• Proceedings of the Korea Concrete Institute Conference
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• 2009.05a
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• pp.255-256
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• 2009

This purpose of this study was to evaluate the controlling effect of alkali-aggregate reactivity using mineral admixtures for aggregates in Korea according to test methods: chemical test by KS F 2545; mortar bar test by KS F 2546; accelerated mortar bat test by ASTM C 1260.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2011.05b
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• pp.31-34
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• 2011

In this study, for the evaluation of field application of low heat concrete using high volume mineral admixture, the characteristics of hydration heat generation and engineering properties of low heat concrete was investigated by mock-up test according to the replacement ratio of mineral admixture. Also, it was evaluated the compressive strength of low heat concrete with curing temperatures and ages for effective concrete mix design considering seasonal change.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2013.05a
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• pp.105-106
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• 2013

The construction of modern society, the use of high-strength concrete structures is becoming frequent. Admixture has been reported as a factor causing the explosion occurred. This study was experimental research on high strength concrete according to the kinds of admixture. Admixture of four different mix. fire resistance test results are outstanding when using blast furnace slag aggregate. When using silica fume spalling phenomena were most violent.

• Proceedings of the Korea Concrete Institute Conference
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• 1993.10a
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• pp.113-117
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• 1993

The purpose of this study is to raise the strength of concrete with admixture. The natural zeolites and mud stone, abundant in this country, were used as admixture for high-strengthening of concrete. Proper workability was gained by using the superplasticizer. The optimum replacement ratio of zeolite mud stone was 10% on unit -cement amount. At these optimum replacement ratio, the strength development over the plain concrete was 34% for zeolite and 16% for mud stone. Through this study, we concluded the natural zeolite and mud stone were adequate admixture for the high-strengthening of concrete.

• Journal of the Korean Recycled Construction Resources Institute
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• v.9 no.4
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• pp.529-536
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• 2021

In this study, nano-silica and nano-titanium were selected to determine the possibility of applying the binder to reactive nano materials. The basic characteristics of the nano material candidate group were reviewed. and the reactivity of nano materials was reviewed through K-value. The reactivity of the nano silicate materials was measured to be high. Therefore, as a final candidate group, nano silicate materials were selected. The finally selected reactive nano material was reviewed for its usability as a construction binder. The mechanical properties and unit weight of cement paste were reviewed using silica fume and blast furnace slag and nano materials. When cement composites with nano silicate materials, it was confirmed that it was effective in improving the mechanical performance and decrease the unit weight of cement composites.

• 레미콘
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• s.83
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• pp.30-38
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• 2005

• Journal of the Korean Recycled Construction Resources Institute
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• v.1 no.3
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• pp.173-180
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• 2013

This paper is to investigate an effect of waste cooking oil(WCO) on the engineering properties and durability of high volume admixture concrete. Fly ash with 30% and blast furnace slag with 60% were incorporated in OPC to fabricate high volume admixture concrete with 0.5 of W/B. Emulsified refining cooking oil(ERCO) was made by mixing WCO and emulsifying agent to improve fluidity. ERCO was replaced by cement from 0.25 to 1.0%. As results, the increase of ERCO resulted in decrease of slump and air contents. For compressive strength, the use of ERCO led to decrease the compressive strength at 28 days, while it had similar strength or much higher strength than plain concrete at 180 days. Resistance to carbonation and chloride penetration was improved with the increase of ERCO contents due to decreased pore distribution by saponification between ERCO and concrete, while freeze-thaw resistance was degraded due to air loss.

• Journal of the Korea Institute of Building Construction
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• v.16 no.1
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• pp.17-24
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• 2016

Recently, exposed concrete by machinery trowel is generally used in industrial floor such as warehouse. Also, concrete using only the cement has been mainly used except mineral admixture in order to secure surface abrasion resistance. However, in hot weather construction, it is causing a serious problem such as workability inhibition of trowel using only ordinary portland cement. Due to this, it was investigated the effect of application of fly-ash and ground granulated blast furnace slag on properties and abrasion resistance of concrete for industrial floor in this study. The result of this study, it was confirmed that fly-ash and ground granulated blast furnace slag can be used in concrete for industrial floor without affecting significantly the properties of concrete.

• Journal of the Korean Recycled Construction Resources Institute
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• v.5 no.2
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• pp.137-143
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• 2017

There has been a number of research on concrete durability. specially, as a research on chemical ingression, the research on the degradation against acid, alkali, and sulfate has been conducted. On the other hand, for the research on oils, especially, the influence of various oils on cement mortar with Supplementary Cementitious Materials(SCMs) is not sufficiently studied. hence, in this research, the degradation of cement mortar incorporated fly ash and blast furnace slag is researched when the cement mortar is submerged in various oils. For the result of experiment, as the content of fatty acid in the oils, the degradation of cement mortar with SCMs was occurred more, and the cement mortar with SCMs suffered more degradation than the ordinary portland cement regarding the oil submerging.

• Journal of the Korea Institute of Building Construction
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• v.16 no.6
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• pp.571-578
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• 2016

Recently, review on viability of various industrial by product and natural materials as raw material for concrete has been actively done in aspect of environment-friendly issue and depletion of natural resource. This study conducted fundamental study on the possibility of utilizing mud flat as admixture and filling material for concrete. First, chemical analysis on the viability of mud flat as admixture was done and the researchers compared it with the substance of fly ash and blast furnace slag. According to the result, substance content was proven to be inadequate. In addition, as the replacement rate of mud flat increased, compressive strength and tensile strength decreased. According to the estimated result of chemical substance analysis, possibility of utilizing mud flat as admixture was low. According to the result of experiment done as filling material, 10% ~ 30% replacement rate of mud flat manifested more than 8 Mpa of compressive strength of block which may be utilized for secondary product. However, additional experiment such as making block is required afterward. According to the result of flow experiment, as the replacement rate of mud flat increased, flow value decreased, and through chloride content analysis test, it was proven that mud flat is inappropriate to be applied as steel beam using structure since it has high content of sodium. It may be utilized as products that does not use steel beam such as internal brick.