Resilient modulus variation

Figure 5. Variation of resilient modulus with temperature, soaking, and freeze-thaw cycling for a sulfur-modified asphaltic concrete and a concrete in which the asphalt is unmodified (46)...

Figure I. Variation of resilient modulus with sulfur and asphalt content...

The subgrade material is characterised by the elastic or resilient modulus, Mr, determined by AASHTO T 307 (2007) (also see Section 1.9.1). This property changes with seasonal variation of moisture content. The seasonal resilient moduli must be determined and from that an effective subgrade resilient modulus must be established. 

The allowable dimensional variation (the tolerance) of a polymer part can be larger than one made of metal - and specifying moulds with needlessly high tolerance raises costs greatly. This latitude is possible because of the low modulus the resilience of the components allows elastic deflections to accommodate misfitting parts. And the thermal expansion of polymers is almost ten times greater than metals there is no point in specifying dimensions to a tolerance which exceeds the thermal strains. 

Tougher and more resilient elastomeric materials were obtained after vulcanization (hot-press) of the elastomer with dicumyl peroxide, which was previously incorporated by calendering. In this case, semi-interpenetrating networks (semi-lPNs) were obtained by swelling the vulcanized rubber with a tetrahydrofiiran solution of FeCla, followed by exposure to pyrrole vapors [113]. A significant variation was observed when comparing the modulus, tenacity, and composi-... 

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