Research On Mechanical Properties And Durability Of Nano Concrete

As the most promising material in twenty-first Century, nano materials have been widely concerned by the society. As the largest amount of traditional building materials,concrete has been used for more than one hundred years. The durability of concrete has been the primary problem of concrete research work.By adding nano materials to concrete, it has opened a new way for the research of modified concrete.Based on the mix proportion of primary concrete, determine the mix proportion of nano-concrete, according to the characteristics of nano materials that nano materials will be reunited after water absorption,Study on the mixing process of nano concrete in order to obtain a good dispersion of nano materials,make full use of its function.The effects of the mechanical properties and durability of CaCO3 nano-concrete and Si O2 nano-concrete were investigated by compressive, flexural strength, dry shrinkage test, anti carbonation test, chloride ion penetration test and freeze-thaw test.The experimental results show that the nano materials can be used as the material of the external modification of concrete, which can improve the mechanical properties and durability of concrete, because of the small size and large specific surface area.Through micro research techniques by SEM and XRD,nano material is beneficial to optimize the internal porosity and micro cracks of concrete,reinforc compactness of concrete,in addition, nano SiO2 can reduce the formation of Ca(OH) 2 and reduce the orientation of the concrete,improving the strength of the transition zone between the cement base material and the aggregate.The mechanical properties and durability of nano concrete were compared. The change law of concrete mechanical properties with different nano materials volume were studied. The mechanism of nano materials for concrete was explored by SEM and XRD analysis.