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Durability of Modified Fiber Concrete for Rigid Pavements

Mishutin Andriy ; Odessa State Academy of Civil Engineering & Architecture
Zeljko Kos ; University North
Iryna Grynyova ; Odessa State Academy of Civil Engineering & Architecture
Chintea Lucia ; Odessa State Academy of Civil Engineering & Architecture

Sažetak

Modified concretes and fiber concretes for rigid pavements have been investigated.
Four-factor experiment was conducted. The amount of Portland cement,
polypropylene fiber, metakaolin and polycarboxylate superplasticizer varied in the
experiment. All mixtures had the same mobility S2.
The active mineral additive metakaolin increases the compressive strength of
concrete and its tensile strength in bending. The amount of metakaolin at the level of
15..20 kg/m3 is rational. Due to a decrease in W/C with an increase in the amount of
superplasticizer Coral ExpertSuid-5 to 0.9..1%, the compressive strength of concrete
increases by 5..7 MPa, the tensile strength in bending increases by 0.5..0.6 MPa. Due
to the introduction of polypropylene fiber, the tensile strength of concrete in bending
increases by 0.6..0.9 MPa, the frost resistance of concrete increases by 50 cycles. Due
to the use of a rational amount of superplasticizer and metakaolin, the frost
resistance of concretes and fiber concretes concrete increases by 50-100 cycles. The
use of a rational amount of modifiers and fiber reduces the abrasion of concretes by
40..45%.
The developed modified fiber concretes of rigid pavements, depending on the
amount of Portland cement, have compressive strength from 55 MPa to 70 MPa,
tensile strength in bending from 8 MPa to 9.5 MPa, frost resistance from F350 to
F450, abrasion from 0.30 to 0.40 g/cm2
. Such strength, frost resistance and abrasion resistance allows the use of fiber concretes in pavements with the greatest load and
ensures high durability of the material and corresponds to the directions and tasks of
the state scientific and technical program "National Transport Strategy of Ukraine for
the period up to 2030"

Ključne riječi

pavement; concrete; strength; durability; modifiers; fiber

Hrčak ID:

261633

URI

https://hrcak.srce.hr/261633

Datum izdavanja:

30.8.2021.

Posjeta: 821 *