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据日本东和产业株式会社社长介绍,日本筱业厅研究所研制的膨胀水泥(BRISTAR),主要用于人口密集的城市拆除旧建筑物、构筑物或岩石。这种水泥破坏力很大,为每平方米3000吨,无声,又称安静炸药。目前,共有四种标号100~#、150~#、200~#和300~#。冬季在5℃以下使用300~#。爆破不太硬的钢筋混凝土或岩石,每立方米用水泥5至7公斤,较硬的用7至10公斤,坚硬的用10至13公斤。根据设计要求,在要拆除的钢筋混凝土或岩石上钻孔,孔径一般为38至42毫米,冬季孔径
According to the president of Japan’s Toho Industries Co., Ltd., the BRISTAR developed by the Japan Research Institute for Debris is mainly used for demolishing old buildings, structures or rocks in densely populated cities. This cement has a great destructive power of 3,000 tons per square meter and is silent, also known as quiet explosives. At present, there are four types of numbers: 100~#, 150~#, 200~#, and 300~#. In winter use 300~# below 5°C. For reinforced concrete or rock that is not hard to blast, use 5 to 7 kilograms of cement per cubic meter, 7 to 10 kilograms of harder, and 10 to 13 kilograms of harder. According to the design requirements, drilling holes in reinforced concrete or rock to be demolished, the hole diameter is generally 38 to 42 mm, and the hole diameter in winter