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Alkali-activated soapstone waste - mechanical properties, durability, and economic prospects
- Publication Year :
- 2019
- Publisher :
- Elsevier, 2019.
-
Abstract
- Soapstone is a soft, magnesium-rich mineral widely used in the production of carved objects and architectural elements, for instance. The processing of soapstone causes the formation of significant amounts of waste powder, which is largely landfilled at the moment. The aim of the present study is to evaluate the suitability of soapstone waste as the main binder for the alkali-activation process using sodium silicate and hydroxide solutions as activators. The results demonstrate that soapstone alone reacts to some extent (compressive strength of 13 MPa at 28 day age), but mechanical properties are improved significantly after replacing 20% of soapstone by metakaolin (compressive strength of 31 MPa at 28 d age). The obtained mechanical properties are closely similar to those of virgin soapstone. Durability properties of the developed alkali-activated binders were similar or better than typical Portland cement-based binders in terms of high temperature, acid, and freeze-thaw resistance, and sorptivity. The material costs alkali-activated soapstone mortar were estimated as approximately 70 €/t. Thus, the results enable utilizing currently underexploited soapstone waste in a sustainable and economically interesting way.
- Subjects :
- Materials science
Sorptivity
Sodium silicate
02 engineering and technology
010402 general chemistry
Geopolymer
01 natural sciences
Industrial and Manufacturing Engineering
Durability
law.invention
chemistry.chemical_compound
law
General Materials Science
Waste Management and Disposal
Soapstone
Metakaolin
Steatite
Renewable Energy, Sustainability and the Environment
Metallurgy
Alkali-activation
021001 nanoscience & nanotechnology
0104 chemical sciences
Portland cement
Compressive strength
chemistry
Alkali activated
Mortar
0210 nano-technology
Saponite
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....1b4d182ea750ae003c272aeb2831c219