Fly ash exploited in pavement layers in environmentally friendly ways

Abstract

Increased care about the environment is currently evidenced by governmental, industrial, and consumer concern for ozone depletion, solid and liquid waste disposal, and pollutants. This concern has led to an increase in marketing of the "environmentally friendly" aspects of products. In the past, fly ash was generally released into the atmosphere, but pollution control equipment mandated in recent decades now requires that it is captured prior to release. In order to upgrade expansive soils as construction materials, fly ash, which is a waste material, has been selected and successfully used for stabilizing expansive clays in the Thrace region. The strength characteristics of the stabilized soils were measured. Depending upon the soil type, the effective fly ash content for improving the engineering properties of the soil varied between 8% and 12%. Using fly ash in roadwork projects will help the environment reducing the deposited amounts.

Mining Operations in Construction of Main Transport Routes

“…It can be of either type C, which is of high calcium content, or type E of reduced calcium content. Subgrade properties improved with the addition of 2 to 12 % of fly ash [3]. A rate of 10% of Type C used with RAP material in base material and conspiracy manifested between lab and field results in terms if CBR and resiliency value [48].…”

“…Incorporating unconventional construction material in the road construction commenced in the 80's where conventional raw materials such as bitumen, crushed aggregates, and unbound aggregates mixtures began to scarce [1]. The process of producing aggregates materials has been causing extreme disruption to the environment [2] and to the economic owing to the severely depletion the natural resources [3]. Furthermore, the alarming rate of increased waste production is what underpin the efforts to investigate the potential incorporation of various by-products in road construction [4].…”

“…It is of the essence to properly understand the behaviour of any recycled by-products, and investigate the influence on the proposed inclusion with a 138-2 construction material in order to come with a suitable and viable utilization with regards to type of material and the employed dosage. [3] The deficiencies and drawbacks in the quality of produced asphalt binder from native crude-oil producers have its repercussions on the performance of asphalt pavement under oscillating traffic loads [9]. The quality and price of asphalt cement use in the road industry has been another pile of advocating the quest for anther replacement.…”

Utilization of Construction and Demolition Mix Waste in the Fired Brick Production: The Impact on Mechanical Properties

“…Flexural strength, on the other hand, remained constant, whereas split tensile strength decreased [13,16,17]. Fly ash is also being investigated for use in a variety of applications, including cement and concrete production [17], structural infill material [18], pavement [19,20], asphalt mixture [21], and fired bricks [22].…”