Effect of various alkaline binder ratio on geopolymer concrete under ambient curing condition

Rao, A. Krishna; Kumar, D. Rupesh

doi:10.1016/j.matpr.2020.03.682

Cited by 22 publications

(7 citation statements)

References 9 publications

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“…A lower W/B ratio provides less water for the reaction, which can result in incomplete hydration and geopolymerization, leading to lower strength. On the other hand, a higher W/B ratio can lead to excessive porosity and weaker bonds between particles, thus reducing the strength [72]. Therefore, the W/B ratio should be selected carefully in engineering considering the workability, density and strength of the ternary geopolymers.…”

Section: Ucs Of the Ternary Geopolymermentioning

confidence: 99%

Multi-objective optimization of ternary geopolymers with multiple solid wastes using machine learning and NSGA-II

Zhang,

Shang,

Huo

et al. 2024

Preprint

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The design of the mixtures of the ternary geopolymer is challenging due to the need to balance multiple objectives, including cost, strength, and carbon emissions. In order to address this multi-objective optimization (MOO) problem, machine learning models and the NSGA-II algorithm are employed in this study. To train the machine learning models, namely Artificial Neural Network (ANN), Support Vector Regressor, Extremely Randomized Tree, and Gradient Boosting Regression, 120 uniaxial compressive strength (UCS) values of ternary geopolymers with fly ash (FA), granulated blast furnace slag (GBFS) and steel slag (SS) as precursor materials were obtained from laboratory tests. Results show that the ternary geopolymer with the ratio of FA:GBFS:SS of 2:5:3 has the highest 28-d UCS of 46.8 MPa. The predictive accuracy of the ANN model is the highest with R = 0.949 and RMSE = 3.988MPa on the test set. Furthermore, the Shapley Additive Explanations analysis indicates that precursor materials exhibit the most significant influence on the UCS, particularly the content of GBFS. Based on the ANN model and NSGA-II algorithm, a multi-objective optimization (MOO) model is developed to optimize simultaneously the strength, cost and carbon emission of the ternary geopolymer. The derived MOO model can be used to design mixtures of other cementitious materials with multiple objectives.

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Section: Ucs Of the Ternary Geopolymermentioning

confidence: 99%

Multi-objective optimization of ternary geopolymers with multiple solid wastes using machine learning and NSGA-II

Zhang,

Shang,

Huo

et al. 2024

Preprint

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“…Much research works on fly ash-based geopolymer concrete was carried out mainly using low-calcium fly ash [12][13][14]. The disadvantage of using low-calcium fly ash is the requirement of high drying temperatures for curing, which limits cast-in-place applications [15]. So, the development of geopolymer concrete cured at ambient temperature is currently growing.…”

Section: Introductionmentioning

confidence: 99%

“…GGBS, often called slag, can be a key to such development. Slag is a non-metallic product resulting from the residue of blast furnace combustion in the manufacture of refined iron in granular form [15]. This granular material contains CaO, MgO, SiO2, and Al2O3 [16].…”

Section: Introductionmentioning

confidence: 99%

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Properties of Fly Ash-Slag-Based Geopolymer Concrete with Low Molarity Sodium Hydroxide

et al. 2023

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Most geopolymer concrete is produced using low-calcium fly ash and cured at high drying temperatures. Additionally, the activator is prepared with a sodium hydroxide (SH) solution of high molarity. This research proposes using a low molarity SH solution to produce fly ash-slag-based geopolymer concrete cured at room temperature. The properties to be investigated include workability, water absorption, and compressive strength. The influence of mixture composition, i.e., slag content, sodium silicate to sodium hydroxide (SS/SH) ratio, and alkaline activator to binder (Al/Bi) ratio on those properties is of interest. The slag substituted fly ash at 10, 20, 30, 40, and 50% replacement levels. The SS/SH ratio is 1.0, 1.5, and 2.0, with the SH molarity determined at 2M. The Al/Bi ratio is 0.40, 0.45, and 0.50. The results show that a higher percentage of slag reduces slump and water absorption but increases the compressive strength of the geopolymer concrete. The mixtures suitable for use are at the percentages of slag 20, 30, and 40%. An increase in the SS/SH ratio decreases the slump and water absorption. Geopolymer concrete with an SS/SH ratio of 1.5 gives maximum compressive strength compared to the other ratios. Increasing the ratio of Al/Bi increases the workability of geopolymer concrete. At an Al/Bi ratio of 0.45, the compressive strength is maximum and the water absorption is minimum. The recommended mix design in terms of workability, water absorption, and compressive strength of geopolymer concrete is a mixture with slag contents of 20, 30, and 40%, a SS/SH ratio of 1.0 and 1.5, and an Al/Bi ratio of 0.45 and 0.50. Doi: 10.28991/CEJ-2023-09-02-010 Full Text: PDF

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“…Marble dust as a binder and sand substitute was studied on mechanical and durability properties. Most of the studies have had favorable results [31]. This application may be utilized to minimize the cost of GPC manufacturing by using waste marble dust as an additive ingredient, affecting mortar mechanical performance [32].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of structural performances of metakaolin based geopolymer concrete

Shilar

Ganachari

Patil

et al. 2022

Journal of Materials Research and Technology

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Effect of various alkaline binder ratio on geopolymer concrete under ambient curing condition

Cited by 22 publications

References 9 publications

Multi-objective optimization of ternary geopolymers with multiple solid wastes using machine learning and NSGA-II

Multi-objective optimization of ternary geopolymers with multiple solid wastes using machine learning and NSGA-II

Properties of Fly Ash-Slag-Based Geopolymer Concrete with Low Molarity Sodium Hydroxide

Evaluation of structural performances of metakaolin based geopolymer concrete

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