Synergic effect of fly ash and calcium aluminate cement on the properties of pumice-based geopolymer mortar

Karaaslan, Cemal; Yener, Engin; Bağatur, Tamer; Polat, Rıza; Gül, Rüstem; Alma, Mehmet Hakkı

doi:10.1016/j.conbuildmat.2022.128397

Cited by 16 publications

(2 citation statements)

References 53 publications

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“…AAS/geopolymer binders require heat curing to achieve sufficient mechanical properties, typically ranging from a few hours to a few days, with curing temperatures usually falling between 40°C and 90°C [5,6]. Geopolymers produced with high calcium content binders, in other words alkaliactivated cements, have been shown to reach acceptable strength levels within reasonable timeframes at room temperatures [7]. However, heat curing has been found to accelerate the strength development and improve the mechanical properties of alkali-activated cements [8].…”

Section: Introductionmentioning

confidence: 99%

Malzemelerin Isıtılarak Kullanılması ile Alkali-Aktive Cürufların Erken-dönem Dayanım Gelişimlerinin İyileştirilmesi

KARAASLAN

2023

Çukurova Üniversitesi Mühendislik Fakültesi Dergisi

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Alkali-activated cements have gained attention as sustainable alternatives to Portland cement-based concretes. This study aims to enhance the early strength development of alkali-activated slag (AAS) mortars by preheating the alkali activator, ground granulated blast furnace slag, and aggregates to temperatures reaching up to 65°C before their utilization. Preheating at 50°C enhances both early and ultimate strength of AAS, compared to specimens that were not subjected to preheating. Similarly, preheating at 65°C results in a substantial increase in early strength but leads to some strength reduction after three days. SEM and FTIR analyses reveal that preheating at 50°C improves the interfacial transition zone between paste and aggregate, reduces microcracks, and promotes alkali activation. Furthermore, FTIR analysis confirms the occurrence of hydration reactions in AAS upon contact with water.

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Section: Introductionmentioning

confidence: 99%

Malzemelerin Isıtılarak Kullanılması ile Alkali-Aktive Cürufların Erken-dönem Dayanım Gelişimlerinin İyileştirilmesi

KARAASLAN

2023

Çukurova Üniversitesi Mühendislik Fakültesi Dergisi

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“…3D printing of concrete considers extrudability, constructability, and ease of implementation as the performance indices. The cement used here (RSC42.5 grade fast hard-sulfur aluminate cement) [27] is produced by Wuxi Chengde Yue Building Materials Co., LTD. The main performance indicators are shown in Table 1.…”

Section: Introduction Of Equipmentmentioning

confidence: 99%

Research on the Preparation and Mechanical Properties of Solidified 3D Printed Concrete Materials

et al. 2022

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Three-dimensional (3D) printing is an innovative manufacturing process based on 3D digital models that involves layer-by-layer addition of materials. In recent years, 3D printing has made good progress in the field of construction, thereby leading to more stringent requirements for materials. In this study, we first compare different equipment and materials used for 3D printing concrete. Subsequently, the mix ratio of extruded and cured 3D printed concrete is studied by using flow and slump as the main evaluation indexes. Through a universal test, the influence of different dosages of water reducer, retarder, and latex powder on the performance of 3D printed concrete (compression resistance strength) is studied. Furthermore, the optimum mix ratio for fiber reinforced concrete is determined, based on which axial pull-out, axial compression, and three-point bending tests are performed to elucidate the peak compressive strength, load–displacement curve, and mechanical properties of 3D printed concrete. By employing the ABAQUS finite element software, the shaft pulling force and axial compression of 3D printed concrete are simulated and analyzed to determine the parameters influencing the bonding performance of different 3D printed concrete layers. Moreover, the influence of water reducer and sand–glue ratio is observed to be greater than that of water gel ratio and sodium gluconate. The testing results showed that the mechanical strength of 3D printed concrete is lower than that of poured concrete. Meanwhile, bending and compressive strengths of 3D printed concrete and poured concrete are quite different.

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Integrated approach to assessing strength in slag-based geopolymer mortars: experimental study and modeling with advanced techniques

KILIÇARSLAN,

BINGOL

2024

J Mater Sci

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The study consists of two main parts. In the initial phase, a variety of slag-based geopolymer mortars with different activator concentrations were prepared. These mortars underwent curing in both water and air environments for periods of 3, 7, 28, and 90 days, after which their compressive strength was evaluated at the conclusion of each curing interval. The second phase of the study is dedicated to the development of innovative models for estimating the compressive strength based on the data gathered. To achieve this, a range of techniques including multi-gene genetic programming (MGGP), artificial neural networks (ANN), XGBoost, SVM-Gauss, long short-term memory (LSTM), and convolutional neural networks (CNN) were employed to formulate a model capable of estimating compressive strength accurately. The study made use of various performance evaluation metrics such as mean squared error (MSE), root mean squared error (RMSE), R-squared, mean absolute error (MAE), and scatter index (SI) to assess the precision of the MGGP method in evaluating slag-based geopolymer mortars under both water and air curing conditions. The findings indicate that the equations generated by the MGGP method exhibit a high level of precision when juxtaposed with experimental outcomes. This research endeavors to enhance the prediction of compressive strength in geopolymer mortars, a subject that has garnered significant interest in scholarly literature.

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Synergic effect of fly ash and calcium aluminate cement on the properties of pumice-based geopolymer mortar

Cited by 16 publications

References 53 publications

Malzemelerin Isıtılarak Kullanılması ile Alkali-Aktive Cürufların Erken-dönem Dayanım Gelişimlerinin İyileştirilmesi

Malzemelerin Isıtılarak Kullanılması ile Alkali-Aktive Cürufların Erken-dönem Dayanım Gelişimlerinin İyileştirilmesi

Research on the Preparation and Mechanical Properties of Solidified 3D Printed Concrete Materials

Integrated approach to assessing strength in slag-based geopolymer mortars: experimental study and modeling with advanced techniques

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