Reactive Powder Concrete with Steel, Glass and Polypropylene Fibers as a Repair Material

Abstract

Repairing of reinforced concrete structures is currently a major challenge in the construction industry and is being put back into operation with a slight loss in load carrying capacity. Damage occurs due to many factors that reduce the strength of concrete structures and their durability. The aim of this paper is study the compatibility between three types of reactive powder concrete with (steel fibre, glass fibre and polypropylene fibre) as a repair materials and normal strength concrete as a substrate concrete. Compatibility was investigated in three steps. First: individual properties for substrate concrete were studied, these are (slump test, compressive strength, splitting strength, and flexural strength) also, for repair material these are (compressive strength and flexural strength) were determined by using standard ASTM test methods. Second: bond strength of composite cylinder for substrate concrete with different repair materials were evaluated by using slant shear test. Third: compatibility was investigated by using composite prisms of substrate concrete with different repair materials under two-point loading (flexural strength test). From the experimental results concluded, bond strength between reactive powder concrete with glass fibre as a repair material and normal strength concrete as a substrate layer is higher (17.38Mpa) compared with RPC with steel fibre (13.13Mpa) and polypropylene fibre (14.31MPa). Also, it is more compatible due to flexural strength for composite prisms (having higher flexural strength (8.13MPa). Compared with steel fibre (7.44MPa) and polypropylene fibre (6.47MPa). These results due to RPC with glass fibre have good workability with suitable flowability and glass fibre have higher tensile strength compare with other fibre.

Investigation on Properties of Reactive Powder Concrete with Automobile Grinding Steel Waste as Fine Aggregate

“…Basalt fibres which also have the capacity of being non corrosive have been proved to impart high flexural and compressive strength up to 120 MPa along with good durability properties [12]. RPC has been customized to be used as a repair material with glass fibres and it has proved to have good binding strength with the old concrete substrate [13]. Apart from the type of fibres the size of the fibres based on aspect ratio plays a major role in determining the properties of RPC and researchers have extensively worked on studying the behaviour of RPC with different size fraction of fibres [14].…”

Utilizing concrete pillars as an environmental mining practice in underground mines

“…The different types of additives such as rubber, steel, glass and polypropylene fibers were added into concrete to improve the strength and toughness (Liu et al, 2019). Salim et al (2019) explored that the bond strength between the reactive powder concrete with glass fiber as a repair material and the normal strength concrete as a substrate layer is relatively high when compared to the concrete having steel and polypropylene fibers. Kadam et al (2019) found that increasing the percentage of fiber volume, the compressive and flexural strength also increases.…”