dredging is a four-part process: loosening the material, bringing the material to the surface together extraction , transportation and disposal. the extract can be disposed of locally or transported by barge or in a liquid suspension in kilometre long pipelines.
hot-mix asphalt concrete commonly abbreviated as hma this is produced by heating the asphalt binder to decrease its viscosity, and drying the aggregate to remove moisture from it prior to mixing. mixing is generally performed with the aggregate at about 300 f roughly 150 c for asphalt and 330 f 166 c for polymer modified .
soil structure describes the arrangement of the solid parts of the soil and of the pore space located between them. it is determined by how individual soil granules clump, bind together, and aggregate, resulting in the arrangement of soil pores between them. soil structure has a major influence on water and air movement, biological activity, root growth and seedling emergence.
in chemistry, efflorescence which means 'to flower out' in french is the migration of a salt to the surface of a porous material, where it forms a coating. the essential process involves the dissolving of an internally held salt in water, or occasionally in another solvent. the water, with the salt now held in solution, migrates to the surface, then evaporates, leaving a coating of the salt.
erythrocyte aggregation is the reversible clumping of red blood cells rbcs under low shear forces or at stasis. stacked red blood cells flow across drying slide erythrocytes aggregate in a special way, forming rouleaux .
simple sludge drying beds are used in many countries, particularly in developing countries, as they are a cheap and simple method to dry sewage sludge. drainage water must be captured; drying beds are sometimes covered but usually left uncovered. mechanical devices to turn over the sludge in the initial stages of the drying process are also .
milling also refers to the process of breaking down, separating, sizing, or classifying aggregate material. for instance rock crushing or grinding to produce uniform aggregate size for construction purposes, or separation of rock, soil or aggregate material for the purposes of structural fill or land reclamation activities. aggregate milling .
curing is a chemical process employed in polymer chemistry and process engineering that produces the toughening or hardening of a polymer material by cross-linking of polymer chains. even if it is strongly associated with the production of thermosetting polymers, the term curing can be used for all the processes where starting from a liquid solution, a solid product is obtained.
mixing of asphalt and aggregate is accomplished in one of several ways: hot-mix asphalt concrete commonly abbreviated as hma this is produced by heating the asphalt binder to decrease its viscosity, and drying the aggregate to remove moisture from it prior to mixing.
this process is then repeated for various moisture contents and the dry densities are determined for each. the graphical relationship of the dry density to moisture content is then plotted to establish the compaction curve. the maximum dry density is finally obtained from the peak point of the compaction curve and its corresponding moisture .
recycled aggregate in the uk is defined as aggregate resulting from the processing of inorganic material previously used in construction. to ensure the aggregate is inert, it is manufactured from material tested and characterised under european waste codes.
thickening is often the first step in a sludge treatment process. sludge from primary or secondary clarifiers may be stirred often after addition of clarifying agents to form larger, more rapidly settling aggregates. primary sludge may be thickened to about 8 or 10 percent solids, while secondary sludge may be thickened to about 4 percent solids.
as with any industrial process there is a group of terms that identify and define what screening is. terms like blinding, contamination, frequency, amplitude, and others describe the basic characteristics of screening, and those characteristics in turn shape the overall method of dry or wet screening.