Shotcrete/sprayed concrete is a specialty concretethatis projected at high velocity on the surface of a construction through a sealed and pressure-resistant hose. Application of shotcrete/sprayed concrete is based on a flexible and economic technique. The concrete mix is hydrated with water and blown from a spraying nozzle onto the substrate. Shotcrete/sprayed concrete possesses certain advantages over conventional concrete. They impartstrongdurability and high mechanical strength to constructions. They use lower ratio of water and cement, resulting in high compressive strength and dense compaction. Furthermore, application of shotcrete/sprayed concrete enables the construction to achieve low water permeability and enhanced bond strength. It also reduces the formwork time and cost.
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Shotcrete/sprayed concrete can be conveyed using two techniques:wet mix and dry mix. In wet mix, water is added to the mixture of cement, aggregate, and sprayed concrete admixture. Then this wet mix is pumped into a nozzle where air and shotcrete accelerators are added.Wet mix shotcrete/sprayed concrete is used to provide a decorative finishwith high output capacity and high durability. In dry mix, cement, aggregate, and admixture areblended in a specific ratio without water and placed in a delivery equipment.The mixed material is then conveyed by an air compressor through a hose or pipe with high velocity. Dry sprayed shotcrete/sprayed concrete has excellent flexibility and provides high early strength. Shotcrete/sprayed concrete mix properties can be improved by addition of ingredients such as silica fume, air-entraining admixtures, fibers, and accelerators.
Shotcrete/sprayed concrete is particularly suitable for use in awide range of construction areas such as new construction, underground construction, water-retaining structures, protective coatings, and free formed structures. Specialty construction structures including shell roofs, domes, barrel vaulting, bank vaults, blast-proof structures, and pilled wall facing use shotcrete/sprayed concrete. It has potential use in underground construction, especially in tunneling system such as tunnel linings, tunnel and underground chamber lining, and tunnel walls. Furthermore, shotcrete/sprayed concrete is used in constructing water-retaining structures including sea and river walls, storage reservoirs, dams, swimming pools, water towers, and canal linings. Refractory linings, rock and soil stabilization, and pipeline encasementare some of the different types of protective coatings that use shotcrete/sprayed concrete. Additionally, free form structures such as climbing walls, sculptures, and theme park elements are constructed using shotcrete/sprayed concrete.
Europe has dominated the global market for shotcrete/sprayed concrete in the past few years. Europe constituted the largest market share in 2014 due to rising demand from economically developed countries such as Germany, Italy, Austria, and Switzerland. North America also held significant market share in 2014. Asia Pacific is projected to be the fastest-growing market for shotcrete/sprayed concrete during the forecast period. Increasing demand from developing countries such as Japan, Australia, and China drivesrapid growth of the marketin this region. Europe and Asia are estimated to witness a growing market trend in the next few years. Latin America and the Middle East are expected to be the emerging markets for shotcrete/sprayed concrete during the forecast period.
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Growing population and current economic development in countries inAsia Pacific leads to improvement in civil construction. Underground road and tunnel construction activities havebeen increased to avoid traffic in densely populated regions of Asia Pacific in the recent past. Thus, risingdemand forunderground constructions is anticipated to fuel growth of the shotcrete/sprayed concrete market in the next fewyears. Furthermore, shotcrete/sprayed concrete manufacturers are developinginnovative technology and advanced equipment for concrete application. This, in turn, is likely to drive demand for shotcrete/sprayed concrete during the forecasted period.
Some of the key players in the shotcrete/sprayed concrete market include Atlas Copco AB, BASF SE, CEMEX S.A.B. de C.V., Gunform International Limited, Kryton International Inc., Lkab Berg &Betong AB, Prestige Concrete Products, Sika AG, Tarmac Building Products Limited, and The Euclid Chemical Company.
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