The use of composite fibers in heavy concrete
Abstract
The optimum compositions of fiber-reinforced concrete with glass-polymer composite fiber of compressive strength classes B20, B40 and B60 have been developed. Their complex studies demonstrate that based on concrete mixtures with an average density of 2320–2360 kg/m3, air entrainment of 2.5–3.5 %, and workability (slump) of 21–22 cm, the concrete with the following properties can be obtained: average compressive strength of concrete – 28, 54.7 and 83.3 MPa; the average bending tensile strength – 3.5, 4.4 and 5.6 MPa; the breaking strength – 2.92, 5.78 and 6.92 MPa; prismatic strength – 20.1, 40.4 and 60.4 MPa; modulus of elasticity – 35393, 46146 and 51366 MPa; Poisson’s ratio – 0.17, 0.18 and 0.18, respectively. The addition of glass-polymer composite fiber into concrete mixtures in an amount of 0.5, 1.5 and 2.5 % vol. slightly reduces the average density of the mixture by 7–72 kg/m3, increases the air content of mixtures by 0.1–0.6 %, reduces slump by 3–8 cm, and has little influence on the compressive strength. The data on the ultimate bending tensile strength at the moment of crack formation, as well as residual bending tensile strength corresponding to the crack opening in the range 0.5–3.5 mm, were obtained. The shape of a single fiber surface was the determining factor when it broke out of concrete matrix. Three main types of deformation mechanism were identified. The characteristics of fiber-reinforced concrete durability were determined. Overall, the results indicate that fiber-reinforced concrete can be produced with properties that are suitable for wide application.
About the Authors
M. R. NurtdinovV. G. Soloviev
National Research Moscow State University of Civil Engineering
Russian Federation
Russian Federation
Candidate of Sciences (Engineering)
e-mail: s_vadim_g@mail.ru
A. F. Buryanov
National Research Moscow State University of Civil Engineering
Russian Federation
Russian Federation
Doctor of Sciences (Engineering)
e-mail: rga-service@mail.ru
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18.
Review
For citations:
Nurtdinov M.R., Soloviev V.G., Buryanov A.F. The use of composite fibers in heavy concrete. Concrete and Reinforced Concrete. 2021;605(3):33-39. (In Russ.)
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