chemical attack on hardened concrete

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Chemical attack on hardened concrete

Chemical attack on hardened concrete Good concrete can resist some chemicals but requires protection from the destructive effects of others Acids have eroded this beam in a sewage treatment facility. selection of a coating. Taste and odor can be factors in selecting lin-

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Chemical Attack on Hardened Concrete Concrete ...

Aug 01, 1975  Chemical Attack on Hardened Concrete. By Concrete Construction Staff Download the PDF version of this article. (345.71 kB) Examples of deteriorating concrete are commonly known to all of us. Often the trouble comes from using a poor quality of concrete, but frequently good concrete has been unintentionally subjected to conditions that lead to ...

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Chemical Attack on Concrete - Structural Guide

Cement Carbonation Shrinkage as Chemical Attack on Concrete. Carbonation shrinkage occurs when the hardened concrete exposed to the air containing carbon dioxide. Harden concrete reacts with the carbon dioxide with the concrete in the presence of the water.

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

1) An extensive literature survey pertaining to chemical attack of materials specifically acids on concrete. 2) Determination of effect of acids on compressive strength of concrete through experimentation. 3) To study the effect of acid attack on concrete by varying following things:- Duration of attack

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

1) An extensive literature survey pertaining to chemical attack of materials specifically acids on concrete. 2) Determination of effect of acids on compressive strength of concrete through experimentation. 3) To study the effect of acid attack on concrete by varying following things:- Duration of attack

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(PDF) Study of Effect of Chemicals (Acid) Attack on ...

International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 04 Apr 2019 irjet p-ISSN: 2395-0072 Study of Effect of Chemicals (Acid) Attack on Strength and Durability of Hardened Concrete

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Sulfate Attack - an overview ScienceDirect Topics

Sulfate attack is a term used to describe a series of deleterious chemical reactions between sulfate ions and the components of hardened concrete, principally the cement matrix, caused by exposure of concrete to sulfates and moisture (Skalny et al., 2002). The sulfates of greatest concern for the durability of concrete

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

Feb 14, 2017  The chemical reactions involved in sulphuric acid attack on cement based materials can be given as follows: Ca(OH) 2 + H 2 SO 4 ==> CaSO 4.2H 2 O. 3CaO.2SiO 2.3H 2 O + H 2 SO 4 ==> CaSO 4.2H 2 O + Si(OH) 4. Effect of Nitric Acid on Concrete. Nitric acid usually occurs in chemical

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Chemical attack on concrete 2017 - SlideShare

Mar 07, 2017  Carbonation Chloride attack CHEMICAL ATTACK ON CONCRETE Alkali aggregate reaction Sulphate attack Acid attack THE MAHARAJA SAYAJIRAO UNIVERSITY, BARODA 23/02/2017 3 Alkali aggregate reaction 4. CARBONATION Carbonation of a concrete is a process by which CO2 from the air penetrate in to concrete

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What Is Hardened Concrete Properties of Hardened Concrete

Hardened concrete is ... Durability: Concrete is extremely resistant to the physico-chemical attack emanating from the environment (frost, rain atmospheric pollution, etc.) It is particularly well-suited for

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Hardened Concrete: Properties of Hardened Concrete

Hardened Concrete has a tendency to become porous due to the presence of voids formed during or after placing of concrete. Penetration by the substance may adversely affect the durability, i.e. Ca(OH) 2 leach

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Properties of Hardened Concrete; A Detailed Guide.

Characteristic strength, drying shrinkage, creep, modulus of elasticity, permeability and resistance to chemical attack are hardened and time-dependent properties of concrete that may influence structural performance. We will discuss different properties of hardened concrete

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durability of concrete Topic

Aug 01, 2021  Durability of concrete is determined by its ability to resist weathering action, chemical attack, abrasion, or any other process of deterioration, and will retain its original form, quality, and serviceability when exposed to its environment. Durable concrete

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(PDF) Toughness and Flexibility Characteristics of Plain ...

action,chemical attack, and abrasion while . maintaining its desired engineering properties. ... This research evaluates the strength and strength efficiency factors of hardened concrete, by ...

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The Impact of Long-Term Physical Salt Attack and ...

concrete durability, including physical salt attack (PSA) [3–13], cyclic wetting and drying (CWD) [14–16], the water–cement ratio of the initial concrete mix [14,17–19], chemical ad-mixtures [20]. The clear majority of studies deals with durability and reliability of vibrated concrete

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Hardened Concrete - Properties of Hardened Concrete

Jul 29, 2018  Strength of Hardened Concrete. The compressive strength of concrete is the most common measure for judging not only the ability of the concrete to withstand load, but also the quality of the hardened concrete

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The Deleterious Chemical Effects of Concentrated Deicing ...

The chemical attack of the hardened cement paste is significantly reduced if supplementary cementitious materials are included in the concrete mixture. Both coal fly ash and ground granulated blast furnace slag were found to be effective at mitigating the chemical attack

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INTRODUCTION TO CONCRETE Flashcards Quizlet

Aug 07, 2021  hardened concrete. stage where in concrete hardens due to chemical reaction bet. water and cement. slump unit weight air content temperature. tests on fresh concrete. ... chemical attack, and

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The Deleterious Chemical Effects of Concentrated Deicing ...

The chemical attack of the hardened cement paste is significantly reduced if supplementary cementitious materials are included in the concrete mixture. Both coal fly ash and ground granulated blast furnace slag were found to be effective at mitigating the chemical attack

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

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 that are capable of chemically reacting ...

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

Feb 14, 2017  The chemical reactions involved in sulphuric acid attack on cement based materials can be given as follows: Ca(OH) 2 + H 2 SO 4 ==> CaSO 4.2H 2 O. 3CaO.2SiO 2.3H 2 O + H 2 SO 4 ==> CaSO 4.2H 2 O + Si(OH) 4. Effect of Nitric Acid on Concrete. Nitric acid usually occurs in chemical plants producing explosives, artificial manure and other similar ...

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Sulphuric Acid Attack on Concrete Tanks

and attack the exterior of the tank. The problem is addressed by using sulphate-resistant concrete such as type-50 cement (Darby, 2004) Through a series of chemical reactions, sulphate ions (SO2-4) in the soil react can react with hydration products present in hardened cement {such as tricalcium aluminate (3CaO • Al 2O 3), calcium hydroxide ...

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durability of concrete Topic

Aug 01, 2021  Durability of concrete is determined by its ability to resist weathering action, chemical attack, abrasion, or any other process of deterioration, and will retain its original form, quality, and serviceability when exposed to its environment. Durable concrete is a result of proper design, proportioning, placement, finishing, testing, inspection, and curing.

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Sulphate attack - SlideShare

Nov 28, 2015  3. Sulphate Attack • Increase in the volume of cement paste in concrete or mortar due to the chemical reaction between the products of HCP and solution containing sulphates. • In hardened concrete, C-A-H can react with sulphate salt from outside, forming calcium sulphoaluminate in the framework of HCP.

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Factors affecting durability of concrete • Aggregate ...

Jan 27, 2010  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.

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Durability of Concrete Types of Durability and Factors ...

Feb 14, 2017  Durability is defined as the capability of concrete to resist weathering action, chemical attack and abrasion while maintaining its desired engineering properties. It normally refers to the duration or life span of trouble-free performance. Different concretes require different degrees of durability depending on the exposure environment and properties desired.

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(PDF) Toughness and Flexibility Characteristics of Plain ...

action,chemical attack, and abrasion while . maintaining its desired engineering properties. ... This research evaluates the strength and strength efficiency factors of hardened concrete, by ...

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Alkali–silica reaction - Wikipedia

The alkali–silica reaction (ASR), more commonly known as "concrete cancer", is a deleterious swelling reaction that occurs over time in concrete between the highly alkaline cement paste and the reactive amorphous (i.e., non-crystalline) silica found in many common aggregates, given sufficient moisture.. This deleterious chemical reaction causes the expansion of the altered aggregate by the ...

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(PDF) Nitric Acid Attack on Hardened of Geopolymeric ...

concrete to chemical attack by acids such as sulfuric, nitric, hydrochloric, and organic acids was claimed to. ... Nitric acid attack on hardened paste of geopolymeric cements, Part 1.

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The Deleterious Chemical Effects of Concentrated Deicing ...

The chemical attack of the hardened cement paste is significantly reduced if supplementary cementitious materials are included in the concrete mixture. Both coal fly ash and ground granulated blast furnace slag were found to be effective at mitigating the chemical attack

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The Impact of Long-Term Physical Salt Attack and ...

concrete durability, including physical salt attack (PSA) [3–13], cyclic wetting and drying (CWD) [14–16], the water–cement ratio of the initial concrete mix [14,17–19], chemical ad-mixtures [20]. The clear majority of studies deals with durability and reliability of vibrated concrete

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(PDF) APPLICATION OF FUZZY LOGIC TO VISUAL EXAMINATION

INTRODUCTION Sulphate attack, constituting a major risk of chemical aggression for concrete and other building materials, has been taken up vigorously in the research studies [1]. It is reported that sulphate attack is difficult to measure because it is the result of a complex set of chemical processes and there is still a lot of controversy ...

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