Coarse particulate material

Concrete is commonly thought of simply as a mixture of a cement with some coarsely particulate material or aggregate, but it is more than that components of the paste bind chemically to the surface of the aggregate, giving added strength to the whole. The nature of this bonding seems to be similar to that occurring within the paste itself. 

Most coarse particulate material is of primary origin, i.e., directly emitted as particles into the atmosphere. Anthropogenic sources of coarse... 

Emissions from the prilling and granulation sections of AN and CAN plants can be treated by a range of abatement equipment. Particulate material from some granulation plants is relatively coarse in particle size, whereas the prill tower emissions contain very fine particles. Candle filters are normally required for a prill tower emission. They can abate particulate emissions down to 15 mg/m3 of air. For coarser material dry devices such as bag filters or dry cyclones are used. Particulate emissions can be of higher concentration, perhaps up to 30 to 50 mg/m3, but the recovered material is a solid that can more readily be recycled to the process. 

The relationship between alkalinity and FSS concentration and Andean source waters was expected because > 80% of suspended materials and dissolved solids in transport in the Amazon are derived from Andean regions (Gibbs 1972, Stallard 1980, Meade et al. 1985). Although the Andes are also the dominant source of CSS, its seasonal cycle is tied more to the river surface slope than the percent Andean water. In fact, the seasonal pattern of river slope has a nearly identical shape to CSS concentration (Devol et al. 1995). Deposition occurs during periods of low slope (low turbulence), whereas resuspension predominates during high slope (Meade et al. 1985). This changing balance would also explain the relationships between coarse particulate... 

The method is used for determination of the amount of coarse particles in a particulate material or their dispersion. The particles are considered coarse if they do not pass through a 45 im sieve. The process of sieving is conducted with wet material and it is aided by water flushing and brushing. The material retained on the sieve is determined gravimetrically after drying. 

The major proportion of weathered material is transported from the continents into the oceans by rivers as dissolved or suspension load, i.e. in the form of solid particulate material. Depending on the intensity of turbulent flow suspension load generally consists of particles smaller than 30 microns, finer grained than coarse silt. As the mineral composition depends on the type of parent... 

The immediate physical effects of moisture are most pronounced with fine particulate materials, because these are more variable in density condition and offer wider shear strength changes than coarse particulates. At low... 

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