Experimental and Statistical Study on Mechanical Characteristics of Geopolymer Concrete

Cui, Yifei; Gao, Kaikai; Zhang, Peng

doi:10.3390/ma13071651

Cited by 46 publications

(32 citation statements)

References 27 publications

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“…The addition of fibres in TGPC improves the modulus of elasticity from 2.13% to a maximum of 32.31%. This may be due to the effect of fibres' high elastic modulus and strong bond between the fibres and the matrix [46,47]. The comparison of modulus of elasticity for all the tested samples are given in Figure 9.…”

Section: Modulus Of Elasticitymentioning

confidence: 99%

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Engineering Properties of Hybrid Fibre Reinforced Ternary Blend Geopolymer Concrete

2021

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The primary aim of this research is to find an alternative for Portland cement using inorganic geopolymers. This study investigated the effect of steel and polypropylene fibres hybridisation on ternary blend geopolymer concrete (TGPC) engineering properties using fly ash, ground granulated blast furnace slag (GGBS) and metakaolin as the source materials. The properties like compressive strength, splitting tensile strength, flexural strength and modulus of elasticity of ternary blend geopolymer concrete. The standard tests were conducted on TGPC with steel fibres, polypropylene fibres and a combination of steel and polypropylene fibres in hybrid form. A total number of 45 specimens were tested and compared to determine each property. The grade of concrete considered was M55. The variables studied were the volume fraction of fibres, viz. steel fibres (0%, 0.5% and 1%) and polypropylene fibres (0%, 0.1%, 0.15%, 0.2% and 0.25%). The experimental results reveal that the addition of fibres in a hybrid form enhances the mechanical properties of TGPC. The increase in the compressive strength was nominal, and a significant improvement was observed in splitting tensile strength, flexural strength, and modulus of elasticity. Also, an attempt to obtain the relation between the different engineering properties was made with different volume fractions of fibre.

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Section: Modulus Of Elasticitymentioning

confidence: 99%

“…Sci. 2021, 5, x FOR PEER REVIEW 11 of 14 the effect of fibres' high elastic modulus and strong bond between the fibres and the matrix [46,47]. The comparison of modulus of elasticity for all the tested samples are given in Figure 9.…”

Section: Modulus Of Elasticitymentioning

confidence: 99%

Engineering Properties of Hybrid Fibre Reinforced Ternary Blend Geopolymer Concrete

2021

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“…MPa for the Si/Al of the fly ash of 2.9, 2.78, and 2.6, respectively [104]. Scanning Electron Microscopy (SEM) examined the results behind different compressive strength values.…”

Section: Research Significancementioning

confidence: 99%

Compressive Strength of Geopolymer Concrete Composites: Modeling and Comprehensive Systematic Review

Ahmed

Mohammed

2021

Preprint

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The growing concern about global climate change and its adverse impacts on societies is putting severe pressure on the construction industry as one of the largest producers of greenhouse gases. Given the environmental issues associated with cement production, geopolymer concrete has emerged as a sustainable construction material. Geopolymer concrete is cementless concrete that uses industrial or agro by-product ashes as the main binder instead of ordinary Portland cement; this leads to being an eco-efficient and environmentally friendly construction material. Compressive strength is one of the most important mechanical property for all types of concrete composites including geopolymer concrete, and it is affected by several parameters like an alkaline solution to binder ratio (l/b), fly ash (FA) content, SiO2/Al2O3 (Si/Al) of the FA, fine aggregate (F) and coarse aggregate (C) content, sodium hydroxide (SH) and sodium silicate (SS) content, ratio of sodium silicate to sodium hydroxide (SS/SH), molarity (M), curing temperature (T), curing duration (CD) inside the oven and specimen ages (A). In this regard, a comprehensive systematic review was carried out to show the effect of these different parameters on the compressive strength of the fly ash-based geopolymer concrete (FA-GPC). In addition, multi-scale models such as Artificial Neural Network (ANN), M5P-tree (M5P), Linear Regression (LR), and Multi-logistic Regression (MLR) models were developed to predict the compressive strength of FA-GPC composites. For the first time, in the modeling process, twelve effective parameters including l/b, FA, Si/Al, F, C, SH, SS, SS/SH, M, T, CD, and A were considered the modeling input parameters. Then, the efficiency of the developed models was assessed by various statistical assessment tools like Root Mean Squared Error (RMSE), Mean Absolute Error (MAE), Scatter Index (SI), OBJ value, and the Coefficient of determination (R2). Results show that the curing temperature, sodium silicate content, and ratio of the alkaline solution to the binder content are the most significant independent parameters that influence on the compressive strength of the FA-GPC, and the ANN model has better performance for predicting the compressive strength of FA-GPC in compared to the other developed models.

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“…The cementing or geopolymerization process of geopolymer precursors with alkaline activators can rapidly proceed to form a three-dimensional polymeric structure with complex Al-O-Si bonds and to generate continual material skeletons that enable high strengths [10]. With those advantages, geopolymer-based materials possess a series of excellent performances with promising potentials in engineering applications, including high mechanical strength, great fire resistance, enhanced leaching resistance, and improved contaminate stabilization [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Compositional Dependence of Pore Structure, Strengthand Freezing-Thawing Resistance of Metakaolin-Based Geopolymers

et al. 2020

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The understanding of the composition dependent properties and freezing-thawing (F-T) resistance of geopolymer materials is vital to their applications in cold regions. In this study, metakaolin-based geopolymer (MKG) mortars were fabricated by controlling the Si/Al ratio and the Na/Al ratio. The pore structure and strength were measured by mercury intrusion porosimetry and compression tests, respectively, which both showed obvious correlations with the material composition. Mass loss, strength loss, visual rate, and microscopic observation were adopted to assess the changes of the material properties and microstructure caused by F-T loads. The results showed that the strength-porosity relationship roughly followed a linear plot. Increases of the Si/Al ratio increased the capillary pore volume, but decreased the gel pore volume and the F-T resistance. Increases of the Na/Al ratio decreased the gel pore, but roughly enhanced the F-T resistance. The MKG mortar at the Na/Al ratio of 1.26 showed the lowest total pore volume and the best F-T resistance. The mechanisms of our experimental observations were that the abundantly distributed air voids connected by the capillary pores facilitated the relaxation of hydraulic pressures induced by the freezing of the pore liquid. The findings of this work help better clarify the compositional dependence of the pore structure, strength, and freezing-thawing resistance of MKG materials and provide fundamental bases for their engineering applications in cold regions.

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Experimental and Statistical Study on Mechanical Characteristics of Geopolymer Concrete

Cited by 46 publications

References 27 publications

Engineering Properties of Hybrid Fibre Reinforced Ternary Blend Geopolymer Concrete

Engineering Properties of Hybrid Fibre Reinforced Ternary Blend Geopolymer Concrete

Compressive Strength of Geopolymer Concrete Composites: Modeling and Comprehensive Systematic Review

Compositional Dependence of Pore Structure, Strengthand Freezing-Thawing Resistance of Metakaolin-Based Geopolymers

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