تفاصيل المنتج

Chemical Attack on Concrete - Structural Guide

2020-1-4  There are three main causes that could cause cracking due to the actions of the chemical attack on concrete. Corrosion of Reinforcements. Alkali-aggregate reaction. Cement Carbonation shrinkage. Effect of Corrosion of Reinforcement on Cracking of Concrete. Corrosion of reinforcement could occur in any environment and it is not necessary to be a ...

Inquire now

What are the chemical attack on concrete? – AnswersToAll

2021-3-11  What are the chemical attack on concrete? A chemical attack involves dissolution of substances or chemical reactions between substances and components of the concrete. Reaction products might cause problems, due to dissolution or expansion. Examples are numerous: Acid attack dissolving the binder from the concrete surface.

Inquire now

Types of Chemical Attacks on Concrete Structures - The

2014-7-13  🕑 Reading time: 1 minuteContents:IntroductionTypes of chemical attacks on concrete structuresSulphate attack on concretePrecautionsChloride attack on concreteAlkali-Aggregate reaction on concretePrecautionsCarbonation in concreteAcid attack on concretePrevention of acid attack Introduction When a concrete structure is prone to chemical actions its durability gets

Inquire now

Effects of Substances on Concrete and Guide to

2014-9-29  The first line of defense against chemical attack is to use quality concrete with maximum chemical resistance. This is enhanced by the application of protective treatments in severe environments to keep corrosive substances from contacting the concrete or to improve the chemical resistance of the concrete surface. Protective surface treat-

Inquire now

Part B: Chemical attack on concrete

2004-12-22  B2. Principal types of chemical attack on concrete B2.1 Sulfate attack The essential agents for sulfate attack are sulfate anions (SO 4 2-). These are transported to the concrete in various concentrations in water, together with cations, the more common of which are calcium, magnesium and sodium. Where porous concrete is in contact with saturated

Inquire now

The effects of chemical attacks on physical and mechanical

Abstract This study investigates the effects of corrosive conditions on the physical and mechanical properties of concrete produced in cold weather. 30% calcium nitrate and 5% hydroxyethylaminemixture (HEA) were used as additives in antifreeze. Within 15 min of placing the prepared concrete samples in molds, the samples were put in a deep freezer. They were

Inquire now

Effects Results of Acid Attack on Concrete - AboutCivil.Org

2017-2-14  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 ...

Inquire now

EFFECT OF CEMENT CONTENT AND CEMENT TYPE ON

Mortar and concrete are two important construction materials widely used in both domestic and industrial constructions all over the world. A durable concrete is able to withstand the attacks of destructive processes of chemical, physical or mechanical origin, acting externally or arising internally. Chemical salt attack is caused by ingressing salts into cementitious materials, and

Inquire now

Chemical Attack Springer for Research Development

This chapter highlights the common forms of chemical attack on concrete and reinforcement, and their possible deteriorated effects with suggested protective measures meeting various international standards. The forms of chemical attacks on concrete discussed are chloride attack, sulphate attack, carbonation, alkali-aggregate reaction, and acid ...

Inquire now

Chemical Attack Springer for Research Development

This chapter highlights the common forms of chemical attack on concrete and reinforcement, and their possible deteriorated effects with suggested protective measures meeting various international standards. The forms of chemical attacks on concrete discussed are chloride attack, sulphate attack, carbonation, alkali-aggregate reaction, and acid ...

Inquire now

Chemical Attack on Hardened Concrete

1975-8-1  When portland cement concrete is made with non-alkali-reactive aggregates, it is highly resistant to strong solutions of most bases. Calcium, ammonium, barium and strontium hydroxides are normally harmless, but sodium hydroxide may cause damage. Salts are chemical compounds usually formed by reaction between acids and bases.

Inquire now

Chemical attack on hardened concrete

the rate of chemical attack by con-tinually exposing a fresh surface to the chemical. High tempera t u re s f u r ther compound the problem be-cause chemical reactions are speed-ed up as tempera t u r e incre a s e s . When the attacking agent cannot be resisted by concrete of any quali-t y , it is necessary to use special sur-

Inquire now

The effects of chemical attacks on physical and mechanical

Abstract This study investigates the effects of corrosive conditions on the physical and mechanical properties of concrete produced in cold weather. 30% calcium nitrate and 5% hydroxyethylaminemixture (HEA) were used as additives in antifreeze. Within 15 min of placing the prepared concrete samples in molds, the samples were put in a deep freezer. They were

Inquire now

Part B: Chemical attack on concrete

2004-12-22  B2. Principal types of chemical attack on concrete B2.1 Sulfate attack The essential agents for sulfate attack are sulfate anions (SO 4 2-). These are transported to the concrete in various concentrations in water, together with cations, the more common of which are calcium, magnesium and sodium. Where porous concrete is in contact with saturated

Inquire now

Chemical Attack: Practical Problems and Solutions

2019-1-1  In book: Concrete Construction (pp.223-238) Authors: Akhtar Surahyo

Inquire now

Sulphate Attack On Concrete And Its Prevention

2020-4-22  Internal sulphate attack in concrete involves a chemical reaction between celite (C 3 A or tricalcium aluminate) present in the cement paste and the sulphates present in the concrete mix. On the other hand, the external

Inquire now

Effect of Chloride Attack on Durability of Concrete

2022-7-24  White dealing with the durability aspect of concrete, the chloride effect on concrete is the most impor­tant factor as it causes the corrosion of reinforcement of concrete. The statistical studies have shown that more than 40% structures have failed due to the corrosion of reinforcement steel. Due to high alkaline nature of calcium hydroxide ...

Inquire now

(PDF) Effect of Carbonation, Chloride and

2018-7-1  A procedure for integrating the synergistic effect of both internal frost attack and frost scaling on carbonation and chloride penetration for the service life design of reinforced concrete ...

Inquire now

Acid Attack - an overview ScienceDirect Topics

T.G. Nijland, J.A. Larbi, in Non-Destructive Evaluation of Reinforced Concrete Structures: Deterioration Processes and Standard Test Methods, 2010 Acid attack. Acid attack is the dissolution and leaching of acid-susceptible constituents, mainly calcium hydroxide, from the cement paste of hardened concrete. This action results in an increase in capillary porosity,

Inquire now

Chemical Attack on Durability of Concrete in the

Deterioration in concrete not only affects the aesthetic beauty of the structure, but also is highly important from the point of view of durability. Despite concerted efforts of scientists and technologists to solve this problem, concrete deterioration continues to exist on a global scale.The paper reviews the most important modes of chemical attack on concrete, which include

Inquire now

Chemical causes of concrete degradation

2017-11-23  The durability of reinforced concrete structures depends on their behavior in relation to the climatic and environmental conditions that exist in the environments in which they are built. These structures are often subject to a

Inquire now

The effects of chemical attacks on physical and mechanical

2014-4-30  This study investigates the effects of corrosive conditions on the physical and mechanical properties of concrete produced in cold weather. 30% calciu

Inquire now

Chloride Attacks on Concrete Structures - ctlgroupqatar

2019-2-2  When considering durability of concrete, chloride attack is the most imminent enemy. It is responsible for almost 40% of failure of concrete structures. ... Corrosion takes place as the chloride ions meet with the steel and the surrounding passive material to produce a chemical process which forms hydrochloric acid. The hydrochloric acid eats ...

Inquire now

Sulphate attack in Concrete, Its Effects, Causes and

Sulphate attack is a chemical break down mechanism where suphate ion attacks on components of cement paste. Sodium Sulphate attacks calcium hydroxide and forms gypsum that becomes more than doubles the volume. Sulphate attack might show itself in different forms depending upon the chemical form of the sulfate and the atmospheric environment ...

Inquire now

Effects of fertilizer and pesticides on concrete - OSTI.GOV

1994-12-31  @article{osti_28870, title = {Effects of fertilizer and pesticides on concrete}, author = {Broder, M F and Nguyen, D T and Harner, A L}, abstractNote = {Concrete is the most common material of construction for secondary containment of fertilizers and pesticides because of its relative low cost and structural properties. Concrete, however, is porous to some products it is

Inquire now

Chemical Attack: Practical Problems and Solutions

2019-1-1  In book: Concrete Construction (pp.223-238) Authors: Akhtar Surahyo

Inquire now

EFFECT OF CEMENT CONTENT AND CEMENT TYPE ON

2009-1-1  Download Citation On Jan 1, 2009, A. E Sayed and others published EFFECT OF CEMENT CONTENT AND CEMENT TYPE ON THE RESISTANCE OF CONCRETE AGAINST CHEMICAL ATTACK Find, read and cite all the ...

Inquire now

Geochemistry of Ground and Groundwater

2018-2-1  Geochemistry of Ground and Groundwater Pertinent to Chemical Attacks Mitigation on Concrete Foundations; A Case Study of the City of Rasht, Northern Iran

Inquire now

Effects of Fire on Concrete - EDT

2019-8-1  Concrete exposed to the elevated temperatures of a fire can experience both mechanical changes and chemical changes. Potential mechanical changes include: Spalling ‐ The expulsion of portions of concrete

Inquire now

المقالات التي تهمك

اترك لنا أرسالة