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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%.
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.
순환잔골재를 사용한 모르타르의 제물성에 관한 실험적 연구
문대중,최재진,Moon, Dae-Joong,Choi, Jae Jin 한국건설순환자원학회 2009 한국건설순환자원학회지 Vol.4 No.1
모재콘크리트의 품질이 각기 다른 순환잔골재의 특성을 모르타르 시험에 의해 비교 고찰하였다. 모재콘크리트 강도가 클수록 밀도가 컸으며, 부착 시멘트페이스트의 공극량이 감소하므로 흡수율은 작게 나타났다. 순환잔골재를 사용한 모르타르의 압축강도 및 휨강도 특성은 신모르타르의 계면영역과 순환잔골재에 부착된 모르타르의 강도에 의해 지배적인 영향을 받으며, 모재콘크리트의 강도가 작을수록 다공성 재료가 되므로 강도발현이 작게 나타났다. 재령 180일에서 순환잔골재를 사용한 모르타르의 건조수축은 약 $1800{\sim}2000{\mu}m/m$ 정도로 천연잔골재를 사용한 모르타르보다 1.5배 정도 크게 나타났는데 이것은 순환잔골재에 부착된 모르타르가 다공성으로 흡수율이 크기 때문에 나타난 결과로 판단된다. 그러나 동결융해시험에서 순환잔골재를 사용한 모르타르의 내구성은 천연골재와 비슷한 수준으로 모재콘크리트의 강도에 의한 영향은 크지 않은 것으로 나타났다. The properties of recycled fine aggregates which had different source concrete were examined by mortar test. With higher strength of source concrete, specific gravity of recycled fine aggregate was higher and absorption of recycled fine aggregate was lower due to reduction of the volume of adhered cement paste. The compressive strength and flexible strength of mortar with recycled fine aggregate were affected by the interface boundary of new mortar and the strength of adhered mortar. Strength development of mortar with recycled fine aggregate reduced because recycled fine aggregate become a porous material with the smaller strength of source concrete. The drying shrinkage of mortar was about$800{\sim}2000{\mu}m/m$. It was about 1.5 times than that of mortar with natural fine aggregate. Relative dynamic modulus of elasticity was a similar level with that of mortar with natural fine aggregate.
재생(再生)잔골재(骨材)를 프리캐스트 콘크리트용(用) 골재(骨材)로 활용(活用)하기 위한 실험적(實驗的) 연구(硏究)
문대중,문한영,김양배,임남웅,Moon, Dae-Joong,Moon, Han-Young,Kim, Yang-Bae,Lim, Nam-Woong 한국자원리싸이클링학회 2006 資源 리싸이클링 Vol.15 No.2
폐콘크리트 파쇄시 발생하는 재생잔골재의 품질을 검토하였으며, 재생잔골재를 활용한 모르타르의 압축강도, 휨강도 및 흡수율을 검토하였다. 또한, 프리캐스트 콘크리트 제품용 골재로서의 적용성에 대하여 평가하였다. 재생잔골재의 밀도 및 흡수율은 각각 $2.31\;g/cm^3$ 및 8.07%로 KS F 2573의 2종에 해당되는 품질이었다. 혼합시멘트 MRS1, MRS2 및 MRS3 사용 모르타르의 재령 28일 압축강도는 물-시멘트비 35%, 양생온도 $40^{\circ}C$의 조건에서 각각 15.8, 27.4 및 48.7MPa로 최대값을 발현하였다. 모르타르의 최대휨강도는 혼합시멘트 MRS1 및 MRS2 사용시 물-시멘트비 35.0%, 양생온도 $40^{\circ}C$, 혼합시멘트 MRS3사용시 물-시멘트비 37.5%, 양생온도 $40^{\circ}C$의 조건에서 발현하였다. 혼합시멘트 MRS1, MRS2 및 MRS3를 사용한 모르타르의 흡수율의 범위는 각각 $8.3{\sim}7.3%,\;6.5{\sim}8.5%$ 및 $3.5{\sim}6%$의 범위로 나타났다. 그러므로 혼합시멘트와 재생잔골재의 비율을 적절히 조절함으로써 MRS1는 저강도용, MRS2는 보통강도용, MRS3는 고강도용으로 다양한 프리캐스트 콘크리트 제품에 적용될 수 있을 것으로 기대된다. The duality of recycled fine aggregate (RS) which was produced at the waste concrete crushing was investigated. The compressive strength, flexural strength and absorption of mortar utilized with RS were examined. It was evaluated on the application of RS as precast concrete aggregate. The density and absorption of RS were $2.31g/cm^3$ and 8.07% respectively, the quality of RS was satisfied with the criterion of KS F 2573 type 2. The maximum 28days compressive strength of mortar mixed with blended cement MRS1, MRS2 and MRS3 were developed with 15.8, 27.4 and 48.7MPa respectively, in condition to curing temperature $40^{\circ}C$ and water-cement ratio 37.5%. When blended cement MRS1 and MRS2 were used, the maximum flexural strength of mortar was developed at curing temperature $40^{\circ}C$ and water-cement ratio 35.0%. When blended cement MRS3 was used, the maximum flexural strength of mortar was developed at curing temperature $40^{\circ}C$ and water-cement ratio 37.5%. The absorption of mortar mixed with blended cement MRS1, MRS2 and MRS3 were indicated the range of $8.3{\sim}7.3%,\;6.5{\sim}8.5%$ and $3.5{\sim}6%$ respectively. Therefore, when the ratio of blended cement and RS is appropriately centre]led, it would be expected that MRS1, MRS2 and MRS3 will be able to apply the variable low strength, medium strength and high strength precaste concrete.