Open AccessInfluence of TiO2 nanoparticles (wt%) onto the physical and mechanical properties of the TiO2-geopolymer paste
Author(s) -
Norsuria Mahmed,
Siti Nor Saffirah Zailan,
Mohd Mustafa Al-Bakri Abdullah
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/864/1/012177
Subject(s) - materials science , geopolymer , nanoparticle , economies of agglomeration , compressive strength , microstructure , absorption of water , chemical engineering , nanocomposite , phase (matter) , alkali metal , composite material , nanotechnology , chemistry , organic chemistry , engineering
The TiO 2 -geopolymer paste had been prepared by dry-mixing of the fly ash with various concentration (wt%) of TiO 2 nanoparticles (2.5%, 5.0%, 10.0% and 15.0%). Those powder mixtures were then mixed with the alkali activator with the ratio of 2.5 and were cured at room temperature for 28 and 640 days. The phase and chemical bonding analysis revealed that the incorporation of TiO 2 nanoparticles did not create any additional phase or functional group, but only physical interaction might have occurred in between the TiO 2 and geopolymer matrix. However, the physical properties were depending on the TiO 2 nanoparticles content where setting time of the geopolymer can be shortened by the addition of certain amount of TiO 2 nanoparticles (up to 5.0 wt%). The water absorption also increased as a function of TiO 2 content, due to the formation of the micro cracks as a result from the agglomeration of TiO 2 nanoparticles. The compressive strength reaches its maximum value, 85.9 MPa with 5.0 wt% of TiO 2 nanoparticles. Beyond 5wt%, the strength decreased almost half of the maximum value, where agglomeration becomes a main factor. While for 640 days of ageing, sample with 15.0 wt% shows triple increment from 30.6 MPa to 95.3 MPa.