MIX DESIGN OF SELF COMPACTING CONCRETE (SCC) Self Compacting Concrete has to be designed and tested before it is produced and used for construction. During SCC evaluation, the local materials and equipments have to be tested to find out the right concrete mix proportions and mixing times suitable for the element to be cast. Various(…)
Special Concrete
Special concrete provides information on which are used in modern times, for increased strength and construction of skyscrapper or special structures. This include roller compacted, fibre reinforced, light weight, sulphur impregnated, bioconcrete, papercrete, recycled aggregate, self compacting, reactive powder,.ferro cement, silica fume, flyash, ready mix concrete.
FIBRE REINFORCED CONCRETE IN PAVEMENTS
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(…)
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)(…)
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(…)
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(…)
ROLE OF FIBER REINFORCEMENT IN CONCRETE
The role of the fiber reinforcement in concrete is not to increase strength, although modest strength increases may occur. Rather, the role of discrete, discontinuous, randomly oriented fibers is to bridge the cracks that develop in concrete either as it is subjected to environmental changes (such as drying) or as it is loaded. If the(…)
APPLICATION OF FERRO-CEMENT IN CONSTRUCTION
Ferro-cement In Construction < ?xml:namespace prefix = o /> Ferro-cement is a relatively new material consists of wire meshes and cement mortar. Developed by P.L.Nervi, an Italian architect in 1940. Widely used due to the low self weight, lack of skilled workers, no need of framework etc. Quality of ferro-cement works are assured because the(…)