The Investigation on Setting Time and Strength of High Calcium Fly Ash Based Geopolymer

Cornelis, Remigildus; Priyosulistyo, Henricus; Satyarno, Iman; Rochmadi, .

doi:10.4028/www.scientific.net/amm.881.158

Cited by 12 publications

(6 citation statements)

References 12 publications

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“…The high compressive strength of GC4 caused by the amount of paste is sufficient to produce excess thickness, thereby allowing a perfect geopolymer reaction and an adequate amount of binding gel [31]. This is consistent with the previous study that geopolymer paste and mortar compressive strength amounted to 60 MPa after 56 days [32,33]. The condition is slightly different from the OPCC because an increase in the cement paste raises the volume of water needed for the hydration process, resulting in higher workability and lower compressive strength.…”

Section: Compressive Strengthsupporting

confidence: 91%

“…The previous research on geopolymer paste (GP) and geopolymer mortar (GM), has several parameters that resulted in high mechanical strength. These include the molarity of NaOH of 10 M, the ratio of Na2SiO3 to NaOH (R) of 2, the weight ratio of alkaline to fly ash (A) of 0.35, and the volume ratio of paste to sand voids (Rm) of 1.5 [32,33]. Furthermore, the Rc parameter was raised by 0.25 increment from 1 to 1.75 to determine the effect of the volume ratio of mortar to CA void on the GC mechanical properties.…”

Section: Figure 5 the Filling Concept Of Paste In Geopolymer Mortarmentioning

confidence: 99%

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Effect of the Mortar Volume Ratio on the Mechanical Behavior of Class CI Fly Ash-Based Geopolymer Concrete

et al. 2022

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This research described the effect of the mortar volume ratio on the mechanical behavior of Class CI fly ash-based geopolymer concrete. The absolute volume ratio parameters were designed to determine the effects on the mechanical properties of the geopolymer concrete. The volume ratio of the mortar to coarse aggregate voids (Rc) was increased by 0.25 increments, from 1 to 1.75, using constant parameters of 10 M NaOH at a ratio of Na2SiO3to NaOH (R). Furthermore, the alkaline to fly ash ratio (A) of 0.35 and the volume ratio of paste to fine aggregate voids (Rm) of 1.5 were based on geopolymer paste and mortar investigations previously published. The test results showed that 1) the Rc ratio influences the workability and compressive strength of geopolymer concrete; 2) the increase in the Rc ratio by 1.75 is not linear with the rise in compressive strength but produces better mechanical properties; 3) it does not affect the tensile strength of both geopolymer and OPC concretes; 4) the lower the Rc ratio, the higher the flexural strength; 5) the Rc ratio does not affect the OPC concrete and GC tensile strength; 6) the bond stress in geopolymer concrete with an Rc ratio of 1.75 is higher than in OPC concrete; and 7) Rc ratio does not affect the early strength of geopolymer concrete. The geopolymer concrete experienced an increase in compressive strength after 28 days, while the OPC concrete remained flat. The results will help develop an optimal mix design of Class CI ﬂy ash with moderate calcium oxide in the production of geopolymer concrete. This will improve the future applications of using this process in new binding materials. Doi: 10.28991/CEJ-2022-08-09-012 Full Text: PDF

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Section: Compressive Strengthsupporting

confidence: 91%

Section: Figure 5 the Filling Concept Of Paste In Geopolymer Mortarmentioning

confidence: 99%

Effect of the Mortar Volume Ratio on the Mechanical Behavior of Class CI Fly Ash-Based Geopolymer Concrete

et al. 2022

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“…The mechanical strength of a geopolymer is affected by various factors, including the type of alkali activator [ 36 ], the content [ 37 , 38 ] and the modulus of the alkali activator [ 39 , 40 ], the type and content of cementitious materials [ 41 , 42 ], the curing conditions [ 43 , 44 ], etc. In the present study, the raw materials for the preparation of the geopolymer were used as variables according to a three-factor and four-level test design.…”

Section: Methodsmentioning

confidence: 99%

Prediction of Compressive Strength of Fly Ash-Slag Based Geopolymer Paste Based on Multi-Optimized Artificial Neural Network

et al. 2023

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The fly ash-slag geopolymer is regarded as one of the new green cementitious materials that can replace cement, but it is difficult to predict its mechanical properties by conventional methods. Therefore, in the present study, the back propagation (BP) artificial neural network technique is used to predict the compressive strength of the fly ash-slag geopolymer. In this paper, data from the published literature were collected as the training set and the experimental results from laboratory experiments were used as the test set. Eight input parameters were determined, as follows: the percentage of fly ash, the percentage of slag, the water–cement ratio, the curing age, the modulus of alkali activator, the mass ratio of NaOH to Na2SiO3 and the moles of Na2O and SiO2 in the alkali activator. Three multilayer artificial neural network models were constructed using the Levenberg–Marquardt (LM), Bayesian regularization (BR) and scaled conjugate gradient (SCG) algorithms to compare the prediction accuracy of the compressive strength of the fly ash-slag geopolymer paste at different ages (3, 7, and 28 d). It was concluded that the training set error of the BR–BP neural network was the smallest. Ultimately, the hyperparameter optimization of the BR–BP neural network was carried out to compare the training set and the test set errors before and after the optimization, and the results show that the BR–BP neural network model with hyperparameter optimization had the highest prediction accuracy.

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“…The concentration of the alkali solution has a major effect on the characteristics of geopolymers, particularly during raw material dissolution to generate monomers. A slight modification of the molarity of NaOH utilized can significantly affect the characteristics of geopolymers, particularly their mechanical properties [ 73 , 74 , 75 ].…”

Section: Geopolymers As Artificial Aggregatesmentioning

confidence: 99%

Geopolymer-Based Artificial Aggregates: A Review on Methods of Producing, Properties, and Improving Techniques

et al. 2022

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The depletion of aggregate-related natural resources is the primary concern of all researchers globally. Recent studies emphasize the significance of recycling and reusing various types of natural or by-product material waste from industry as a result of the building industry’s rising demand for aggregate as the primary component in concrete production. It has been demonstrated that the geopolymer system has exceptional features, such as high strength, superior durability, and greater resistance to fire exposure, making it a viable alternative to ordinary Portland Cement (OPC) concrete. This study will examine the present method utilized to generate artificial aggregate-based geopolymers, including their physical and mechanical properties, as well as their characterization. The production process of geopolymer derived from synthetic aggregates will be highlighted. In conjunction with the bonding of aggregates and the cement matrix, the interfacial transition zone (ITZ) is highlighted in this work as an additional important property to be researched in the future. It will be discussed how to improve the properties of geopolymers based on artificial aggregates. It has been demonstrated that cold bonding provides superior qualities for artificial aggregate while conserving energy during production. The creation of ITZ has a significant impact on the bonding strength between artificial aggregates and the cement matrix. Additionally, improvement strategies demonstrate viable methods for enhancing the quality of manufactured aggregates. In addition, other recommendations are discussed in this study for future work.

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The Investigation on Setting Time and Strength of High Calcium Fly Ash Based Geopolymer

Cited by 12 publications

References 12 publications

Effect of the Mortar Volume Ratio on the Mechanical Behavior of Class CI Fly Ash-Based Geopolymer Concrete

Effect of the Mortar Volume Ratio on the Mechanical Behavior of Class CI Fly Ash-Based Geopolymer Concrete

Prediction of Compressive Strength of Fly Ash-Slag Based Geopolymer Paste Based on Multi-Optimized Artificial Neural Network

Geopolymer-Based Artificial Aggregates: A Review on Methods of Producing, Properties, and Improving Techniques

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