The importance of specific surface area in the geopolymerization of heated illitic clay

Dietel, Jan; Warr, Laurence N.; Bertmer, Marko; Steudel, Annett; Grathoff, Georg; Emmerich, Katja

doi:10.1016/j.clay.2017.01.001

Cited by 63 publications

(21 citation statements)

References 29 publications

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“…The clay samples were dried in an oven at 80°C prior to grinding. Calcination was then carried out in an electric furnace at 800°C for 5 h. Depending on the clay composition, the calcination temperature commonly varies between 600°C and 900°C (Mohammed, 2017) and enhances reactivity in an alkaline environment due to structural breakdown of clay minerals subsequent to dehydroxylation (He et al , 1995; Sabir et al , 2001; Dietel et al , 2017). Prior to mixing with the alkaline activator, the clay samples were blended with waste marble powder.…”

Section: Experimental Methods and Materials Characterizationmentioning

confidence: 99%

Potential use of Kebilian clay reserves(southern Tunisia)for the production of geopolymer materials

et al. 2020

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The aim of this study was to help drive the Tunisian construction industry towards a more sustainable approach given the existence of abundant local raw material deposits that could be exploited for the production of low-CO2 binders. Various clay sediments from the Kebili region (southern Tunisia) were characterized by chemical analysis, X-ray diffraction, thermal analysis and geotechnical tests to determine their suitability for the preparation of geopolymer binders. The clays consist of illite and kaolinite with other accessory minerals. To test the possibility of using these materials as precursors for the production of low-CO2 and low-cost geopolymers, the raw samples were calcined and activated by addition of solid sodium silicate. Compressive strength tests performed on four alkali-activated clays show that promising mechanical performance may be achieved, with mechanical strength values as high as 25 MPa after 7 days, depending on the clay composition. The mechanical strength is related to the SiO2:Al2O3 and Al2O3:(NaO2 + K2O) ratios. Careful selection of the raw materials is, therefore, an essential step in the exploitation of clay deposits to be used for the production of ecological materials such as geopolymers.

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Section: Experimental Methods and Materials Characterizationmentioning

confidence: 99%

Potential use of Kebilian clay reserves(southern Tunisia)for the production of geopolymer materials

et al. 2020

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“…The selection of precursors available for use in alkali-activation has also broadened significantly in recent years, with particular emphasis being placed upon the use of materials for which there is not strong competition in demand from utilization in blends with Portland cement. For example, calcined non-kaolinitic clays [17][18][19][20], palm oil fuel ash [21,22] or other minerals [23][24][25][26], have been shown to yield alkali-activated binder systems with technical properties that are attractive in given applications. Various industrial by-products or wastes without current large-scale utilization as supplementary cementitious materials have been tested and validated for use in alkali-activated binders, including red mud [27][28][29] and various glassy wastes including slags, some of which can benefit from thermal re-processing or modification to improve their reactivity before use [10,[30][31][32][33][34][35].…”

Section: Precursorsmentioning

confidence: 99%

Recent progress in low-carbon binders

Shi

Provis

2019

Cement and Concrete Research

460

131

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The development of low-carbon binders has been recognized as a means of reducing the carbon footprint of the Portland cement industry, in response to growing global concerns over CO2 emissions from the construction sector. This paper reviews recent progress in the three most attractive low-carbon binders: alkali-activated, carbonate, and belite-ye'elimite-based binders. Alkali-activated binders/materials were reviewed at the past two ICCC congresses, so this paper focuses on some key developments of alkali-activated binders/materials since the last keynote paper was published in 2015. Recent progress on carbonate and belite-ye'elimite-based binders are also reviewed and discussed, as they are attracting more and more attention as essential alternative low-carbon cementitious materials. These classes of binders have a clear role to play in providing a sustainable future for global construction, as part of the available toolkit of cements.

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“…The mineralogical composition of the clay sample is determined by X-ray diffraction technology, which allows the determination of the different crystalline mineral phases present in the sample. The equipment used is the D8 Advance BRUKER AXS energy dispersive diffractometer (Dietel et al 2017). The Figure 2 shows the diffraction diffractograms of the studied earth.…”

Section: Mineralogical Compositionmentioning

confidence: 99%

Energy Efficiency of a Vernacular Building Design and Materials in Hot Arid Climate: Experimental and Numerical Approach

Azhary

Ouakarrouch

Laaroussi

et al. 2021

Int. J. Renew. Energy Dev.

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Morocco faces tremendous climate constraints; the climate is hot and dry in most parts of the country, and when selecting an energy-saving approach, the architectural landscape becomes essential.Designer and building professionals seem to have neglected this large-scale integration. Sustainable development programs in terms of sustainable architecture are ongoing in countries around the world. One part of this trend is the growing concern shown in the high environmental efficiency of vernacular architecture. It is within this prescriptive framework that this research study is being conducted, which reveals novel architectural style integrating thermal comfort, energy efficient characteristics, passive solar elements architecture, and construction techniques inspired from the vernacular Ksourian architectural configurations. The goal of the present research study is to identify features of energy efficient vernacular architecture and thermal performances that affect indoor thermal comfort conditions for adaptation to current lifestyles in modern architecture. The key characteristics developed are; built mass structure, building orientation, space planning, availability of s, building techniques, and new coating materials for manufacturing and roofing. The suggested methodology enables to analyze the thermal performance analysis, applying an experimental research using experimental testing measurement and comparative optimization processes for thermal efficiency and comfort evaluation of a traditional vernacular earthen house.Series of experimental thermophysical characterization measurements have been carried out in order to quantify on a real scale the thermophysical properties that characterize the Rissani earth. Thusthermophysical characterization results are operated as input data for the thermal dynamic simulation for the purpose to evaluate thermal performances and comfort under the weather conditions and control natural comfort in both summer and winter, without using heating or cooling systems. Ultimately, the simulations carried out make it possible to identify the optimal orientation, revealing an effective decrease in interior temperatures during summer and providing good thermal comfort in winter.

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The importance of specific surface area in the geopolymerization of heated illitic clay

Cited by 63 publications

References 29 publications

Potential use of Kebilian clay reserves(southern Tunisia)for the production of geopolymer materials

Potential use of Kebilian clay reserves(southern Tunisia)for the production of geopolymer materials

Recent progress in low-carbon binders

Energy Efficiency of a Vernacular Building Design and Materials in Hot Arid Climate: Experimental and Numerical Approach

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