Mechanochemically activated clay as asustainable cementitious binder

Document identifier: oai:DiVA.org:ltu-76601
Keyword: Engineering and Technology, Civil Engineering, Construction Management, Teknik och teknologier, Samhällsbyggnadsteknik, Byggproduktion, Alternative cementitious binders, Mechanochemical activation, Sustainable building materials, Mechanochemistry, Clay., Byggmaterial, Building Materials
Publication year: 2019
Relevant Sustainable Development Goals (SDGs):
SDG 9 Industry, innovation and infrastructure
The SDG label(s) above have been assigned by OSDG.ai

Abstract:

High-temperature requirements, emission of hazardous substances from cement kilns and the significantCO2 footprint in the calcination step are factors requiring special attention in the cement industry. Local andcommonly occurring clays can be a sustainable alternative for producing cementitious binders. Structuraldisorder in natural clay minerals can be induced through mechanochemical activation (MCA), by whichthe material develops an enhanced reactivity. The treatment of a Swedish natural clay through intensivegrinding is carried out in order to assess its potential as a sustainable cementitious binder. Several grindingparameters influence a MCA product. The filling ratio of the jar, the rotation speed, the time of grinding,as well as wet and dry environment, are variated to optimize the MCA process. The MCA process doesnot require high temperatures or added chemicals and shorter processing times can avoid high-energyrequirements during fine grinding. The structural changes of the clay were analysed by X-Ray Diffraction(XRD). Analysis of the particle size distribution of the raw and processed clay suggested a correlation withthe grinding duration. An increased ratio of grinding media versus the amount of ground material, whilelonger grinding duration increased the overall efficiency of the MCA process. The strength activity index(SAI) indicated an enhanced pozzolanic activity for the mechanochemically processed clay. Compressivestrength tests have shown a strong correlation between an enhanced amorphization rate and increasedcompressive strength values.

Authors

Ilda Tole

Luleå tekniska universitet; Institutionen för samhällsbyggnad och naturresurser; Building Materials
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Karin Habermehl-Cwirzen

Luleå tekniska universitet; Byggkonstruktion och brand
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Andrzej Cwirzen

Luleå tekniska universitet; Byggkonstruktion och brand
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