The use of steel fiber reinforcement in Lee Tunnel Project – model code new design perspective – precast segment and shaft slip formed inner lining

The presented research program is focused on the design of a structural lightweight fiber-reinforced concrete harnessing an internal curing process. Pre-soaked waste red ceramic fine aggregate and pre-soaked artificial clay expanded coarse aggregate were utilized for the creation of the mix. Copper-coated steel fiber was added to the mix by volume in amounts of 0.0%, 0.5%, 1.0%, and 1.5%. Test specimens in forms of cubes, cylinders, and beams were tested to specify the concrete characteristics. Such properties as consistency, compressive strength, splitting tensile strength, static and dynamic modulus of elasticity, flexural characteristics, and shear strength were of special interest. The achieved concrete can be classified as LC12/13. A strength class, according to fib Model Code, was also assigned to the concretes in question. The proposed method of preparation of concrete mix using only pre-soaked aggregate (with no extra water) proved to be feasible.

Download Full-text

Influence of Hooked-EndSteel Fibers on Fresh and Hardened Properties of Steel Fiber Reinforcement Self-Compacting Concrete (SFRSCC)

Journal of Physics Conference Series ◽

10.1088/1742-6596/1198/3/032005 ◽

2019 ◽

Vol 1198 (3) ◽

pp. 032005

Author(s):

Faiz Sulthan ◽

Saloma

Keyword(s):

Steel Fiber ◽

Fiber Reinforcement ◽

Self Compacting Concrete ◽

Hardened Properties

Download Full-text

Efficiency Comparison of Fiber Reinforcement in Vibrated аnd Centrifuged Concretes at Different Types of the Applied Heavy Aggregate

Materials Science Forum ◽

10.4028/www.scientific.net/msf.974.288 ◽

2019 ◽

Vol 974 ◽

pp. 288-292

Author(s):

Sergey A. Stelmakh ◽

Anatoliy I. Shuyskiy ◽

Evgeniy M. Shcherban ◽

Albert Yu. Prokopov

Keyword(s):

Steel Fiber ◽

Density Ratio ◽

Fiber Reinforcement ◽

Crushed Stone ◽

Heavy Weight ◽

Different Types ◽

Efficiency Comparison ◽

The Impact

The article considers and evaluates the impact of dispersed reinforcement of heavy concretes manufactured by means of vibration and centrifugation, various types of fibers on their strength-density ratio. The options of applying different types of heavy-weight aggregates for these concretes: crushed stone, limestone and sandstone are considered. The highest strength-density ratio is registered in centrifuged crushed stone fibrous concretes, and all types of centrifuged concretes has the ratio higher than vibrated concretes with the same composition of the studied fibers. The highest growth of the strength-density ratio for the centrifuged crushed stone fibrous concretes as compared with the vibrated ones was identified in case of dispersed reinforcement with steel fiber.

Download Full-text