TY  - JOUR
U1  - Zeitschriftenartikel, wissenschaftlich - begutachtet (reviewed)
A1  - Walbrück, Katharina
A1  - Drewler, Lisabeth
A1  - Witzleben, Steffen
A1  - Stephan, Dietmar
T1  - Factors influencing thermal conductivity and compressive strength of natural fiber-reinforced geopolymer foams
JF  - Open Ceramics
N2  - New sustainable, environmentally friendly materials for thermal insulation of buildings are necessary to reduce their carbon footprints. In this study, Miscanthus fiber-reinforced geopolymer composites, foamed with sodium dodecyl sulfate (SDS), were developed using fly ash as a geopolymer precursor. The effects of fiber content, fiber size, curing temperature, foaming agent content, fumed silica specific surface area and fumed silica content on thermal conductivity and compressive strength were evaluated using a Plackett-Burman design of experiment. Furthermore, the microstructure of geopolymer composites was investigated using X-ray diffraction (XRD), X-ray micro-computed tomography (μCT) and scanning electron microscopy (SEM). The measured characteristic values were in the following ranges: Thermal conductivity 0.057 ​W ​(m ​K)−1 to 0.127 ​W ​(m ​K)−1, compressive strength 0.007 ​MPa–0.719 ​MPa and porosity 49 ​vol% to 76 ​vol%. The results reveal an enhancement of thermal conductivity by elevated fiber size and foaming agent content. In contrast, the compressive strength is enhanced by high fiber content. Additionally, SEM images indicate a good interaction between the fibers and the geopolymer matrix, because nearly the whole fiber surface is covered by the geopolymer.
KW  - Geopolymer
KW  - Foaming
KW  - Fiber reinforcement
KW  - Miscanthus
KW  - Thermal conductivity
KW  - Compressive strength
UN  - https://nbn-resolving.org/urn:nbn:de:hbz:1044-opus-53247
SN  - 2666-5395
SS  - 2666-5395
U6  - https://doi.org/10.1016/j.oceram.2021.100065
DO  - https://doi.org/10.1016/j.oceram.2021.100065
VL  - 5
IS  - March 2021
PB  - Elsevier
CY  - Amsterdam
ER  -