Sulfate corrosion of portland cement-pure and blended with 30% of fly ash

Djuric, M.; Ranogajec, J.; Omorjan, Radovan; Miletic, Sasa

doi:10.1016/0008-8846(96)00127-5

Cited by 29 publications

(13 citation statements)

References 7 publications

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“…In short, the water retention capacity and the flexural strength of the bricks showed positive changes with the simultaneous addition of fly ash and acidic process waste water into brick material when compared to the standard bricks composed of clay alone. These findings are in a good agreement with the findings of other work in the literature [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27]. Among these studies, for example, Kute and Deodhar [22] showed that the compressive strength of bricks baked at a certain temperature can be improved by 4-5 times for some proportions of fly ash.…”

Section: Water Absorption Capacity and Flexural Strengthsupporting

confidence: 90%

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Encapsulating fly ash and acidic process waste water in brick structure

Köseoğlu

Polat

2010

Journal of Hazardous Materials

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a b s t r a c tFly ash contains metals such as cadmium, iron, lead, aluminum and zinc in its structure in appreciable amounts. These metals can leach out into surface and ground waters if fly ash is not properly disposed of. A similar problem also exists for acidic process waste waters discharged by numerous industries. The purpose of this study was to utilize such wastes as additives in the production of construction quality bricks for the purpose of waste elimination. The bricks produced were subjected to flexural strength and water retention capacity tests along with heavy metal leaching experiments in order to determine the applicability of the procedure and the best possible recipes. This paper summarizes the results obtained in these tests along with the possible mechanisms involved in stabilizing the two wastes in the brick structure.

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Section: Water Absorption Capacity and Flexural Strengthsupporting

confidence: 90%

“…There is also a large body of work on the utilization of fly ash in cement and brick production [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26]. These studies mainly focus on the effect of fly ash addition on the structural behaviour of the final products.…”

Section: Introductionmentioning

confidence: 99%

Encapsulating fly ash and acidic process waste water in brick structure

Köseoğlu

Polat

2010

Journal of Hazardous Materials

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“…Neither detailed reaction mechanisms nor the possible sulphate concentration threshold for occurrence of corrosive reactions were given in King and Vita-Finzi's work (1981), however. Sulphates are well known to be reactive to calcium hydroxide, calcium aluminate hydrate and steels or alloys in concrete (e.g., Djuric et al, 1996;Corvo et al, 1997;Al-Amoudi, 1998;Laitinen, 2000), but they are not as corrosive to silicates and carbonates in sediments. On the other hand, sulphuric acid is a common product of organic-related reductive processes in sediments (Berner, 1971).…”

Section: Discussionmentioning

confidence: 99%

Role of fluids in surface deformation caused by the 1999 Chi‐Chi earthquake in Taiwan

Jean

Liu

Jiang

et al. 2002

Earth Surf Processes Landf

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The 1999 Chi-Chi earthquake significantly altered the landscape of central Taiwan. Surface deformation produced by the earthquake along the trace of the Chelungpu thrust can be classified into two styles: (1) uplift without significant surface rupture, and (2) uplift accompanied by surface rupture. Here we examine areas that exhibited the first style of deformation (e.g. Wufeng). Seismic stress at the time of the main shock may have been relieved by high pore-fluid pressure in a 300-m-thick sand and gravel aquifer. Along the thrust fault, frictional heating of these sediments resulted in thermal expansion and an increase in pore-fluid pressure. High pore-fluid pressure damped seismic-wave energy and enhanced intergranular slips of unconsolidated sandy and gravel sediments, which were possibly assisted by sulphuric acid corrosion, leading to a high sulphate content in the groundwater (c. 70 mg L 1 ). These changes permitted surface folding and terracestyle uplifting to occur without significant rupture. In contrast, other areas in which the second style of deformation is dominant (e.g. Fengyuen-Shihkang) have thin (0-10 m) sand and gravel deposits and lower concentrations of sulphate (c. 30 mg L 1 ) in groundwater. In these areas, sediments were heated but not sufficiently to produce significant thermal expansion and increase in pore-fluid pressure; accumulation of stress in these locations led to rupture at the ground surface, with the formation of steep fault scarps. The areas exhibiting the first deformation style are characterized by the presence of high pore-fluid pressure, frictional heat conduction, and possibly chemical corrosion related to sulphuric acid attack and formation of sulphate, in contrast to those involving significant uplift and surface rupture. The areal distribution of these two surface deformation styles suggests that the aforementioned fluid-related subsurface processes may have altered the characteristics of sediments and caused diverse responses to the quake.

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“…Sulfate contamination of groundwater or surface waters is associated with aesthetic problems (bad odor), and may cause diarrhea (e.g., EPA, 1999). It is also associated with other issues such as corrosion of plumbing systems (e.g., Djuric et al, 1996) and enhanced methylation of mercury leading to accumulation of mercury in fish when released into surface water (e.g., Jeremiason et al, 2006). …”

Section: Introductionmentioning

confidence: 99%

Characterization and quantification of groundwater sulfate sources at a mining site in an arid climate: The Monument Valley site in Arizona, USA

Miao

Carroll

Brusseau

2013

Journal of Hydrology

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The Monument Valley site, a former uranium mining site located in the state of Arizona in the Southwest USA, has high concentrations of sulfate in groundwater. Stable isotope analysis of S and O for sulfate, in combination with geochemical and hydrogeological data, was used to characterize the sources and fate of sulfate. The results indicate the existence of two discrete sources of sulfate (in excess of baseline levels): sulfuric acid released during ore processing and sulfate generated via sulfide-mineral oxidation. The contributions of the sources are related to spatial distributions of sulfate in the plume through analysis of groundwater travel times. Quantification of the sources using two isotope-analysis methods yielded similar results. The results indicate that sulfuric acid served as the primary source (mean = 427 mg/L, 74%), with sulfide-mineral oxidation providing a smaller contribution (mean = 147 mg/L, 26%). It appears that the major contribution to the sulfide-mineral oxidation component originates from oxidation of sulfide minerals in exposed bedrock residing in the primary recharge zone of the local aquifer, which provides an elevated sulfate background for groundwater. Conversely, the oxidation of sulfide minerals associated with the mine tailings appears to provide a relatively minor contribution (∼8% of the overall total). Interestingly, it appears that sulfuric acid served as a sustained source of sulfate for approximately 40 years. This may be related to the accumulation of sulfate salts (formed after neutralization and disposal of the sulfuric acid) in the source zone due to the arid climate of the site. Contrary to the typical assumption applied at many mining sites that sulfide-mineral oxidation is the primary source of sulfate, these sulfate salts are hypothesized to be the primary source for this site.

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Sulfate corrosion of portland cement-pure and blended with 30% of fly ash

Cited by 29 publications

References 7 publications

Encapsulating fly ash and acidic process waste water in brick structure

Encapsulating fly ash and acidic process waste water in brick structure

Role of fluids in surface deformation caused by the 1999 Chi‐Chi earthquake in Taiwan

Characterization and quantification of groundwater sulfate sources at a mining site in an arid climate: The Monument Valley site in Arizona, USA

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