“Computational <strong>Civil</strong> <strong>Engineering</strong> 2005”, <strong>International</strong> Symposium 177The computational analysis consists in obtaining the strain and stress state withinpavement structure (table 2 and 3) by using elastic linear software, ALIZE 5, understandard load of our country (115 kN).Table 3. The pavement structure with geocomposite (2), taking in accountsMixtureh layermPoissson ratio,µElasticmodulus,MPawearing course BA16-A 266or wearing course BA16-B 2780.04 0.35or wearing course MASF16-A 312or wearing course MASF16-B352geocomposite 0.002 0.3 73000existent asphalt layers 0.095 0.35 300macadam 0.08 0.27 400ballast 0.20 0.27 239soil ∞ 0.35 110To estimate the dynamic elastic modulus (E) for the four asphalt mixtures fromwearing course it was used the indirect tensile fatigue test. The frequency forindirect tensile fatigue test was 1 Hz.The samples were subjected to conditions that can appear in summer period (40 o Ctemperatures) for both tests performed.The calculus was made at two depths of asphalt wearing layer: at the top of thelayer (z = 0 m) and at the bottom of the layer (z = 0.04 m), in the axis of appliedload.3. RESULTSBase on those presented above we can calculate the octahedral shear stress ratio(OSSR) for asphalt mixture from wearing course. Thus, we have the resultspresented in table 4.4. CONCLUSIONSFrom this research the following conclusions can be drawn:• the OSSR parameter indicate potential for rutting of an asphalt mixtureunder traffic loads;
178 E. Diaconu, C. Răcănel• OSSR presents greater values at the top of asphalt layer than at the bottomof asphalt layer for 40 o C test temperature, irrespective of mixture;• the all of the OSSR values (table 4) are below 1, which signify thatoctahedral shear strength of material in the layer is not exceeded; theasphalt mixtures are suitable from permanent deformation point of view;Loadingratemm/min.0,4612,5Table 4. The OSSR values for asphalt mixtures in wearing courseAsphaltmixtureBA16-ABA16-BMASF16-AMASF16-BBA16-BMASF16-B50 BA16-BPavementstructure1 - the structure without geocomposite2 - the structure with geocomposite12121212121212z,mσ 1 ,MPaσ 3,MPaσ octMpaσ octMPaσ oct,sMPaOSSR0 0,5793 0,0685 0,24 0,24 0,54 0,9520,04 0,467 0,2257 0,31 0,11 0,44 0,3680 0,5667 0,08743 0,25 0,23 0,52 0,8700,04 0,4444 0,2691 0,33 0,08 0,42 0,2530 0,5851 0,05991 0,23 0,25 0,59 0,9020,04 0,4674 0,2252 0,31 0,11 0,48 0,3370 0,5731 0,07784 0,24 0,23 0,58 0,8290,04 0,4447 0,2687 0,33 0,08 0,46 0,2320 0,6009 0,03612 0,22 0,27 0,68 0,7900,04 0,4679 0,2245 0,31 0,11 0,56 0,2790 0,5912 0,05077 0,23 0,25 0,68 0,7430,04 0,4457 0,2675 0,33 0,08 0,54 0,1950 0,6189 0,00908 0,21 0,29 0,74 0,8040,04 0,4678 0,2248 0,31 0,11 0,60 0,2570 0,6123 0,01911 0,22 0,28 0,74 0,7730,04 0,4465 0,2663 0,33 0,08 0,58 0,1820 0,5851 0,05991 0,23 0,25 0,70 0,6490,04 0,4674 0,2252 0,31 0,11 0,60 0,2560 0,5731 0,07784 0,24 0,23 0,69 0,6010,04 0,4447 0,2687 0,33 0,08 0,57 0,1780 0,6189 0,00908 0,21 0,29 0,83 0,6510,04 0,4678 0,2248 0,31 0,11 0,68 0,2160 0,6123 0,01911 0,22 0,28 0,82 0,6270,04 0,4465 0,2663 0,33 0,08 0,66 0,1540 0,5851 0,05991 0,23 0,25 2,04 0,1440,04 0,4674 0,2252 0,31 0,11 1,93 0,0640 0,5731 0,07784 0,24 0,23 2,03 0,1350,04 0,4447 0,2687 0,33 0,08 1,91 0,046
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A viscoelastic-plastic prediction o
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