INVESTIGATION OF OPTIMUM SHOTCRETE MIXING RATIO FOR SLOPE PROTECTION BY USING FLY ASH – A REVIEW

Fly ash is a coal combustion product that is composed of the particulates (fine particles of burned fuel) that are driven out of coal-fired boilers together with the flue gases. Ash that falls to the bottom of the boiler's combustion chamber is called bottom ash. In modern coal-fired power plants, fly ash is generally captured by electrostatic precipitators or other particle filtration equipment before the flue gases reach the chimneys. Fly ash concrete is one of the main directions for the development of concrete materials in the future. Fly ash can offer many benefits, both economically and environmentally. Through the laboratory model tests conducted as stated in the summary of studies, there is a comparison of strength and stability of fly ash slope with and without the addition of fly ash in the samples. Fly ash is used as filling material and plastic scraps and different geo-synthetics are used as reinforcement materials. The square and different footings are rest at various position on steep slope of different angles. From experimental works load carrying capacity, settlement and deformations of fly ash slopes are determined and from the data, load –settlement curves have been reported. In order to study the mechanical properties of fly ash concrete, the compressive strength, splitting tensile strength and flexural strength of concrete under different ages and different ultra-fine fly ash particle sizes and dosages were tested. The slump of concrete mix under different fly ash particle size increases with the increase of fly ash content, but the rate of increase decreases gradually. In conclusion, it is proved that the samples with the addition of fly ash have a higher strength and the amount of water needed in the samples also lesser Under the same fly ash content, the smaller the particle size of fly ash particles, the greater the slump of the corresponding fly ash concrete, and it has the exponential relationship between the particle size and the particle size of fly ash.