Mechanical and durability properties of high volume fly ash (HVFA) concrete containing calcium carbonate (CaCO3) nanoparticles

Effects of nano-silica and nano-limestone on flowability and mechanical properties of ultra-high-performance concrete matrix

“…Therefore, greater cement replacement amounts achieve lower flowability. This phenomenon is due to the fine particle sizes of the nano-materials, which have much higher surface areas that absorb water, leaving less free water to contribute to the flowability [14,32]. Table 4 shows the strengths of the UHPC matrix under standard curing (7 days and 28 days) and combined curing (first 2 days heat and then 26 days standard curing) increase by incorporating NS for both W/B ratios of 0.16 and 0.17.…”

Influences of nano-TiO2 on the properties of cement-based materials: Hydration and drying shrinkage

“…The commonly used nano-particles in cement and concrete were nano-SiO 2 [4][5][6][7][8][9], nano-Al 2 O 3 [10][11][12], nano-TiO 2 [13][14][15], nanoCaCO 3 [16][17][18][19], etc. Hou et al studied the effect of nano-SiO 2 on cement hydration and revealed that the early age hydration was significantly increased [20,21].…”

Experimental study on segregation resistance of nanoSiO2 fly ash lightweight aggregate concrete

“…Behfarnia and Salemi have studied the effects of nanoSiO 2 and nanoAl 2 O 3 on frost resistance of normal concrete, experimental results show that the frost resistance of concrete containing nano-particles are considerably improved, and it is also concluded that the frost resistance of concrete containing nanoAl 2 O 3 was better than that containing the same amount of nanoSiO 2 [15]. Shaikh and Supit have researched the mechanical and durability properties of high volume fly ash concrete containing nanoCaCO 3 , and results reveal that the addition of nanoCaCO 3 not only leads to much denser microstructure in HVFA matrix but also changes the formation of hydration products, hence contributes to the improvement of early-age compressive strength and durability properties of HVFA concretes [16]. However, the study about effect of nano-material and fly ash on segregation resistance of LWAC is still not seen.…”