However, high-quality aggregate is expensive, and thus, economically unviable in countries where natural aggregate is cheaply obtained.
Lack of natural stone and costly expense of purchasing high-quality aggregate promote the utilization of steel slag.
For many years, Stanley's company bought large quantities of high-quality aggregate from a dredging operation off the southern end of Staten Island, not far from an entrance to New York Harbor, but that operation was shut down in 2015, amid concerns that the dredges were doing environmental damage to the seafloor.
Typically, there are selected high quality aggregates for asphalt wearing layer of heavy duty pavement.
Ungraded aggregates such as gneiss are therefore considered in China to replace the high quality aggregates.
Rapid developing of asphalt pavement construction results in the lack of high quality aggregates and environmental damage.
One the other hand, high quality aggregates, such as limestone and basalt, are running out due to the rapid development of highway construction.
Therefore, using ( Coverline{S} A ) cement and marginal aggregates for concrete in a freeze thaw environment may prove less expensive than portland cement concrete and higher quality aggregates.
It is built using a high quality aggregate containing very few or no-fines [72].
Choi et al. (2014a, b) conducted a study on surface modification (Noguchi and Tamura 2001; Tsujino et al. 2010, 2011) through the use of an inorganic material on crushed stone aggregates; they reported its effect on improving the mechanical characteristics of crushed stone aggregates and recovering high-quality recycled aggregates.
CARLSBAD is a database focused on high-quality subsets aggregated from several bioactivity databases, which are integrated in a uniform interface and manner, suitable for chemical biology and drug discovery studies, as well as large scale, 'big data' informatics and knowledge mining.
