scholarly journals Dynamic Properties of Non-Cement Matrix Based on Blast Furnace Slag and Polysilicon Sludge Ratio and Addition Rate of Alkali Activator

2015 ◽  
Vol 27 (11) ◽  
pp. 4204-4206
Author(s):  
Jeonggeun Lim ◽  
Sangsoo Lee
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Dynamic Properties ◽  
Cement Matrix ◽  
Alkali Activator ◽  
Addition Rate ◽  
Furnace Slag

Durability Performance of Cement Composites Containing Ground Granulated Blast Furnace Slag

2015 ◽  
Vol 1105 ◽  
pp. 26-30
Author(s):  
Martina Kovalcikova ◽  
Adriana Eštoková ◽  
Alena Luptáková
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Calcium Release ◽  
Experimental Studies ◽  
Concrete Mixture ◽  
Cement Matrix ◽  
Acidithiobacillus Thiooxidans ◽  
Granulated Blast Furnace Slag ◽  
Calcium Compounds ◽  
Furnace Slag

The hydraulic properties of granulated blast-furnace slags have been studied for nearly 200 years, and use of slag in mortars and concretes dates back more than a hundred years. The use of ground blast furnace slag, added as a replacement for a portion of the portland cement, has gained increasing acceptance in recent years. The effects of sulphur-oxidizing bacteria Acidithiobacillusthiooxidans on concrete mixture with addition of ground granulated blast furnace slag compared to mixture without any additives were investigated in laboratory over a period of 91 days. A laboratory study was conducted to comparison the performance of concrete samples in terms of a concrete deterioration influenced by the leaching of calcium compounds from the cement matrix. The changes in the elemental concentrations of calcium ions in leachates were measured by using X – ray fluorescence method. Experimental studies confirmed: bacteria Acidithiobacillus thiooxidans caused much intensive calcium release from the concrete matrices into the solution; the higher resistance of concrete mixture with 65 % wt. slag addition was not confirmed.

Magnesium alloys and graphite wastes encapsulated in cementitious materials: reduction of galvanic corrosion using alkali hydroxide activated blast furnace slag

MRS Advances ◽  
2016 ◽  
Vol 1 (62) ◽  
pp. 4095-4101
Author(s):  
D. Chartier ◽  
B. Muzeau ◽  
L. Stefan ◽  
J. Sanchez-Canet ◽  
C. Monguillon
Keyword(s):  
Blast Furnace ◽  
Hydrogen Production ◽  
Magnesium Alloys ◽  
Blast Furnace Slag ◽  
Spent Nuclear Fuel ◽  
Electrical Contact ◽  
Cementitious Materials ◽  
Cement Matrix ◽  
Furnace Slag ◽  
Alkali Hydroxide

ABSTRACTMagnesium alloys (Mg-0.5%Zr and Mg-1.2%Mn) and graphite from spent nuclear fuel that has been used in the former French gas cooled reactors, have been stored together in AREVA La Hague plant. The recovery and packaging of these wastes is currently studied and several solutions are under consideration. One of the developed solutions would be to mix these wastes in a grout composed of industrially available cement, e.g. OPC, OPC blended with blast furnace slag or aluminous cement. Within the alkaline pore solution of these matrixes, magnesium alloys are imperfectly protected by a layer of magnesium hydroxide (Mg(OH)2, Brucite) resulting in a slow process of corrosion releasing hydrogen. As the production of this gas must be considered for the storage safety, and the quality of wasteform, it is important to select a cement matrix capable of lowering the corrosion kinetics of magnesium alloys. This is especially true when magnesium alloys are conditioned together with graphite wastes. Indeed, galvanic coupling phenomena may increase early age corrosion of the mixed wastes, as magnesium and graphite will be found in electrical contact in the same electrolyte. Many types of cements have been tested and most of them have caused strong hydrogen production when magnesium alloys and graphite are conditioned together into such cement pastes. Exceptions are geopolymer binder which is already known for that and another binder based on alkali hydroxide activated ground granulated blast furnace slag (AHABFS) which is presented in the present article. First are presented hydrogen production experiments that demonstrate the efficiency of AHABFS towards reduction of corrosion of Mg alloys embedded. In a second part, a formulation of fluid mortar based on this binder is proposed.

scholarly journals Effect of Electrolyzed Alkaline-Reduced Water on the Early Strength Development of Cement Mortar Using Blast Furnace Slag

Materials ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 4620
Author(s):  
Taegyu Lee ◽  
Suna Kim ◽  
Sun-Gyu Park
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Cement Matrix ◽  
Strength Development ◽  
Replacement Ratio ◽  
Large Blast ◽  
Large Blast Furnace ◽  
Alkaline Activator ◽  
Furnace Slag ◽  
Reduced Water

This study evaluated the use of electrolyzed alkaline-reduced water instead of an alkaline activator for the production of a strong cement matrix with a large blast furnace slag replacement ratio. The flexural and compressive strength measurements, X-ray diffraction analysis, and scanning electron microscopy images of the cement matrices produced using electrolyzed alkaline-reduced water and regular tap water, and with blast furnace slag replacement ratios of 30 and 50% were compared to a normal cement matrix. The cement matrix produced using electrolyzed alkaline-reduced water and blast furnace slag exhibited an improved early age strength, where hydrate formation increased on the particle surface. The cement matrix produced using electrolyzed alkaline-reduced water exhibited a high strength development rate of over 90% of ordinary Portland cement (OPC) in BFS30. Therefore, the use of electrolyzed alkaline-reduced water in the place of an alkaline activator allowed for the formation of a very strong cement matrix in the early stages of aging when a large blast furnace slag replacement ratio was used.

The Ability of Slag-Portland Cement Composites to Withstand Aggressive Environment

2015 ◽  
Vol 244 ◽  
pp. 88-93
Author(s):  
Martina Kovalcikova ◽  
Adriana Eštoková ◽  
Alena Luptáková ◽  
Julius Strigac
Keyword(s):  
Blast Furnace ◽  
Portland Cement ◽  
Blast Furnace Slag ◽  
Concrete Specimen ◽  
Partial Replacement ◽  
Cement Matrix ◽  
Acidithiobacillus Thiooxidans ◽  
Aggressive Environment ◽  
Granulated Blast Furnace Slag ◽  
Furnace Slag

The use of separately ground blast-furnace slag, added at the mixer as a replacement for a portion of the Portland cement, has gained increasing acceptance in recent years. The effects of partial replacement of Portland cement with ground slag on the properties of hardened concrete have been extensively investigated and reported. Both laboratory testing and field experience have shown that properly proportioned slag-Portland cement concretes have the improved resistance to sulfates and seawater compared to regular Portland mixes. The paper is focused on the effects of sulfur-oxidizing bacteria Acidithiobacillus thiooxidans on concrete mixtures with addition of ground granulated blast furnace slag compared to mixture without any additives. The concrete specimens with 65 and 75 % wt. addition of antimicrobial activated granulated blast furnace slag as durability increasing factor as well as without any addition were investigated in laboratory during the nine 7-day cycles. A laboratory study was conducted to comparison the performance of concrete samples in terms of a concrete deterioration influenced by the leaching of calcium and silicon compounds from the cement matrix. The changes in the elemental concentrations of calcium and silicon ions in leachates were measured by using X – ray fluorescence method. The pH values were measured and evaluated after each cycle. The concrete specimen with 65 % wt. addition of antimicrobial activated granulated blast furnace slag was found to have the best leaching performance of calcium ions than other samples. The final concentration of Si ions in leachate of concrete specimen with 75 % wt. addition of antimicrobial activated granulated blast furnace slag affected with bacteria Acidithiobacillus thiooxidans (4.614 mg/g of concrete sample) was observed to be 1.263 times lower than reference sample without any additives. The higher resistance of concrete samples with the addition of antimicrobial activated granulated blast furnace slag to the aggressive environment was confirmed.

A Study on the Strength and Flowing Properties of the Non-Cement Inorganic Composite by Using Blast Furnace Slag and Red Mud

2011 ◽  
Vol 261-263 ◽  
pp. 491-495 ◽  
Author(s):  
Sang Soo Lee ◽  
Ha Young Song ◽  
Yun Seong Lee ◽  
Kang Pil Lee
Keyword(s):  
Blast Furnace ◽  
Red Mud ◽  
Blast Furnace Slag ◽  
National Policy ◽  
Physical Property ◽  
Green Growth ◽  
Addition Rate ◽  
Furnace Slag ◽  
Fundamental Experiment ◽  
Inorganic Composite

Recently, as the national policy of green growth is promoted, construction field also makes an effort to reduce CO2 gas released when producing cement continuously. In other words, as the method solving environmental pollution and resources exhaustion, lots of mineral material compounds such as blast furnace slag which is industrial by-product, fly ash, red mud, etc. are examined to be used as the substitute good of cement. Therefore, this study intended to supplement the weaknesses of blast furnace slag and red mud with blast furnace slag and red mud, as the substitute good of cement, not concrete compound, manufacture inorganic composite of cement world, which can be made with only alkali accelerator at normal temperature, without high-temperature plasticity. After confirming kinds of red mud and alkali liquids and physical property by the change of addition rate with fundamental experiment, proper mix was drawn by combining blast furnace slag.

Sign in / Sign up

Export Citation Format

Share Document