i} = [X_{i}^{1}, X_{i}^{2}, \dots, X_{i}^{n}]^{T}$ is the numerical value of each indicator $N$ years used for calculating the correlation coefficient.

2) Data transformation:

8

X_{i}^{^{'}} = \frac{X_{i}}{X_{i}^{1}} = X_{i}^{^{'}} (1), X_{i}^{^{'}} (2), \dots, X_{i}^{^{'}} (n),

where, $i$ is 1, 2,..., $n$ .

3) Relevance:

9

γ_{o i} = \frac{1}{n} \sum_{k = 1}^{n} γ_{o i} (k),

where, $k$ is 1, 2,..., $n$ , and $i$ is 1, 2,..., $m$ .

4) The magnitude and significance of correlation degree.

The degree of correlation indicates the closeness of the relationship between the subsequence and the parent sequence. If $r_{1} > r_{2}$ , the closeness of the relationship between subsequence 1 and the parent sequence is greater than that between subsequence 2 and the parent sequence.

3.3. GM(1,N) model prediction of compressive strength of concrete after sulfuric acid corrosion

3.3.1. Calculation of correlation degree

$X_{1}^{(0)}$ is the sequence of concrete compressive strength, $X_{2}^{(0)}$ is the sequence of corrosion time, $X_{3}^{(0)}$ is the sequence of sulfuric acid pH value, $X_{4}^{(0)}$ is the sequence of water cement ratio, and $X_{5}^{(0)}$ is the sequence of fly ash content.

Standardize the sequence to obtain standardized sequences $X_{1}^{0'}$ = (0.985, 0.985,..., 0.926), $X_{2}^{0'}$ = (0, 0.125,..., 1), $X_{3}^{0'}$ = (0.67, 0.67,..., 1), $X_{4}^{0'}$ = (0.8, 0.8,..., 0.8), $X_{5}^{0'}$ = (0.33, 0.33,..., 0.33). The calculation of the degree of incidence based on grey theory is presented in Table 3.

It can be seen that the order of importance of the influencing factors is $X_{3}^{(0)}$ > $X_{5}^{(0)}$ > $X_{4}^{(0)}$ > $X_{2}^{(0)}$ . The gray correlation between sulfuric acid pH value and concrete compressive strength is the highest, indicating that sulfuric acid pH value has the greatest impact on concrete compressive strength among these four influencing factors; The grey correlation between corrosion time and concrete compressive strength is the smallest, indicating that corrosion time has the minimal impact on concrete compressive strength among these four influencing factors.

Table 3Grey correlation degree

Project	$γ (X_{1}^{0'}, X_{2}^{0'})$	$γ (X_{1}^{0'}, X_{3}^{0'})$	$γ (X_{1}^{0'}, X_{4}^{0'})$	$γ (X_{1}^{0'}, X_{5}^{0'})$
Grey correlation degree	0.5644	0.8065	0.5846	0.7799

3.3.2. GM(1,N) model prediction

Calculate the parameter a [–0.5924, –0.0028, 0.0692,0.07, –1.1786] using the Matlab program, and calculate X. The residual size test was used with $e =$ 7.1 %, which meets the requirements.

Prediction of relative dynamic elastic modulus of concrete after sulfuric acid corrosion using GM (1, N) model.

3.3.3. Calculation of correlation degree

$X_{1}^{(0)}$ is the sequence of relative dynamic elastic modulus of concrete, $X_{2}^{(0)}$ is the sequence of corrosion time, $X_{3}^{(0)}$ is the sequence of sulfuric acid pH value, $X_{4}^{(0)}$ is the sequence of water cement ratio, and $X_{5}^{(0)}$ is the sequence of fly ash content. Standardize the sequence to obtain standardized sequences $X_{1}^{0'}$ = (0.935, 0.955,..., 0.877), $X_{2}^{0'}$ = (0, 0.125,..., 1), $X_{3}^{0'}$ = (0.67, 0.67,..., 1), $X_{4}^{0'}$ = (0.8, 0.8,..., 0.8), $X_{5}^{0'}$ = (0.33, 0.33,..., 0.33). The calculation of the degree of incidence based on grey theory is presented in Table 4 [9].

Table 4Grey correlation degree

Project	$γ (X_{1}^{0'}, X_{2}^{0'})$	$γ (X_{1}^{0'}, X_{3}^{0'})$	$γ (X_{1}^{0'}, X_{4}^{0'})$	$γ (X_{1}^{0'}, X_{5}^{0'})$
Grey correlation degree	0.5644	0.7802	0.5753	0.7785

It can be seen that the order of importance of the influencing factors is $X_{3}^{(0)}$ > $X_{5}^{(0)}$ > $X_{4}^{(0)}$ > $X_{2}^{(0)}$ . The grey correlation between the pH value of sulfuric acid and the relative dynamic elastic modulus of concrete is the highest, indicating that the pH value of sulfuric acid has the greatest impact on the relative dynamic elastic modulus of concrete among these four influencing factors; The grey correlation between corrosion time and the relative dynamic elastic modulus of concrete is the smallest, indicating that corrosion time has the minimal impact on the relative dynamic elastic modulus of concrete among these four influencing factors.

3.3.4. GM(1,N) model prediction

Calculate the parameter a [–0.4719, –0.0032, 0.0757, 0.0111, –0.8809] using Matlab program, and calculate $X_{1}^{0'}$ . The residual size test was used with $e =$ 6.9 %, which meets the requirements.

4. Conclusions

This article analyzes the changes in the sulfuric acid corrosion performance of concrete through grey theory, and the specific conclusions are as follows:

1) A prediction model for evaluating the performance of concrete after sulfuric acid corrosion was proposed based on grey theory, and the prediction model is in good agreement with experimental values.

2) Through correlation analysis, it is pointed out that the pH value of sulfuric acid has a significant impact on the neutralization depth and compressive strength decay rate of concrete. The influence of fly ash content on the compressive strength decay rate is similar to that of water cement ratio.

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About this article

Received

23 July 2024

Accepted

01 September 2024

Published

27 September 2024

SUBJECTS

Materials and measurements in engineering

DOI

https://doi.org/10.21595/vp.2024.24390

Keywords

concrete

sulfate corrosion

grey theory

compressive strength

relative dynamic modulus of elasticity

Acknowledgements

This work was financially supported by Shandong province institution (2019GSF111050) and Key research and development project of Doctoral foundation of University of Jinan (XBS1820) and Science and technology project of University of Jinan (W2022186).

Data Availability

The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

Conflict of interest

The authors declare that they have no conflict of interest.

This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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M. Lin, Q. Zeng, F. Dai, and R. Zhang, “Prediction of concrete sulfuric acid corrosion evaluation index model based on grey system theory,” Vibroengineering Procedia, Vol. 55, pp. 194–200, Sep. 2024, https://doi.org/10.21595/vp.2024.24390

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TY  - JOUR
DO  - 10.21595/vp.2024.24390
UR  - https://doi.org/10.21595/vp.2024.24390
TI  - Prediction of concrete sulfuric acid corrosion evaluation index model based on grey system theory
T2  - Vibroengineering Procedia
AU  - Lin, Mingqiang
AU  - Zeng, Qinglong
AU  - Dai, Fengjuan
AU  - Zhang, Ran
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VL  - 55
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 @article{Lin_2024, title={Prediction of concrete sulfuric acid corrosion evaluation index model based on grey system theory}, volume={55}, ISSN={2538-8479}, url={https://doi.org/10.21595/vp.2024.24390}, DOI={10.21595/vp.2024.24390}, journal={Vibroengineering Procedia}, publisher={JVE International Ltd.}, author={Lin, Mingqiang and Zeng, Qinglong and Dai, Fengjuan and Zhang, Ran}, year={2024}, month=sep, pages={194–200} }

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[1]M. Lin, Q. Zeng, F. Dai, and R. Zhang, “Prediction of concrete sulfuric acid corrosion evaluation index model based on grey system theory,” Vibroengineering Procedia, vol. 55, pp. 194–200, Sep. 2024, doi: 10.21595/vp.2024.24390.

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Lin, Mingqiang, Qinglong Zeng, Fengjuan Dai, and Ran Zhang. “Prediction of Concrete Sulfuric Acid Corrosion Evaluation Index Model Based on Grey System Theory.” Vibroengineering Procedia 55 (September 27, 2024): 194–200. https://doi.org/10.21595/vp.2024.24390.

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Prediction of concrete sulfuric acid corrosion evaluation index model based on grey system theory

Abstract

1. Introduction

2. GM(1,1) model prediction

2.1. Establishment of GM (1,1) model

2.2. GM(1,1) model verification

2.3. GM(1,1) model prediction of compressive strength of sulfuric acid corroded concrete

2.4. Prediction of relative dynamic elastic modulus of concrete subjected to sulfuric acid corrosion using GM(1,1) model

3. GM(1,N) model prediction

3.1. GM(1,N) model

3.2. Grey relational analysis theory

3.2.1. Grey correlation degree calculation

3.3. GM(1,N) model prediction of compressive strength of concrete after sulfuric acid corrosion

3.3.1. Calculation of correlation degree

3.3.2. GM(1,N) model prediction

3.3.3. Calculation of correlation degree

3.3.4. GM(1,N) model prediction

4. Conclusions

References

About this article

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