Lyakhevich G., Grechukhin V., Motamedi S.
https://doi.org/10.35579/2076-6033-2020-12-09
ABSTRACT
The purpose of this study is to study the effect of poly-propylene fibers introduced into the concrete mix on the strength characteristics and reduction of the effect of explosive chipping in concrete when the temperature increases.
Polypropylene fiber forms a three-dimensional reinforcing frame in concrete that accepts tensile forces. Its use increases durability, reduces surface abrasion, increases impact strength, eliminates shrinkage, prevents the formation of cracks, and increases frost resistance.
The following components were used to prepare the concrete mix: M-500 cement, quartz sand, crushed stone, microsilicon, superplasticizer, water, polypropylene fiber. The water-cement ratio in the test was from 0.23 to 0.32.
In order to study the effect of temperature on the strength characteristics of high-strength concrete, 16 concrete mix compositions were prepared.
The samples were heated to a temperature of 800 °C at a heating rate of about 20 °C per minute. After reaching this temperature, the samples were slowly cooled to room temperature for 24 hours, after which the decrease in their mass and residual compressive resistance were measured. When samples are heated in the temperature range from 160 °C to 180 °C in concrete with PPV, channels are formed through which steam escapes during further heating. Tests have shown that there is no explosive chipping effect in samples with polypropylene fiber (PPV). Polypropylene fibers reduce the loss of resistance, and eliminate brittle fracture.
The study examined the effect of the length and amount of PPV on the compressive strength of concrete. The use of polypropylene fibers increases the fire resistance and brittleness of high-strength concrete, contributes to its viscous destruction.
Samples of concrete without PPV after loading completely collapsed, while samples of concrete with PPV under a similar load retained their geometry.
The introduction of fiber into high-strength concrete increases the compressive strength and heat resistance of samples. After melting the concrete, capillaries were formed through which steam can escape from the concrete mass, thus preventing explosive chipping of the concrete.
Keywords: concrete, polypropylene fibers, heat resistance, explosive chipping, fire resistance.
For citation: Lyakhevich G., Grechukhin V., Motamedi S. Fiziko-mekhanicheskie svoystva vysokoprochnogo betona, armirovannogo polipropilenovymi voloknami [Stress-strain behavior of high-strength concrete reinforced with polypropylene fibers]. In: Contemporary Issues of Concrete and Reinforced Concrete: Collected Research Papers. Minsk. Institute BelNIIS. Vol. 12. 2020. pp. 131-152. https://doi.org/10.35579/2076-6033-2020-12-09 (in Russian).
Full text in Russian:
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ISSN 2664-567X (Online)
ISSN 2076-6033 (Print)
ISSN 2076-6033 (Print)