Particle size composition characteristics of weathered debris from grey-green slate under the action of freeze-thaw and dry-wet cycles.

The material basis for soil formation is rock weathering debris. Understanding the particle size composition characteristics of rock weathering debris and its impacts is important for improving the soil structure of dry farmland in the central dry zone of Ningxia,China. In this study, the particle sizes of weathered debris collected from grey-green slate after indoor simulations of freeze-thaw and dry-wet cycles tests were examined.