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문대중,문한영,김양배 한국콘크리트학회 2004 콘크리트학회논문집 Vol.16 No.6
The quality of recycled aggregate is affected by original concrete strength and the manufacturing process of recycled aggregates. In this study, the porosity of old and new mortar, and the compressive strength of concrete were investigated to examine the influence of recycled aggregate on the concrete. Six kinds of recycled coarse aggregates were produced from concrete blocks of differing strength levels (A:60.1MPa, B:41.7MPa, C:25.5MPa).Original concrete strength and the bond mortar of recycled aggregate influences the pore structures of both old and new mortar. The pore size distribution of old mortar was found to be greatly affected by age, and the reduction of the porosity of bond mortar on low strength recycled aggregate increased at a greater rate than that of bond mortar on high strength recycled aggregate. The pore size distribution of new mortar in recycled aggregate concrete changed in comparison with that of new mortar in virgin aggregate concrete. The total porosity of new mortar using B level recycled aggregates was smaller than that of new mortar with A, and C level recycled aggregates. Moreover, the compressive strength of recycled aggregate concrete was found to have been affected by original concrete strength. The compressive strength of concrete only changed slightly in the porosity of new mortar over 15%, but increased rapidly in the porosity of new mortar fewer than 15%.
시멘트풀 속에서의 순환굵은골재 부착모르타르의 성상변화에 관한 연구
문대중,최재진,Moon, Dae-Joong,Choi, Jae-Jin 한국건설순환자원학회 2011 한국건설순환자원학회지 Vol.6 No.1
순환굵은골재 콘크리트에서 혼합전의 순환굵은골재에 부착되어 있었던 모르타르의 성상변화를 조사하기 위한 방법으로, 시멘트풀 속에 순환굵은골재를 투입하여 경화시킨 다음 순환굵은골재에 부착된 모르타르의 비캇경도와 공극분포를 검토하였다. 이때 순환굵은골재는 모재콘크리트의 압축강도를 3수준(25.5MPa, 41.7MPa, 60.1MPa)으로 변화시켜 제조한 것을 파쇄시킨 다음 표면건조포화상태 및 절대건조상태에서 사용되었다. 실험결과 순환굵은골재에 부착된 모르타르의 비캇경도는 순환굵은골재의 모재콘크리트의 강도가 클수록 크며, 재령이 증가할수록 크게 되는 것으로 나타났다. 또한, 시멘트풀 속에서 부착모르타르의 공극분포는 $100nm{\sim}10{\mu}m$ 크기의 공극이 감소되며, 6nm~100nm 크기의 작은 공극이 증가하는 것으로 나타났다. Vicker's hardness and pore size distribution of mortar adhered to the recycled coarse aggregate were tested according to the strength level of original concrete of recycled coarse aggregate to find the change of mortar adhered to the recycled coarse aggregate in cement paste. The strength levels of original concrete of recycled coarse aggregate were 25.5MPa, 41.7MPa and 60.1MPa and the aggregates were used at the state of saturated surface dry condition and oven dry condition. The results of this experimentation indicated that the mean value of Vicker's hardness was increased according to age and strength of original concrete of recycled aggregate. Porosity of $100nm{\sim}10{\mu}m$ size was reduced and porosity of 6nm~100nm size was increased in cement paste.
문대중,정문영,최윤왕 한국자원공학회 2003 한국자원공학회지 Vol.40 No.6
폐콘크리트 분말은 강열감량과 불용해 성분이 50% 이상이었으며, 이를 제외한 화학성분 구성비율은 시멘트와 유사하였으나, 내부공극은 모재콘크리트의 강도에 따라 차이가 있었으며, 4∼20㎛ 범위의 공극을 갖는 다공성 분포를 나타내었다. 폐콘크리트 분말은 다공성재료로 혼합수를 흡수하게 되므로 혼합률이 증가할수록 모르타르의 플로우값을 감소시켰으나, 공기량에는 영향을 미치지 않았다. 폐콘크리트 분말 사용 모르타르의 재령 7일에 대한 28일 압축강도비 및 휨강도비는 각각 36∼55% 및 22∼34%로 보통포틀랜드시멘트만을 사용한 모르타르에 비하여 재령에 따른 강도비가 증가하였다. 폐콘크리트 분말 사용 모르타르의 재령 28일 압축강도 및 휨강도는 혼합률이 증가할수록 보통포틀랜드시멘트만을 사용한 모르타르에 비하여 직선적으로 약 14∼33% 감소하였으나, 모재콘크리트의 강도증가에 따른 영향은 없었다. Loss of ignition and insoluble components of concrete dust waste(CDW) were above 50%, to except those the chemical composition ratio of CDW was similar to that of normal portland cement(NPC). However, internal pore volume of CDW varied depending on the compressive strength of matrix concrete, and most of its pore diameter existed in the range of 4∼20㎛. CDW reduced the flow value of mortar with increasing replacement ratio because absorbing the mixing water due to porosity, but it did not affects the air content of moratr. The 28days compressive and flexural strength ratio of mortar with CDW depending on the age of 7days were 36∼55% and 22∼34% respectively, and increased higher than that of mortar with NPC. The 28days compressive and flexural strength of mortar with CDW was linearly decreased about 14∼33% with increasing replacement ratio compared to that of mortar with NPC, but it did not affected by the strength of matrix concrete.