Weathered sand is the intermediate product of weathering process of ground rock stratum, and its durability is worse than that of ordinary soil materials, and its physical and mechanical properties are unstable. Weathered sand is characterized by angular particles, weak strength, non-uniform size distribution and a large amount of fine soil particles. Weathered sand producing areas: Bailian River (fine granite), Yahekou (granite gneiss, diorite gneiss), Dahuofang (granite, granite gneiss), three Gorges (biotite quartz diorite) Jiusongshan (hornblende granite gneiss), Langang (sandstone). The investigation shows that there are a large number of weathered sand along the highway from Shaolin Temple to Luoyang. The physical and mechanical properties of weathered sand and various road properties of cement stabilized weathered sand are studied. Cement stabilized weathered sand has good mechanical properties and broad application prospects.
The treatment method of weathered sand is to crush the weathered sand, so that the weathered sand with poor density can be refined and crushed under the action of exciting force, and then wash with water to remove trace stone powder and impurities from the sand, reduce the mud content in the sand, purify the sand gravel content, and finally get the sand that meets the building requirements. Using weathered sand with rich resources as raw materials, it has the characteristics of convenient material extraction, low cost, turning waste into treasure, reasonable process and feasible technology. The weathered sand production line is mainly composed of jaw crusher, weathered sand making machine (weathered stone sand making machine), vibrating screen, sand washing machine and belt conveyor. The process of weathering sand production line: first, the rock is initially broken by coarse jaw crusher, and then the resulting coarse material is transported by belt conveyor to fine crusher and crushing, and the finely crushed stone goes into vibrating screen to separate two kinds of materials. the stone that meets the feed size of sand making machine enters the weathering sand making machine to make sand, and the other part is returned into fine crusher again. Part of the stone into the weathering sand making machine is made into sand, which is washed by the sand washing machine to make the finished weathered sand, and the other part of inlet sand making machine is broken again.
Weathered sand is mostly granite gneiss and diorite gneiss. After explosive excavation and transport, this strongly weathered gneiss becomes loose weathered stone slag or foam. Weathered sand has strong water resistance and can be used as building sand. The consolidation of weathered sand is also fast and can be used as a good permeable material or semi-permeable material.
