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Frontiers of Structural and Civil Engineering

ISSN 2095-2430

ISSN 2095-2449(Online)

CN 10-1023/X

Postal Subscription Code 80-968

2018 Impact Factor: 1.272

Front. Struct. Civ. Eng.    2020, Vol. 14 Issue (6) : 1316-1330    https://doi.org/10.1007/s11709-020-0646-z
TRANSDISCIPLINARY INSIGHT
Deep learning model for estimating the mechanical properties of concrete containing silica fume exposed to high temperatures
Harun TANYILDIZI1(), Abdulkadir ŞENGÜR2, Yaman AKBULUT2, Murat ŞAHİN1
1. Faculty of Technology, Department of Civil Engineering, Firat University, Elazig 23100, Turkey
2. Faculty of Technology, Department of Electrical-Electronics Engineering, Firat University, Elazig 23100, Turkey
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Abstract

In this study, the deep learning models for estimating the mechanical properties of concrete containing silica fume subjected to high temperatures were devised. Silica fume was used at concentrations of 0%, 5%, 10%, and 20%. Cube specimens (100 mm × 100 mm × 100 mm) were prepared for testing the compressive strength and ultrasonic pulse velocity. They were cured at 20°C±2°C in a standard cure for 7, 28, and 90 d. After curing, they were subjected to temperatures of 20°C, 200°C, 400°C, 600°C, and 800°C. Two well-known deep learning approaches, i.e., stacked autoencoders and long short-term memory (LSTM) networks, were used for forecasting the compressive strength and ultrasonic pulse velocity of concrete containing silica fume subjected to high temperatures. The forecasting experiments were carried out using MATLAB deep learning and neural network tools, respectively. Various statistical measures were used to validate the prediction performances of both the approaches. This study found that the LSTM network achieved better results than the stacked autoencoders. In addition, this study found that deep learning, which has a very good prediction ability with little experimental data, was a convenient method for civil engineering.

Keywords concrete      high temperature      strength properties      deep learning      stacked auto-encoders      LSTM network     
Corresponding Author(s): Harun TANYILDIZI   
Just Accepted Date: 16 October 2020   Online First Date: 03 December 2020    Issue Date: 12 January 2021
 Cite this article:   
Harun TANYILDIZI,Abdulkadir ŞENGÜR,Yaman AKBULUT, et al. Deep learning model for estimating the mechanical properties of concrete containing silica fume exposed to high temperatures[J]. Front. Struct. Civ. Eng., 2020, 14(6): 1316-1330.
 URL:  
https://academic.hep.com.cn/fsce/EN/10.1007/s11709-020-0646-z
https://academic.hep.com.cn/fsce/EN/Y2020/V14/I6/1316
chemical compositions and physical properties Portland cement olivine silica fume
SiO2 (%) 21.12 42 91.0
Al2O3 (%) 5.62 0.5 0.58
Fe2O3 (%) 3.24 7 0.24
CaO (%) 62.94 0.05 0.71
MgO (%) 2.73 48 0.33
LOI (%) 1.42 1.84
specific surface area (cm2/g) 3430
particle size <45 mm (96.5%)
specific gravity (g/cm3) 3.10 3.3 2.2
Tab.1  The chemical properties of cement, olivine, and silica fume
designation of mixture cement (kg/m3) silica fume (kg/m3) W/C super-plasticizer (kg/m3) aggregates 0–3 mm (kg/m3) aggregates 3–8 mm (kg/m3)
S0 400 0.55 4.8 1259 687
S5 380 20 0.55 4.8 1255 685
S10 360 40 0.55 4.8 1250 682
S20 320 80 0.55 4.8 1239 676
Tab.2  Mixture proportion of concretes
Fig.1  An illustration for auto-encoder.
Fig.2  The illustration of the whole DNNs structure.
Fig.3  The structure of the LSTM unit.
Fig.4  CS results at 7 d.
Fig.5  CS results at 28 d.
Fig.6  CS results at 90 d.
Fig.7  UPV results at 7 d.
Fig.8  UPV results at 28 d.
Fig.9  UPV results at 90 d.
Fig.10  The DNNs model that was used in experiments.
Fig.11  Illustration of the DNN-based predicted and actual results for CS. (a) First experiment (60-40); (b) second experiment (70-30); (c) third experiment (80-20).
Fig.12  Illustration of the DNN-based predicted and actual results for UPV. (a) First experiment (60-40); (b) second experiment (70-30); (c) third experiment (80-20).
Fig.13  The regression plots for the DNN-based predicted and actual results of CS. (a) First experiment (60-40); (b) second experiment (70-30); (c) third experiment (80-20).
Fig.14  The regression plots for the DNN-based predicted and actual results of UPV. (a) First experiment (60-40); (b) second experiment (70-30); (c) third experiment (80-20).
Fig.15  The training and testing processes of the DNN model for CS.
Fig.16  The training and testing processes of the DNN model for UPV.
item first experiment (60-40) second experiment (70-30) third experiment (80-20)
MSE 0.0713 0.0417 0.0322
PSNR 59.5991 61.9296 63.0554
R-value 0.9349 0.9561 0.9565
MAPE 10.7343 4.1052 3.8593
Tab.3  DNN-based prediction evaluation metrics for CS
item first experiment (60-40) second experiment (70-30) third experiment (80-20)
MSE 0.0250 0.0149 0.0110
PSNR 64.1514 66.4000 75.0843
R-value 0.9761 0.9834 0.9842
MAPE 7.4453 6.0586 5.8039
Tab.4  DNN-based prediction evaluation metrics for UPV
item first experiment (60-40) second experiment (70-30) third experiment (80-20)
MSE 0.0620 0.0418 0.0288
PSNR 59.2055 61.9193 63.5427
R-value 0.9332 0.9319 0.9760
MAPE 10.4899 9.0691 8.7020
Tab.5  LSTM-based prediction evaluation metrics for CS
item first experiment (60-40) second experiment (70-30) third experiment (80-20)
MSE 0.0155 0.0117 0.0109
PSNR 66.2263 67.8183 69.6375
R-value 0.9797 0.9889 0.9924
MAPE 8.6751 8.4446 8.1583
Tab.6  LSTM-based prediction evaluation metrics for UPV
item the computational times (s)
DNN LSTM
CS (third experiment) 54.23 (19 Epochs) 334 (800 Epochs)
UPV (third experiment) 51.12 (17 Epochs) 341 (800 Epochs)
Tab.7  The comparison of computational times of DNN and LSTM
Fig.17  Illustration of the LSTM-based predicted and actual results of CS. (a) First experiment (60-40); (b) second experiment (70-30); (c) third experiment (80-20).
Fig.18  Illustration of the LSTM-based predicted and actual results of UPV. (a) First experiment (60-40); (b) second experiment (70-30); (c) third experiment (80-20).
Fig.19  The regression plots for the LSTM-based predicted and actual results for CS. (a) First experiment (60-40); (b) second experiment (70-30); (c) third experiment (80-20).
Fig.20  The regression plots for the LSTM-based predicted and actual results for UPV. (a) First experiment (60-40); (b) second experiment (70-30); (c) third experiment (80-20).
Fig.21  The training and testing processes of the LSTM network model (third experiment) for CS. (a) RMSE; (b) loss.
Fig.22  The training and testing processes of the LSTM network model (third experiment) for UPV. (a) RMSE; (b) loss.
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