Journal Published Online: 21 February 2019
Volume 47, Issue 5

Evaluation of Stabilized Graphite Nanoplatelets: Dispersion Quality and Mechanical Properties of Cement Composites

CODEN: JTEVAB

Abstract

This study investigates the effect of adding a small concentration (0–0.5 wt. % addition by mass of cement) of graphite nanoplatelets (GNP) to cementitious materials. GNP-water-surfactant suspensions with various surfactant concentrations (0–20 mg/mL) and sonication times (0.5–6 h) are prepared and subjected to different protocols (long-term standing and centrifugation). Then, dispersion and stability are qualitatively observed through digital imaging and scanning electron microscopy after long-term standing and quantitatively evaluated by calculating the absorbance spectra ratio. Furthermore, the mechanical properties of GNP-reinforced cement (GNPRC) are investigated. The results show that 8 mg/mL and 4.5 h are the best choices for the surfactant concentration and sonication time, respectively. Also, obvious reinforcement for the mechanical properties of GNPRC is found; specifically, the 0.05 wt. % addition of GNP increases the compressive strength by 7.5 % and 16.7 % after 7 days and 28 days curing, respectively. Then, between the GNP dosages of 0 and 0.5 wt. %, the flexural strengths at 7 days and 28 days continuously increase, up to 55.6 % and 53.3 %, respectively.

Author Information

Qin, Xiantao
School of Civil Engineering and Architecture, Wuhan Polytechnic University, Wuhan, People’s Republic of China
Zhu, Siyue
School of Civil Engineering and Architecture, Wuhan Polytechnic University, Wuhan, People’s Republic of China
Zhang, Rongtang
School of Civil Engineering and Architecture, Wuhan Polytechnic University, Wuhan, People’s Republic of China
He, Xiang
School of Civil Engineering and Architecture, Wuhan Polytechnic University, Wuhan, People’s Republic of China
Jiang, Yi
School of Civil Engineering and Architecture, Wuhan Polytechnic University, Wuhan, People’s Republic of China School of Construction Management Technology, Purdue University, West Lafayette, IN, USA
Pages: 10
Price: $25.00
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Stock #: JTE20180482
ISSN: 0090-3973
DOI: 10.1520/JTE20180482