• Title, Summary, Keyword: SMF-type superplasticizer

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Synthesis and Application of Melamine-Type Superplasticizer at the Different Synthetic Conditions (멜라민계 고유동화제의 다양한 조건에서의 합성 및 응용)

  • Yoon Sung-Won;Shin Kyoung-Ho;Rho Jae-Seong
    • Journal of the Korea Concrete Institute
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    • v.17 no.5
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    • pp.811-818
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    • 2005
  • It is well known that the fluidity and the fluidity loss of fresh concrete are affected by the kind of organic admixtures. Organic admixture can improve the properties of concrete. Sulfonated Naphthalene-Formaldehyde(SNF) Superplasticizer is used representatively, but has a problem in fluidity loss. In this study, we synthesized the Sulfonated Melamine-Formaldehyde(SMF) superplasticizer at the various synthetic conditions and compared the physical properties with SMF superplasticizer. SW superplasticizer is synthesized with four synthetic steps. Step 1 is hydroxymethylation, Step. 2 is Sulfonation, Step. 3 is Polymerization and Step. 4 is Stabilization. Synthesis of SMF superplasticizer depends on pH, temperature and reaction time. In this reaction, we changed the mole ratio of melamine to formaldehyde at 1:3, 1:4, and the amount of acid catalyst at Step. 3. After application of SMF superplasticizer and its mixture with SNF superplasticizer to cement pastes and mortars, we measured the physical properties of them at the different dosages(0.5, 1.0, 1.5 wt%) to cement. All samples including superplasticizer showed higher compressive strengths and slump, smaller pore size and porosity than CEM

The Physical Properties of Cement Containing Melamine-type Superplasticizer obtained Various Synthetic Conditions (다양한 합성조건에서 얻어진 멜라민계 고유동화제가 함유된 시멘트의 물리적 특성)

  • Yoon, Sung-Won;Shin, Kyoung-Ho
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.415-418
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    • 2005
  • Nowadays the three major commercially available of organic chemical admixtures are modified lignosulfonates(LS), sulfonated naphthalene-formaldehyde resins (SNF) and sulfonated melamine-formaldehye (SMF). In this study, various sulfonated melamine-formaldehyde (SMF) superplasticizers were synthesized via four synthetic steps. Hydroxymethylation (Step 1), Sulfonation (Step 2), Polymerization (Step 3) and Neutralization and Stabilization (Step 4). In this synthesis of SMF, reaction conditions such as the mole ratio of melamine to formaldehyde and the amount of acid catalyst were changed. After application of SMF superplasticizer to cement paste and mortar, the physical properties including workability, slump loss, compressive strength were compared.

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The Physical Fluidity Properties of Concrete Containing Melamine and Naphthalene-type Superplasticizer (멜라민계 및 나프탈렌계 고유동화제가 함유된 콘크리트의 물리적 유동특성)

  • Yoon, Sung-Won;Choi, Byoung-Wook
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.457-460
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    • 2008
  • It was predicted that the most recent technological developments in concrete technology rely on enhanced admixture efficiency rather than on improvement in cement manufacturing. Four major commercially available of organic chemical admixtures are modified lignosulfonates (LS), sulfonated naphthalene-formaldehyde resins (SNF), sulfonated melamine-formaldehyde resins(SMF) and polycarboxylate(PC). In this study, various sulfonated melamine-formaldehyde (SMF) superplasticizers were synthesized via four synthetic steps and reaction conditions such as the mole ratio of melamine to formaldehyde was changed. After application of SMF superplasticizer to cement concrete, the physical properties including workability, slump loss, compressive strength were compared with SNF

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The Physical Fluidity Properties of Cement Containing Melamine-type Superplasticizer Obtained with Various Synthetic Conditions (다양한 합성조건에서 얻어진 멜라민계 고유동화제가 함유된 시멘트의 물리적 유동특성)

  • Yoon, Sung-Won;Lee, Bum-Jae
    • Applied Chemistry for Engineering
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    • v.16 no.6
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    • pp.815-821
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    • 2005
  • Three major commercially available organic chemical admixtures are modified lignosulfonates (LS), sulfonated naphthalene-formaldehyde resins (SNF) and sulfonated melamine-formaldehyde (SMF). In this study, various sulfonated melamine-formaldehyde (SMF) superplasticizers were synthesized via four synthetic steps including hydroxymethylation (Step 1), sulfonation (Step 2), polymerization (Step 3) and neutralization and stabilization (Step 4). In this synthesis, mole ratio of melamine to formaline and the amount of acid catalyst used were varied. The obtained SMF superplasticizers were applied to cement paste and mortar and their physical properties including workability, slump loss, compressive strength were investigated. Also their hydrate shapes were investigated by examining SEM images of the cured paste. It was found that the fluidity properties of cement were significantly influenced by the structure of SMF condensates.