Quantitative and Qualitative Aspects of Composite Action of Concrete and Dispersion-Reinforcing Fiber

Abstract

The interest in using polymer-dispersed reinforcement in the construction industry in the context of sustainability has led to significant research on this scientific problem. The article is devoted to studying the processes of fiber interaction depending on its dispersion and the concrete matrix, and their combined contact work during the formation of a concrete structure, work under stresses arising in a concrete body, and during a collapse. The physical and mechanical processes of deformation and destruction of the “matrix–fiber” system were studied using high-precision microscopic equipment, and the nature of the work and deformation of fibers in concrete were revealed. The work aimed to establish and characterize the quantitative and qualitative aspects of the concrete matrix and dispersion-reinforcing fiber combined work. It was established that the best values of the adhesion index were observed at a volume content of fiber in the amount of 2% by weight of cement, regardless of the type of dispersion-reinforcing fiber. It was shown that the microstructure of polydispersion-reinforced fiber-cement specimens was denser, and microcracks formed during fracture in polydispersion-reinforced specimens had a smaller opening width. It was established that polydispersion-reinforced concrete had higher values of strength (up to 126%) and deformation (up to 296%) characteristics compared to monodispersion fiber-reinforced concrete.

Theoretical and Experimental Substantiation of the Efficiency of Combined-Reinforced Glass Fiber Polymer Composite Concrete Elements in Bending

“…Table 5 shows that due to the rationally selected glass fiber concrete mixture [51,52,61], it is possible to increase the class of concrete from B30 to B40, while the compressive strength of concrete increases up to 20%. The nature of the destruction of the sample in the form of a symmetrical pyramid demonstrates the optimality of the applied formulation and technology with a uniform distribution of properties in the body of the sample (Figure 7a).…”

“…In addition, the study used testing and auxiliary equipment as well as measurin instruments used earlier in [51,52,[61][62][63][64][65][66][67][68]. Compressive strength tests of specimens "were carried out in accordance with GOST 10180 Concretes.…”

“…The microstructure of samples with fibers was studied using a ZEISS CrossBeam 340 "microscope equipped with an Oxford Instruments X-Max 80 X-ray microanalyzer (Carl Zeiss Microscopy GmbH (Factory), Jena, Germany)" [52,61].…”

“…In addition, the study used testing and auxiliary equipment as well as measuring instruments used earlier in [51,52,[61][62][63][64][65][66][67][68].…”

A Study on the Cement Gel Formation Process during the Creation of Nanomodified High-Performance Concrete Based on Nanosilica

“…For the manufacturing and further testing of samples in this study, the following equipment was used: Technological equipment—laboratory concrete mixer BL-10 (ZZBO LLC, Zlatoust, Russia); Testing equipment—hydraulic press IP-1000 (NPK TEHMASH LLC, Neftekamsk, Russia), R-50 tensile testing machine (IMash LLC, Armavir, Russia); Measuring instruments [ 58 , 59 , 60 , 61 , 62 , 63 , 64 ]. …”