Concrete Deterioration Caused by Sulfuric Acid Attack

INFLUENCE OF SULFURIC ACID ATTACK ON CONCRETE

Influence of sulfuric acid attack on concrete with industrial waste Estokova, A, Smolakova, M The results of chemical reactions and transformations are sulfate attack, corrosion, and deterioration of the pipe material [2]. The consequences of the deteriorated sewers can be economically, The disposal of these wastes cause significant

PDF Evaluation of Coatings and Mortars for Protection of

ferrooxidans produce sulphuric acid which is aggressive towards concrete. Nitrifyingbacteria (e.g., Nitrosomonas and Nitrobacter) can act to cause nitric acid degradation of concrete. As a result of acid attack, concrete loses its functionality and structural integrity may be compromised, particularly if corrosion of steel eventuates.

Biogenic Sulfuric Acid Attack and Case Studies

Title: Biogenic Sulfuric Acid Attack and Case Studies Author(s): Hugh (Xiaoqiang) Hou, Kimberly A. Steiner, John Fraczek, and James A. Mahaney Publication: Concrete International Volume: 42 Issue: 5 Appears on pages(s): 33-38 Keywords: concrete, sulfur, deterioration, corrosion Date: 5/1/ Abstract: Biogenic sulfuric acid attack (BSA) is probably the most common and most severe

Chemical attack - SlideShare

Jan 15,  · Deterioration of sewerage concrete due to acid attack 18. 9/12/ 18 Deterioration of silo due to acid attack Formation of gypsum in wastewater treatment plant 19. 9/12/ 19 Concrete bridge pylons corroded due to acid attack. Corrosion of floodgate resulting from acid attack 20.

CiteSeerX — , ACI MATERIALS JOURNAL TECHNICAL PAPER Title

CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): The response oj four different concrete mixes to sulfuric acid attack was evaluated in an accelerated laboratory test program. Small test specimens cut from standard concrete cylinders and a 1 percent sul-furic acid solution with a pH oj J were used in the test program.

PDF Materil Design of Sulfuric Acid Resistance Material

Recently, the early deterioration of concrete used ordinary Portland cements caused by sulfuric acid attack in sewer becomes a serious problem. Alternative material of ordinary Portland cement is needed to solve this problem. Alumina cement has superior sulfuric acid resistance compared with ordinary Portland cement. However, a

Understanding the Effects of Pyrrhotite in Concrete

to sulfuric acid attack. The sulfuric acid reacts with the calcite in the lime- cause deterioration of concrete is far less common than cases of ASR. 3 ASR, Alkali-silica Reaction Reported ases of ASR. Glossary Ettringite is an important part of the hydration of portland cement

Types and Causes of Concrete Deterioration

Nov 19,  · Most ammonium salts are destructive because, in the alkaline environment of concrete, they release ammonia gas and hydrogen ions. These are replaced by dissolving calcium hydroxide from the concrete. The result is a leaching action, much like acid attack. Strong alkalies (over 20 percent) can also cause concrete disintegration (ACI 515 1979).

Condition Assessment and Finite Element Modelling of a

extensive deterioration of concrete in a short span of time. Although sulfate attack has been recognized as a cause of concrete distress for many years, it remains a controversial, confusing, and complex topic. The sulfuric acid, consequently, reduces the concrete alkalinity, destroying the passivity protecting

PDF Section 14C-3 - Manhole Rehabilitation

Manhole deterioration is a problem that is becoming much more prominent as public infrastructure ages and the number of manholes in service increases. Concrete manholes are often susceptible to attack by sulfuric acid, which eats away at the concrete surface and eventually the steel reinforcing in the manhole, creating the potential for collapse.

ACID ATTACK IN CONCRETE - insaat.eskisehir.edu.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

Study on Strength and Microstructure of Cement Pastes

3) Microstructural analysis manifests on condition of the flowing acetic acid attack, destruction of the microstructure, and loss of the strength are caused by the reactions between calcium hydroxide and the acid which make the deterioration proceed from the exterior to the interior. While under the flowing sulfuric acid attack

PDF Degradation of Concrete Structures and Protective Measures

the type of acid, the attack can be mainly an acid attack, or a combination of acid followed by a salt attack. It cannot cause deterioration in the interior of the specimen without the cement paste on the outer portion being completely destroyed. The rate of penetration is thus inversely proportional to the

Concrete Deterioration Caused by Sulfuric Acid Attack

They reported that the rate of concrete deterioration caused by sulfuric acid attack depends on the acid solutions pH value and the erosion depth of the concrete is proportional to the exposure

Degradation of Concrete Structures and Protective Measures

May 29,  · Depending on the type of acid, the attack can be mainly an acid attack, or a combination of acid followed by a salt attack. It cannot cause deterioration in the interior of the specimen without the cement paste on the outer portion being completely destroyed.

Evaluation of Sulfuric Acid-Induced Degradation of

The deterioration of concrete based on cement was first mentioned in literature in the year 1990 [20]. In several construction applications like biogas plants [21], sewage plants and sewers [22], and cooling towers of power plants [23,24], the deterioration of concrete is caused by sulfuric acid attack. Due to

Current understanding and Future Approaches for

concrete pH to 9.5 which may favour adhesion of microbes [2]. Earlier investigators assumed that hydrogen sulphide formed either by decomposition of organic material or by sulphate reduction in the environment, get oxidized into sulphuric acid, and cause deterioration of concrete [3].

Corrosion prediction using the weight loss model in the

the direct use of sulfuric acid as the corrosive agent. They have shown that concrete does not always provide a good resistance to BSA even though it indicates a certain resistance to sulfuric acid [13]. Some research groups have attempted to examine both the chemical (pure sulfuric acid attack) and bacterial processes of cor-rosion via simulation.

Which acid is used to dissolve cement, and why? - Quora

Concrete is made of a mixture of an aggregate, cement, and water. Aggregates can be one or more of sand, natural gravel, or crushed stone. Once formed, the water reacts with the cement to form a calcium-silicate hydrate with curing. Various additi

ACIDIC CORROSION OF HYDRATED CEMENT BASED

Concrete can be subjected to attack by various inorganic and organic acids including sulfuric, nitric, hydrochloric, phosphoric, acetic, lactic and so on. However sulfuric acid can be considered as the most common cause of deterioration of concrete structures, since attack by which can occur in

PDF Deterioration of Wastewater Treatment and Collection

Sulfuric Acid Production • pH reduction at aerated surfaces • This produces sulfuric acid and carbonic acid • pH = 9.5 or lower, sulfuric oxidizing bacteria (SOB) • SOB colonize and use dissolved O 2 to metabolize H 2 S and other sulfides • H 2 S oxidized to form H 2 SO 4 • Acidic attack of cement paste

Factors affecting durability of concrete • Aggregate

However concrete is sometimes exposed to substances that can attack and cause deterioration. Concrete in chemical manufacturing and storage facilities is specially prone to chemical attack. The effect of sulfates and chlorides is discussed below. Acids attack concrete by dissolving the cement paste and calcareous aggregates.

Sulfuric Acid Attack on Concrete Sewer Pipe

Sulfuric Acid Attack on Concrete Sewer Pipe. Research was performed to determine if selected surface treatments would react chemically with the portland cement and increase the resistance of a mortar to sulfuric acid attack. Four parameters were investigated: (1) Portland cement type; (2) water/cement ratio; (3) sulfuric acid concentration; and (4) chemical surface treatment.

Acid Corrosion of Plain and Reinforced Concrete Sewage

Sep 09,  · The infrastructure of concrete sewage systems is affected notably by biogenic sulfuric acid attack, which causes rapid deterioration of each of its components. To provide a better understanding of this mechanism of damage, this paper reports on research carried out to study the response of the cementitious concrete matrix and the reinforcement

ASTM C1904 - 20 Standard Test Methods for Determination of

1.8 This standard does not cover concrete deterioration due to chemical sulfate attack, which is caused by the reaction of sulfate compounds that exist in wastewater with the hydration products of cement. Test methods for assessing sulfate attack are provided by Test Methods C452 and C1012/C1012M.

Steam cured concrete element concrete sleepers 42 Sulphate

Steam cured concrete element concrete sleepers 42 Sulphate attack in sea water from CE MISC at University of Technology Sydney