Possibilities of Processing of Slag Aggregate from Heap Koněv

2019 ◽  
Vol 292 ◽  
pp. 79-84
Author(s):  
Lukáš Procházka ◽  
Jana Boháčová
Keyword(s):  
Blast Furnace ◽  
Portland Cement ◽  
Mechanical Parameters ◽  
Durability Properties ◽  
Subsequent Determination ◽  
Alkali Activated

The aim of this work is to find out whether the slag aggregates from heap Koněv can be used in hydraulic mixtures based on traditional Portland cement as well as in alternative binders based on alkali activated blast furnace slag.In the experiment the basic physical-mechanical parameters of prepared mixtures were determined and the durability properties of these composites were verified. The composition of the aggregate extract and its influence on the properties of the prepared mixtures and the subsequent determination of the alkaline ions in slag aggregates were also verified.

scholarly journals Geopolymer Based on Mechanically Activated Air-cooled Blast Furnace Slag

Materials ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1134 ◽  
Author(s):  
Ilda Tole ◽  
Magdalena Rajczakowska ◽  
Abeer Humad ◽  
Ankit Kothari ◽  
Andrzej Cwirzen
Keyword(s):  
Compressive Strength ◽  
Blast Furnace ◽  
Portland Cement ◽  
Sodium Silicate ◽  
Blast Furnace Slag ◽  
Ball Mill ◽  
Efficient Solution ◽  
Building Materials ◽  
Furnace Slag ◽  
Alkali Activated

An efficient solution to increase the sustainability of building materials is to replace Portland cement with alkali-activated materials (AAM). Precursors for those systems are often based on water-cooled ground granulated blast furnace slags (GGBFS). Quenching of blast furnace slag can be done also by air but in that case, the final product is crystalline and with a very low reactivity. The present study aimed to evaluate the cementitious properties of a mechanically activated (MCA) air-cooled blast furnace slag (ACBFS) used as a precursor in sodium silicate alkali-activated systems. The unreactive ACBFS was processed in a planetary ball mill and its cementing performances were compared with an alkali-activated water-cooled GGBFS. Mixes based on mechanically activated ACBFS reached the 7-days compressive strength of 35 MPa and the 28-days compressive strength 45 MPa. The GGBFS-based samples showed generally higher compressive strength values.

Chemical Activation of Cementing Properties of Granulated Blast Furnace Slags

2012 ◽  
Vol 454 ◽  
pp. 11-16
Author(s):  
Xian Jun Lu ◽  
Shu Gang Hu ◽  
Zi Qiao Jin
Keyword(s):  
Blast Furnace ◽  
Portland Cement ◽  
Amorphous Materials ◽  
Chemical Activation ◽  
Xrd Analysis ◽  
Hydration Products ◽  
X Ray ◽  
Early Strength ◽  
Activated Slag ◽  
Alkali Activated

Using CaO, NaOH and Na2CO3 as activators, the effects of dosage and combination of the activators on the cementing property of granulated blast furnace slags were investigated, and the hydration products of the activated slags were detected by X-ray powder diffraction (XRD) analysis. Results indicate that CaO can be used as an effective activator for the slag samples and its optimum dosage is about 10%, but the CaO activated slags shows much lower early strength than the Portland cement. However, the early strength of the CaO activated slag can be remarkably improved by the addition of NaOH or Na2CO3. Under the addition of about 6% NaOH or Na2CO3, the overall compressive strength of the alkali activated slag is higher than a 42.5MPa Portland cement. XRD analysis revealed that the hydration products of the alkali activated slags are mainly amorphous materials, which is quite different from that of the Portland cement.

scholarly journals Mechanical and durability properties of alkali-activated mortar based on sugarcane bagasse ash and blast furnace slag

2015 ◽  
Vol 41 (10) ◽  
pp. 13012-13024 ◽  
Author(s):  
Adriana Pereira ◽  
Jorge L. Akasaki ◽  
José L.P. Melges ◽  
Mauro M. Tashima ◽  
Lourdes Soriano ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Sugarcane Bagasse ◽  
Blast Furnace Slag ◽  
Durability Properties ◽  
Sugarcane Bagasse Ash ◽  
Furnace Slag ◽  
Alkali Activated

scholarly journals Modification of Alkali Activated Blast Furnace Slag for Pothole Repairs

2019 ◽  
Vol 274 ◽  
pp. 04003
Author(s):  
Minna Sarkkinen ◽  
Kauko Kujala ◽  
Seppo Gehör
Keyword(s):  
Blast Furnace ◽  
Portland Cement ◽  
Blast Furnace Slag ◽  
Negative Impact ◽  
Positive Impact ◽  
Optimization Method ◽  
Strength Development ◽  
The Impact ◽  
Furnace Slag ◽  
Alkali Activated

Potholes denote small, typically sharp edged holes in the pavement. The aim of this research was to study the usability of alkali activated (AA) blast furnace slag based material in the repair of paved roads, especially during the cold winter and spring seasons when such repairs are needed most and the use of hot asphalt is not possible. The objective was to a find material which is both more cost-efficient and durable than plain cold asphalt. Properties like rapid strength development, good bonding with old paving material, weather resistance, abrasion resistance, and low shrinkage were required. The influence of the chosen factors on the performance of the material was studied applying the multi-attribute optimization method. The impact of different additives, such as Portland cement, fibers and crushed tire rubber were studied. The results indicated that the AA slag based materials studied can be improved by suitable additives to make them reach desired performance. According to the tests, adding Portland cement increased compressive strength threefold after 3 hours and reduced shrinkage by 34% but should be a negative impact on higher levels related to freeze-thaw resistance. In addition, crushed rubber was indicated to have a positive impact related to all the studied performance properties.

Verification of Durability Properties of Alkali-Activated Materials Based on Blast Furnace Slag with Fly Ash

2020 ◽  
Vol 309 ◽  
pp. 93-97
Author(s):  
Lukáš Procházka ◽  
Jana Boháčová
Keyword(s):  
Blast Furnace ◽  
Fly Ash ◽  
Power Plant ◽  
Blast Furnace Slag ◽  
Durability Properties ◽  
Furnace Slag ◽  
Alkali Activated

The paper deals with the possibility of using fly ash, including fly ash after denitrification by SNCR method, from the Třebovice power plant as an admixture to mixtures based on alkali-activated blast furnace slag in order to improve selected physical, mechanical and durability properties.

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