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解放初期粮仓建筑工程系采用杉木板做地板、护壁。每百万斤仓容需木材近百m~3,不但耗资大,且易腐烂,耐久性差。50年代后期学习苏联用沥青作防潮材料,但存在着施工难度大,防潮质量难控制,特别是沥青中含有致癌物质——3、4苯并蓖,对粮食有污染,影响粮食的储藏功能和效果,影响人体健康。安徽省庐江水泥厂生产的明矾石膨胀剂(EA—L)是我国一种新型的膨胀材料,自由膨胀率为0.05～0.10%,自应力值为0.2～0.7MPa(混凝土按水泥用量外掺20%,砂浆按水泥用量内掺15%)。
In the early days of the liberation, the granary construction project used fir boards as floors and walls. Each million pounds of storage capacity requires nearly 100m~3 wood, which is not only expensive but also perishable and has poor durability. In the late 1950s, Soviet Union learned to use asphalt as a moisture-proof material, but there are difficulties in construction, and it is difficult to control the quality of moisture-proof. In particular, bitumen contains carcinogenic substances—3,4 benzopyrene, which pollutes food and affects the storage function of grain. The effect affects human health. The alum-expanding agent (EA-L) produced by Minjiang Cement Plant in Anhui Province is a new type of intumescent material in China, with a free expansion rate of 0.05 to 0.10% and a self-stress value of 0.2 to 0.7 MPa (20 concrete mixed with cement. %, Mortar is blended with 15% cement.