Research Article
Effect of Carbon Nanotube Size on Compressive Strengths of Nanotube Reinforced Cementitious Composites
Table 2
Properties and composition of surface treated MWNTs.
| | Types of MWNT and properties | M2 | M3 | M4 | M5 |
| | Outside diameter (nm) | 20–30 | 10–20 | <8 | 8–15 | | Length (μm) | 10–30 | 10–30 | 10–30 | 10–30 | | Purity (wt%) | >95 | >95 | >95 | >95 | | Ash (wt%) | <1.5 | <1.5 | <1.5 | <1.5 | | Specific surface area, SSA (m2/g) | >110 | >233 | >500 | >233 | | Electrical conductivity, EC (s/cm) | >10−2 | >10−2 | >10−2 | >10−2 | | COOH content (wt%) | 1.23 | 2.00 | 3.86 | 2.56 |
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