Single and synergistic enhancement on durability of geopolymer mortar by polyvinyl alcohol fiber and nano-SiO2

Wang, Kexun; Zhang, Peng; Guo, Jinjun; Gao, Zhen

doi:10.1016/j.jmrt.2021.09.036

Cited by 39 publications

(28 citation statements)

References 28 publications

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“…Natural fibers improve the performance of concrete, cover the similarity between natural fibers and cement matrix, and may reduce the pumpability of shotcrete because they reduce the workability, a key factor in shotcrete's use in construction [25]. Reproduced from [18,[25][26][27][28][29][30], with permission from [Publisher]…”

Section: Role Of Fibers In Geopolymer Compositesmentioning

confidence: 99%

“…Murthy's study shows that 1% is the best content for polypropylene fiber to improve the compressive strength of geopolymer [35], while Bellum's research indicates that 2% is the best content for polypropylene fiber to improve the compressive strength of geopolymer [13], and Wang's study considers 0.8% polyvinyl alcohol fiber the best dosage to improve the compressive strength of geopolymer. However, Wang and Li's study indicates that a higher polypropylene fiber content represents a higher compressive strength [18] [37]. Xu has found that the optimal dosage of basalt fiber to improve the compressive strength of geopolymer is 0.6%, and that the comprehensive performance of 6mm basalt fiber is better than that of 3mm basalt fiber [38].…”

Section: Compressive Strengthmentioning

confidence: 99%

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Mechanical properties and durability of fiber reinforced geopolymer composites: A review on recent progressd

Qin

Yan

Zhou

et al. 2022

Preprint

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Geopolymer concrete shares similar mechanical properties with ordinary Portland cement (OPC) concrete, and is even provided with better performances in high temperature and high corrosion circumstances. However, geopolymer binder is still subject to the disadvantages of large shrinkage and high brittleness, which greatly limit its application. Fiber reinforcement is widely used in various geopolymer systems to overcome the brittleness issue, but retains the high strength. Over the past 10 years, a significant advance has been made in the research of fiber reinforced geopolymers in terms of toughening efficiency and durability improvement. This paper, as a mini review, focuses on three types of fibers, i.e., inorganic fiber, natural fiber and synthetic fiber, in geopolymers, and their specific effects on compressive, flexural and tensile strengths, fractural toughness, shear strength and durability including shrinkage, chemical and freezing-thaw resistances. The recement understanding of bonding mechanism and fiber-geopolymer interface are also discussed, and knowledge gaps and future work challenges are correspondingly pointed out.

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Section: Role Of Fibers In Geopolymer Compositesmentioning

confidence: 99%

Section: Compressive Strengthmentioning

confidence: 99%

Mechanical properties and durability of fiber reinforced geopolymer composites: A review on recent progressd

Qin

Yan

Zhou

et al. 2022

Preprint

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“…Several studies are being carried out in the field of EGC all over the world, and these include advanced experiments. The state-of-the-art research on EGC includes studies on the effects of different kinds of binders; on the blending proportions, i.e., the binary binders in EGC [ 4 ]; on the effects of nano materials on the interfacial properties of EGC [ 5 ]; and a few durability studies on the effects of nano materials [ 6 ]. Such advanced experiments require substantial costs and time.…”

Section: Introductionmentioning

confidence: 99%

Artificial Neural Network with a Cross-Validation Technique to Predict the Material Design of Eco-Friendly Engineered Geopolymer Composites

et al. 2022

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A material-tailored special concrete composite that uses a synthetic fiber to make the concrete ductile and imposes strain-hardening characteristics with eco-friendly ingredients is known as an “engineered geopolymer composite (EGC)”. Mix design of special concrete is always tedious, particularly without standards. Researchers used several artificial intelligence tools to analyze and design the special concrete. This paper attempts to design the material EGC through an artificial neural network with a cross-validation technique to achieve the desired compressive and tensile strength. A database was formulated with seven mix-design influencing factors collected from the literature. The five best artificial neural network (ANN) models were trained and analyzed. A gradient descent momentum and adaptive learning rate backpropagation (GDX)–based ANN was developed to cross-validate those five best models. Upon regression analysis, ANN [2:16:16:7] model performed best, with 74% accuracy, whereas ANN [2:16:25:7] performed best in cross-validation, with 80% accuracy. The best individual outputs were “tacked-together” from the best five ANN models and were also analyzed, achieving accuracy up to 88%. It is suggested that when these seven mix-design influencing factors are involved, then ANN [2:16: 25:7] can be used to predict the mix which can be cross-verified with GDX-ANN [7:14:2] to ensure accuracy and, due to the few mix trials required, help design the SHGC with lower costs, less time, and fewer materials.

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“…Geopolymer is formed by alkali excitation with natural silicon aluminum compounds or industrial solid wastes [ 17 , 18 , 19 ]. Because the raw materials of geopolymer are majorly industrial solid wastes, e.g., fly ash [ 20 ], slag [ 21 ], waste glass [ 15 ] and steel slag [ 22 ], it can effectively realize the sustainable utilization of natural resources as a promising alternative to cement [ 23 ]. In addition, previous study results have shown that geopolymer can effectively seal Pb, Zn, Cd and other heavy metal ions by chemical bonding and physical fixation [ 24 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Municipal Solid Waste Incineration Fly Ash on the Mechanical Properties and Microstructure of Geopolymer Concrete

Niu

Zhang

Guo

et al. 2022

Gels

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Geopolymers are environmentally friendly materials made from industrial solid waste with high silicon and aluminum contents, and municipal solid waste incineration fly ash (MFA) contains active ingredients such as Si, Al and Ca. According to this fact, a green and low-carbon geopolymer concrete was prepared using MFA as a partial replacement for metakaolin in this study. The mechanical properties of the MFA geopolymer concrete (MFA-GPC) were investigated through a series of experiments, including a compressive strength test, splitting tensile strength test, elastic modulus test and three-point bending fracture test. The effect of the MFA replacement ratio on the microstructure of MFA-GPC was investigated by SEM test, XRD analysis and FTIR analysis. MFA replacement ratios incorporated in GPC were 5%, 10%, 15%, 20%, 25%, 30%, 35% and 40% by replacing metakaolin with equal quality in this study. In addition, toxic leaching tests of MFA and MFA-GPC were performed by ICP-AES to evaluate the safety of MFA-GPC. The results indicated that the mechanical properties of MFA-GPC decreased with the increase of the MFA replacement ratio. Compared with the reference group of GPC without MFA, the maximum reduction rates of the cubic compressive strength, splitting tensile strength, axial compressive strength, elastic modulus, initiation fracture toughness, unstable fracture toughness and fracture energy of MFA-GPC were 83%, 81%, 78%, 93%, 77%, 73% and 61%, respectively. The microstructure of MFA-GPC was porous and carbonized; however, the type of hydrated gel products was still a calcium silicoaluminate-based silicoaluminate gel. Moreover, the leaching content of heavy metals from MFA-GPC was lower than that of the standard limit. In general, the appropriate amount of MFA can be used to prepare GPC, and its mechanical properties can meet the engineering requirements, but the amount of MFA should not be too high.

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Single and synergistic enhancement on durability of geopolymer mortar by polyvinyl alcohol fiber and nano-SiO2

Cited by 39 publications

References 28 publications

Mechanical properties and durability of fiber reinforced geopolymer composites: A review on recent progressd

Mechanical properties and durability of fiber reinforced geopolymer composites: A review on recent progressd

Artificial Neural Network with a Cross-Validation Technique to Predict the Material Design of Eco-Friendly Engineered Geopolymer Composites

Effect of Municipal Solid Waste Incineration Fly Ash on the Mechanical Properties and Microstructure of Geopolymer Concrete

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