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    • 8. 发明授权
    • Expansive material and its preparation process
    • 膨胀材料及其制备工艺
    • US08663383B2
    • 2014-03-04
    • US13261027
    • 2010-05-20
    • Takayuki HiguchiTaiichiro MoriHideaki IshidaRyoetsu YoshinoMinoru Morioka
    • Takayuki HiguchiTaiichiro MoriHideaki IshidaRyoetsu YoshinoMinoru Morioka
    • C04B2/02
    • C04B40/0039C04B38/02Y02P40/18C04B7/02C04B22/064C04B22/143C04B40/0082C04B40/0231
    • The invention provides an expansive material that allows for large expansion of concrete at a material age of 2 to 7 days after pouring and permits concrete to have higher initial compressive strength and makes sure good storage stability, and a process for preparing that expansive material.The invention provides an expansive material and a process for preparing that expansive material, characterized in that clinker or pulverized clinker containing free lime, a hydraulic compound and calcium sulfate anhydrite is heat treated in a carbon dioxide gas atmosphere to form calcium carbonate in it. Preferably, the expansive material contains a particle in which the free lime, hydraulic compound, calcium sulfate anhydrite and calcium carbonate are all present; the content of calcium carbonate is 0.5 to 10% by mass; and the expansive material has a Blaine's specific surface area of 1,500 to 90,000 cm2/g. The expansive material is blended with cement into a cement composition. The preparation conditions are preferably a carbon dioxide gas flow rate of 0.01 to 0.1 L/min. and a temperature of 200 to 800° C., under which conditions there is calcium carbonate formed.
    • 本发明提供了一种膨胀材料,其允许混凝土在浇筑后2至7天的时间内大量膨胀,并允许混凝土具有较高的初始抗压强度并确保良好的储存稳定性,以及制备该膨胀材料的方法。 本发明提供了一种膨胀材料和一种制备膨胀材料的方法,其特征在于,在二氧化碳气氛中对含有游离石灰的熟料或粉碎熟料,水硬性化合物和硫酸钙无水石膏进行热处理,以形成碳酸钙。 优选地,膨胀材料包含其中存在游离石灰,水硬性化合物,硬脂酸钙和碳酸钙的颗粒; 碳酸钙的含量为0.5〜10质量% 膨胀材料的Blaine比表面积为1500〜90,000cm2 / g。 膨胀材料与水泥混合成水泥组合物。 制备条件优选为0.01〜0.1L / min的二氧化碳气体流量。 温度为200〜800℃,在此条件下形成碳酸钙。