A STUDY ON ENHANCING CBR PROPERTIES OF GRADED GRAVEL SOILS WITH CRUSHER DUST AND BOTTOM ASH

A STUDY ON ENHANCING CBR PROPERTIES OF GRADED GRAVEL SOILS WITH CRUSHER DUST AND BOTTOM ASH

BODDU SRILAKSHMI1, K. PRAVALLIKA2

1PG Schoolar, Dept. of Civil Engineering, PBR Visvodaya Institute of Technology & Science, Autonomous, Affiliated to JNTUA, Kavali, SPSR Nellore, A.P, India-5242201.

2Assistant Professor, Dept. of Civil Engineering, PBR Visvodaya Institute of Technology & Science, Autonomous, Affiliated to JNTUA, Kavali, SPSR Nellore, A.P, India-5242201.

---------------------------------------------------------------------***---------------------------------------------------------------------

Abstract - Major streets and highways are perfect candidates for flexible pavement because, when laid in very thick layers, it can endure large and more frequent traffic flows. Repair work is quite straightforward since this pavement type requires frequent maintenance. Standard standards are not met by the majority of the soils.

However, disposing of the massive amounts of industrial waste that are produced by fast industrialization is no easy feat. Inhaling fly ash, a significant component of coal ash and a byproduct of thermal power plants, may cause asthma attacks, inflammation, and immune system responses if it becomes stuck in the lungs. According to research, these particles are associated with the top four killers. cardiovascular disease, cancer, lung disease, and stroke. Fly ash toxics may move about in the ecosystem not just by leaching, but also via erosion, runoff, and even fine particles in the air. The chemicals in fly ash are dangerous because they may escape and travel across the ecosystem. When stone crushing facilities produce aggregate of the desired size, they leave behind a byproduct known as crusher dust.

As a concentrated byproduct of crushing, quarry dust is ideal for use as aggregates in concrete, particularly fine aggregates. Quarries produce dust as a byproduct of crushing rock into different sizes; this waste product is known as quarry dust. Crusher dust is a viable substitute for coarse-grained, non-plastic soils due to its inherent properties, such as being non-plastic, incompressible, and having high dry densities. In this work, graded gravel-crusher dust mixtures are investigated for compaction and CBR characteristics using stone crusher dust instead of particles smaller than 4.75 mm. Through the preservation of non-plastic conditions, the aforementioned mixtures achieved high dry densities and CBR values. You may utilize GC1, GC2, GC3, and GC4 as base courses since they have achieved CBR values larger than 60.

On the other hand, GC5, GC6, and GC7 can be used as sub base courses because they have achieved CBR values greater than 30. Construction projects may make good use of bottom ash, a significant byproduct of thermal power plants. The CBR values of the graded gravel and Bottom Ash mixtures tested ranged from 60 to 65, which is considered high. The dry densities of the aforementioned mixtures were likewise somewhat high, ranging from 1.8 to 2.02 gm/cc. It is feasible to employ gravel and Bottom Ash mixtures with high CBR values and high dry densities as component layers in the building of flexible pavements.

Key Words:  CBR, Bottam Ash, Gravel, Flexible Pavement.