Effects of strain rate and confining pressure on compressive behavior of cement asphalt mortar

Experimental Investigation of Stochastic Mechanical Behavior of Cement Emulsified Asphalt Mortar under Monotonic Compression

“…Furthermore, by considering the lack of capability for characterizing the stochastic behaviors (variance), the applicability of the proposed model is wider, to some extent, compared with the presented model mentioned in this work. In summary, by examining the comparison results between the predictions and the experimental results in this work, it is verified that the proposed model is able to characterize the stochastic constitutive relationship (nonlinear and random stress-strain behaviors) of CA mortar under uniaxial monotonic compression with clear physical meaning based on a statistical damage approach, while some researchers used empirical relationships to predict certain mechanical behaviors of materials [11,22,24,25,48,59,60].…”

“…In view of CA mortar normally being under the coupling effect of varied loading frequencies and temperatures during the service condition, the mechanical properties have been usually examined incorporated with strain rate effects and temperature sensitivity. Such approaches have been applied successfully to deal with relative topics, and a variety of works can be traced [8,21,[23][24][25][26][28][29][30][31][32][33]45]. In detail, several conclusions are can be drawn according to those researches: (1) the compressive strength, compressive strain, and the elastic modulus are much more sensitive than traditional Portland cement mortar and concrete to strain rate effect [28]; (2) the peak strength, discrete dynamic Young's modulus, and specific energy absorption increase with strain rate [8,21,23,25,26,31]; (3) the compressive strength and elastic modulus increase monotonically with confining pressure [24]; (4) increasing temperature results in the decrease of mechanical properties such as resilient modulus, compressive strength, and flexural strength, the temperature sensitivity and loading rate dependence for mechanical properties with higher asphalt-to-cement content ratio (A/C) are greater than those with lower A/C [22,25,32,33,45]; (5) the storage modulus gradually decreases with increasing temperature and decreases with the increase of A/C and water content [29].…”

“…As a fundamental problem with respect to mechanical behaviors, the constitutive relationship of the material is regarded as the basis of the research on the performance of structural analysis. Up until now, a variety of empirical or theoretical approaches have been successfully developed and applied in modelling such behaviors for different materials [8,[21][22][23][24][25]35,46,48]. However, relevant studies for CA mortar are limited at present.…”

“…However, relevant studies for CA mortar are limited at present. From a summary standpoint, present research can be classified into two categories: (a) Empirical or semi-empirical models, where the constitutive relationship are accounted for based on the observation of the experimental results; for example, Wang et al [24] developed a modified Domaschuk model to characterize the full deviatoric stress-strain relationship of CA mortar in both the confined and uniaxial cases based on the experimental results of a triaxial compressive test. Further, by coupling of the effects of loading rate and temperature sensitivity, Wang et al [25] proposed a stress-strain model for CA mortar by using a modified Guo's model.…”

“…To date, much effort has been directed towards the exploration of relevant properties for CA mortar due to its crucial role in safety and life control for railway track structures. Generally, three major categories can be identified in present research topics referring to CA mortar: (a) physical and chemical properties of fresh CA mortar [9][10][11][12][13][14][15][16][17][18][19], which mainly incorporate the properties of rheology, water absorption and expansibility, seepage, and expansibility; (b) mechanical properties of hardened CA mortar [8,[20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36], where particular attention is chiefly paid to the issues of critical compressive strength, Young's modulus, strain-stress relationship, strain rate effect, and temperature sensitivity; (c) investigations of the durability properties of hardened CA mortar [37][38][39][40][41][42][43][44][45][46][47], which primarily aim at the behaviors of fatigue properties, creep and stress relaxation, freezing resistance, and water erosion. 2…”