Concrete mechanical behavior

Siham.Kamali-Bernard insa-rennes.fr, dkeinde85 yahoo.fr, Fabrice.Bernard insa-rennes.fr Keywords Concrete, mechanical behavior, interface, aggregate, matrix. 

The compressive strength results are given in Tables 3 and 4 below, for 7 and 28 days, respectively. The graphic representations of Tables 3 and 4 can be seen in Figures 2 and 3, which show the trend of the mechanical behavior of concrete containing both polymeric additives. 

In comparison to steel and steel reinforced concrete, a distinction of FRP composites is their usually ortho tropic mechanical behavior. The strongest direction is always in parallel to that of the fiber direction. Strength and stiffness of a FRP component depend on the orientation of the fibers and quantity of fibers oriented in each direction. Bundles of parallel fibers are called roving. Different textiles... 

Mechanical Behavior of High Performance Concretes. Vol. 1 Summary Report. Describes a literature search and review, the development of mixture... 

Nigro E, Cefarelli G, Bilotta A, Manfredi G and Cosenza E (2011), Fire resistance of concrete slabs reinforced with FRP bars. Part I Experimental investigations on the mechanical behavior . Composites Part B Engineering, 42(6), 1739-1750. 

Kabele, P. (2003) New development in analytical modeling of mechanical behavior of ECC , Journal of Advanced Concrete Technology, Japan Concrete Institute, 1(3) 253-64. 

The mechanical behavior of concrete should be viewed from the point of view of a composite material. A composite material is a three dimensional combination of at least two chemically and mechanically distinct materials with a definite interface separating the components. This multiphase material will have different properties from the original components. Concrete qualifies as such a multiphase material. Concrete is composed of hydrated cement paste (C-S-H, CH, aluminate, and ferrite-based compounds) and imhydrated cement, containing a network of a mixture of different materials. In dealing with cement paste behavior, basically it is considered that the paste consists of C-S-H and CH with a capillary system. The model of concrete is simplified by treating it as a matrix containing aggregate embedded in a matrix of cement paste. This model provides information on the mechanical properties of concrete. 

The factors that influence the mechanical behavior of concrete are shape of particles, size and distribution of particles, concentration, their orientation, topology, composition of the disperse and continuous phases, and that between the continuous and disperse phase and the pore structure. The important role played by cement paste is already described. 

S.Y.N. Chan, X. Luo and W. Sun, Mechanical behavior of fibre reinforced high performance concrete after exposure to high temperatures , in P. Rossi and G. Chanvillard (eds) Fibre Reinforced Concr es (FRC) BEFiB 2000, Proc. RILEM PR015, RiLEM Publications, Bagneux, 2000, pp. 521 529. 

N. Hisabe, I. Yoshitake, H. Tanaka and S. Hamada, Mechanical behavior of fiber reinforced concrete elements subjected to pure shearing stress , in International Workshop on High Perfromance Fiber Reinforced Cementitious Composites in Structural Applications, Honolulu, 2005, CD-ROM. 

In the next section we describe the most general approaches that are successfully employed at the theoretical study of the hydrogen behavior in compounds with hydrogen bonds. Then in the following sections we will show how some concrete problems are solved using methods developed in quantum mechanics, quantum field theory of solids, and statistical mechanics. 

The mechanical troweling apparatus for preparation of adhesion specimen of plastering material to concrete substrate can estimate satisfactorily the workability of PLCM with visco-elastic behavior. Workability of existing PLCM is not always sufficient to apply. It is necessary to improve the characteristics of PLCM. 

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