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(日本经济新闻1979年9月3日报导)日本利布肯工程与日本铁道建设公司青函建设局研制成功制造优质混凝土的新方法。该方法用的水泥量不变,而提高混凝土强度达30％。该方法是出于利用制得的具有造壳结构的水泥浆壳颗粒,而得到优良性能的混凝土的想法而进行研究的。其具体作法是将砂子加到特制的砂控制器装置中,予先使砂的含水率固定,然后制造以这种砂,为核心的水泥浆壳,再加碎石和水制成混粘土。这种水
(Nihon Keizai Shimbun, September 3, 1979) Japan Liebgen Engineering and Japan Railway Construction Corporation Seikan Construction Bureau developed a new method for producing high-quality concrete. The method uses the same amount of cement and increases the concrete strength by 30%. This method was studied based on the idea of obtaining concrete with excellent properties, using the obtained cement shell particles having a shell structure. The specific method is to add sand to a special sand controller device, preliminarily fixing the moisture content of the sand, and then making the cement mortar shell with the sand as the core, and then adding gravel and water to make the mixed clay. This kind of water