Abstract
The research was conducted in order to determine the effect of the polymer additive on the adhesion between the fiber and the cement-sand matrix, since the involvement stage of the composite fiber material directly depends on the adhesion value between these dissimilar components. Throughout the study, the issue at stake was to determine the optimal method for adhesion increasing to assess its effectiveness, and also to carry out an experiment and obtain actual numerical change values of the adhesion to carbon fiber (the assessment was made considering changes of the strength parameters). According to the results of conducted testings, the tensile strength during the bend almost wasn’t affected in resin-injected samples with the amount of fiber of 1 and 3% (increments of 12.7 and 15.7%, respectively). Despite this, the combined application of a resin with the same amount of fiber gave the increments of 34 and 20%, respectively. Conclusions are drawn about the prospects of polymer additives usage in carbon fiber reinforced concrete. The mechanism of increasing the carbon fiber involvement in the composite behavior is considered, the positive effect is confirmed by the study of the chemical processes that arise during the interaction of fiber and water-soluble resin.
Highlights
The increase of the construction volumes, of the erection of buildings and structures, the state trend for technological development of the country and its getting into the top five world economies is impossible in the 21st century without the integration of original engineering solutions, high-strength materials and innovative technologies
Studying the experience of foreign colleagues and analyzing the current situation considering high-rise buildings erection shows that the future of modern construction will belongs to the use of Ultra High Performance Concrete (UHPC), or especially high-strength concrete with a compressive strength of more than 120 MPa
As a result of the calculations, the following mathematical models for designing the heavy types of concrete with carbon fiber were obtained in coded factors as follows: Rc = 50.2 + 14.7X1 – 1.1X2 – 2.8X12 –2.8X22; Rb = 8.1 + 0.9X1 + 0.6X2 + 0.3X1X2 + 0.5X12; ρ = 2302.9 + 79.0X1; w = 3.6 – 0.8X1 – 0.3X12
Summary
The increase of the construction volumes, of the erection of buildings and structures, the state trend for technological development of the country and its getting into the top five world economies is impossible in the 21st century without the integration of original engineering solutions, high-strength materials and innovative technologies. Studying the experience of foreign colleagues and analyzing the current situation considering high-rise buildings erection shows that the future of modern construction will belongs to the use of Ultra High Performance Concrete (UHPC), or especially high-strength concrete with a compressive strength of more than 120 MPa. In order to implement and manufacture such materials, it is necessary to use a complex approach to solve a variety of problems, such as:. The paper considers an increment method for the physical and mechanical characteristics of high-strength fine-grained concrete with carbon fiber by injecting a watersoluble epoxy resin DEG-1
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