effect of acid soluble sulphate on concrete

Effect of Sulphate and Acid on Self-Compacting

Effect of Sulphate and Acid on Self-Compacting Concrete Containing Corn Cob Ash Article (PDF Available) in IOP Conference Series Materials Science and Engineering 413(1):012040

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Concrete Pipe in Acid Sulfate Soil Conditions

2018-4-22  the concrete and be concentrated by evaporation to cause disturbance. Acid resistance is dependent on the cement matrix of 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

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

2017-1-14  Clause 6.2.5.3 of BS 8110 Part-1: 1995, Structural use of concrete had a limit of 4% by mass of cement based on the total acid soluble content of the concrete mix, expressed as SO3. This ...

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Sulfate in concrete

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

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Sulphate Attack on Concrete - Process and Control of ...

2016-11-26  Sulphate attack on concrete is a chemical breakdown mechanism where sulphate ions attack components of the cement paste. The compounds responsible for sulphate attack on concrete are water-soluble sulphate-containing salts, such as alkali-earth (calcium, magnesium) and alkali (sodium, potassium) sulphates ...

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Sulfate damage to concrete floors on sulfate-bearing

2015-5-21  4 Sulfate damage to concrete floors on sulfate-bearing hardcore Outline of the guidance document Sections 1 to 5 provide information on the mechanism of sulfate attack and where it is most likely to be found. Key points made are: • For deleterious sulfate attack to occur in a ground floor slab, the concrete must be of

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Acid Attack on Concrete - Effects Results of Acid

3NO 2 + H 2 O ==> 2HNO 3 + NO. Though HNO 3 is not as strong as H 2 SO 4, its effect on concrete at brief exposure is more destructive since it transforms CH into highly soluble calcium nitrate salt and low soluble calcium nitro-aluminate hydrate.. Nitric acid attack is a typical acidic corrosion for shrinkage of the corroded layer due to leaching of highly soluble

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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 days, providing interesting data for visualizing the ...

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Acid attack on concrete - SlideShare

2013-4-22  Nitric acid attack is a typical acidic corrosion forshrinkage of the corroded layer due to leaching ofhighly soluble calcium nitrate.Such volume contractions of the corrodedlayer, especially for the case of nitric acid, can resultin the formation of

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Concrete Pipe in Acid Sulfate Soil Conditions

2018-4-22  the concrete and be concentrated by evaporation to cause disturbance. Acid resistance is dependent on the cement matrix of 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

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Sulfate in the Soil and Concrete Foundations

2005-3-13  Sulfate's effect on concrete foundations has been the source of litigation and large settlements in California and has raised questions in other parts of the United States. To learn what's going on with this, we asked two experts: Adam Neville, ...

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Acid Attack on Concrete - Effects Results of Acid

3NO 2 + H 2 O ==> 2HNO 3 + NO. Though HNO 3 is not as strong as H 2 SO 4, its effect on concrete at brief exposure is more destructive since it transforms CH into highly soluble calcium nitrate salt and low soluble calcium nitro-aluminate hydrate.. Nitric acid attack is a typical acidic corrosion for shrinkage of the corroded layer due to leaching of highly soluble calcium nitrate.

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Sulfate damage to concrete floors on sulfate-bearing

2015-5-21  4 Sulfate damage to concrete floors on sulfate-bearing hardcore Outline of the guidance document Sections 1 to 5 provide information on the mechanism of sulfate attack and where it is most likely to be found. Key points made are: • For deleterious sulfate attack to occur in a ground floor slab, the concrete must be of

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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 threat.

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BEHAVIOUR THE CONCRETE UNDER SEVERAL

2019-1-22  like. Sulphate ions contained in the concrete ingredients like cement, water, aggregate and admixture are the reason for internal sulphate attack [6, 7]. 2.3.1. Curing the concrete samples in Acid Sulphuric soluble For comparison the effect of the Sulphuric Acid in concrete in this paper we prepared parallel two sets of concrete samples:

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11 Technical Note - VicRoads

2016-12-29  CONCRETE AGGREGATE Aggregates for structural concrete must conform to the limits contained in AS 2758.1. This Standard requires that aggregates containing sulphide or sulphate salts (expressed as acid-soluble SO 3) in proportions that result in the sulphate content of concrete exceeding 5 % by mass of cement should not be used.

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chloride and sulphate content test of aggregate

Sulphate (sulfate) attacks the concrete which can lead to concrete cancer, cracking and reinforcement corrosion. The level at which this can occur is dependent on many factors such as the environment, cycles of wetting and drying, cement content and type, water to cement ratio, porosity, etc.

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Acid attack on concrete - SlideShare

2013-4-22  Nitric acid attack is a typical acidic corrosion forshrinkage of the corroded layer due to leaching ofhighly soluble calcium nitrate.Such volume contractions of the corrodedlayer, especially for the case of nitric acid, can resultin the formation of visually observable cracks acrossthe corroded layer.In the presence of these cracks the ...

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DETERMINATION OF SOLUBLE SULPHATE CONTENT

2015-5-7  Determination of Soluble Sulphate Content Purpose Sodium sulphate is present in some soils. The salt is easily hydrated and dehydrated under the influence of climatic changes. There are enormous volume changes during this process of hydration and dehydration, which influence the engineering properties of soils. Procedure Take the soil sample in a state in which []

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CORROSION OF CONCRETE FOUNDATIONS IN

2004-8-2  CORROSION OF CONCRETE FOUNDATIONS IN (POTENTIAL) ACID SULPHATE SOILS AND SUBSOILS IN THE NETHERLANDS A.F.van Holst and G.J.W.Westerve2d ,soil Survey Institute, Wageningen I. Introduction The great expansion of the cities in the west of The Netherlands is largely ta- king place in areas with a subsoil Of low bearing capacity.On such building si-

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Sulfate in the Soil and Concrete Foundations

2005-3-13  Sulfate's effect on concrete foundations has been the source of litigation and large settlements in California and has raised questions in other parts of the United States. To learn what's going on with this, we asked two experts: Adam Neville, ...

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BEHAVIOUR THE CONCRETE UNDER SEVERAL

2019-1-22  like. Sulphate ions contained in the concrete ingredients like cement, water, aggregate and admixture are the reason for internal sulphate attack [6, 7]. 2.3.1. Curing the concrete samples in Acid Sulphuric soluble For comparison the effect of the Sulphuric Acid in concrete in this paper we prepared parallel two sets of concrete samples:

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Sulfate Attack - External and Internal Causes

1998-8-8  Concrete durability is largely effected by its water/cementitious materials (w/cm) ratio. If the w/cm ratio is decreased, the porosity decreases and the concrete becomes more impermeable. The permeability of concrete is important because it controls the amount of water migration through concrete or the ability of concrete to resist penetration ...

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Assessment of sulfate-bearing ground for soil ...

9 Longworth TI (2004). Development of guidance on classification of sulfate-bearing ground for concrete. Concrete.Vol 38, No 2, pp.2526. 10 BRE (2003). Special Digest 1: Concrete in aggressive ground. CRC, London. 11 Bowley MJ (1995). Sulphate and acid attack on concrete in the ground: recommended procedures for soil analysis. Report BR 279 ...

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Effect of Weathering on Pyritic Clay Aggressivity John C ...

2012-1-19  Cement and Concrete C M A Clay weathering simulation tests •Chemical data indicate a small increase in acid soluble sulfate with time (up to 14 days) •Small amount of pyrite (1 – 2%) present •pH (2:1 extract remained near constant implying reaction with calcite) •Water soluble sulfur near constant (~ 0.15%S 2.3g/l SO 4 Class 2)

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11 Technical Note - VicRoads

2016-12-29  CONCRETE AGGREGATE Aggregates for structural concrete must conform to the limits contained in AS 2758.1. This Standard requires that aggregates containing sulphide or sulphate salts (expressed as acid-soluble SO 3) in proportions that result in the sulphate content of concrete exceeding 5 % by mass of cement should not be used.

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Acid attack on concrete - SlideShare

2013-4-22  Nitric acid attack is a typical acidic corrosion forshrinkage of the corroded layer due to leaching ofhighly soluble calcium nitrate.Such volume contractions of the corrodedlayer, especially for the case of nitric acid, can resultin the formation of visually observable cracks acrossthe corroded layer.In the presence of these cracks the ...

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Effect of Chloride Attack on Durability of Concrete ...

2 天前  Only soluble chlorides are responsible for reinforcement corr­osion. Dry chlorides have no effect on corrosion. Effect of Corrosion: The increased volume of rust exerts pressure or thrust on the cover of the concrete, resulting in cracks, spalling or delamination as shown in Fig.17.7. Corrosion Control:

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Permissible Levels of Chlorides ... - Concrete

1996-2-1  Q. We're designing a concrete structure in Egypt, and I received test results for the aggregate to be used in the concrete. The report lists chloride and sulfate content, but I don't know how to evaluate these numbers because ASTM C 33, "Standard Specification for Concrete

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