• Cement Symposium
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• no.21
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• pp.51-59
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• 1993

• Journal of the Korean Recycled Construction Resources Institute
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• v.6 no.1
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• pp.1-7
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• 2018

This study examined the effect of binder-to-soil ratio(B/S) and water-to-binder ratio(W/B) on the flow and compressive strength development of soil concrete using high-volume supplementary cementitious materials. As a partial replacement of ordinary portland cement, 10% by-pass dust, 40% ground granulated blast-furnace slag, and 25% circulating fluidized bed combustion fly ash were determined in the preliminary tests. Using the low-cement binder incorporated with clay soil or sandy soil, a total of 18 soil concrete mixtures was prepared. The flow of the soil concrete tended to increase with the increase in W/B and B/S, regardless of the type of soils. The compressive strength was commonly higher in sandy soil concrete than in clay soil concrete with the same mixture condition. Considering the high-workability and compressive strength development, it could be recommended for low-cement soil concrete to be mixed under the following condition: B/S of 0.35 and W/B of 175%.

• Cement
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• s.189
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• pp.41-48
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• 2011

고로시멘트는 포틀랜드시멘트와 고로슬래그의 혼합시멘트로, 최근에는 특히 저탄소 녹색성장 환경에 우수한 시멘트로서 관심이 모아지고 있다. 1824년 영국의 연와공 조셉 아스프딘(Joseph Aspdin)에 의해 발명된 포틀랜드시멘트는 약 184년의 역사를 가지고 있는 반면에, 일본의 슬래그시멘트 역사는 작년이 탄생부터 정확히 100년이 되기 때문에, 잠시 그 역사의 일부를 돌이켜 생각해 보고자 한다. 최근 슬래그시멘트는 건설시장에서 보통포틀랜드시멘트와 경쟁하기 위하여 발열억제를 위한 저발열고로시멘트를 개발하고, 강도경쟁에 의한 품질안정을 위하여 분리분쇄 추진, 고로슬래그에 적합한 클링커를 개발하고, 자기 수축 저감 등을 위한 연구도 병행하고 있다. 날로 심화되는 건설환경에서 살아 남기 위한 여러 방법들이 강구되고 있는 것이다. 고로시멘트는 보통포틀랜드시멘트와 비교해서 중성화, 강도발현을 위한 충분한 습윤양생 등 몇 가지 약점도 있지만, 슬래그시멘트 본연의 고유의 특성을 잘 나타내는 내해수성, 내염성, ASR 등의 장점들도 않고 "환경에 뛰어난" 시멘트로 각인된 만큼, 갖고 있는 특징들을 충분히 잘 활용하고, 개선 보완 시켜나가면 21세기의 최상의 재료로 평가 받을 수 있다고 기대해 본다. 끝으로, 본 자료는 신일철고로시멘트(주)단(檀)이 기고한 (콘크리트공학 2010년 10월호) 논문을 요약 발췌한 것이다.

• Cement Symposium
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• s.36
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• pp.61-67
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• 2009

• Journal of the Korean Recycled Construction Resources Institute
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• v.5 no.3
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• pp.223-229
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• 2017

When concrete is exposed to neutron rays for a long time, the concrete tends to become activated. If activated, it is classified as middle or low level radioactive waste. However, the great amount of the activated concrete is hard to dispose. In this study, low-activation cement was developed for decreasing the activated waste from shielding concrete around nuclear reactor. Furthermore, the manufactured low-activation was analyzed with activation nuclide Eu, Co. The low-activation cement showed great advantage for low-activation with detecting none of Eu and 3.75ppm of Co while ordinary portland cement showed 0.4~0.9ppm of Eu, 5.5~19.8ppm of Co content. As the results of physical properties of the low-activation cement, it is similar to type 1 ordinary portland cement and accords with type 4 low heat portland cement. Meanwhile, as for the chemical properties of the cement, it accords wite type 1 and 4 at the same time.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2015.11a
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• pp.143-144
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• 2015

In this research it was attempted to analyze the general engineering properties of low cement mortar according to the type of setting accelerator and substitution rate, when 1% substitution rate for setting accelerator was used a high rate of compressive strength manifestation was shown and that the WS-10 type setting accelerator was appropriate. For the rate of change of length, when 3% substitution rate for setting accelerator was used, it was shown that due to initial expansion the shrinkage compensation was not significant, and when taking into consideration strength and shrinkage, 1% of WS-10 was shown to be appropriate.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2023.05a
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• pp.295-296
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• 2023

This study evaluated the compressive strength after making mortar with low cement composition for carbon-neutral steam curing to respond to climate change. Blast furnace slag, fly ash, and ultra-high powder fly ash were used as substitutes for cement. The cement substitute was used at 40% of the mass of cement, and after steam curing, the compressive strength was measured on the 1st, 3rd, 7th and 28th days of age. As a result of the experiment, at the age of 1 day, the mixture using only cement showed the highest strength, but from the 3rd day, the specimen using ultra-high powder showed a high strength development rate, followed by blast furnace slag and fly ash.

• Proceedings of the Korean Ceranic Society Conference
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• 2000.04a
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• pp.115.2-115.2
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• 2000

• Resources Recycling
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• v.23 no.3
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• pp.13-20
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• 2014

Nowadays, due to the development of industrial and civil engineering technology, enlargement and diversification of concrete structures are being tried. At the same time, the hydration heat generated during the construction of large structures lead to thermal crack, which is occurs causing a problem that durability degradation. In this paper, in order to study the durability and reducing hydration heat of concrete according to the types of cement, that is ordinary portland cement, fly ash cement mixed with a two-component, ternary blend cement mixed with fly ash and blast furnace slag and low heat cement concrete are produced, and compare and analyze the results using property, durability and hydration characteristics, ternary blend cement is appeared to be the most excellent in durability and reduction of hydration heat, and it was determined suitable for construction of mass concrete and requiring durability.

• 레미콘
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• no.4 s.71
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• pp.18-27
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• 2002