Polycarboxylate계 계면활성제(PC)는 콘크리트 혼화제로 기존 리그닌 설폰네이트, 멜라민 설폰네이트, 나프탈렌 설폰네이트계 혼화제에 비해 초유동성 및 감수효과에 탁월한 성능을 나타내는 것으로 알려져 있다. 이러한 PC는 일반적으로 MPEG(Methoxy polyethlene glycol)와 MA(Methacrylacid)의 수용액상에서 ...
Polycarboxylate계 계면활성제(PC)는 콘크리트 혼화제로 기존 리그닌 설폰네이트, 멜라민 설폰네이트, 나프탈렌 설폰네이트계 혼화제에 비해 초유동성 및 감수효과에 탁월한 성능을 나타내는 것으로 알려져 있다. 이러한 PC는 일반적으로 MPEG(Methoxy polyethlene glycol)와 MA(Methacrylacid)의 수용액상에서 공중합에 의해 제조되고 있다. 본 연구에서는 MPEG 및 MA 종류, MA 첨가량, 개시제 종류 및 양에 따른 그래프트 공중합실험을 실시하였으며, 얻어진 각 PC를 시멘트 입자의 분산에 미치는 영향을 조사하였다. 분산성을 검토하기 위하여 PC의 표면장력 및 Wesburn Equation method에 의한 시멘트 입자와의 접촉각을 측정하였다. 몰탈(시멘트:모래=1:1)에 일정량의 PC를 첨가하고 Consistency를 측정하여 시멘트 분산성을 측정하였다. MA 첨가량 및 개시제의 종류, MPEG종류에 대해 시멘트 분산효과가 최대치를 갖는 최적의 값이 존재하는걸 알 수 있었다.
Polycarboxylate계 계면활성제(PC)는 콘크리트 혼화제로 기존 리그닌 설폰네이트, 멜라민 설폰네이트, 나프탈렌 설폰네이트계 혼화제에 비해 초유동성 및 감수효과에 탁월한 성능을 나타내는 것으로 알려져 있다. 이러한 PC는 일반적으로 MPEG(Methoxy polyethlene glycol)와 MA(Methacrylacid)의 수용액상에서 공중합에 의해 제조되고 있다. 본 연구에서는 MPEG 및 MA 종류, MA 첨가량, 개시제 종류 및 양에 따른 그래프트 공중합실험을 실시하였으며, 얻어진 각 PC를 시멘트 입자의 분산에 미치는 영향을 조사하였다. 분산성을 검토하기 위하여 PC의 표면장력 및 Wesburn Equation method에 의한 시멘트 입자와의 접촉각을 측정하였다. 몰탈(시멘트:모래=1:1)에 일정량의 PC를 첨가하고 Consistency를 측정하여 시멘트 분산성을 측정하였다. MA 첨가량 및 개시제의 종류, MPEG종류에 대해 시멘트 분산효과가 최대치를 갖는 최적의 값이 존재하는걸 알 수 있었다.
Polycarboxylate surface active agent(PC) is known as an excellent concrete admixture for the concrete having a relatively good hardness and durability having a super-fluidity and water reduction ability compared to the existing lignosulfonate, melaminesulfonate, naphthalenesulfonate. Usually, the PC...
Polycarboxylate surface active agent(PC) is known as an excellent concrete admixture for the concrete having a relatively good hardness and durability having a super-fluidity and water reduction ability compared to the existing lignosulfonate, melaminesulfonate, naphthalenesulfonate. Usually, the PC is made by co-polymerization of MPEG (Methoxy polyethlene glycol) and MA (Methacrylacid) in aqueous solution. This paper investigated the effects of MPEG and MA types, the MA addition amount, initiator type, and a graft co-polymerization conditions on the PC performance including the dispersion stability of the cement particle. To do such research, contact angle between the cement particle and water in the presecce of PC was measured. Also, it is related to surface tension of the aqueous solution existing PC and molecular weight and the adsorption amount per cement unit mass. Wesburn method was applied to measure the contact angle to study the dispersion effect. This paper investigated the colloidal stability of the cements particles in the surfactant solutions. Electronic and steric stability was considered which would be an main factors to control the colloidal stability. To study the electrostatic stability mechanism, the zeta-potential was measured by electro-osmotic analysis. Also, to study the steric and hydration force mechanism in the colloidal stability, the contact angle between the cement surface and aqueous phase including various surfactants were investigated. It was found that the cement colloidal particles was stable, the concrete was formed firmly having good performance including a good workability and reduced water. In this study an optimum condition having the most suitable cement dispersion and concrete performance was obtained which is varied with the MA amount and MPEG types. The PC made at the optimum condition reveled a good concrete properties.
Polycarboxylate surface active agent(PC) is known as an excellent concrete admixture for the concrete having a relatively good hardness and durability having a super-fluidity and water reduction ability compared to the existing lignosulfonate, melaminesulfonate, naphthalenesulfonate. Usually, the PC is made by co-polymerization of MPEG (Methoxy polyethlene glycol) and MA (Methacrylacid) in aqueous solution. This paper investigated the effects of MPEG and MA types, the MA addition amount, initiator type, and a graft co-polymerization conditions on the PC performance including the dispersion stability of the cement particle. To do such research, contact angle between the cement particle and water in the presecce of PC was measured. Also, it is related to surface tension of the aqueous solution existing PC and molecular weight and the adsorption amount per cement unit mass. Wesburn method was applied to measure the contact angle to study the dispersion effect. This paper investigated the colloidal stability of the cements particles in the surfactant solutions. Electronic and steric stability was considered which would be an main factors to control the colloidal stability. To study the electrostatic stability mechanism, the zeta-potential was measured by electro-osmotic analysis. Also, to study the steric and hydration force mechanism in the colloidal stability, the contact angle between the cement surface and aqueous phase including various surfactants were investigated. It was found that the cement colloidal particles was stable, the concrete was formed firmly having good performance including a good workability and reduced water. In this study an optimum condition having the most suitable cement dispersion and concrete performance was obtained which is varied with the MA amount and MPEG types. The PC made at the optimum condition reveled a good concrete properties.
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