The effect of NaOH content on rheological properties, microstructures and interfacial characteristic of alkali activated phosphorus slag fresh pastes

2020 ◽  
Vol 252 ◽  
pp. 119132 ◽  
Author(s):  
Fuzhu Xie ◽  
Ze Liu ◽  
Dawang Zhang ◽  
Jixiang Wang ◽  
Dongmin Wang ◽  
...  
Keyword(s):  
Rheological Properties ◽  
Interfacial Characteristic ◽  
Alkali Activated

scholarly journals Rheology of Alkali-Activated Blended Binder Mixtures

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5405
Author(s):  
Biruk Hailu Tekle ◽  
Ludwig Hertwig ◽  
Klaus Holschemacher
Keyword(s):  
Sodium Hydroxide ◽  
Rheological Properties ◽  
Yield Stress ◽  
Sodium Silicate ◽  
Total Solid ◽  
Environmental Benefits ◽  
Total Water ◽  
The Past ◽  
Binder Ratio ◽  
Alkali Activated

Alkali-activated cement (AAC) is an alternative cement that has been increasingly studied over the past decades mainly because of its environmental benefits. However, most studies are on heat-cured AACs and are focused on mechanical properties. There is a lack of research on the fresh properties of ambient-cured AAC systems. This study investigates the rheological properties of ambient-temperature-cured alkali-activated blended binder mixtures activated with sodium silicate and sodium hydroxide solutions. The influence of binder amount, alkaline solid to binder ratio (AS/B), sodium silicate to sodium hydroxide solids ratio (SS/SH), and total water content to total solid (from the binding materials) ratio (TW/TS) on the rheological properties are investigated. The effect of borax as an admixture and silica fume as a replacement for fly ash is also investigated. The results showed that both the yield stress and plastic viscosity are mainly affected by the binder content and TW/TS ratio decreasing with the increase of each parameter. The yield stress increased with the increase of the SS/SH ratio. Borax significantly reduced the yield stress, while silica fume’s effect was dependent on its dosage.

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.

Understanding the rheological properties of alkali-activated slag pastes from the cohesion and friction interactions

2021 ◽  
Vol 291 ◽  
pp. 123311
Author(s):  
Yi Tian ◽  
Changhui Yang ◽  
Shijun Yuan ◽  
Hongxiao Yuan ◽  
Kai Yang ◽  
...  
Keyword(s):  
Rheological Properties ◽  
Alkali Activated Slag ◽  
Activated Slag ◽  
Alkali Activated

scholarly journals Effect of alkali cation type on the plasticizing effect of ligno-sulfonate in alkali-activated systems

2021 ◽  
Vol 1205 (1) ◽  
pp. 012016
Author(s):  
V Iliushchenko ◽  
V Bilek Jr. ◽  
L Kalina ◽  
P Hruby ◽  
T Opravil ◽  
...  
Keyword(s):  
Rheological Properties ◽  
Blast Furnace Slag ◽  
Dry Matter ◽  
Oscillation Amplitude ◽  
Granulated Blast Furnace Slag ◽  
Cation Type ◽  
Alkaline Activator ◽  
Furnace Slag ◽  
Alkali Activated ◽  
Slag Weight

Abstract The rheological properties of alkali-activated systems are significantly affected by the nature of the alkaline activator. Hydroxide-activated systems’ workability is typically lower than that of alkali-activated systems but can be improved by lignosulfonate plasticizer. However, the lignosulfonate plasticizer’s effectivity depends on the dosage of lignosulfonate, the nature of hydroxide and pH of their solutions. Therefore, in this study, the effectiveness of lignosulfonate plasticizer with respect to alkali ion type (Na+, K+, Li+) in alkali hydroxide-activated systems based on ground granulated blast furnace slag was evaluated. The concentration of the alkaline activator (NaOH, KOH and LiOH) was the same in all cases of 4M. The superplasticizer dosage was 0%, 0.5% and 1.0% of dry matter of lignosulfonate plasticizer to the slag weight. Rheological properties were determined using a rotational rheometer equipped with vane in-cup geometry working in oscillation amplitude sweep mode, from which critical strain and corresponding viscoelastic variables were obtained.

scholarly journals The Effect of the Activator/Precursor Ratio on the Rheological Properties of the Alkali-activated Mining Waste Mud Paste

2020 ◽  
Author(s):  
Abdelhakim Benhamouda ◽  
João Castro-Gomes ◽  
Luiz Pereira-de-Oliveira
Keyword(s):  
Compressive Strength ◽  
Sodium Hydroxide ◽  
Rheological Properties ◽  
Yield Stress ◽  
Rheological Behaviour ◽  
Mining Waste ◽  
Bingham Model ◽  
Precursor Ratio ◽  
Alkali Activated ◽  
The Ideal

To determine the properties of paste, mortar or concrete, it is necessary to understand its rheological behaviour first. This study discusses the effect of the activator/precursor ratio on the rheological properties of the alkali-activated paste. The pastes consisted of a mix of 70 % of tungsten mining waste mud, 15% waste glass and 15% of metakaolin. This mix was activated by combining sodium hydroxide and sodium silicate. Five activator/precursor (a/p) ratios were studied: 0.37, 0.38, 0.39, 0.40 and 0.41. The result obtained shows that the rheology of the pastes is affected by the activator/precursor ratio. The rheological behaviour of the paste fits the Bingham model. The yield stress (τ0) and plastic viscosity (μ) increase inversely with the activator/precursor ratio (e.g. a/p=0.37 gives τ0=84.19 and μ=0.4185; a/p=0.41 gives τ0=30.389 and μ=0.2937). The workability increases proportionally with the activator/precursor ratio (e.g. a/p=0.37 gives a slump=133 mm; a/p=0.41 gives a slump=158 mm). The compressive strength decreases when the activator/precursor ratio increases (e.g. at 28 days for a/p=0.37, the compressive strength was 19.6 MPa; for a/p=0.41, the compressive strength was 13 MPa). Finally, the ideal ratios were 0.38 and 0.39.

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