The crystalline blockage of tunnel drainage pipes poses a common challenge to tunnel engineering. particularly in regions with abundant groundwater and severe ion erosion. Based on the design of concrete mix proportion. this paper improves the calcium ion erosion resistance of shotcrete by adding permeable crystalline sodium methyl silicate waterproofing agent and silane waterproofing... https://www.jmannino.com/limited-deal-2nd-Force-Reconnaissance-Company-Patch-super-offer/