The effects of the concentration and functionalization of carbon nanotubes on the degree of conversion of epoxy groups in epoxy-amine compositions based on ED-20 epoxy oligomer and the PEPA curing agent are studied. It has been shown that increasing the concentration of functionalized carbon nanotubes (CNT) from 0 to 0.5 % increases the degree of conversion of the epoxy groups during curing at a room temperature. Further increase in concentration CNT of up to 1 % does not effect on the reaction kinetics. For native CNT not established such a relationship. Explains such a pronounced effect on the f-CNT aminolysis reaction kinetics and ultimate degree of conversion of epoxy groups, apparently, the catalytic effect of oxygen-containing groups (hydroxyl, carboxyl, and others) grafted to the surface of CNTs and their direct involvement in the reaction. By optical microscopy showed that the size of the agglomerates of nanotubes were substantially higher in the native systems than in the system with the functionalized nanotubes. These results may be important for the development of creation of epoxy composites modified by nanoparticles.
It is known that the supporting capacity of asphalt concrete depends on the weakest component of the system. Currently, there are two main ways to increase strength and shear resistance of asphalt concrete: modification of bitumen binder or regulation of granulometric composition, in the trend of increasing the rock stone content. However, in the first case, the structure-forming effect of multi-crushed stone asphalt concrete is not fully used, in the second - due to the high bitumen consumption necessary to fill intergranular bugholes, the mixture segregates. The elimination of this disadvantage was provided by the introduction of fine-fibred filler into mixture. Stone mastic asphalt concrete (SMA) was created, which fundamentally combines the advantages of impacted low-crushed stone concrete and maximum structural asphalt-concrete, which are widespread in some countries for roads with high traffic stream.
In this paper, we studied the effect of various types of stabilizing additives on the performance of stone mastic asphalt concrete.
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