Influence of the activator concentration of sodium silicate on the thermal properties of alkali-activated slag pastes

Rashad, Alaa M.; Zeedan, Sayieda R.; Hassan, Ahmed A.

doi:10.1016/j.conbuildmat.2015.11.023

Cited by 93 publications

(39 citation statements)

References 31 publications

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“…The following sections are thus focused on the characterization of various aspects of NC-activated GGBS and the effects of the accelerators such as NH and CH. The main binding phase C-(A)-S-H reflected at approximately 30° (2θ) (Rashad et al, 2016;Lopez and Garcia, 2016) was found in all specimens throughout the all XRD measurements. This characteristic peak overlapped with the strong peak for calcite at the same position (Kovtun et al, 2015;Puertas and Carrasco, 2014).…”

Section: Compressive Strength Developmentmentioning

confidence: 87%

Microstructure and Strength Development of Sodium Carbonate–Activated Blast Furnace Slags

Aktürk

Nayak

Das

et al. 2019

J. Mater. Civ. Eng.

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This paper presents the study of alkali activated slags where sodium carbonate acts as a primary activator. The slow activation mechanism of sodium carbonate is accelerated by sodium hydroxide and with traces of calcium hydroxide. Strength development and the progress of hydration of the mixes are studied with the phase transformation and development of microstructural features through quantitative techniques such as thermogravimetric analysis and phase-identification techniques such as Fourier transform infrared spectroscopy and X-ray diffraction. Sodium carbonate replacement with sodium hydroxide and the presence of calcium hydroxide in the binder as a replacement of the slag enhances the rate of dissolution of slag leading to a faster strength development. Calcium hydroxide is significantly increased the compressive strength even at early age. On the other hand, sodium hydroxide substitution is effective at later ages of the reaction when used at high dosages (e.g. 40%). Formation of strength giving phases such as hydrotalcite and calcium aluminum silicate hydrate are confirmed with the microstructure analysis and explains the strength development.

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Section: Compressive Strength Developmentmentioning

confidence: 87%

Microstructure and Strength Development of Sodium Carbonate–Activated Blast Furnace Slags

Aktürk

Nayak

Das

et al. 2019

J. Mater. Civ. Eng.

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“…각각의 5 % activator와 10 % activator를 계량한 뒤 계산된 수량만큼 배 합수를 붓고 잘 저은 다음 실험실내 실온에서 6시간 정치한 후에 믹싱에 사용하였다. GGBFS는 각각 GGBFS-A와 GGBFS- Haha et al 2011;Haha et al 2012 1999;Atiş et al 2009;Chi 2012;Rashad et al 2016 et al 1999;Neto et al 2008;Atiş et al 2009;Chi 2012;Rashad et al 2016). 혼합률에 따른 특성을 살펴보면 5 % activator과 10 % activator 모두 R0에서 R10로 혼합률이 변화함에 따라 공 극의 크기와 공극률이 감소하고 있다.…”

Section: 시험체 제작unclassified

“…Fig. 8의 (a) (Fernández-Jiménez et al 1999;Atiş et al 2009;Chi 2012;Rashad et al 2016). 따라서 알칼리 활성화 제의 농도의 증가에 따른 GGBFS의 반응성이 증가하여 조직 (a) Cumulative intrusion of 5 % activator specimens (b) Log differential intrusion of 5 % activator specimens (c) Cumulative intrusion of 10 % activator specimens (d) Log differential intrusion of 10 % activator specimens GGBFS를 기본 결합재로 하는 AASC의 반응생성물질인 C-S-H 중의 Ca/Si 와 Al/Si 비는 다양한 값의 범위를 나타낸다 (Brough and Atkinson 2002;Haha et al 2011;Haha et al 2012;Walkely et al 2016).…”

Section: Fig 8이unclassified

The Strength Properties of Alkali-Activated Cement with Blended Ground Granulated Blast Furnace Slag

2018

Korea Concrete Institute

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“…A direct relationship has been observed between drying shrinkage and pore structures [20], with finer pore size distribution resulting in increased drying shrinkage while improving the compressive strength [21,22]. The silicate modulus and alkali content have been found to be the main parameters for the properties of the slag activated by water glass [23][24][25]. The optimum silicate modulus and sodium concentration in terms of fresh and hardened properties of AAS are due to the excess alkali being unable to fully react with the slag [26].…”

Section: Introductionmentioning

confidence: 98%

Use of Industrial Waste Slag in Alkali-Activated Slag Ceramsite Concrete Hollow Blocks

et al. 2018

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In this paper, a parametric experimental study developing the alkali-activated slag concrete hollow block (AASCHB) is discussed. Fourteen trial mixes of alkali-activated slag concrete containing pottery sand and ceramsite with different water-to-slag ratios, sand ratios, silicate moduli, and Na2O contents were evaluated to determine the optimal mix for high compressive strength and low drying shrinkage. All four factors evaluated were found to be significant for the desired properties. A series of 390 × 190 × 190 mm3 AASCHBs were prepared using the optimal mix with a water-to-slag ratio of 0.35, sand ratio of 0.64, silicate modulus of 1.2, and Na2O content of 8%. The compressive strength, flexural strength, water absorption, and moisture content tests of these blocks indicate that the resulting AASCHB can be classified under the strength grade of MU15 as a load-bearing hollow concrete block. The proposed AASCHBs appear to provide a viable solution to the environmental problems of industrial waste and cement production emissions, leading to more sustainable buildings without compromising structural performance.

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Influence of the activator concentration of sodium silicate on the thermal properties of alkali-activated slag pastes

Cited by 93 publications

References 31 publications

Microstructure and Strength Development of Sodium Carbonate–Activated Blast Furnace Slags

Microstructure and Strength Development of Sodium Carbonate–Activated Blast Furnace Slags

The Strength Properties of Alkali-Activated Cement with Blended Ground Granulated Blast Furnace Slag

Use of Industrial Waste Slag in Alkali-Activated Slag Ceramsite Concrete Hollow Blocks

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