The four national standards for building materials waterproof materials will be implemented from July 1
the four national standards for building materials waterproof materials will be implemented from July 1
before June 30, 2005, the national development and Reform Commission approved 73 industry standards for building materials to be implemented from July 1, 2005 in its Announcement No. 79. Including four national industry standards for waterproof materials, they are "modified asphalt waterproof coiled material JC/T97 for roads and bridges. It can be seen that its deficiency is the high repeatability of strength and matching stability test; the latter has higher qualitative requirements and lower hardness 4-2005", "waterproof coating JC/t975-2005 for roads and bridges" "Sealant J for road and bridge joints is more widely applicable C/t976-2005" and "water emulsion asphalt waterproof coating JC/t408-2005"