Abstract
Nanomaterial, as a new emerging material in the field of civil engineering, has been widely utilized to enhance the mechanical properties of cementitious material. Nano-SnO2 has presented high hardness characteristics, but there is little study of the application of nano-SnO2 in the cementitious materials. This study mainly investigated the hydration characteristics and strength development of Portland cement paste incorporating nano-SnO2 powders with 0%, 0.08%, and 0.20% dosage. It was found that the early-age compressive strength of cement paste could be greatly improved when nano-SnO2 was incorporated with 0.08% dosage. The hydration process and microstructure were then measured by hydraulic test machine, calorimeter, nanoindentation, X-ray diffraction, scanning electron microscope, and mercury intrusion porosimetry. It was found that the cement hydration process was promoted by the addition of nano-SnO2, and the total amount of heat released from cement hydration is also increased. In addition, the addition of nano-SnO2 can promote the generations of high density C-S-H and reduce the generations of low density C-S-H indicating the nucleation effect of nano-SnO2 in the crystal growth process. The porosity and probable pore diameter of cement paste with 0.08% nano-SnO2 were decreased, and the scanning electron microscopic results also show that the cement paste with 0.08% nano-SnO2 promotes the densification of cement microstructure, which are consistent with the strength performance.
Highlights
Cement-based material, as one of the common and widely used building materials in the world, is a nanostructured, multi-phase, composite material with goingon hydration.[1]
With the dosage of nano-SnO2 increased to 0.20%, the shear stress of the cement paste was increased about 8% compared to the reference sample, indicating that the cement paste becomes a little viscous with the increase of nano-SnO2 content
The modification effect of nano-SnO2 on cement can be expressed through its influence on the macroscopic mechanical properties
Summary
Cement-based material, as one of the common and widely used building materials in the world, is a nanostructured, multi-phase, composite material with goingon hydration.[1]. The compressive strength of cement pastes with 0.08% nano-SnO2 dosage was increased by 41.1%, 4.4%, and 10.6% at 1, 3, and 7 days, respectively.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
