Effect of Nano-CaCO₃ on Compressive Strength Development of High Volume Fly Ash Mortars and Concretes

Abstract

This paper presents the experimental results on the effect of nano-CaCO 3 on compressive strength development of mortars and concretes containing high volume fly ash (HVFA). The effect of various nano-CaCO 3 contents such as 1, 2, 3 and 4% (wt.%) as partial replacement of cement on the compressive strength of mortars are evaluated in the first part. The nano-CaCO 3 content which exhibited the highest compressive strength above is used in high volume fly ash mortars and concretes containing 40% and 60% class F fly ash. The results show that among four different nano-CaCO 3 contents, the addition of 1% nano-CaCO 3 increased the compressive strength of mortars and concretes. The addition of 1% nano-CaCO 3 also increases the early age and 28 days compressive strengths of HVFA mortars and concretes. The X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM) analysis results also support the above findings.

Recycling CO2 from flue gas for CaCO3 nanoparticles production as cement filler: A Life Cycle Assessment

“…obtained the best performance by employing 1% of nano-CaCO 3 in cement paste but found that by increasing the CaCO 3 content there was only an improvement in the hydration. Supit et al (2014) also obtained better results for 1% of CaCO 3 in mortars and concretes; similarly, Cosentino et al (2019) had better results by employing 2% of CaCO 3 in mortar cement.…”

“…Some studies have shown that micro-CaCO 3 has a slight acceleration effect on the hydration rate [8,10,11]. Moreover, the performance of the effect on flexural and compressive strength of the hardened cement paste was even better when nano-CaCO 3 particles were employed [8,[10][11][12][13][14]. The performance depends also on the CaCO 3 content.…”

3D Printing Cementitious Materials Containing Nano-CaCO3: Workability, Strength, and Microstructure

“…Therefore, a greater addition of NC caused a lower fluidity of 3DPC. The change in trend may be attributed to the highly specific surface area of NC (Supit and Shaikh, 2014;Yang and Che, 2019), which would generally increase the viscosity and the yield stress of mixtures. Furthermore, due to the accelerating effects of NC on cement, additional hydration products, such as C-S-H and CH, increase the formation of the flocculation structure of cement pastes (Roussel et al, 2012).…”

Properties of Cement-Based Composites Modified with Magnetite Nanoparticles: A Review

“…Compared to nano-Fe 3 O 4 powder and bulk Fe 3 O 4 powder, the nano-Fe 3 O 4 magnetic fluid significantly lowered the RL and broadened the absorption bandwidths due to its nanoscale particle size as well as its better dispersion in the cement paste. When the size of Fe 3 O 4 is in the nanoscale range, its electronic polarization, ion polarization, and dipole polarization are enhanced [21].…”

“…These nanomaterials, together with silver nanoparticles, carbon nanotubes, and nanofibers, are most often used for the production of the commercially available building products containing nano-objects. Only a few nanomaterials have been investigated as additions or admixtures to cement concretes and mortars; these include titanium dioxide, aluminum nano oxide, zinc oxide, nano-CaCO 3 , and silicon dioxide [18,19,20,21,22,23]. Most of the research dealing with the modification of cement-based composites concerns titanium dioxide and silicon dioxide, commonly called nanosilica.…”