ENGINEERING JOURNAL CHIANG MAI UNIVERSITY

Volume 25, No. 03, Month DECEMBER, Year 2018, Pages 113 - 121

Properties of cement composite fabricated from white rice husk ash incorporated with short single-walled carbon nanotubes

Suchart Chantaramanee, Wassana Keanthongdang, Phattaraparn I-suwan and Danupon Tonnayopas

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This paper reported physical and mechanical properties of cement composites blended from white rice husk ash (WRHA) and short single-walled carbon nanotubes (CNT). Twelve experiments of 10, 20 and 30 wt.% WRHA and type I Portland cement including 0, 0.05 and 0.20 wt.% CNT were carried out with no-water curing and 28 days water curing. The water to binder ratio (w/b) was 0.4 throughout the study. The performance of the cement composites was evaluated by conducting the following tests: bulk density, water absorption, volumetric drying shrinkage, resistivity, Shore hardness and compressive strength. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were also used to characterize specimens. The test results showed that the highest compressive strength belongs to 10 wt.% WRHA with 0.20 wt.% CNT of 36.45 MPa. XRD analysis showed pozzolanic phase of hatrurite while SEM technique displayed dispersion of CNT. The specimens with CNT provided higher bulk density with reduction of volumetric drying shrinkage following the increase of CNT content. Moreover, higher content of CNT resulted in higher water absorption and reduction of Shore hardness.

Keywords

Cement composites, Short single-walled carbon nanotubes, White rice husk ash, Resistivity, Shore hardness

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