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D- deformed ribbed bar, R- round / plain bar, I- deformed indented bar Ductility Class. L- low ductility, N- normal ductility, E- seismic (Earthquake) ductility Standard grades (MPa) 250N, 300E, 500L, 500N, 500E Examples: D500N12 is deformed bar, 500 MPa strength, normal ductility and 12 mm nominal diameter – also known as "N12"
A Johnson bar (also Johnson corrugated bar) is a type of corrugated high-carbon steel [1] rebar used to reinforce concrete. The Johnson bar was invented by A.L. Johnson [ 2 ] of the St. Louis Expanded Metal Company.
Plastic spacers and bar supports do not bond well with concrete and are not compatible materials. [1] Plastic has mechanical properties (holds the bar in position) but no structural properties, and is a foreign element within the construction. When the concrete is poured into the form, a small gap is created between the concrete and the plastic.
They were spending ₹12 crores per annum before, buying oxygen from other manufacturers. Now the plant is supplying oxygen to COVID-19 treatment centers and hospitals in Kerala and other neighboring states also. As of April 2021, it has supplied over 1,100 tonnes of liquid oxygen to various agencies. [12] [13]
The use of cold-formed steel members in building construction began in the 1850s in both the United States and Great Britain. In the 1920s and 1930s, acceptance of cold-formed steel as a construction material was still limited because there was no adequate design standard and limited information on material use in building codes.
Sex ratio is 956 females per 1000 males. Kalamassery has an average literacy rate of 84%, which is significantly higher than the national average of 59.5%. Male literacy is 87%, and female literacy is 82%. In Kalamassery, 10% of the population is under 6 years of age. Hinduism is the most professed religion at 41%, followed by Islam (34%).
A dowel bar retrofit (DBR) is a method of reinforcing cracks in highway pavement by inserting steel dowel bars in slots cut across the cracks. It is a technique which several U.S. states' departments of transportation have successfully used in repairs to address faulting in older jointed plain concrete pavements.
Kozhikode (pronounced [koːɻikːoːɖɨ̆] ⓘ), also known as Calicut, is a city along the Malabar Coast in the state of Kerala in India. Known as the City of Spices, [1] Kozhikode is listed among the UNESCO's Cities of Literature.