concrete deterioration caused by sulfuric acid attack

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Concrete Deterioration Caused by Sulfuric Acid Attack

concrete deterioration caused by sulfuric acid attack will proceed at a greater rate than that predicted from the square root relationship. Hence in this study concrete deterioration caused by sulfuric acid attack was investigated considering the effects of the flow of acid solution over the surface of concrete

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Concrete Deterioration Caused by Sulfuric Acid Attack ...

Recently, biological deterioration of concrete in sewage and wastewater treatment plants has been reported. This deterioration is caused by sulfuric acid attack and is dependent on the ...

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Sulphuric Acid Attack on Concrete Tanks

sulphuric acid (H 2SO 4) as shown in Equation 1 (Metcalf and Eddy, 2003). Figure 1 Sulphur attack in pump chamber causes the concrete to corrode and the concrete changes to soft gypsum. This type of concrete deterioration is also known as “crown rot” S2-+ H 2O + CO 2 H 2S H 2SO 4 (Equation 1) Organic matter + SO 4 2-S2-+ 2H+ H 2S + 2 O 2 ...

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Biogenic Sulfuric Acid Attack and Case Studies

general acid attack from BSA-caused acid attack. A third concrete core from the project exhibited no deterioration to a minimal deterioration layer that was typically less than 2 mm (0.08 in.) thick in the cell concrete, based on the visual examination. The exposure condition for this concrete core is not known. Localized variations in depths of

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Acid Attack - Mechanism

A more aggressive and destructive case of acid attack occurs when concrete is exposed to sulfuric acid. The calcium salt produced by the reaction of the sulfuric acid and calcium hydroxide is calcium sulfate which in turn causes an increased degradation due to sulfate attack. This process is illustrated below. H 2 SO 4 + Ca(OH) 2 Ca(SO) 4 + 2H 2 O

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Acid Attack on Concrete - Effects Results of Acid Attack ...

Feb 14, 2017  Note that the aggression of the acid attack is not only because of its pH value but also due to the presence of CO 2 in relation with the hardness of water.. Effect of Sulphuric Acid on Concrete: Sulphuric acid attack causes extensive formation of gypsum in the regions close to the surfaces, and tends to cause disintegration and mechanical stresses which ultimately lead to spalling

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Response of Concrete to Sulfuric Acid Attack

The degree of concrete deterioration is increased by alternate wet-dry cycles of exposure to sulfuric acid. The rate of concrete deterioration along the depth of penetration of sulfuric acid could be described by a variation in sulfur concentration with the depth of acid penetration.

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DETERIORATION OF CONCRETE DUE TO ACID ATTACK

concrete, and the concrete dome of the Pantheon is world's largest unreinforced concrete dome. concrete structures (perhaps, dams and multi-story car parks) are usually complete by reinforced concrete. After the Roman Empire collapsed, usage of concrete became rare until the DETERIORATION OF CONCRETE DUE TO ACID ATTACK Alamanda.

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TECHNICAL PAPER SULFURIC ACID RESISTANCE OF STRAIN ...

loss caused by acid exposure [1-4]. Since the biogenic sulfuric acid attack is one of the main deterioration mechanisms of concrete wastewater facilities [5-8], the high acid resistance of geopolymer concrete seems promising for improving durability of wastewater infrastructure.

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Identification of acid attack on concrete of a sewage ...

Aug 11, 2011  The surface of concrete in sewer concrete elements is frequently deteriorated when the atmosphere contains a high quantity of hydrogen sulfide in consequence of a process designated as biogenic sulphuric acid attack (BSA) [23, 28]. The bacterial and chemical activity in this type of environment leads to a sulphur cycle resulting in the ultimate ...

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Study on Concrete Properties under Acid Attacks

Sulfuric acid [H2 (SO4)] attack on concrete may be characterized by a chemical reaction between the acidic media and cement hydration products and, if soluble, the aggregate particles, results in excessive formation of gypsum (Fig. 2.1). The nature of attack of sulfuric acid on concrete is manifold. Acid attack can occur under static or flowing

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Effect of sulphuric acid on plasticized concrete

sulphuric acid can also occur in industrial environments resulting in localised deterioration of concrete. Acid rain; in which sulphuric acid is an important component, can affect long term durability of concrete structures exposed to the atmosphere. Another source of severe sulphuric acid attack encountered is sewage systems.

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BEHAVIOUR THE CONCRETE UNDER SEVERAL

the concentrations of the sulphuric acid in water to achieve the much higher-quality acid resistant cementations materials [1, 2]. Usually experimental studies on concrete deterioration due to sulfuric acid attack are performed using specimens statically immersed in acid solutions. In this case, concrete

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ACID ATTACK IN CONCRETE - insaat.eskisehir.tr

acid attack on concrete generally, an increase in temperature will lead to an increase in the rate of deterioration as a result of acid attack. this is primarily due to an increase in the solubility of the salts formed. however, where salts possess a negative partial molar enthalpy of solution and thus become less

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Investigation on the Sulfuric Acid Corrosion Mechanism for ...

Being different from the mechanism of sulfate attack on concrete [11, 12, 18, 19], the sulfuric acid corrosion mechanism for concrete is the result of a combined action of dissolved corrosion caused by hydrogen ion (H +) and expanded corrosion caused by SO 4 2− (sulfate ion) .

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Types and Causes of Concrete Deterioration

the most common cause of concrete deterioration. (46080) Steel Corrosion by-products (rust) Fig. 2. The expansion of corroding steel creates tensile stresses in the concrete, which can cause cracking, delamination, and spalling. 4e-4e-4OH-2Fe+ 2Fe(OH) 2 2H 2O 2H 2O O 2 O 2 Fe 2O 3•H 2O Secondary Anode Cathode Fig. 3. When reinforcing steel ...

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External Sulfate Attack Concrete Experts International

It is also produced by acid attack (sulfuric acid) on concrete. Hydration: Reaction between cement and water, producing cement gel (cement paste, cement glue) serving as an adhesive in the concrete. Mono-sulfate: 3CaO.Al2O3.CaSO4.12H2O. Plastic shrinkage: Shrinkage caused by strong drying of newly cast concrete. The result is often plastic ...

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Deterioration of Concrete Caused by Complex Attack in ...

These substances react with concrete through different mechanisms and lead to the deterioration of concrete and corrosion of the reinforcement. Most of the publications have focused on a biogenic sulfuric acid attack on concrete exposed to sewage, and not many authors have considered other aggressive phenomena, such as chloride diffusion and ...

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Study of Effect of Chemicals (Acid) Attack on Strength and ...

sulfuric acid. Concrete cylinder specimens were immersed in various concentrations of sulfuric acid. Also, sulfuric acid was circulated over the surface of concrete. It was found that the rate of concrete deterioration caused by sulfuric acid depended on pH value of acid solutions. Also, time of exposure of concrete to acid plays a crucial role ...

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(PDF) Resistance of different types of concretes to cyclic ...

Resistance of different types of concretes to cyclic sulfuric acid and sodium sulfate attack. Cement and Concrete Composites, 2010. F. Girardi. W. Vaona. F. Girardi. W. Vaona. Download PDF. Download Full PDF Package. This paper. A short summary of this paper. 37 Full PDFs related to this paper.

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