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This system could be also employed in constructing the vibration and impact absorber bearing
pieces and slabs, which can be used in "the Railroad & Subway Structures" too.
Here, the "RCS" and particularly, "ECRLC" as a type of RCS have been concisely presented.
[Meanwhile, in the related pictures & figures, an instance of the said new structure and its
components and the results of some performed experiments (as the "in-bending" & in-compressive
loadings of the slabs including this structure, similar to ASTM E 72 Standard) have been pointed.]
Key  Words:  Strength  of  materials  (solid  mechanics),  Civil  (construction),  Materials,  Earthquake  (resistance  and 
safety),  Resilient  concrete  (flexible  concrete,  bendable  concrete,  elastic  concrete),  Composite  concrete, 
Lightweight concrete, Reinforced concrete, Fibered concrete, Lightweight & integrated construction, Rail (railroad, 
railway), Subway, Road, Bridge, Resilience, Energy absorption, Fracture pattern, Non‐linear, Strain changes, Beam, 
Ductility,  Toughness,  Insulating  (insulation),  Thin,  Slab,  Roof,  Ceiling,  Wall  (partition),  Building,  Tower,  Plan  of 
mixture,  Insulating  reinforced  lightweight  pieces,  3d,  Sandwich  panel,  Dry  mix,  Plaster,  Foam,  Expanded 
polystyrene (EPS), Polypropylene, Pozzolan, Porous matrix (Pored matrix), Mesh (lattice), Cement, RCS, ECRLC  

I. Introduction
II. What are the Resilient Composite Systems?
B. General View
B. Components
1) Mesh or Lattice
2) Fibers or Strands
3) "Matrix" with the Suitable Hollow "Pores (Voids)" and/or "Lightweight Aggregates" in its

C. More Explanations about the RCS
D. Why are These Systems Called as "Composite"
E. The General Structural Particulars and Functional Criteria as the Necessary
Specifications of the Compound Materials Generally Called as "Resilient Composite
1) General Structural Criteria
2) Functional Criteria (Required Specifications)

III. "Elastic Composite Reinforced Lightweight Concrete (ECRLC)" as a type of the
Resilient Composite Systems (RCS)
An Instance of the Lightweight Concrete that Could be Used in Making the ECRLC

IV. Review of Some Experiments, and more description about ECRLC
V. Supplementary Elements
VI. Applications
VII. Final Review
It is clear that; there are several advantages in employing lightweight concretes. In spite of these
important advantages, there are numerous common and sometimes strategic problems and restrictions in
using the lightweight concretes (especially about the lightweight concretes with oven-dry densities of <
800kg/m3 as the insulating concretes). These problems are among them: the shape of stress-strain diagram
in the usual reinforced lightweight concretes and high possibility of brittle and non-secure being of
fracture pattern; low mechanical strengths as the compressive, bending, tensile, and shearing strengths
(e.g., punch shear); low ratios of "the dynamic and static elasticity modulus and shearing and tensile