INFLUENCE OF MULTILAYER NANOTUBES ON FRACTURE TOUGHNESS
Experimental research results of the stress intensity factor at normal separation, К IC, and crosssection shift, K IIC, respectively, of high-strength concrete are presented. Research on the specific power changing inputs on quasi-static destruction is carried out.The compact structure on the basis of the Portland cement modified with carbon nanodispersed systems has been studied. Carbon nanotubes Graphistrength by «Arkema» dispersed into the hydrodynamic plant in the solution of surface-active agent (SAA) Polyplast SP-1 are used as modifying additives. An increase of the cross-breaking strength of a fine grain concrete up to 45,1 % and of the compressing strength up to 96,8 % was observed. The increase of concrete strength is related to morphological changes of new crystalline hydrate formations providing a less defective structure of cement matrix with high density.