Mechanical Properties of Concrete Mixed with SiO₂ and CaCO₃ Nanoparticles

Abstract:

The split tensile strength and compressive strength of concrete mixed with SiO₂ and CaCO₃ nanoparticles have been experimentally studied. SiO₂ nanoparticles as a partial cement replaced by 0.5, 1.0, 2.0 and 3.0 wt.% and CaCO₃ nanoparticles by 1.0 and 3.0 wt.% were added partially to concrete. Curing of the specimens has been carried out for 7, 28, 78 and 128 days after casting. SiO₂ nanoparticle as a partial replacement of cement up to 3.0 wt.% could accelerate formation of CSH gel at the early ages and hence increase the split tensile strength and compressive strength. The optimal replacement level of cement by SiO₂ nanoparticles for producing concrete with improved strength was set at 2.0 wt.%. CaCO₃ nanoparticles as a partial replacement of cement up to 3.0 wt.% could consume crystalline Ca(OH)₂ and accelerate formation of calcium carboaluminate hydrate at the early ages and increase the split tensile strength and compressive strength. The optimal replacement level of cement by CaCO₃ nanoparticles for producing concrete with improved strength was set at 3.0 wt.%.

• Periodical: Applied Mechanics and Materials (Volumes 71-78)
• Pages: 1233-1236
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.71-78.1233
• Online since: July 2011
• Authors: De Zhi Wang, Yun Fang Meng, Yin Yan Zhang
• Keywords: Caco3 Nanoparticles, Compressive Strength, SiO₂ Nanoparticle, Split Tensile Strength

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