Research of Strength, Frost Resistance, Abrasion Resistance and Shrinkage of Steel Fiber Concrete for Rigid Highways and Airfields Pavement Repair

Željko Kos,Sergii Kroviakov,Iryna Grynyova,Vitalii Kryzhanovskyi

doi:10.3390/app12031174

Željko Kos, Sergii Kroviakov + Show 2 more

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https://doi.org/10.3390/app12031174

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Abstract

High-early strength fiber-reinforced concretes are effective materials for the full depth repair of rigid highway and airfield pavements. A comprehensive study was carried out on the influence of the amount of steel anchor fiber and hardening accelerator on properties that are important for repairing concrete. A two-factor experiment was carried out, in which the influence of the hardening accelerator and fiber dosages on the strength, frost resistance, wear resistance and shrinkage of repaired steel-fiber-reinforced concrete for rigid pavements was studied. The investigated concretes contained 400 kg/m3 of cement and polycarboxylate plasticizer in the amount of 1.2% of the cement content. It has been established that the optimal concrete compositions are with the amount of Sika Rapid 3 hardening accelerator from 1 to 2% of the cement content and the steel fiber amount from 60 to 90 kg/m3. Optimal fiber-reinforced concrete compositions have a reduced shrinkage during hardening, and at the age of 2 days they have a compressive strength of at least 55 MPa and a flexural strength of at least 8.5 MPa. At the design age, the fiber-reinforced concrete compressive strength is 85–90 MPa, its flexural strength ranges from 15.5 to 17.5 MPa, it has a frost resistance of F200 and abrasion not higher than 0.24 g/cm2. These properties ensure the high durability of the repair material.

Highlights

Introduction and BackgroundCement concrete pavements are a priority in the construction of highway and airfield pavements [1]
With a fixed W/C ratio, it would be impossible to ensure the equal workability of the mixture, which is important during repairs, or it would be necessary to change the amount of plasticizer and would not allow us to provide its optimal amount
Regardless of the hardening accelerator amount, fiber-reinforced concretes, with a fiber amount of 50 kg/m3 and with a fiber amount of 100 kg/m3, are characterized by significantly less shrinkage compared to unreinforced ones

Summary

Introduction

Introduction and BackgroundCement concrete pavements are a priority in the construction of highway and airfield pavements [1]. The minimum design flexural strength for rigid highway pavements according to [2] is in the range of 4–5 MPa, and the minimum concrete grade for airfield pavements is C 32/40 [3]. The proper operational condition of rigid highway and airfield pavements provides for the use of high-early strength repair concrete mixtures to increase their bearing capacity and maintain traffic safety [4,5]. The usage of fast-hardening concretes makes it possible to reach values of flexural strength of 2.8–5.0 MPa and compressive strengths of 21–50 MPa after the first day of hardening [6,7]. Fast-hardening concretes are characterized by low W/C (0.3 and less) due to early and grade compressive strengths of more than 70–90 MPa and flexural strengths of more than 9 MPa being achieved [10]. Due to the large amount of cement in the mixture, shrinkage deformations increase, especially in the early ages of hardening [12]

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