Method and apparatus for producing concrete
专利汇可以提供Method and apparatus for producing concrete专利检索，专利查询，专利分析的服务。并且PURPOSE:To lower the temperature at kneading completion of concrete and consequently increase its strength and reduce the development of crazing by a method wherein the surface water of aggregate is frozen by cooling the aggregate while stirring in order to form ice layer on the surface of the aggregate in advance before mixing respective constitutional materials one another. CONSTITUTION:After sand 3 is charged in a drum 14, a motor 22 is driven so as to move the scrapers 20, 20,... in the drum 14 circularly in a mixer 12 in order to stir the sand 3 in the drum 14. And, while the sand 3 is being stirred, liquefied gas or the like is blown out inward at the bottom of the drum 14 in order to directly blast against the bottom of the sand 3 by supplying the liquefied gas or the like from a tank 24 through a supply pipe 26 to blasting nozzles 27, 27,... by means of a control device 25. Thus, the sand 3 is instantaneously cooled down below zero, resulting in freezing the surface water of the sand 3 so as to form ice layer on the surface of the sand 3. After that, the low temperature sand 3, gravel 4 cement and water or fine ice particles are mixed with one another and, in addition, various intimate mixing agents are mixed to them in order to manufacture concrete.，下面是Method and apparatus for producing concrete专利的具体信息内容。
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