Development of alkali-activated binder using hwangtoh without calcination

Kim, Baek Joong; Yi, Chongku; Kang, Kyung-In

doi:10.1016/j.conbuildmat.2014.02.003

Cited by 13 publications

(8 citation statements)

References 30 publications

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“…The geopolymer compressive strength depends notably on the nature of the aluminosilicate source, the type and concentration of the alkaline activator used, and the duration and the temperature of the curing [13] [16], this last activator is the most used because it is the cheapest, and the most available [13]. Most studies on geopolymers are focused on their mechanical properties and the chemical reactions, while information on their drying kinetics is scarce.…”

Section: Introductionmentioning

confidence: 99%

NaOH Activation of Raw Soils: Effect of NaOH Content on the Drying Kinetic and Its Modelling

Bouyila¹,

Elenga²,

Ahouet³

et al. 2019

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NaOH activation of soils is an affordable and promising way to improve mechanical properties of earthen bricks. If for well-activated geopolymers, the hard polymeric network limits the influence of water on mechanical properties, for the weakly activated one, as non-calcined raw clayey soils, the influence of water on these properties would be more critical. This work aims to determine the effect of sodium hydroxide concentration on the drying kinetics of bricks made with raw clayey soils, and to model this kinetics. The results show that the drying kinetics is governed by the diffusion of water due to the absence of free water. The drying duration increases linearly with the increasing of NaOH content, while the volumetric shrinkage decreases, probably thanks to the reduction of the material porosity during the formation of the zeolitic structures. Besides, the drying duration is strongly and negatively correlated with the initial drying rate (−0.97) and bricks did not show visible cracks. Among the five parametric models tested, the Khazaei's model is the best in terms of all statistical criteria considered. For all models used, the coefficient of determination is ranged from 0.993 to 0.999, and the evolution of the models' parameters is in accordance with that of the drying kinetics observed.

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Section: Introductionmentioning

confidence: 99%

NaOH Activation of Raw Soils: Effect of NaOH Content on the Drying Kinetic and Its Modelling

Bouyila¹,

Elenga²,

Ahouet³

et al. 2019

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“…However, the heated clay with or without the OPC has a shortcoming of high energy consumption. The application of the geopolymer reaction using alkali activators is another interesting approach [23]. However, this also has disadvantages, such as significant workability loss because of rapid reaction, the hazard of handling an alkali solution, and high cost [31,32].…”

Section: Introductionmentioning

confidence: 99%

“…As a sustainable building material, kaolinite clay (also known as hwangtoh clay in Korea) has been used for more than 1500 years in traditional houses in Korea, where there are enough reserves [23]. It consists primarily of kaolinite and quartz.…”

Section: Introductionmentioning

confidence: 99%

“…It consists primarily of kaolinite and quartz. Owing to its abundance and sustainable benefit, it has been studied by Korean researchers as a potential supplementary or main building material [23,24]. The well-known advantages as a building material include high heat-storing capacity and its purifying, deodorizing, and antibiotic properties [25].…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, when heating through Ondol (traditional floor heating system in Korea), the infrared radiation emission from the clay was confirmed to be beneficial to the human body [25]. With these advantages, it has been used as plastering, flooring, and finishing materials for buildings up to the present time [23,26]. From a mix design perspective, the clay has been customarily mixed with sand and lime [27], as stated in Korean building standards [28].…”

Section: Introductionmentioning

confidence: 99%

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Intensified Pozzolanic Reaction on Kaolinite Clay-Based Mortar

et al. 2017

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Abstract:The objective of this study is to develop and characterize kaolinite clay-based structural mortar. The pozzolanic reaction induced from two mineral additives, i.e., calcium hydroxide and silica fume (SF), and the physical filling effect from SF, were found to be effective on the enhancement of structural properties. Based on several preliminary experiments, 7:3 ratio of kaolinite clay/calcium hydroxide was selected as a basic binder. Then, the amount of SF was chosen as 0%, 7.5%, and 15% of the total binder to consider both the chemical and physical effects. The results showed that compressive strengths of samples with 7.5% and 15% SF are significantly increased by approximately 200% and 350%, respectively, at 28 days compared to the sample without SF. However, based on the results of the sample with 15% SF, it is found that excessive addition of SF causes long-term strength loss, possibly owing to micro cracks. With the careful consideration on this long-term behavior, this suggested new mix design can be further extended to develop sustainable structural materials using natural minerals or waste materials with nonbinding properties.

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Climatic cycling assessment of red clay/perlite and vermiculite composite PCM for improving thermal inertia in buildings

Yang

Park

et al. 2020

Building and Environment

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Development of alkali-activated binder using hwangtoh without calcination

Cited by 13 publications

References 30 publications

NaOH Activation of Raw Soils: Effect of NaOH Content on the Drying Kinetic and Its Modelling

NaOH Activation of Raw Soils: Effect of NaOH Content on the Drying Kinetic and Its Modelling

Intensified Pozzolanic Reaction on Kaolinite Clay-Based Mortar

Climatic cycling assessment of red clay/perlite and vermiculite composite PCM for improving thermal inertia in buildings

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