The Influence of Finely Ground Limestone in the Design of Concrete for White Boxes Regarding the Suppression of Shrinkage

2021 ◽  
Vol 321 ◽  
pp. 119-124
Author(s):  
Lucia Osuská ◽  
Milan Meruňka ◽  
Rudolf Hela
Keyword(s):  
Blast Furnace ◽  
Water Absorption ◽  
Blast Furnace Slag ◽  
High Water ◽  
Concrete Mixture ◽  
Volume Changes ◽  
Minimal Volume ◽  
Furnace Slag ◽  
Ground Limestone

For concrete constructions built as underground spaces, basements or cellars, it is necessary for these constructions to be able to resist the influence of groundwater pressure that could disrupt the compactness of the entire construction by its action. For this reason, constructions of so-called white boxes are often used. White boxes are concrete constructions whose main capability is high water impermeability, exhibiting at the same time minimal volume changes. These properties could be accomplished by a series of several technological precautions, one of which is the composition of the concrete mixture itself. The aim of this paper is to evaluate the influence of finely ground limestone and the latent hydraulic addition of finely ground blast furnace slag on the properties of concrete composite such as water impermeability, water absorption, or volume changes. These properties are vital for the construction of white boxes. In this paper, the suitability of the mutual combination of active and internal additive will also be evaluated.

scholarly journals Alkali-activated concretes based on fly ash and blast furnace slag: Compressive strength, water absorption and chloride permeability

2020 ◽  
Vol 40 (2) ◽  
Author(s):  
Daniela Eugenia Angulo-Ramírez ◽  
William Gustavo Valencia-Saavedra ◽  
Ruby Mejía de Gutiérrez
Keyword(s):  
Compressive Strength ◽  
Blast Furnace ◽  
Fly Ash ◽  
Water Absorption ◽  
Blast Furnace Slag ◽  
Construction Materials ◽  
Chloride Ion ◽  
Chloride Permeability ◽  
Alkaline Activator ◽  
Furnace Slag

Concretes based on alkaliactivated binders have attracted considerable attention as new alternative construction materials, which can substitute Portland Cement (OPC) in several applications. These binders are obtained through the chemical reaction between an alkaline activator and reactive aluminosilicate materials, also named precursors. Commonly used precursors are fly ash (FA), blast furnace slag (GBFS), and metakaolin. The present study evaluated properties such as compressive strength, rate of water absorption (sorptivity), and chloride permeability in two types of alkaliactivated concretes (AAC): FA/GBFS 80/20 and GBFS/OPC 80/20. OPC and GBFS/OPC* concretes without alkaliactivation were used as reference materials. The highest compressive strength was observed in the FA/GBFS concrete, which reported 26,1% greater strength compared to OPC concrete after 28 days of curing. The compressive strength of alkaliactivated FA/GBFS 80/20 and GBFS/OPC 80/20 was 61 MPa and 42 MPa at 360 days of curing, respectively. These AAC showed low permeability to the chloride ion and a reduced water absorption. It is concluded that these materials have suitable properties for various applications in the construction sector.

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.

Preliminary Study on Design of Biological Shielding Concrete - Selection of Binder

2016 ◽  
Vol 722 ◽  
pp. 173-177
Author(s):  
Jaroslava Koťátková ◽  
Pavel Reiterman
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Nuclear Power ◽  
Blended Cement ◽  
Nuclear Radiation ◽  
Slag Cement ◽  
Volume Changes ◽  
Preliminary Study ◽  
Furnace Slag ◽  
Selection Of

The preliminary study is targeted at the design of different mixtures of biological shielding concrete for later investigation of the effects of nuclear radiation and heat on its durability. The article deals with the investigation of the properties of cement pastes prepared from two different cement types and the selection of the proper binder for biological shielding concrete. Portland cement CEM I 42.5 R was selected as the representative binder of commonly used binder for shielding concrete (e. g. in the Czech nuclear power plant Temelín) and Portland blast furnace slag cement CEM II/B-S 32.5 was chosen for its anticipated better performance. Mechanical properties and volume changes in time were studied on two sets of samples – stored in laboratory conditions, resp. in water. Results revealed higher flexural strength for pastes made from CEM II/B-S 32.5 for both storage conditions and also slightly higher compressive strength. Higher differences between the values of single samples measured in time referred to a postponed hydration process of the blended cement, which is important for slower heat evolution and lower shrinkage. The measurement of volume changes proved the expected better performance of CEM II/B-S 32.5 in terms of shrinkage. From the obtained results, the Portland blast furnace slag cement CEM II/B-S 32.5 was evaluated as the better alternative for biological shielding concrete binder.

scholarly journals Determining equivalent performance for frost durability of concrete containing different amounts of ground granulated blast furnace slag

2016 ◽  
Vol 64 (4) ◽  
pp. 731-737 ◽  
Author(s):  
J. Wawrzeńczyk ◽  
T. Juszczak ◽  
A. Molendowska
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Water Saturation ◽  
Good Method ◽  
Length Change ◽  
High Water ◽  
Granulated Blast Furnace Slag ◽  
Frost Durability ◽  
Furnace Slag ◽  
Air Entrained Concrete

Abstract This paper deals with the issues pertinent to the design of frost-resistant concretes in exposure class XF3 (high water saturation) when the concretes are made with cements containing ground granulated blast furnace slag (ggbs). The testing programme covered four series of non-air entrained concrete made with cements CEM I, CEM II/A-S, CEM II/B-S and CEM III/A containing 0%, 13%, 28% and 53% ggbs respectively, and two non-air entrained concrete series with the binder made from CEM I and 0 to 55% ggbs. The water-binder (w/b) ratio ranged from 0.25 to 0.55. Frost durability testing was performed using a modified ASTM C666A procedure to determine changes in mass (dm) and beam length (dL). The relationships occurring between the w/b ratio and ggbs content in the binder and the length change (dL) of the specimens were described using curvilinear regression functions, through the analysis of artificial neural networks. Slag-content-dependent critical values of the w/b ratio were determined taking the length change dL = 1.3 mm to be the criterion for the resistance to internal cracking. In the authors’ view, this approach can be a good method for checking equivalent performance of concretes made with cements containing mineral additions.

Characteristics of Mortars with Various Composition of Ground Granulated Blast Furnace Slag

2015 ◽  
Vol 754-755 ◽  
pp. 305-309 ◽  
Author(s):  
Aimi Noorliyana Hashim ◽  
Kamrosni Abdul Razak ◽  
Mohd Mustafa Al Bakri Abdullah ◽  
Noor Mariamadzliza Mohd Nan ◽  
Noor Azira Mohd Noor
Keyword(s):  
Compressive Strength ◽  
Blast Furnace ◽  
Portland Cement ◽  
Water Absorption ◽  
Blast Furnace Slag ◽  
Weight Percent ◽  
High Energy ◽  
Granulated Blast Furnace Slag ◽  
Energy Consuming ◽  
Furnace Slag

The characteristics of mortars made from ordinary Portland cement with various composition of ground granulated blast furnace slag (GGBS) were investigated in this research. Ground granulated blast furnace slag (GGBS) was chose as an alternative binder to partially replace high energy consuming Portland cement in concrete according to the composition of the slag itself. GGBS were blended with Portland cement from 20 to 80 weight percent. The samples were mechanically tested for water absorption and compressive strength after 7, 14 and 28 days. From research, the most suitable proportion is 60% OPC + 40% GGBS which gain the highest compressive strength and the lowest water absorption among OPC blended mortars. These mortars used water to hydrate and solidify with ratio water to binders 0.7 equally.

scholarly journals Mechanical Characteristics and Water Absorption Properties of Blast-Furnace Slag Concretes with Fly Ashes or Microsilica Additions

2019 ◽  
Vol 9 (7) ◽  
pp. 1279 ◽  
Author(s):  
Dora Foti ◽  
Michela Lerna ◽  
Maria Sabbà ◽  
Vitantonio Vacca
Keyword(s):  
Blast Furnace ◽  
Water Absorption ◽  
Blast Furnace Slag ◽  
Experimental Tests ◽  
Absorption Capacity ◽  
Recycled Aggregates ◽  
Environmental Damage ◽  
Fly Ashes ◽  
Furnace Slag ◽  
By Products

The paper shows the results of an experimental tests campaign carried out on concretes with recycled aggregates added in substitution of sand. Sand, in fact, has been totally replaced once by blast-furnace slag and fly ashes, once by blast-furnace slag and microsilica. The aim is both to utilize industrial by-products and to reduce the use of artificial aggregates, which impose the opening of pits with high environmental damage. The results show that in the concretes so made the water absorption capacity has reduced and durability has improved. The test campaign and the results described in the present article are certainly useful and can be especially utilized for research on a larger scale in this field.

Environmental Assessment of the Concrete Based on Blast Furnace Slag

2015 ◽  
Vol 244 ◽  
pp. 213-220 ◽  
Author(s):  
Marcela Ondová ◽  
Vojtech Vaclavik
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Plain Concrete ◽  
Photochemical Oxidation ◽  
Concrete Mixture ◽  
Suitable Alternative ◽  
Aquatic Ecotoxicity ◽  
Mixture Density ◽  
The Impact ◽  
Furnace Slag

The paper deals with the use of blast furnace slag in the production of plain concrete and with its impact on the elements of the environment. The finely ground granulated blast furnace slag with the weight of 10, 20, 30, 40, 50, 60, 80, 95 and 100 % was used as a substitute of Portland cement in ratio 1:1 of weight. The following properties were observed in all prepared experimental mixtures: consistency of concrete mixture, density of fresh concrete mixture, cube and prism strengths, water tightness, frost resistance and static modulus of elasticity. Subsequently, the life cycle assessment as well as the comparison of environmental impact of selected plain concretes by the LCA method was made. They were monitored total environmental impacts in terms of threats to soil, water, air and human health in order to select the most suitable alternative. The comparison of the reference mixture and mixture with 60% wt. of blast furnace slag showed that using secondary raw materials visibly decreased the impact in each category: Abiotic depletion of 56%; Acidification of 52%; Eutrophication of 56%; Global warming of 58%; Ozone layer depletion of 50%; Terrestrial ecotoxicity of 59%; Photochemical oxidation of 50%, Primary energy (non-renewable fossil) of 53% and of 58% for Human toxicity, Fresh water aquatic ecotoxicity and Marine aquatic ecotoxicity, respectively.

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