시멘트계 재료의 pH 저하 저항성을 이용한 콘크리트 배합의 골재량 예측 = Estimation of aggregate content in a concrete mix using the resistance to a pH reduction in cementitious materials

다국어 초록 (Multilingual Abstract)

For identifying aggregate content in a concrete mix design, cement paste, mortar and concrete at 30% of water-cement ratio were cast in looking into the buffering capacity of cement matrixes to a pH fall. The resistance to a pH fall of suspension, consisting of powder sample and still water, was quantified after 200 days curing by assessing the buffering capacity against nitric acid. The pH of suspension gradually decreased as the amount of nitric acid increased, in particular, at 10 in the pH, a sharp decrease was observed. It was found that the acid concentration at 10 in the pH was dependent on aggregate content of mortar and concrete. The correlation of this results can fingerprint a concrete mix design about aggregate content.