• Cement Symposium
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• no.28
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• pp.179-186
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• 2001

• 레미콘
• /
• no.9 s.17
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• pp.80-82
• /
• 1988

• 레미콘
• /
• no.1 s.34
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• pp.29-36
• /
• 1993

• Cement
• /
• s.151
• /
• pp.55-61
• /
• 1999

• 월간 기계설비
• /
• s.44
• /
• pp.83-85
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• 1994

• 월간산업보건
• /
• s.113
• /
• pp.50-53
• /
• 1997

• Journal of the Korean Chemical Society
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• v.41 no.12
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• pp.653-660
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• 1997

Silicone rubber-matrix membranes doped with tetradecyltrimethylammonium chloride (TDTMACl) are used to enhance electrode performance for chloride measurements in physiological samples. The optimized membrane formulation incorporates 95.4 wt% silicone rubber and 4.6 wt% TDTMACl, and its pH response is negligible in the range of pH 6-10. The TDTMACl-doped silicone rubber membrane exhibits sub-Nernstian response to chloride from 10 to 300 mM (-37.5 mV/decade), but its selectivities for chloride over other anions are remarkably enhanced: KpotCl,NO3=1.3, KpotCl,I=2.0, KpotCl,Sal=0.8, KpotCl,SCN=2.0 and KpotCl,ClO4=0.8. Furthermore, since the silicone rubber-matrix membrane exhibits better adhesion to the solid surface than do PVC membranes, the lifetime of the coated-wire type membrane electrode is greatly improved. The response properties toward chloride and salicylate for solid-state sensor are not significantly changed after at least 35 days of use.

• Analytical Science and Technology
• /
• v.14 no.4
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• pp.349-355
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• 2001

A series of micro- and mesoporous activated carbons were prepared from phenolic resin using a metal treated chemical activation methodology. $N_2$-adsorption data were used to characterize the surface properties of the produced activated carbons. Results of the surface properties and pore distribution analysis showed that phenolic resin can be successfully converted to micro- and mesoporous activated carbons with specific surface areas higher than $962.3m^2/g$. Activated carbons with porous structure were produced by controlling the amount of metal chlorides($CdCl_2$, $CuCl_2$). Pore evolvement was shown to be most effected by the incremental addition of metal chloride. From the thermodynamic DSC data, enthalpy formations(${\Delta}H$) of first endothermic reaction were increase with the incremental addition of metal chloride.

• Korean Journal of Soil Science and Fertilizer
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• v.14 no.2
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• pp.59-63
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• 1981

A field Experiment was conducted to evaluate a newly formulated N-K compound fertilizer (17-0-17) as a topdress ing fertilizer for rice in a poorly drained clayey soil, using Milyang 23 rice as test crop. The results are summarized as follows : 1. Both in terms of rice yield and uptake ratio of applied K, it was found that the tested N-K compound fertilizer is more effective than potassium chloride. 2. The detailied causes for the superiority of new compound fertilizer were not clarified.

• Journal of the Korean Recycled Construction Resources Institute
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• v.4 no.3
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• pp.259-268
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• 2016

The service life evaluation in RC(Reinforced Concrete) structure exposed to chloride attack can be classified into deterministic and probabilistic method, and it significantly varies with design parameters. The present work derives PDF (Probability of Durability Failure) and the related service life considering time-dependent diffusion coefficient and internal parameters such as reference diffusion coefficient, critical chloride content, and time-exponent. When critical chloride content increases to 133.3%, the changing ratios of service life are 134.0~145.4% for deterministic method and 149.2%~152.5% for probabilistic method, respectively. In the case of increasing time-exponent to 200%, they increase to 323.8% for deterministic method and 346.0% for probabilistic method. Through adopting time-diffusion coefficient for probabilistic method, reasonable service life evaluation can be achieved, and it is also verified that increasing time-exponent through mineral admixture is very effective to extension of service life in RC structure.