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Publikācija: Waste Stream Porous Alkali Activated Materials for High Temperature Application

Publication Type Scientific article indexed in SCOPUS or WOS database
Funding for basic activity Research project
Defending: ,
Publication language English (en)
Title in original language Waste Stream Porous Alkali Activated Materials for High Temperature Application
Field of research 2. Engineering and technology
Sub-field of research 2.1. Construction and transportation engineering
Research platform Materials, Processes, and Technologies
Authors Diāna Bajāre
Laura Vītola
Laura Dembovska
Ģirts Būmanis
Keywords alkali activated material; porous materials; heat resistance; application in high temperature; aluminum scrap recycling waste
Abstract The growing interest of using industrial waste as recycled rawmaterials for the production of new, innovative materials is associated with effective use of natural resources and circular (zero-waste) economy. The research object is waste stream materials coming from chemical and processing industries, such as aluminum scrap recycling waste, chamotte-like precursor, firebricks sawing residues, and their use in production of high-temperature resistant, porous insulation materials by using alkali activation technique with 6M NaOH solution. Adding aluminum scrap recycling waste to the composition of the tested alkali activated materials (AAM) contributed to the porous structure of the material with the pore size ranging from 1,000 to 5,000 mu m (detected by Micro-XCT, SEM). Lightweight (350-850 kg/m(3)) and heat-resistant (up to 1,000 degrees C) AAM with compressive strength from 1.0 to 3.0 MPa was obtained. The mineralogical composition of the obtained AAM was detected (XRD) and the heat resistant minerals in the structure of AAM were identified. It was concluded that the increased amount of Al2O3 in the rawmaterial composition resulted in improved thermal stability of the AAM. In case where SiO2/Al2O3 ratio is <2, the formation of high-temperature resistant minerals, such as carnegeite and nepheline, was observed. The obtained AAM could resist up to 8 thermal shock cycles and it could be easily adapted to the industrial production and application such as thermal insulation layer in laboratory furnaces.
DOI: 10.3389/fmats.2019.00092
Hyperlink: https://www.frontiersin.org/articles/10.3389/fmats.2019.00092/full 
Reference Bajāre, D., Vītola, L., Dembovska, L., Būmanis, Ģ. Waste Stream Porous Alkali Activated Materials for High Temperature Application. Frontiers in Materials, 2019, Vol. 6, pp.92-92. ISSN 2296-8016. Available from: doi:10.3389/fmats.2019.00092
ID 29293