Product description of "nano materials for hb7-2 shotcrete" nano materials for hb7-2 shotcrete have passed a large number of indoor and field spraying tests on the basis of a large number of construction experience of wet spraying, wet spraying and dry spraying concrete, aiming at the problems of high rebound rate, long setting time, reduced later strength and high amount of cementitious materials of shotcrete, Developed functional products. Under the same water binder ratio and the same accelerator dosage, compared with the conventional shotcrete, the shotcrete mixed with this product can improve the cohesion and sprayability, greatly reduce the rebound rate, shorten the setting time, and significantly improve the early and late strength. This product is suitable for underground support of water conservancy and hydropower, transportation, railway, municipal and civil defense projects.