抄録
The severe problem of the disposal of various wastes continue to increase, one of which is waste concrete. In relation to global warming, reducing the generation and fixation of CO2 gas must also be solved. This paper experimentally examines an efficient recycling system to reuse the sand in waste concrete whose mean size is about 0.3mm. We found that the liquation of Ca2+ with waste concrete in a hydrochloric acid water solution of pH≈2.5 is optimum. Next, we show a new efficient CO2 gas fixation method by the reaction of carbonic acid with a micro bubble CO2 gas jet flow. Finally, a new process system to efficiently recycle waste concrete and to improve CO2 fixation and its performance is examined.
