High tensile steel is required in prestressed concrete member and it is obtained by increasing carbon content in steel and percentage of carbon is 0.6-0.85%, 0.7-1% of manganese, 0.05% of sulphur and phosphorus is present in high tensile steel.

Indian standard code IS 1343-1980 and IS 456-1978 stipulates that only controlled concrete should be used for prestressed concrete construction and exact specifications with regard to acceptance criteria for concrete generally vary from one code to anor.

In British DOE method based on type of cement and coarse aggregate provided evaluate compressive strength of concrete mix made with water cement ratio of 0.5 and durability requirements of mix design. Doe is design of experiments is a methodology that can be effective for general problem solving as well as for improving or optimizing product design and manufacturing and production process.

The maximum tensile stress at initial tensioning time should not exceed 80 percent of ultimate tensile strength of wire and yield stress for steel and permissible unit bearing pressure on concrete should not exceed 0.48F_r (A₁/A₂)^1/2 after accounting for are all losses due to creep of concrete, elastic shortening, relaxation of steel and seating of anchorages etc.

The various methods adopted for designing high strength concrete mixes are Erntroy and Shack lock?s empirical method, American concrete institute method, British DOE method, Indian standard code and British code BS 8110-1985 stipulates that not more than 5 percent of test results should fall below 28 days characteristic strength.

As per IS: 6003-1983, diameter of wires are mostly used in strands of two, three or seven wires and y are considered as indented or crimped pretensioned element, due to ir superior bond character and two and three ply strands, 2-3mm diameter wires are used whereas in 7 ply stand a diameter of 2-5mm wires are adopted and nominal diameter of 7 ply stand varies in between 6.3 to 15.2mm.

American concrete institute?s mix design procedure for no slump is one of methods used for high strength concrete mix design and American concrete institute in a non profit technical society and standards developing organization, ACI was founded in January 1905.

Atomic hydrogen is liberated as a result of action of acids on high-tensile steel and y penetrate into steel surface making it brittle and fracture prone on being subjected to tensile stress and even small amounts of hydrogen can cause considerable damage to tensile strength of high steel wires.

The concrete in a prestressed concrete member is subjected to high bearing stresses due to anchoring at its ends and hence, high strength concrete is required to safely resist bursting stresses at end of beam.

According to BSEN (British code): 1993-1-2004, nominal cover is provided for steel to obtain most effective fire resistance and durability and it is ability of structural member to withstand effect of fire without reaching any of limit states.