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effect of acid soluble sulphate on concrete :

Effect of Sulphate and Acid on Self-Compacting Concrete ...

2018-9-1  Self-compacting concrete requires high powder content which implies increased cost and increased CO 2 emission into the environment; hence, the need for the inculcation of a supplementary cementitious material (SCM) to the concrete mix such as corn cob ash (CCA) which is obtained by drying, grinding and burning the corn cobs. The chemical composition of the corn cob ash showed that it was ...

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Effect of Sulphate Attack on Durability of Concrete ...

2021-8-29  To control or resist the sulphate effect on concrete the most effective and efficient method is the use of low calcium aluminate (C 3 A) cement. In general it can be said that 7% C 3 A content is a rough division between cement of good and poor performance in sulphate waters. (b) Quality of Concrete:

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Sulfate in concrete

Excessive amounts of mobile sulfate, derived from aggregates or other constituents in concrete, can cause disruption due to expansion. BS 8110 part 1 Structural use of concrete, 1985, had a limit of 4% by mass of cement based on the total acid soluble sulfate method expressed as SO 3 (clauses 6.2.5.3).

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Concrete Pipe in Acid Sulfate Soil Conditions

2018-4-22  Sulfate resistance of concrete pipe, like typical concrete, is dependent on the physical and chemical resistance to the penetration of sulfate ions. The sulfate ions must penetrate the concrete and be concentrated by evaporation to cause disturbance.

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Sulfate Attack and Sulfate Content in Concrete: A ...

2017-1-14  External sulfate attack is the most common type and typically occurs where water containing dissolved sulfate penetrates the concrete. The composition and microstructure of concrete will change due...

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Effect of sulphuric acid on plasticized concrete

2020-2-20  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. Useful information regarding the effect of sulphuric acid on concrete and recommendations to

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Concrete Deterioration Caused by Sulfuric Acid Attack

2012-9-11  Sulfuric acid solution in sewage, wastewater treatment plants and hot spring places deteriorates concrete structures hard by reacting with cement hydrates. Concrete is not a chemically stable material under the condition of acidic environment. Although acid attack is one of the primary chemical deterioration of concrete for many years, the prediction method for this kind of deterioration has not been established yet. In Japan,

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

2017-2-14  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

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THE EFFECT OF WATER/CEMENT RATIO ON THE SULFATE

2019-4-21  Large amount of concrete and cementitious materials are used in the waste water systems where sulfate attack is one of the major threats for durability of these infrastructures. External sulfate attack characterized by ingress of sulfate ions from surrounding medium leads to the extensive degradation of concrete and reinforced concrete pipes, having significant (negative) implications for the life cycle costing. When concrete is in contact with salts containing sulfate, interactions between the solid phase and the sulfate solutions occur and ettringite and gypsum are observed as main reaction products [1-3]. Ettringite is formed from calcium sulfate (gypsum) and C3A via monosulfate (AFm) according to Eq. (1). Gypsum is the primary product of sulfate attack on concrete (forming by reaction of sulfate

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Analysis of carbonate and sulphate attack on concrete ...

2017-9-1  The existence of a slightly increased amount of ettringite in the concrete cover may be related to the reaction of aluminate phases with sulphate ions, which can be activated in the pore solution. This may occur when sodium and potassium ions leave the pore solution being leached by rainwater. Download : Download high-res image (53KB)

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Effect of Sulphate and Acid on Self-Compacting Concrete ...

Self-compacting concrete requires high powder content which implies increased cost and increased CO 2 emission into the environment; hence, the need for the inculcation of a supplementary cementitious material (SCM) to the concrete mix such as corn cob ash (CCA) which is obtained by drying, grinding and burning the corn cobs. The chemical composition of the corn cob ash showed that it was ...

More

Concrete Pipe in Acid Sulfate Soil Conditions

2018-4-22  the concrete and its ability to resist the formation of soluble calcium products that affect the surface. Thus, in acid sulfate soils, the aggressiveness of the environment needs to be assessed separately for the effects of sulfate and acid. Tables 2 3 set out recommen-dations applicable to

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Effect of Sulphate and Acid on Self-Compacting Concrete ...

2018-9-1  This site uses cookies. By continuing to use this site you agree to our use of cookies. To find out more, see our Privacy and Cookies policy. Close this notification

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Effect of sulphuric acid on plasticized concrete

2020-2-20  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. Useful information regarding the effect of sulphuric acid on concrete and recommendations to

More

Impacts of acid sulfate soils Environment, land and ...

Impacts on health. Though not yet fully documented, the possible health impacts of acid sulfate soils are under investigation. Effects could include: stunted growth, poor health and mental impairment caused by drinking or bathing in aluminium-rich waters. dermatitis as a result of skin contact with acid soil materials.

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Effect of Surface Coatings in the Corrosion of Reinforced ...

2013-9-11  The presence of sulfate ions and low pH represent the most aggressive conditions for concrete structures. Studies on the performance of concrete in acid solutions (H 2 SO 4, HNO 3, HCl) from industrial waters have shown a large and fast concrete deterioration, due to the transport of soluble

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Acid attack on concrete - SlideShare

2013-4-22  HYDROCHLORIC ACID ATTACKThe chemicals formed as the products of reactionbetween hydrochloric acid and hydrated cement phasesare some soluble salts and some insoluble saltsSoluble salts, mostly with calcium, are subsequentlyleached out,

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Resistance of Mineral Admixture Concrete to Acid Attack

readily reacts with acid, thereby protecting the C-S-H from the adverse affect of acid. The improvement re-ported by some other authors may be due to the denser and improved microstructure of concrete resulting from SCM incorporation. In this study, the effect of the water-to-binder ratio and the presence of SCM on the resistance of concrete

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Overview of Acid Sulfate Conditions, Weathering

2020-1-1  Overview of Acid Sulfate Conditions, Weathering Processes and Effects W. Lee Daniels [email protected] landrehab Objectives for Today • 1. Understand the nature and occurrence of acid sulfate materials in Virginia and the Fredericksburg region. • 2. Relate S form and content to the potential for a given material to pose soil, water ...

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(PDF) Effect of Carbonation, Chloride and Sulphate Attacks ...

Ca rbonation is detrimental to the. resistance of sulphate attack of concrete materials. Zhu et al. (2016) studied the combined effect of carbonation and chloride ingress in concrete. Carbonation ...

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Effect of Sulphate and Acid on Self-Compacting Concrete ...

Self-compacting concrete requires high powder content which implies increased cost and increased CO 2 emission into the environment; hence, the need for the inculcation of a supplementary cementitious material (SCM) to the concrete mix such as corn cob ash (CCA) which is obtained by drying, grinding and burning the corn cobs. The chemical composition of the corn cob ash showed that it was ...

More

Effect of Sulphate and Acid on Self-Compacting Concrete ...

2018-9-1  This site uses cookies. By continuing to use this site you agree to our use of cookies. To find out more, see our Privacy and Cookies policy. Close this notification

More

Effect of sulphuric acid on plasticized concrete

2020-2-20  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. Useful information regarding the effect of sulphuric acid on concrete and recommendations to

More

EFFECT ON STRENGTH PARAMETERS OF DOUBLE MIXED

2016-4-23  OSB et al,1995 [1,2]. Sulphate attack on concrete is a complex process as reported by MD Cohen et al,1991[3]. Many factors, such as cement type, sulphate cat ion type, sulphate concentration and exposure period, may affect the sulphate resistance and water is an essential ingredient in mortar.

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CBD-136. Concrete in Sulphate Environments - NRC-IRC

2007-12-7  The sulphate concentration in sea water (in soluble, available form) is extremely high and is of the order of concentration that has proved to be damaging to concrete in groundwater. The fact that much concrete in sea water is only partly immersed and therefore subject to high moisture intake is certain to pose a sulphate

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Effect of Temperature and Acidity of Sulfuric Acid on ...

In this investigation, the concrete samples are submerged in three sulfuric acid solutions (pH = 0.5, 1, and 2) for 91 days under different temperatures (10, 20, and 30°C). Mass loss and compressive strength of the concrete specimens were tested and recorded at 7, 14, 28, 42, 56, and 91

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Resistance of Mineral Admixture Concrete to Acid Attack

readily reacts with acid, thereby protecting the C-S-H from the adverse affect of acid. The improvement re-ported by some other authors may be due to the denser and improved microstructure of concrete resulting from SCM incorporation. In this study, the effect of the water-to-binder ratio and the presence of SCM on the resistance of concrete

More

Overview of Acid Sulfate Conditions, Weathering

2020-1-1  Overview of Acid Sulfate Conditions, Weathering Processes and Effects W. Lee Daniels [email protected] landrehab Objectives for Today • 1. Understand the nature and occurrence of acid sulfate materials in Virginia and the Fredericksburg region. • 2. Relate S form and content to the potential for a given material to pose soil, water ...

More

Acid Resistance - Portland Cement Association

The main reason for the increased acid resistance of the concrete investigated was the formation of a very dense hardened cement paste and aggregate interface with very low porosities. The use of slag cement increased acid resistance as well as portland cements

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Effects of Bauxsol on the immobilisation of soluble acid ...

The effects of Bauxsol, an abundant industrial by-product, on the immobilisation of soluble acid and a range of potentially environmentally toxic metals in artificial and natural acid sulfate soils were investigated. The acid neutralising capacity of Bauxsol increased with decreasing pH, which is probably provided not only by basic metal hydroxides, carbonates, and hydroxycarbonates but also ...

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