Issue 41

E. Nurullaev et alii, Frattura ed Integrità Strutturale, 41 (2017) 369-377; DOI: 10.3221/IGF-ESIS.41.48 374 composition. Analysis of numerical experimentation results has shown, that increase of plasticizer volume fraction from 0.05 to 0.3 (experiment temperature is 223 K; four – fraction silica) causes decrease of rupturing stress (from 12 to 9 MPa ) at slight deformation increase (from 26 to 27%,). Experiment temperature increase does not change this tendency (Tab. 3). Increase of silica fraction quantity in the PCM from two to four causes decrease of conventional rupturing stress from 28 to 11 MPa at rupturing deformation increase from 12 to 26% (numerical experiment temperature is 223 K, 0.1 vol. fraction plasticizer). If Т = 273 К, 0.1 vol. fraction plasticizer, conventional rupturing stress decreases from 12 to 4 MPa at deformation increase from 17 to 36%; if Т = 323 К – from 3 МPа (22%) to 1 МPа (45%). Basic requirements to different coverings, especially to road asphalt, are the followings: rupturing stress – ap. 8 MPa and deformation – at least 12 – 15% at the temperature 223K. Table 3 : Numerical experimentation results about dependence of rupturing stress from rupturing deformation of the PCM. According to the Tab. 3, PCM based on 3D-linked high-molecular rubbers, filled with four silica fraction mixture at plasticizer volume fraction 0,05 in the binder, fully complies with given requirements. Fig. 1 presents envelopes of rupture points for the PCM according to T. L. Smith for different filler fraction values at 0.05 plasticizer volume fraction in the binder and cross-binding concentration ν ch = 3 mol/m 3 at different temperatures of numerical experiment. It is obvious, that PCM filled with optimum mixture of four silica fractions meets the requirements to different coverings, especially to road asphalt. Figure 1 : Envelopes of rupture points for polymer composite material according to T. L. Smith for different filler fraction values at 0.05 plasticizer volume fraction in the binder and ν ch = 3 mol/m 3 at different temperatures of numerical experiment. Experiment temperature : 1 – 223 К ; 2. – 273 К ; 3. – 323 К; a - Two-fraction silica; b - Four-fraction silica; c - Three-fraction silica. Plasticizer volume fraction φ sw = 0.05 vol. fraction Dispersed filler Two-fraction silica Three-fraction silica Four-fraction silica Experiment temperature. К Experiment temperature. К Experiment temperature. К 223 273 323 223 273 323 223 273 323 σ b . МPа 29 12 3 5.5 2.1 0.6 12 4 1 ε b . % 12 16 22 42 58 75 26 36 45 Plasticizer volume fraction φ sw = 0.1 vol. fraction σ b . МPа 28 12 3 7 2.6 0.75 11 4 1 ε b . % 12 17 22 37 52 64 26 36 45 Plasticizer volume fraction φ sw = 0.3 vol. fraction σ b . МPа 25 9 2 6 2 0.6 9 3.2 1 ε b . % 13 18 22 38 54 65 27 39 47