E - modulus of elasticity of a material; the stiffness of a material 

efflorescence - a white deposit on concrete or brick caused by crystallization of soluble salts brought to the surface by moisture in the masonry or concrete

elastic - capable of sustaining deformation without permanent loss of shape 

elastic deformation - non-permanent deformation; when the stress is removed, the material returns to its original shape 

elasticity - the property whereby a material changes its shape under the action of loads but recovers its original shape when the loads are removed 

elastomer - a natural or synthetic rubber-like material 

electrolyte -  a medium of air, soil, or liquid carrying ionic current between two metal surfaces, the anode and the cathode 

electrolytic cell - a device for producing electrolysis consisting of the electrolyte and the electrodes  

electrolytic corrosion - corrosion of a metal associated with the flow of electric current in an electrolyte 

elliptic arch - an arch in which the intrados surface is a full half of the surface of an elliptical cylinder; this terminology is sometimes incorrectly applied to a multicentered arch (an elliptic arch is fitted to stone masonry arches) 

elongation - the elastic or plastic extension of a member 

embankment - a bank of earth  constructed above the natural ground surface to carry a road or  to prevent water from passing beyond desirable limits; also known as bank 

end block - on a prestressed concrete beam, the increase in beam web width at the end to provide adequate anchorage bearing for the post tensioning steel and to resist high cracking stresses 

end post - the end compression member of a truss, either vertical or inclined in position and extending from top chord to bottom chord 

end section - a concrete or steel appurtenance attached to the end of a culvert for the purpose of hydraulic efficiency and anchorage 

end span - a span adjacent to an abutment 

epoxy - a synthetic resin which cures or hardens by chemical reaction between components which are mixed together shortly before use  

equilibrium - in statics, the condition in which the forces acting upon a body are such that no external effect (or movement) is produced 

equivalent uniform load - a load having a constant intensity per unit of its length producing an effect equal to that of a live load consisting of vehicle axle or wheel concentrations spaced at varying distances 

erosion - wearing away of soil by flowing water 

expansion - an increase in size or volume 

expansion bearing - a bearing designed to permit the longitudinal movements resulting from temperature changes and superimposed loads without transmitting a horizontal force to the substructure; see BEARING 

expansion dam - the part of an expansion joint serving as an end form for the placing of concrete at a joint; also applied to the expansion joint device itself 

expansion joint - a joint designed to provide means for expansion and contraction movements produced by temperature changes, loadings or other forces 

expansion rocker - a bearing device at the expansion end of a beam or truss that allows the longitudinal movements resulting from temperature changes and superimposed loads through a rocking motion   

expansion roller - a cylinder so mounted that by revolution it facilitates expansion, contraction or other movements resulting from temperature changes, loadings or other forces