Durability of Mortars Containing Ground Granulated Blast-furnace Slag in Acid and Sulphate Environment

Łukowski, P.; Salih, Ali I.

doi:10.1016/j.proeng.2015.06.118

Cited by 39 publications

(10 citation statements)

References 7 publications

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“…However, after 84 or 140 days of samples exposure to the sulphate solution, the porous space was fully filled by the newly formed substances, and the harmful crystallization pressures decreased the mechanical resistivity of resear-ched mortars. Similar performance of cement-based plaster observed e.g., Łukowski and Salih [44] who studied durability of PC mortars in acid and sulphate environment. The decrease in compressive strength was visible for all the studied materials except mortar CE6 that maintained its excellent mechanical properties even after 168 days exposure to the sulphate environment.…”

Section: Resultssupporting

confidence: 76%

The Effect of the Sodium Sulphate Solution Exposure on Properties and Mechanical Resistance of Different Kinds of Renders

Pavlíková¹

2018

Ceramics - Silikaty

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The effect of 5 % water solution of the sodium sulphate and the reference environment of distilled water on changes in mechanical resistance of the commercial dry render mixes was researched in the paper. The prism-shaped specimens cured 28 days in humid and stable conditions were immersed in water or sodium sulphate water solution. At chosen time, the particular specimens were collected, dried to constant mass, and subjected to tests. The maximum time of specimen exposure to moisture or salt action was 168 days. Within the performed experiments, length changes, mass gain, mechanical and basic properties were measured in order to reveal the effect of sulphate corrosion on researched materials. Additionally, pore size distribution measurement and X-Ray CT analysis for the most damaged render were done, in order to characterize the disruptive impact of sulphate solution on porous microstructure of lime-metakaolin-based render. The obtained data revealed the high capacity of porous space of the tested renders for salt storage. For shorter times of exposure to salt action, most of the studied renders exhibited improvement in mechanical resistance. On the other hand, after the full filling of the porous space, the evoked crystallization pressures led to the decrease in mechanical resistance and materials damage. However, one type of studied renders originally designed for restoration of salt laden masonry maintained its excellent mechanical properties even after 168 days of sulphate exposure.

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Section: Resultssupporting

confidence: 76%

The Effect of the Sodium Sulphate Solution Exposure on Properties and Mechanical Resistance of Different Kinds of Renders

Pavlíková¹

2018

Ceramics - Silikaty

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“…Due to pozzolanic property, the use of mineral admixtures that decreases the CH content of the cement paste and results in dilution of calcium aluminate hydrate can improve sulphate resistance (11,14,17,18). Composite cements containing pozzolanic materials also create a more compact structure with lower permeability compared to ordinary Portland cement that causes the diffusion of invasive ions into hydration products to be more difficult (1,19).…”

Section: Sulphate Attack Overviewmentioning

confidence: 99%

A composite cement of high magnesium sulphate resistance

2018

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This study investigates the magnesium sulphate resistance of chemically activated phosphorus slag-based composite cement (CAPSCC). Enough mortar specimens were prepared from phosphorus slag (80 wt.%), type II Portland cement (14 wt.%), and compound chemical activator (6 wt.%) and were exposed to 5% magnesium sulphate solution after being cured. Mortar specimens of both type II and V Portland cements (PC2 and PC5) were also prepared and used for comparison purpose. According to the test results, after 12 months of exposure, PC2, PC5 and CAPSCC exhibited 43.5, 35.2 and 25.2% reduction in compressive strength, 0.136, 0.110, and 0.026% expansion in length, and 0.91, 2.2, and 1.78% change in weight, respectively. Complementary studies by X-ray diffractometry and scanning electron microscopy revealed that CAPSCC has a very low potential for the formation of sulphate attack products, especially ettringite. The results confirm a high magnesium sulphate resistance for CAPSCC compared to PC2 and PC5. RESUMEN:Cemento compuesto de alta resistencia al sulfato de magnesio. Este trabajo aborda el estudio de la resistencia al sulfato de magnesio de un cemento compuesto con base de escoria de fósforo activada química-mente (CAPSCC). Se prepararon muestras de mortero a partir de escoria de fósforo (80% en peso), cemento Portland tipo II (14% en peso) y activador químico (6% en peso) y tras el curado, se expusieron a una solución de sulfato de magnesio al 5%. También se prepararon morteros de cementos Portland de tipo II y V (PC2 y PC5) que se usaron con fines comparativos. De acuerdo a los resultados obtenidos, después de 12 meses de exposición, PC2, PC5 y CAPSCC mostraron un 43.5, 35.2 y 25.2% de reducción en la resistencia a la compresión, 0.136, 0.110, y 0.026% de expansión en longitud, y 0.91, 2.2 y 1.78% de cambio en peso, respectivamente. Estudios complementarios por difracción de rayos X y microscopía electrónica de barrido revelaron que los cementos CAPSCC tienen un potencial muy bajo para la formación de productos de ataque de sulfato, especialmente etringita. Los resultados confirman una alta resistencia al sulfato de magnesio para CAPSCC en comparación con PC2 y PC5

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“…Common mineral admixtures that are been extensively used as SCM are PFA and GGBS of adequate quality. PFA is a by-product collected from electrostatic precipitation of flue gases released during the combustion of coal at coal thermal power stations, while GGBS is processed from molten slag which is a by-product of pig iron blast furnace production and is predominantly composed of non-metallic residue such as quick lime, silica and alumina [5]. According to [6], more than 90% of the GGBS currently produced globally is being used either for the production of blended cement or as SCM.…”

Section: Introductionmentioning

confidence: 99%

Effects of ground granulated blast furnace slag and pulverized fuel ash on rheology of concrete

Bature¹,

Khorami²,

Lawan³

2020

Nig. J. Tech.

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The rheology of concrete containing Pulverized Fuel Ash (PFA) and Ground Granulated Blast Furnace Slag (GGBS) has been scarcely studied and reported, despite their increase application as Supplementary Cementitious Materials (SCM) that drives improvement of sustainability of the construction industry. This work studied the effect of these SCMs and Superplasticizer proportions on rheological properties of concrete using rate controlled concrete rheometer. Two groups of mixes containing replacement or addition on mass basis using either PFA or GGBS or their combinations were derived from the control mix. The dynamic yield stress, plastic viscosity and 28 day compressive strength of the control mix are 1258 Pa, 6 PaS, and 40.5 MPa respectively. The results of the rheology tests of the various binary mixes (PFA and Portland cement) and ternary mixes (Portland cement, PFA and GGBS) structural concrete shows wide disparity in the measured rheological parameters. The results show that the decrease in dynamic yield stress of the ternary mix containing 20% GGBS is 4.1%, whereas the decrease in dynamic stress of the ternary mix containing 20% PFA is 35.9% compared to the control ternary mix. The high volume Portland cement replaced ternary concrete can therefore be effectively characterized as a workable and pumpable concrete. Keywords: Rheology, PFA, GGBS, superplasticizer, concrete.

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Durability of Mortars Containing Ground Granulated Blast-furnace Slag in Acid and Sulphate Environment

Cited by 39 publications

References 7 publications

The Effect of the Sodium Sulphate Solution Exposure on Properties and Mechanical Resistance of Different Kinds of Renders

The Effect of the Sodium Sulphate Solution Exposure on Properties and Mechanical Resistance of Different Kinds of Renders

A composite cement of high magnesium sulphate resistance

Effects of ground granulated blast furnace slag and pulverized fuel ash on rheology of concrete

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