The drain pipe jointingmaterial of cement mortar with addition of water glass can effectively overcome the influence of groundwater and improve the quality of the joints.
在水泥砂浆中掺入水玻璃作为排水管的接口材料，能有效克服地下水影响，提高了接口工程质量。
2
The accumulation of dry material increased with the increasing of ATNF during jointing and heading stage, furthermore Indica were higher than Japonica.