ADVANCED TESTS FOR DURABILITY OF CONCRETE WITH NANOSILICA AND PEG400
Chandra Sekhar Malla1, Mukunda Rao D2
1Research Scholar, Department of Civil Engineering, Gitam Institute of Technology, Gitam University, Visakhapatnam, India
2Associate Professor, Department of Civil Engineering, Gitam Institute of Technology, Gitam University, Visakhapatnam, India
Due to the excellent properties of nanomaterials, it has a wide range of applications in different fields. One among them is their utilization in the manufacturing process of concrete. Even though nanomaterials are of high cost but a small replacement of their substitutes creates a high impact on the durability properties of concrete mixes. Nano silica is considered in the present study with curing compound PEG 400. In this work strength studies are conducted on M35 and M40 Grade concrete with Nano Silica by comparing them with PEG400 and without PEG400. Nano silica is utilized as a fractional substitution to Ordinary Portland binder by 1.5% of the total binder weight. In the present work, the partial replacement of Nano silica to cement showed a good influence in increasing strength properties. An optimal of 1 and 1.5 percent of addition of PEG400 is considered for M35 and m40 mixes. Durability studies such as water absorption test, permeability test on concrete, sorptivity test, acid attack on concrete cubes, bulk density, void ratio, and rapid chloride ions penetration test on concrete samples were also conducted on these mixes. Weight loss of specimens along with compressive strengths are observed when induced in 0.3,1 and 3 percent of sulphuric acid. High density and lower water absorption are observed in M40 concrete with 1.5 percent PEG400. Mixes with the addition of PEG400 have a high void ratio, are highly permeable, less resistant to acid attack.
Keywords: PEG 400, Nano silica, Weight loss, RCPT, Void Ratio, Coefficient of Permeability.