TY - JOUR
T1 - Dispersion of graphene oxide agglomerates in cement paste and its effects on electrical resistivity and flexural strength
AU - Li, Xiangyu
AU - Wang, Linhao
AU - Liu, Yuqing
AU - Li, Wengui
AU - Dong, Biqin
AU - Duan, Wen Hui
PY - 2018/9/1
Y1 - 2018/9/1
N2 - Actual dispersion of graphene oxide (GO) in cement paste was investigated by using both X-ray computed tomography and X-ray photoelectron spectroscopy. It was found that GO nanosheets are mainly agglomerated, as an individual phase, with platelet-like morphology and little GO being absorbed onto surfaces of cement particles and hydration products. By performing an electrical resistivity test, GO agglomerates are found to be more electrically insulative than cement paste. Therefore, it is not possible to develop self-sensing cement composites by incorporating GO directly without resolving its dispersion issue. However, GO agglomerates enhance the flexural strength of cement paste because of their special morphology and intrinsic strength. Results showed that the flexural strength of cement paste was increased by 83% with incorporation of 0.04% GO by weight of cement.
AB - Actual dispersion of graphene oxide (GO) in cement paste was investigated by using both X-ray computed tomography and X-ray photoelectron spectroscopy. It was found that GO nanosheets are mainly agglomerated, as an individual phase, with platelet-like morphology and little GO being absorbed onto surfaces of cement particles and hydration products. By performing an electrical resistivity test, GO agglomerates are found to be more electrically insulative than cement paste. Therefore, it is not possible to develop self-sensing cement composites by incorporating GO directly without resolving its dispersion issue. However, GO agglomerates enhance the flexural strength of cement paste because of their special morphology and intrinsic strength. Results showed that the flexural strength of cement paste was increased by 83% with incorporation of 0.04% GO by weight of cement.
KW - Cement
KW - Dispersion
KW - Electrical resistivity
KW - Graphene oxide
UR - http://www.scopus.com/inward/record.url?scp=85048710797&partnerID=8YFLogxK
U2 - 10.1016/j.cemconcomp.2018.06.008
DO - 10.1016/j.cemconcomp.2018.06.008
M3 - Article
AN - SCOPUS:85048710797
SN - 0958-9465
VL - 92
SP - 145
EP - 154
JO - Cement and Concrete Composites
JF - Cement and Concrete Composites
ER -