Retard-bonded prestressed concrete has been in use for twenty years and is a new and distinctive prestressed system. Mechanical and service property
Experimental research and theoretical analysis of three retard-bonded partially prestressed concrete T-beams have to be carried out under static loadings. The law of crack development and distribution both with the relationship between load and maximum crack width have to be studied.
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According to concrete construction technologies, post prestressed concrete is divided into two prestressed systems, including un-bonded prestressed concrete and bonded prestressed concrete. Retard-bonded post prestressed concrete absorbs the strong points of both un-bonded and bonded in traditional post prestressed concrete while overcoming the weak points. The unbonded prestressed system when retard-bonded prestressed concrete is constructed, and after construction, retarding material that is wrapped in tendons start to coagulate and harden slowly, reaching the same effect with the bonded prestressed system.
The controlling crack width plays an important role in the design of the prestressed concrete members which is usually used under service load with multiple-crack. Because if the cracks width are greater than the allowable values in the specifications, it will bring serious security problems to partially prestressed concrete members, especially in the readily corrosive and hostile environment.
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The first application of external loads occurs in the analysis with the application of the cracking load. It is assumed that the member first cracks at the maximum moment section when the tensile capacity of concrete is exceeded. When the load is increased, the first cracks generally occurs in the pure bending interval of experimental specimens. But the crack width will be small.
Cracking moments of these beam specimens are related to effective prestress, that is larger effective prestress, the larger cracking moments, otherwise, the smaller cracking moments. The crack closing moments are generally related to the development of crack width, the bending moment at which the pre-compressive stress vanishes at the extreme fiber of the critical section, exposure effect of fracture face and the load-keeping time.
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