Abstract:

This paper deals with the evolution rules of the total strain energy,the dissipated strain energy and theelastic strain energy of CRTS I cement- emulsified asphalt mortar (CA mortar) at various strain rates.The resultsshow that (1) the higher the strain rate,the more accumulated elastic strain energy in the CA mortar and the higherthe peak stress; (2) a large amount of the elastic strain energy accumulates before the peak stress and is continu-ously released and then translated into the surface energy perforating the rupture surface; (3) with the increase ofthe strain rate,the reduced extent of the proportion of the elastic strain energy accounting for the total strain energy(W e /W) decreases,but the release amount and the rate of the elastic strain energy increase,the strength of CAmortar decays faster,and the brittleness becomes more obvious; (4) the dissipated strain energy constantly increaseswith the increase of strain,and is mainly produced in the way of propagation and dislocation friction of cracks; and(5) with the increase of the strain rate,more small cracks are produced in the CA mortar,and the propagation ofcracks is limited by the deformation rate,so that the proportion of the dissipated strain energy accounting for the to-tal strain energy (W d /W) becomes smaller.

Key words: cement- emulsified asphalt mortar, strain rate, peak stress, elastic strain energy, dissipated strainenergy