Effect of GO nanosheets on shapes of cement hydration crystals and their formation process

Effect of graphene oxide on the mechanical properties and the formation of layered double hydroxides (LDHs) in alkali-activated slag cement

“…% was approximately 20% after 7 days. However, this is inconsistent with the optimal content of GO in the OPC system, which is approximately 0.03% -0.04%, as reported in previous studies [14,19,28]. Interestingly, the data of the compressive strengths of all the specimens with the addition of GO showed a slight decreasing tendency, except for GM-1 at 28 days, quite different from the trend for OPC [13-14, 18-19, 28].…”

“…Moreover, the unique rough surface of GO with many functional groups (-OH, -COOH and -O-) has a seeding effect on the hydration kinetics in cement. Lv et al [19] found that use of GO nanosheets could produce barlike and flower-like crystals in OPC that are the hydration products in the system and regarded as the reason for the improvement in mechanical properties. In addition, calcium-type cross-linking has been found in OPC due to the presence of the carboxyl and hydroxyl groups of GO [20], which can minimise 4 the pore size and form strong interfacial adhesion to the cement matrix.…”

Effect of graphene oxide on the rheological properties of cement pastes

“…Consequently, GO shows a better gain in compressive strength at a lower concentration when compared to CNT reinforced cement [12]. The introduction of GO in cement not only can regulate hydration but also improve the tensile, flexural and compressive strengths of the cement paste [8,[18][19][20][21][22]. Lv et al [19] discovered that when the content of GO was 0.03%, the cement composites exhibited remarkable increase in tensile strength (78.6%), flexural strength (60.7%) and compressive strength (38.9%).…”

Co-effects of graphene oxide sheets and single wall carbon nanotubes on mechanical properties of cement

“…Those impressive mechanical natures stimulated interesting research in applying graphene as a superlative filler in reinforced composites [24,25]. Graphene oxide (GO), which possesses a high specific surface area and ultrahigh strength [26], can easily form composites with polymer and ceramic materials with chemical bonds, affecting cement hydration crystal shape and increasing its flexural and compressive strength [27][28][29][30][31].…”