Fibre reinforced concrete (FRC) is defined as a composite material consisting of concrete reinforced with discrete randomly but uniformly dispersed short length fibres. The fibres can be made of steel, polymer or natural materials. Woven fabrics, long wires, bars, and continuous wire mesh are not considered discrete fibres. FRC is considered as a material of(…)
Concrete Technology
PUMPED CONCRETE PUMP TYPES & SELECTION
Pumped concrete is the concrete which is transported to heights by means of pumping using concrete pumps. This method is used where large quantity of concrete work is involved at greater height, where other means of transporting is not easy to do. Concrete pumps have been known for more than 50 years. In modern times,(…)
APPLICATIONS OF STEEL FIBER REINFORCED CONCRETE
APPLICATION OF STEEL FIBER REINFORCED CONCRETE STEEL FIBER FOR PRE-CAST CONCRETE APPLICATION: Manholes, Risers, Burial Vaults, Septic Tanks, Curbs, Pipes, Covers, Sleepers APPLICATIONS IN OTHER STRUCTURES: A) Highway And Airfield Pavements: Repair of existing pavement. Reduction in pavement thickness. Increase in resistance to impact. Increase in transverse and longitudinal joint spacing Smooth riding surface. B)(…)
CONCRETE MIX DESIGN USING CRUSHED SAND
The process of selecting suitable ingredients of concrete and determining their relative amounts with the objective of producing a concrete of the required, strength, durability, and workability as economically as possible, is termed the concrete mix design. The proportioning of ingredient of concrete is governed by the required performance of concrete in 2 states, namely(…)
PREPLACED AGGREGATE CONCRETE (PAC)
Pre-placed aggregate concrete (PAC) is concrete that is made by forcing into the voids of a mass of clean, graded coarse aggregate densely pre-packed in formwork (figure 1). PAC is used where placing conventional concrete is extremely difficult, such as where massive reinforcement steel and embedded items are present, in underwater repairs, concrete and masonry(…)
MAINTENANCE OF CONCRETE STRUCTURES
Maintenance of Concrete Structures: Modern concrete is a very durable construction material and, if properly proportioned and placed, will give very long service under normal conditions. Many concrete structures, however, were constructed using early concrete technology, and they have already provided well over 50 years of service under harsh conditions. Such concrete must be inspected(…)
BENEFITS OF USING STEEL FIBRES IN CONCRETE
The use of steel fibre in concrete can improve its many properties. The benefits of using steel fibres in concrete are as follows: 1. Steel Fibres are generally distributed throughout a given cross section whereas reinforcing bars or wires are placed only where required 2. Steel fibres are relatively short and closely spaced as compared(…)
ADVANTAGES OF HIGH PERFORMANCE CONCRETE
Advantages of High Performance Concrete (HPC) : The advantages of using high strength high performance concretes often balance the increase in material cost. The following are the major advantages that can be accomplished. 1.Reduction in member size, resulting in increase in plinth area/useable area and direct savings in the concrete volume saved. 2.Reduction in the(…)