TY - JOUR
T1 - Evaluation of microstructure and mechanical performance of CNT-reinforced cementitious composites at elevated temperatures
AU - Zhang, L. W.
AU - Kai, M. F.
AU - Liew, K. M.
N1 - Funding Information:
The work described in this paper was fully supported by grants from the National Natural Science Foundation of China (Grant Nos. 51378448 and 11402142) and the Research Grants Council of the Hong Kong Special Administrative Region, China (Project No. 9042047, CityU 11208914).
Publisher Copyright:
© 2017 Elsevier Ltd
PY - 2017/4/1
Y1 - 2017/4/1
N2 - Experimental studies are carried out to examine the microstructure and mechanical performance of carbon nanotube (CNT) reinforced cementitious composites at elevated temperatures (25 °C, 200 °C, 400 °C and 600 °C). Two different contents (0.1% and 0.2% by weight of cement) of CNT are added to cement paste. X-ray powder diffraction (XRD) results show that CNT does not improve or impede the hydration of cement minerals at room temperature, while at higher temperatures the further hydration process caused by high-pressure steam is impeded by CNT. The morphology observed by scanning electron microscopy (SEM) indicates that the bridging effect of CNT can be maintained below 400 °C, while CNT is mostly spalled with the matrix on the walls of pores and gaps at 600 °C. The residual flexural and compressive strength are measured. The reinforcing effect of CNT is most obvious at 400 °C, which is due to the potential of CNT as channels for releasing high-pressure steam.
AB - Experimental studies are carried out to examine the microstructure and mechanical performance of carbon nanotube (CNT) reinforced cementitious composites at elevated temperatures (25 °C, 200 °C, 400 °C and 600 °C). Two different contents (0.1% and 0.2% by weight of cement) of CNT are added to cement paste. X-ray powder diffraction (XRD) results show that CNT does not improve or impede the hydration of cement minerals at room temperature, while at higher temperatures the further hydration process caused by high-pressure steam is impeded by CNT. The morphology observed by scanning electron microscopy (SEM) indicates that the bridging effect of CNT can be maintained below 400 °C, while CNT is mostly spalled with the matrix on the walls of pores and gaps at 600 °C. The residual flexural and compressive strength are measured. The reinforcing effect of CNT is most obvious at 400 °C, which is due to the potential of CNT as channels for releasing high-pressure steam.
KW - CNT-reinforced cementitious composites
KW - Elevated temperatures
KW - Experimental studies
KW - Microstructure
KW - Thermo-mechanical performance
UR - http://www.scopus.com/inward/record.url?scp=85012866795&partnerID=8YFLogxK
U2 - 10.1016/j.compositesa.2017.02.001
DO - 10.1016/j.compositesa.2017.02.001
M3 - Journal article
AN - SCOPUS:85012866795
SN - 1359-835X
VL - 95
SP - 286
EP - 293
JO - Composites - Part A: Applied Science and Manufacturing
JF - Composites - Part A: Applied Science and Manufacturing
ER -