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define the concept of creep of concretecreep of concrete is another important characteristic it represents progressive strains in concrete which
durability requirements for concreteeven though the alkaline environment of concrete protects steel carbonation of hydrated cement may decrease the
determine about the hard-drawn steel wireshard-drawn steel wires which are indented or crimped are preferred for pre-tensioned members as their bond
state about the prestressing steel for prestressed concrete members the high-tensile steel used generally consists of wires bars or strands the high
permissible stresses in steel as per the indian code the permissible stresses in the tendons at the time of initial prestressing should not exceed 80
determine the types of untensioned reinforcement reinforcement used as untensioned steel should be one of the following types a mild steel and
explain the term - untensioned reinforcementin prestressed concrete construction use of untensioned reinforcement also has to be made alongwith
explain about the hydrogen embrittlement as a result of the action of acids on high-tensile steels liberation of hydrogen takes place it penetrates
what is stress corrosion stress corrosion takes place in prestressed concrete tendons due to the combined actions of corrosion and static tensile
state the term - relaxation of stress in steel if we keep a high-tensile steel wire stretched and maintained at a constant strain the value of the
tensile stressesit has been possible to introduce tensile stresses of upto 850 nmm2 in tendons with the use of this method but the method is not
chemical prestressing in prestressed concrete normally tendons are stretched and are retained in a stretched condition by concrete consequently
state the procedure of prestressingwhen these wires cool down concrete is poured in the moulds in which these tendons are provided in a stretched
what is thermo-electric prestressing we know that stretched tendons are used in prestressed concrete stretching of tendons may be accomplished by
determine the example of tendon splicesfollowing are some examples of tendon splicesa torpedo spliceb clamp splicec screw
tendon splices tendon splices are used to join tendons when continuous prestressed concrete members require long tendons to achieve continuity
advantages of unbonded post-tensioning systemssimilarly some advantages of unbonded post-tensioning systems over bonded post-tensioning ones may be
advantages of bonded post-tensioning systems some advantages of bonded post-tensioning systems over unbonded post-tensioning ones are the following a
what are the long spam bridge girdersthe pre-tensioned construction finds more use and application in the construction of those structural concrete
explain term - losses of prestresswe know that with time tendons lose some of their initial prestress at the time of transfer of prestress this is
similarity between post and pre tensioned concretein the case of pre-tensioned concrete members a pattern of small length and small width
describe the behaviour of pre and post-tensioned membersthe behaviour of pre and post-tensioned members under imposed loads may be different
differentiate between concrete and tendonsin the case of pre-tensioned concrete members the transfer of prestress takes place due to the bond between
determine about the post-tensioned concretethe transfer stage may take place after a long time from the casting of concrete in the case of
define the pre-tensioned concrete constructionwe understand that in the pre-tensioned concrete construction stretched tendons are provided in the