A study of the effect of light-burnt dolomite on the hydration of alkali-activated Portland blast-furnace slag cement

Yang, Wan-Hee; Ryu, Dong-Woo; Park, Dong-Cheol; Kim, Woojae; CheeHo, Seo

doi:10.1016/j.conbuildmat.2014.01.071

Cited by 19 publications

(8 citation statements)

References 13 publications

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“…Thus, a higher LBD content promotes dissolution. A similar heat evolution enhancement was observed in a previous study of an AAS system with dolomite [28,44]. Yang et al [28] found that the increase in heat evolution with LBD was due to the hydration procedure for LBD.…”

Section: Resultssupporting

confidence: 82%

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Effects of Light-Burnt Dolomite Incorporation on the Setting, Strength, and Drying Shrinkage of One-Part Alkali-Activated Slag Cement

et al. 2019

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This study investigates the potential of light-burnt dolomite (LBD) as a supplementary cementitious material with ground granulated blast furnace slag (GGBFS) and Ordinary Portland cement (OPC). In this work, LBD was substituted for up to 20% of GGBFS in sodium sulfate-activated slag systems. The effects of LBD incorporation on the flow, setting time, compressive and flexural strength development, and drying shrinkage were explored with, X-ray diffraction and thermogravimetric analyses. LBD incorporation resulted in greater strength development of an alkali-activated slag system. The optimum LBD content for strength development was 10%, regardless of ordinary Portland cement content. In addition, LBD decreased the drying shrinkage, accelerated the hydration process, and induced hydrotalcite formation, which can be attributed to the reactive MgO inside LBD.

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Section: Resultssupporting

confidence: 82%

“…LBD is an economical powder-phased lime material that is used as an activator. A previous study [28] used LBD, up to 2%, as an activator with sodium silicate solution, in order to analyze the hydration and strength development of AAS. However, other studies have not used LBD as an SCM.…”

Section: Introductionmentioning

confidence: 99%

Effects of Light-Burnt Dolomite Incorporation on the Setting, Strength, and Drying Shrinkage of One-Part Alkali-Activated Slag Cement

et al. 2019

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“…During cement hydration, Ca(OH) 2 is educed from the combination of GGBS and water, and therefore generates alkali activation effects. Yang et al found that using Na 2-SO 4 as an alkali activator can reduce 80-90% of cement usage, though the strength of the product decreases after 28 days [13]. McLellan et al blended waterglass (i.e., sodium silicate) and NaOH to produce an alkaline liquid for activating GGBS, but the activator was more expensive than traditional cements and had problems such as rapid setting [14].…”

Section: Introductionmentioning

confidence: 98%

Using GGBOS as the alkali activators in GGBS and GGBOS blended cements

Tsai¹,

Huang²,

Lin³

et al. 2014

Construction and Building Materials

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“…이러한 해안 구조물에 사용하는 콘크리트는 여 러 가지 환경 조건에 의해 성능 저하가 일어나게 되는데, 그 중 가장 심각한 내구성 저하 요인은 염소이온의 침투에 의한 철근의 부식이다 [1,2]. 는 것은 지속가능한 건설 재료의 활용이라는 측면에서 최근 많은 주목을 받고 있으며 [12,13], 고로슬래그 미분말을 대 량 활용하는 경우에 알칼리 활성화를 통해 조기 강도를 보 완하는 방안이 보고된 사례도 있다 [6,14,15,16]. 따라서 내구성 증가의 목적으로 3성분계 시멘트를 활용할 때 알칼 리 설페이트계 활성화제의 사용은 조기강도의 개선 목적으 로 유효한 방안이 될 수 있으나, 이러한 경우에 염해저항성 과 같은 내구성의 변화를 고찰한 사례는 부족한 실정이다.…”

Section: 연구의 목적unclassified

An Experimental Study on the Chloride Attack Resistibility of Alkali-Activated Ternary Blended Cement Concrete

Yang¹,

Hwang²,

Jeon³

et al. 2016

Journal of the Korea Institute of Building Construction

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The use of ternary blended cement consisting of Portland cement, granulated blast-furnace slag (GGBFS) and fly ash has been on the rise to improve marine concrete structure's resistance to chloride attack. Therefore, this study attempted to investigate changes in chloride attack resistibility of concrete through NT Build 492-based chloride migration experiments and test of concrete's ability to resist chloride ion penetration under ASTM C 1202(KS F 2271) when 1.5-2.0% of alkali-sulfate activator (modified alkali sulfate type) was added to the ternary blended cement mixtures (40% ordinary Portland cement + 40% GGBFS + 20% fly ash). Then, the results found the followings: Even though the slump for the plain concrete slightly declined depending on the use of the alkali-sulfate activator, compressive strength from day 2 to day 7 improved by 17-42%. In addition, the coefficient from non-steady-state migration experiments for the plain concrete measured at day 28 decreased by 36-56% depending on the use of alkali-sulfate. Furthermore, total charge passed according to the test for electrical indication of concrete's ability to resist chloride ion penetration decreased by 33-62% at day 7 and by 31-48% at day 28. As confirmed in previous studies, reactivity in the GGBFS and fly ash improved because of alkali activation. As a result, concrete strength increased due to reduced total porosity.

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A study of the effect of light-burnt dolomite on the hydration of alkali-activated Portland blast-furnace slag cement

Cited by 19 publications

References 13 publications

Effects of Light-Burnt Dolomite Incorporation on the Setting, Strength, and Drying Shrinkage of One-Part Alkali-Activated Slag Cement

Effects of Light-Burnt Dolomite Incorporation on the Setting, Strength, and Drying Shrinkage of One-Part Alkali-Activated Slag Cement

Using GGBOS as the alkali activators in GGBS and GGBOS blended cements

An Experimental Study on the Chloride Attack Resistibility of Alkali-Activated Ternary Blended Cement Concrete

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