Manufacture of armatureless reinforced concrete by using of carbon nanotubes composite and silica nanoparticles

The aim of this research is made of a concrete that has been reinforced by carbon nanotubes (CNT) and silica nanoparticles. The experimental method, CNT and silica nanoparticles were prepared through CVD and Sol-gel methods, respectively. Obtained results from analysis of XRD are indicative of creating CNT/nanoSiO2 composite. Then, a composite was made in different percent and at time of manufacturing of concrete was added to mortar. After manufacturing of related concrete were performed compressive and tensile strength tests during 3, 7, 14, 28 and 36 days. Obtained results from compressive strength test by using of BS method show 320, 460, 640, 910 and 1400 MPa respectively that are 4 times more than compressive strength of normal concrete, this result has obtained through America concrete institute (ACI). Also obtained results from tensile strength test show rate of 730 MPa that is 4.5 times more than normal concrete. For gathering of information about dispersion and size of Silica nanoparticles and CNT in concrete, above cases were analyzed by SEM, this analysis shows that CNT/nanoSiO2 similar a network have coated throughout concrete grain-stones evenly. Sizes of Silica nanoparticles are about 12-25 nm and also diameter and length of CNT are about 5 nm and 20 μm respectively. Foregoing prefabricated concrete is used in building industries, dam construction, bridge construction and entire resistant structures against earthquake.

Keywords:

Concrete , Carbon nanotubes (CNT) , Silica , Nanoparticles , Nanocomposite , Compressive strength , Tensile strength , Chemical Vapor Deposition (CVD)