| 폴리카복실레이트계 고유동화제의 분자구조가 시멘트 모르타르의 물성에 미치는 영향 |
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| Effects on the Properties of Cement Mortar with Various Molecular Structures of Polycarboxylate-Type Superplasticizers |
| Jong-Taek Song, Ho-Seok Ryu |
| Department of Materials Science and Engineering, Dankook University |
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| ABSTRACT |
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This paper presents the experimental results on the properties of the cement mortar with polycarboxylate-type superplasticizers PCA) which were synthesized by different mole ratio of methoxypoly(ethyleneglycol)monomethacrylate (MPEGMAA) and methacrylic acid (MAA) and by different length of polyethyleneoxide (PEO). As the PEO chain was longer and mole ratio of [MPEGMAA]/[MAA] was lower, the fluidity of cement mortar was better. The setting time of mortar with PCA was retarded, and as PEO chain was shorter and [MPEGMAA]/[MAA] was lower, it was more retared. Espeacially, when the molecular weight of MPEGMAA was 475(repeat unit of ethylene oxide=l0), the degree of retardation was the highest of them. The surface tensions of PCA solutions were lower than that of water due to the effect of PEO chain, and also the pore size distribution of cement mortar was influenced by it. The pores in cement mortar with PCA at 28 days were macropores in the range of 7 to 370$mutextrm{m}$, and accordingly, the densities and compressive strengths of mortar were lower than those of OPC mortar. |
| Key words:
Polycarboxylate, Superplasticizer, Fluidity, Setting time, Pore size distribution |
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