TY - JOUR
T1 - Effect of mixing duration on flexural strength of multi walled carbon nanotubes cementitious composites
AU - Mohsen, Mohamed O.
AU - Al-Nuaimi, Nasser
AU - Abu Al-Rub, Rashid K.
AU - Senouci, Ahmed
AU - Bani-Hani, Khaldoon A.
N1 - Funding Information:
This work was made possible by a National Priority Research Program award [NPRP 4-1142-2-440] from the Qatar National Research Fund (a member of Qatar Foundation). The statements made herein are solely the responsibility of the author[s].
Publisher Copyright:
© 2016 Elsevier Ltd
PY - 2016/11/15
Y1 - 2016/11/15
N2 - This paper investigates the effect of mixing duration on the flexural strength of multi-walled carbon nanotubes (MWCNTs) reinforced cementitious composites. Each batch containing 0.03%, 0.08%, 0.15% or 0.25% MWCNT to cement weight fractions was prepared using mixing durations of 1.5, 15, 30, and 60 min. On the 28th day, the flexural strengths of the specimens prepared from the batches, were obtained using three-point bending tests. The specimen microstructures were investigated using scanning electron microscope (SEM) and image analysis techniques. The purpose of the investigation was to identify potential relationships between strength, dispersion, void ratio, and mixing duration. The results showed that increasing the mixing duration improved the dispersion and strength of most MWCNT reinforced cementitious batches. They also showed a high flexural strength increase for MWCNT reinforced cementitious batches containing a 0.25% CNT to cement weight fraction and mixed for 60 min. Moreover, the results showed that increasing the mixing duration resulted in a reduction of the percent void ratio of MWCNT reinforced cementitious batches. These findings are significant for a wide variety of concrete applications where higher flexural strength and small void are needed.
AB - This paper investigates the effect of mixing duration on the flexural strength of multi-walled carbon nanotubes (MWCNTs) reinforced cementitious composites. Each batch containing 0.03%, 0.08%, 0.15% or 0.25% MWCNT to cement weight fractions was prepared using mixing durations of 1.5, 15, 30, and 60 min. On the 28th day, the flexural strengths of the specimens prepared from the batches, were obtained using three-point bending tests. The specimen microstructures were investigated using scanning electron microscope (SEM) and image analysis techniques. The purpose of the investigation was to identify potential relationships between strength, dispersion, void ratio, and mixing duration. The results showed that increasing the mixing duration improved the dispersion and strength of most MWCNT reinforced cementitious batches. They also showed a high flexural strength increase for MWCNT reinforced cementitious batches containing a 0.25% CNT to cement weight fraction and mixed for 60 min. Moreover, the results showed that increasing the mixing duration resulted in a reduction of the percent void ratio of MWCNT reinforced cementitious batches. These findings are significant for a wide variety of concrete applications where higher flexural strength and small void are needed.
KW - Carbon nanotubes dispersion
KW - Cement mixing duration
KW - Flexural strength
KW - Nanocompostite cement
KW - Porosity effect
UR - http://www.scopus.com/inward/record.url?scp=84988822540&partnerID=8YFLogxK
U2 - 10.1016/j.conbuildmat.2016.09.073
DO - 10.1016/j.conbuildmat.2016.09.073
M3 - Article
AN - SCOPUS:84988822540
SN - 0950-0618
VL - 126
SP - 586
EP - 598
JO - Construction and Building Materials
JF - Construction and Building Materials
ER -