Abstract:
The present invention relates to a method for manufacturing recycled aggregates, wherein said recycled aggregates are manufactured using a reaction of rapid carbonation to achieve significantly reduced absorption and increased density, which satisfy the quality standards of recycled aggregates. As opposed to conventional strong alkaline recycled aggregates, the recycled aggregates of the present invention have a low pH level, and thus minimize alkali-aggregate reactions and drying shrinkage when used in concrete, and minimize the influences on soil, on a marine environment, and on an ecosystem.
Abstract:
PURPOSE: An apparatus for neutralizing recycled aggregate using a promoted neutralization reaction and a method thereof are provided to reduce a neutralization reaction period by accelerating the neutralization reaction. CONSTITUTION: An apparatus(100) for neutralizing recycled aggregate using a promoted neutralization reaction comprises a container body(111), a fluid supply pipe(115), an input body, a discharge body, an agitating device(120), a gas supply device(140), and a dehydrating device(150). The container body includes an inlet, a neutralization space, and an outlet(114). The fluid supply pipe is connected with a side of the container body. The input body is arranged on a side of the container body. The discharge body opens and closes the outlet. The agitating device is installed at the container body. The supply device is connected with the neutralization space to supply carbon dioxide. The agitating device includes an agitating pipe, an agitating screw, and an agitating motor.
Abstract:
PURPOSE: Recycled aggregate for concrete using environment-friendly rapid carbonation reaction is provided to show similar dry shrinkage to that of common concrete made of natural aggregates. CONSTITUTION: Recycled aggregates for concrete have 3.1-8% of absorption rate. The recycled aggregates for concrete have absolute density of 2.2~2.49 g/cm^3. The recycled aggregates for concrete have pH of 11-12.5 and the size of 5-25mm. A method for producing high-density neutral recycled aggregates for concrete comprises the step of performing rapid carbonation reaction through which aggregate reacts to carbon dioxide in a closed chamber in order to neutralize Ca(OH)2 in mortar included in recycled aggregate more than 70%. Owing to the production method, the absorption rate of the produced recycled aggregate is dropped to 1.5-3.0%, and absolute density is increased to 2.5~4.0g/cm^3, and pH is decreased to 7.5-10.
Abstract translation:目的:提供使用环保快速碳酸化反应的混凝土回收骨料,以显示与天然骨料制成的普通混凝土相似的干缩率。 构成:混凝土的回收总量为吸收率的3.1-8%。 混凝土的再生骨料的绝对密度为2.2〜2.49 g / cm ^ 3。 混凝土的回收骨料的pH值为11-12.5,尺寸为5-25mm。 用于生产混凝土的高密度中性再循环骨料的方法包括进行快速碳酸化反应的步骤,通过该方法,聚集体在封闭的室中与二氧化碳反应,以便中和包含在再循环骨料中的砂浆中的Ca(OH)2超过70% 。 由于制造方法,所生产的再生骨料的吸收率降低至1.5-3.0%,绝对密度提高至2.5〜4.0g / cm 3,pH降至7.5-10。
Abstract:
PURPOSE: A neutralizing apparatus of recycled aggregate using a promoting neutralization reaction and a method thereof are provided to expand availability of carbon dioxide by storing carbon dioxide to calcium carbonate in the recycled aggregate. CONSTITUTION: A neutralizing apparatus(100) of recycled aggregate using a promoting neutralization reaction includes a chamber body(111), an input opening body(114), a discharge opening body(116), a stirring device(120), and a gas supply device(140). The chamber body includes a neutralization space, an inlet, and an outlet. The recycled aggregate is received in the neutralization space. The recycled aggregate is put into the inlet. The recycled aggregate is discharged to the outlet. The input opening body is arranged on a side of the inlet. The stirring device is installed at the chamber body. The gas supply device is connected with a side of the chamber body. The stirring device includes a stirring pipe, a stirring screw, and a stirring motor.
Abstract:
PURPOSE: A neutralizing apparatus of recycled aggregate using a promoting neutralization reaction and a method thereof are provided to improve productivity by promoting a neutralization reaction while penetrating carbonated water into the recycled aggregate. CONSTITUTION: A neutralizing apparatus(100) of recycled aggregate using a promoting neutralization reaction includes a chamber body(111), an input body(114), a discharge body, an agitating device(120), a carbonated water molecular device(140), and a dehydration device(150). The chamber body includes an inlet, a neutralization space, and an outlet. The input body is arranged on a side of the chamber body. The discharge body is arranged on the other side of the chamber body. The agitating device is installed at the chamber body. The carbonated water molecular device is connected with a side of the chamber body. The dehydration device connected with the outlet dehydrates the recycled aggregate.