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shrinkage of concrete in prestressed members the shrinkage of concrete in prestressed members results in a shortening of ensioned wires and hence
loss of prestress due to shrinkage of concrete we know that concrete shrinks in volume when it dries up this volume reduction takes place in the form
calculation of deformationfor calculation of deformation at some stage before the total creep is reached it may be assumed that about half the
define the term- erection stresses the creep loss due to live load stress erection stresses and other stresses of short duration may be ignored the
determine the term - lowering of stressesdue to creep of concrete these compressive strains keep on increasing with time it means that the length
method to calculate the loss of prestress when the consider creep in regard to loss of prestress we have to see that the prestressed member is under
loss of prestress due to creep of concretecreep of concrete means time dependent deformation of concrete its effect depends upon the interval of
discuss about the post-tensioning systemsin most of post-tensioning systems when the cable is tensioned and the jack is released to transfer
how can we reduced frictional lossesfrictional losses can be reduced by several methods such as a over-tensioning the tendons by an amount equal to
state the effect of friction for a straight tendonthe length effect represents the effect of friction for a straight tendon due to slight
state the term- friction in tendonconsiderable frictional loss takes place due to friction between the tendon and the material surrounding it namely
determine the loss in post-tensioned membersthis loss occurs only in post-tensioned members there always exists a certain amount of friction in the
state the loss of prestressloss of prestress due to elastic shortening definitely occurs in pre-tensioned concrete members but in post-tensioned
loss of prestress due to elastic shortening at the transfer of prestress tensile stresses of tendons are transferred to concretc in the form of
determine about the prestressed concretein prestressed concrete the most important parameter is the prestressing force ifthe prestressing force
use of admixtures in concretethe use of chemical admixtures may be made in prestressed concrete construction but the admixture should not contain
what is the design mix concretedetermination of the proportions of cement aggregates and water to achieve the required strengths in
concrete mix proportionsconcrete mix proportions should be chosen in such a way that concrete of adequate workability is obtained workability of
modulus of elasticity of light-weight concrete the modulus of elasticity of light-weight concrete is about 50 to 55 of that of normal-weight concrete
light-weight aggregate prestressed concretethe use of light-weight aggregate concrete for prestressed concrete construction is well established
state the moulds in prestressed concretemoulds for pre-tension work should be sufficiently strong and rigid so that they can withstand the effects of
define the meaning of grout - concretegrout should be made with any type of recommended cement and using water of a required quality if very large
strength of concrete at the transfer stage concrete strength in the member at the transfer stage should conform to the design requirements the
state the modulus of elasticity of concrete the youngs modulus of elasticity of concrete is primarily influenced by the elastic properties of the
determine the term- shrinkage of concreteshrinkage of concrete is primarily due to gradual loss of moisture which results in change in volume the