Improvement of performance of ultra-high performance concrete based composite material added with nano materials

Improvement of performance of ultra-high performance concrete based composite material added with nano materials

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Ultra-high performance concrete (UHPC), a kind of composite material characterized by ultra high strength, high toughness and high durability.It has a wide application prospect in engineering practice.But there are some defects in concrete.How to improve strength and toughness of UHPC remains to be the target of Canes/Cane Accessories researchers.

To obtain UHPC with better performance, this study introduced nano-SiO2 and nano-CaCO3 into UHPC.Moreover, hydration heat analysis, X-Ray Diffraction (XRD), mercury intrusion porosimetry (MIP) and nanoindentation tests were used to explore hydration process and microstructure.Double-doped nanomaterials can further enhance various mechanical performances of materials.Nano-SiO2 can promote early progress of cement hydration due to its high reaction activity and C-S-H gel generates when it reacts with cement hydration product Ca(OH)2.

Nano-CaCO3 mainly plays the role of crystal nucleus effect and filling effect.Under the combined action of the two, the composite structure is denser, which provides a way to improve DJ Systems the performance of UHPC in practical engineering.