Experimental Study on Rheological Properties of Alkali Activated Slag Pastes with Water to Binder Ratio

2015 ◽  
Vol 27 (5) ◽  
pp. 511-519 ◽  
Author(s):  
Byeong-Jo Kim ◽  
Jin-Kyu Song ◽  
Keum-Il Song ◽  
Myeong-Hyeon Oh ◽  
Bang-Yeon Lee
Keyword(s):  
Experimental Study ◽  
Rheological Properties ◽  
Alkali Activated Slag ◽  
Binder Ratio ◽  
Activated Slag ◽  
Water To Binder Ratio ◽  
Alkali Activated

scholarly journals Strength Development and Microstructure of Alkali-activated Slag-MgO in Air Curing Condition

2018 ◽  
Vol 186 ◽  
pp. 02003
Author(s):  
Chao-Lung Hwang ◽  
Duy-Hai Vo ◽  
Mitiku Damtie Yehualaw ◽  
Vu-An Tran
Keyword(s):  
Compressive Strength ◽  
Strength Development ◽  
X Ray Diffraction ◽  
Alkali Activated Slag ◽  
X Ray ◽  
Binder Ratio ◽  
Curing Condition ◽  
Activated Slag ◽  
Water To Binder Ratio ◽  
Alkali Activated

The aim of this study is to analysis the effect of MgO on strength development and microstructure of alkali-activated slag (AAS) in air curing condition. Four mixtures of AAS are prepared using different MgO content (0%, 5%, 10%, and 15 % by weight of slag) at water to binder ratio of 0.4. The flow, compressive strength, scanning electron microscopy, and X-ray diffraction are tested under relevant standards. The addition of MgO significantly accelerated the hydration rate of AAS. AAS with adding MgO tended to increase the compressive strength and to reduce the flow. The higher adding MgO content was associated with higher hydrotalcite-like phase (Ht) formation which improved the microstrure of AAS in the air curing condition.

Experimental Study on Alkali-Activated Slag-Lithium Slag-Fly Ash Environmental Concrete

2011 ◽  
Vol 287-290 ◽  
pp. 1237-1240
Author(s):  
Lan Fang Zhang ◽  
Rui Yan Wang
Keyword(s):  
Experimental Study ◽  
Compressive Strength ◽  
Fly Ash ◽  
Setting Time ◽  
Alkali Activated Slag ◽  
Percent Increase ◽  
Compressive Strength Of Concrete ◽  
Activated Slag ◽  
Lithium Slag ◽  
Alkali Activated

The aim of this paper is to study the influence of lithium-slag and fly ash on the workability , setting time and compressive strength of alkali-activated slag concrete. The results indicate that lithium-slag and fly-ash can ameliorate the workability, setting time and improve the compressive strength of alkali-activated slag concrete，and when 40% or 60% slag was replaced by lithium-slag or fly-ash, above 10 percent increase in 28-day compressive strength of concrete were obtained.

scholarly journals The Durability of One-Part Alkali-Activated Slag-Based Mortars in Different Environments

2020 ◽  
Vol 12 (9) ◽  
pp. 3561 ◽  
Author(s):  
Luigi Coppola ◽  
Denny Coffetti ◽  
Elena Crotti ◽  
Gabriele Gazzaniga ◽  
Tommaso Pastore
Keyword(s):  
Magnesium Sulphate ◽  
Alkali Content ◽  
Freezing And Thawing ◽  
Alkali Activated Slag ◽  
Freeze Thaw ◽  
Gypsum Formation ◽  
Binder Ratio ◽  
Activated Slag ◽  
High Alkali ◽  
Alkali Activated

The paper assesses the durability of one-part alkali-activated slag-based mortars (AAS) in different aggressive environments, such as calcium chloride- and magnesium sulphate-rich solutions, in comparison with traditional cementitious mortars at equal water to binder ratio. Moreover, the freezing and thawing resistance was evaluated on mortars manufactured with and without air entraining admixture (AEA). Experimental results indicate that the alkali content is a key parameter for durability of AAS: the higher the alkali content, the higher the resistance in severe conditions. In particular, high-alkali content AAS mortars are characterized by freeze–thaw resistances similar to that of blast furnace cement-based mixtures, but lower than that of Portland cement-mortars while AAS with low activators dosages evidence a very limited resistance in cold environment. The effectiveness of AEA in enhancement of freeze–thaw resistance is confirmed also for AAS mortars. Moreover, AAS mixtures are quasi-immune to expansive calcium oxychloride formation in presence of CaCl2-based deicing salts, but they are very vulnerable to magnesium sulphate attack due to decalcification of C-S-H gel and gypsum formation.

Experimental Study of Alkali-Activated Red Mud Cement Material

2013 ◽  
Vol 357-360 ◽  
pp. 705-709 ◽  
Author(s):  
Min Zhou ◽  
Yong Sheng Ji ◽  
Zheng Chang ◽  
Chan Zhang ◽  
Xing Tong Yan
Keyword(s):  
Experimental Study ◽  
Flexural Strength ◽  
Red Mud ◽  
Hydration Reaction ◽  
Cement Material ◽  
Alkali Activated Slag ◽  
Strength Variation ◽  
Activated Slag ◽  
Alkali Activated ◽  
Sem Test

In order to use the alkaline ingredient in red mud, this paper studied the strength variation law of alkali-activated red mud and lime cement material combined with slag. When the content ranged from 0 wt% to 20 wt%, the experiment showed that the flexural strength increased when the content increased, and the compress strength increased when the content increased with the content ranging from 0 wt% to 15 wt%. When the content reached 25 wt%, the strength of alkali-activated red mud cement material was equal with alkali activated slag cement. The SEM test of alkali-activated red mud cement material showed that red mud and lime both participated in hydration reaction fully.

Adsorption of Naphthalene-Based Water Reducer on Alkali-Activated Slag Cement

2012 ◽  
Vol 226-228 ◽  
pp. 1747-1750
Author(s):  
Chang Hui Yang ◽  
Qun Pan ◽  
Jiong Zhu
Keyword(s):  
Zeta Potential ◽  
Rheological Properties ◽  
Water Glass ◽  
Slag Cement ◽  
Alkali Activated Slag ◽  
Absolute Value ◽  
Adsorption Of Water ◽  
Activated Slag ◽  
Alkali Activated ◽  
Over Time

In this work, the adsorption of naphthalene-based water reducer (FDN) on slag ground with or without the composite retarder YP-3 and PN (YP) in alkali-activated slag cement (AASC) activated by water glass (WG) has been studied in detail. The results show that the effect of the adsorption of water reducer on AASC depends directly on the dosage of the water reducer and on the composite retarder used. For example, mixed slag particles adsorb thrice as much water reducer FDN than pure slag particles at 1% mass of the slag, and the absolute value increment of the zeta potential of the AASC suspension containing the composite retarder is 8.61 mV, compared with 1.99 mV in the system without the composite retarder. Moreover, the AASC pastes activated by WG containing the retarder YP show better rheological properties and lower fluidity loss over time.

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