• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.2
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• pp.1188-1194
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• 2014

The purpose of this study is to estimate Chloride Attack Resistibility and mechanical properties of quaternary concrete adding fly ash, blast-furnace slag, and silica fume. Compressive strength, modulus of elasticity, chloride migration coefficient, charge passed from Rapid chloride penetration test(RCPT), and immersion testing in 3% NaCl are tested. Chloride migration coefficient and charge passed of quaternary concrete measured $0.032{\times}10^{-12}m^2/sec$ and 650 coulomb at 17 weeks, which are in a permitted limit. Also in immersion test, depth of chloride penetration and maximum chloride ion of quaternary concrete measured 3.7 mm and $10.211kg/m^3$ respectively. From the results, quaternary concrete adding fly ash, blast-furnace slag, and silica fume denotes improvement of mechanical properties and chloride attack resistibility.

• The Korean Journal of Quaternary Research
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• v.19 no.2
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• pp.7-12
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• 2005

• The Korean Journal of Quaternary Research
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• v.19 no.2
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• pp.70-72
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• 2005

• The Korean Journal of Quaternary Research
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• v.22 no.2
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• pp.31-33
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• 2008

• Proceedings of the Korean Quaternary Association Conference
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• 2006.06a
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• pp.57-60
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• 2006

• Proceedings of the Korean Quaternary Association Conference
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• 2004.11a
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• pp.44-55
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• 2004

• East Asian mathematical journal
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• v.28 no.5
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• pp.605-615
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• 2012

In this paper, we show that any definite lattice over $\mathbb{F}_q[x]$ is universal if and only if it is quaternary and its discriminant is of degree 2, where $ch(\mathbb{F}_q){\neq}2$. The Four Conjecture follows as an immediate consequence.

• The Korean Journal of Quaternary Research
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• v.19 no.2
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• pp.65-67
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• 2005

• The Korean Journal of Quaternary Research
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• v.21 no.2
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• pp.68-68
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• 2007

• The Korean Journal of Quaternary Research
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• v.21 no.2
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• pp.25-27
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• 2007