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Carbon Black이 시멘트 Paste 및 Mortar의 물리적 특성에 미치는 영향
홍원표,황의환,조헌영 忠南大學校 産業技術硏究所 1986 산업기술연구논문집 Vol.1 No.2
This study was performed to determine the most desirable carbon black and it's content in ordinary porland cement for the increase of physical properties of the cement and mortar. The various contents of carbon black were used for this study such as 0.2wt%, 0.5wt%, 1.0wt% and 3.0wt%. The different particle size and structure of carbon black were used. The physical properties of the cement paste and mortar were tested by KS methods. The experimental results are as follow; 1) The contents of 0.5-1.0wt% carbon blacks in cement increased most apparently the setting time of cement paste, flow value, compressive and flexural strengths of mortar, whereas decreased the water absorption ratio of mortar by about 10%. 2) SNP and D company's carbon black which have smaller numbers of I₂adsorption and DBP absorption and heavier pour density than those of others showed to be the most effective carbon blacks. 3) The soundness of cements remained unchanged regardless to the different kinds and contents of carbon blacks.
Aluminum Isoproxide의 합성과 그 Sol의 특성
홍성수,이환홍,노재성,조헌영 忠南大學校 産業技術硏究所 1991 산업기술연구논문집 Vol.6 No.2
Aluminum isoproxide was synthesized by aluminum and isoproplyl alcohol and hydrolyzed to make alumina sol. The collodial stability of alumina sol was evaluated by measuring zeta potential. A high purity aluminum isoproxide(>99%) was obtained from aluminum powder, foil and flake. The particle size of aluminum powder was smaller than 250㎛ to obtain 80% yield and up within 6 hours reaction time. The alumina sol was highly stabilized in the presence of acid medium at a hydrolysis condition of pH 3 and water/alkoxide=150 at 65℃. The particle size of alumina powder was mostly under l㎛ after sintering at 1200℃ for 1 hours.
나프탈렌슬폰산 축합물계와 말레인산 공중합체계 콘크리트용 유동화제가 첨가된 시멘트 현탁용액의 거동
노재성,류호석,조헌영 忠南大學校 産業技術硏究所 1994 산업기술연구논문집 Vol.9 No.1
The behavior of adsorption, the variations of zeta potential, the behavior of sedimentation in the cement suspensions added with Naphthalene Sulfonated Formaldehyde Condensate (β-NSF) and Maleic Anhydride Copolymer (MA) were investigated. Also the variations of mini slump, the time evolutions of mini slump and the setting times of the cement pastes fluidity with β-NSF and MA were tested. From this research, it is cleared that β-NSF has a strong effect on the fluidized of the cement paste and MA affects to keep the fluidity of the paste for a long time.
개질된 Fly Ash를 혼합한 Flyash 시멘트 모르터의 특성
조헌영,홍원표,Cho Heon-Young,Hong Won- Pyo 한국시멘트협회 1990 시멘트 심포지움 Vol.18 No.-
For the development of multi-functional materials which has water reducing power, air entraining power and waterproofing power as well as a blending additive in cement mortar the low grade fly ash was modified with asphalt-stearic acid or asphalt-boiled o
ASPHALT 와 CARBON BLACK 으로 처리된 고재구성 포틀랜드시멘트의 수화특성
조헌영,김희락,홍원표 ( Heon Young Cho,Hee Rack Kim,Won Pyo Hong ) 한국공업화학회 1992 공업화학 Vol.3 No.1
콘크리트의 내구성을 향상시키는 기존의 공법과는 다르게, 시멘트 입자 표면에 아스팔트 膜을 부분적으로 형성시킨 후 카본블랙을 處理하여 콘크리트의 전반적인 耐久性을 현격히 향상시킨 高耐久性 포틀랜드시멘트(ACTPC)의 水和反應 特性을 X-Ray, SEM, 전도열량계 등을 사용하여 조사한 결과는 다음과 같다. ACTPC가 물과 접촉하면 발수성을 나타내는 아스팔트 膜은 시멘트 粒子와 물의 접촉 및 시멘트 粒子로부터 각종 이온들의 溶出을 방해하여 初期 水和反應이 억제되지만, 카본블랙은 결정핵 역할을 하므로 일정기간이후 의 水和反應을 촉진한다. For the enhancement of the concrete durability, we developed high - durable portland cement (ACTPC) by physical treatment of ordinary portland cement with asphalt and carbon black. In this research, the hydration reaction characteristics of ACTPC were studied by using SEM, X-Ray, Conduction Micro Calolimeter etc. When the ACTPC is mixed with water, it is believed the asphalt films on cement particles suppress the early stage of hydration reactions of cements, because the films hinder the contact with water and the elusion of soluble ions from particles. But the carbon blacks on the cement particles accelerated the hydration reactions of cement after a while, because the micro particles can be used as seed crystals in CaO-SiO_2-H_2O gel formation.