TY - EJOU
AU - Hsieh, Yi-Che
AU - Cheng, Ta-Wui
AU - Wu, Chia-Ho
TI - Feasibility Study on Fabrication of Geopolymer Bricks by Wasted Grinding Wheel at Room Temperature
T2 - Journal of Renewable Materials
PY - 2020
VL - 8
IS - 12
SN - 2164-6341
AB - In this study, the feasibility of producing eco-friendly bricks by using
geopolymer technology and a waste grinding wheel (WGW) from the grinding
wheel industries was investigated. Nowadays, in order to meet industrial needs,
for instance, in Taiwan, approximately 500,000 grinding wheels are used
annually. That is, a large number of “waste” grinding wheels are produced.
Furthermore, few studies have been conducted on the use of WGWs as raw materials in geopolymer applications. The use of geopolymer technology to form
bricks can avoid the utilization of clay and cement and even prevent the use of
a high-temperature process in kilns. Moreover, it can decrease CO2 emission
and energy consumption and thus, protect the environment. In this study, the following three major factors were considered: press-forming pressure (70 and 100
kgf/cm2
), NaOH molar concentration (2 and 4M), and the ratio of binder fineaggregate (1:3, 1:4, and 1:5). Under these conditions, the specimens were tested
using the compressive strength test, water absorption test, microstructure analysis,
a freezing–thawing test and toxicity characteristic leaching procedure test. The
optimal formulation was composed of 1:4 binder fine-aggregate ratio, 4M NaOH
concentration, and 100-kgf/cm2 pressure. Furthermore, we used a WGW and
achieved a compressive strength of 50.6 MPa after 28 days, which was greater
than 32 MPa and conformed to the Grade A brick standard of National Standards
of the Republic of China (13295). In conclusion, this brick fabrication method
based on geopolymer technology was not only beneficial to the environment
but also improved the efficiency of reutilizing WGW.
KW - Geopolymer; waste grinding wheel; geopolymer bricks
DO - 10.32604/jrm.2020.013353