美国建筑骨料年人均消费量达4～8t或更多。由于城市建筑业发展及其它用途的增加(如铺路、铁路路基、废水处理过滤材料等),对建筑骨料的需求日益增长。 有许多地方,原有的建筑骨料来源已被采空,或因区域规划和开发活动而使剩余的建筑骨料来源不能再加以利用。但是,要想继续以合理的成本获得足够的建筑骨 Annual per capita consumption of building aggregates in the United States is 4-8t or more. Due to the growth of urban construction and other uses (such as paving, railway embankment, wastewater treatment and filtration materials, etc.), the demand for building aggregates is increasing. In many places, the original building aggregate source has been taken out of space, or the remaining building aggregate sources can no longer be used due to regional planning and development activities. However, it is necessary to continue to obtain sufficient building bones at a reasonable cost.