Dynamic properties of PVA short fiber reinforced low-calcium fly ash - slag geopolymer under an SHPB impact load

Xiao, Shu-Hua; Liao, Shengjin; Zhong, Genquan; Guo, Yong; Lin, Jia-Xiang; Xie, Zhihong; Song, Ying

doi:10.1016/j.jobe.2021.103220

Cited by 21 publications

(12 citation statements)

References 46 publications

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“…Moreover, a higher percentage of PVA leads to a decrease in the interconnection between the particles, which affects the inhomogeneity of the geopolymer binder matrix. The increase of PVA volume in reaction has an adverse effect on the compactness of the GP2 sample [ 1 ].…”

Section: Resultsmentioning

confidence: 99%

“…Geopolymers represent alkali-activated materials compared to Portland cement, have satisfactory mechanical properties. However, there is a constant search for better performance, especially in terms of hardness and compressive strength and the elasticity of these materials [ 1 , 2 , 3 ]. It is unequivocally clear that the synthesis of geopolymer materials is economically and ecologically more profitable, given that secondary raw materials are used as the base precursor.…”

Section: Introductionmentioning

confidence: 99%

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Potential Usage of Hybrid Polymers Binders Based on Fly Ash with the Addition of PVA with Satisfying Mechanical and Radiological Properties

Mirković

Kljajević

Dolenec

et al. 2021

Gels

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Since recycled technologies usage is mandatory for environmental safety, and in this regard, it is important to examine new materials that can be used in construction and are primarily produced from fly ash. In addition to characteristics such as hardness and compressive strength, the given materials must also be radiologically and environmentally safe. The main concept of engineered geopolymer gel composites based on fly ash residues is focused on developing binder materials via gel formation processes that can replace ordinary cement materials. This study is unique in researching the potential use of fly ash from the Nikola Tesla thermal power plant in Serbia, where the hybrid geopolymeric materials synthesized from fly ash are experimentally examined with the addition 1 wt% and 2 wt% of polyvinyl alcohol (PVA). This paper aims to investigate the structural, morphological, mechanical, and radiological properties of hybrid materials with the addition of PVA and without additive in the period of ageing for 28 days at room temperature. The phase composition was investigated using X-ray powder diffraction (XRPD) analysis, while morphological characteristics of these materials were examined using scanning electron microscopy and energy dispersive X-ray analysis (SEM-EDS). Vibrational spectra of obtained samples are investigated using diffuse reflectance infrared Fourier transform (DRIFT) and Fourier transform infrared (FTIR) techniques. The hardness and compressive strength are also examined, indicating that the 1 wt% addition in geopolymeric matrix results in the best mechanical properties. Radiological measurements of investigated all geopolymer samples show decreasing activity concentrations of radionuclides for 50% compared to fly ash.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Potential Usage of Hybrid Polymers Binders Based on Fly Ash with the Addition of PVA with Satisfying Mechanical and Radiological Properties

Mirković

Kljajević

Dolenec

et al. 2021

Gels

View full text Add to dashboard Cite

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“…The dynamic mechanical behavior of concrete can be characterized by various methods, including drop hammer impact [18], projectile penetration impact [19,20], split Hopkinson pressure bar (SHPB) [21,22], and explosive shock [23], according to the dynamic impact strain rate range. Among these techniques, drop hammer impact and projectile penetration impact are usually used to analyze the damage evolution characteristics of materials under dynamic loading.…”

Section: Introductionmentioning

confidence: 99%

Effects of Strain Rate and Fiber Content on the Dynamic Mechanical Properties of Sisal Fiber Cement-Based Composites

Zhang¹,

Lei²,

Wang³

et al. 2023

Journal of Renewable Materials

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In this paper, a split Hopkinson pressure bar (SHPB) was used to investigate the dynamic impact mechanical behavior of sisal fiber-reinforced cement-based composites (SFRCCs), and the microscopic damage evolution of the composites was analyzed by scanning electron microscopy (SEM) and energy-dispersive X-ray spectrometry (EDS). The results show that the addition of sisal fibers improves the impact resistance of cement-based composite materials. Compared with ordinary cement-based composites (OCCs), the SFRCCs demonstrate higher post-peak strength, ductility, and energy absorption capacity with higher fiber content. Moreover, the SFRCCs are strain rate sensitive materials, and their peak stress, ultimate strain, and energy integrals all increase with increasing strain rate. From the perspective of fracture failure characteristics, the failure of OCCs is dominated by the brittle failure of crystal cleavage. In contrast, the failure mode of the SFRCCs changes to microscale matrix cracks, multi-scale pull-out interface debonding of fibers (fine filaments and bundles), and mechanical interlock. This research provides an experimental basis for the engineering application of high-performance and green cement-based composites.

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“…Concrete structures are subjected to many different types of loads over the course of their service life, including static loads (such as gravity), but also dynamic loads (such as explosions and impacts) [1][2][3]. The brittleness of concrete, however, under impact loading, can also lead to serious safety problems due to its low cracking resistance; this brittleness increases with an increase in strain rate; concrete's brittleness can lead to a serious safety problem [4,5].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Mechanical Strength Prediction of BFRC Based on Stacking Ensemble Learning and Genetic Algorithm Optimization

et al. 2023

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Split Hopkinson pressure bar (SHPB) tests are usually used to determine the dynamic mechanical strength of basalt-fiber-reinforced concrete (BFRC), but this test method is time-consuming and expensive. This paper makes predictions about the dynamic mechanical strength of BFRC by employing machine learning (ML) algorithms and feature sets drawn from experimental data from prior works. However, there is still the problem of improving the accuracy of the dynamic mechanical strength prediction by the BFRC, which remains a challenge. Using stacking ensemble learning and genetic algorithms (GA) to optimize parameters, this study proposes a prediction method that combines these two techniques for obtaining accurate predictions. This method is composed of three parts: (1) the training uses multiple base learners, and the algorithms employed by the learners include extreme gradient boosting (XGBoost), gradient boosting (GB), random forest (RF), and support vector regression (SVR); (2) multi-base learners are combined using a stacking strategy to obtain the final prediction; and (3) using GA, the parameters are optimized in the prediction model. An experiment was conducted to compare the proposed approach with popular techniques for machine learning. In the study, the stacking ensemble algorithm integrated the base learner prediction results to improve the model’s performance and the GA further improved prediction accuracy. As a result of the application of the method, the dynamic mechanical strength of BFRC can be predicted with high accuracy. A SHAP analysis was also conducted using the stacking model to determine how important the contributing properties are and the sensitivity of the stacking model. Based on the results of this study, it was found that in the SHPB test, the strain rate had the most significant influence on the DIF, followed by the specimen diameter and the compressive strength.

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Dynamic properties of PVA short fiber reinforced low-calcium fly ash - slag geopolymer under an SHPB impact load

Cited by 21 publications

References 46 publications

Potential Usage of Hybrid Polymers Binders Based on Fly Ash with the Addition of PVA with Satisfying Mechanical and Radiological Properties

Potential Usage of Hybrid Polymers Binders Based on Fly Ash with the Addition of PVA with Satisfying Mechanical and Radiological Properties

Effects of Strain Rate and Fiber Content on the Dynamic Mechanical Properties of Sisal Fiber Cement-Based Composites

Dynamic Mechanical Strength Prediction of BFRC Based on Stacking Ensemble Learning and Genetic Algorithm Optimization

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