CALL US

+86 17838360708

Chemical attack in concrete SlideShare

Chemical attack in concrete SlideShare

About this site

Sep 29, 2014  Chemical attack in concrete. 1. Chloride Attack Chloride attack is one of the most important aspects while dealing with durability of concrete. It primarily causes corrosion of reinforcement. Statistics have indicated that over 40% of failure of structures is due to corrosion of steel. Concrete and the Passive Layer The strongly alkaline nature ...

get price

About this site

Sep 26, 2016  Concrete acts as the electrolyte, and the metallic connection is provided by wire ties, chair supports, or the rebar itself. 5. Chemical attacks: Chloride attack Sulphate attack Carbonation Alkali-aggregate attack 6. CHLORIDE ATTACK • Chloride attack is one of the most important aspects while dealing with durability of concrete.

get price

About this site

Mar 07, 2017  Chemical attack is the reaction of chemical elements from exposure and moisture present in the concrete which results into deterioration of RCC structure. THE MAHARAJA SAYAJIRAO UNIVERSITY, BARODA 23/02/2017 2 CHEMICAL ELEMENT FROM + EXPOSURE MOISTURE IN CONCRETE CRACKS = IN CONCRETE OR REINFORCEMENT. 3.

get price

About this site

Jan 15, 2018  9/12/2015 3 INTRODUCTION Sulphate attack is one of the most important causes of concrete deterioration. Soilds salts don’t attack concrete but when present in solution, they can react with the hydrated cement paste. Soluble sulfate (Na, Ca and Mg) is common in mining operations, chemical and paper milling industries. Sodium and calcium most ...

get price

About this site

Aug 18, 2016  Chemical attack on the durability of underground structures 1. Chemical attack on the durability of underground structures Workshop Middle East Concrete 2015 Abu Saleh Mohammod PhD, MICT General Manager Pudlo Middle East Building Materials L.L.C 2.

get price

Chemical attack on the durability of ... - SlideShare

Aug 18, 2016  Chemical attack on the durability of underground structures 1. Chemical attack on the durability of underground structures Workshop Middle East Concrete 2015 Abu Saleh Mohammod PhD, MICT General Manager Pudlo Middle

get price

Chemical attack in concrete - SlideShare

Mechanism of different chemical attacks in a concrete like chloride attack, sulfate attack , which causes corrosion and spalling. Other reactions are alkali ag

get price

Properties of Concrete - Portland Cement Association

Sulfate Attack. Others. The durability of concrete may be defined as the ability of concrete to resist weathering action, chemical attack, and abrasion while maintaining its desired engineering properties. Concrete is exposed to a greater variety of potentially harmful exposure conditions than any other construction material.

get price

Types of Chemical Attacks on Concrete Structures - The ...

🕑 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 affected. The chemicals

get price

ABRASION RESISTANCE OF CONCRETE AND THE USE OF

Concrete deterioration primarily results from some combination of the following mechanisms: abrasion and hydraulic pressure cracking at rail seat, freeze-thaw damage, chemical attack like alkali silica reaction (ASR), and cracking under impact and frequent dynamic loads[2]. One possible solution to this problem is the use of high performance ...

get price

Chemical disruption - BrainKart

Chemical disruption . Resistance of concrete to chemical attack: ü The cement composition used in the concrete.. ü Conditions under which the cement paste hardened . ü All determine properties of concrete . 1Sulphate Attack . Mechanism-sulphates are found in most of the soils as calcium, potassium, sodium and magnesium sulphates.

get price

19 Types of cement - Cement Concrete

Nov 10, 2019  Due to the attack of sulphate in O.P.C. cement, there are chances of expansion within the framework of concrete and there are cracks and subsequent disruption. Many research found that to reduce sulphate attack, cement with low C3A content better results. Sulphates resisting cement has a high silicate content that is with low C3A and low C4AF.

get price

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.

get price

Protecting Concrete Tanks in Water and Wastewater ...

Dec 28, 2000  This expansion from within creates large tensile forces within the concrete. Since concrete is relatively weak in tension, the concrete cracks to relieve the tensile stresses (Figure 3). Once the concrete cracks, water, oxygen and aggressive chemicals can freely enter the concrete and attack the embedded rebar and the deterioration process ...

get price

Chemical Admixtures – Its Types, Advantages, and ...

Feb 27, 2021  Chemical admixtures are the ingredients in concrete other than Portland cement, water, fine aggregates, and coarse aggregates that are added to the mix immediately before or during mixing concrete. Producers utilize chemical admixtures to reduce the cost of concrete construction; to modify the properties of hardened concrete; to ensure the concrete quality during mixing, transporting,

get price

Notes On Concrete Durability Chapter Welcome To

it is placed. The resistance of concrete to weathering, chemical attack, abrasion, frost and fire depends largely upon its quality and constituent materials. All concrete in service will be subject to chemical and physical changes. Chapter 2 seviceability and durability - LinkedIn SlideShare

get price

Notes On Concrete Durability Chapter Welcome To

The resistance of concrete to weathering, chemical attack, abrasion, frost and fire depends largely upon its quality and constituent materials. All concrete in service will be subject to chemical and physical changes. Chapter 2 seviceability and durability - LinkedIn SlideShare

get price

Concrete Durability Freeze-Thaw DRP Consulting

Concrete affected by freeze-thaw damage (FTD) has crack networks well below the finished surface and around joints. Many factors make concrete susceptible to FTD, ranging from improper proportioning (inadequate air and/or excessive water) and poor materials (unsound aggregates) to improper design and project specifications.

get price

Notes On Concrete Durability Chapter Welcome To

resistance of concrete to weathering, chemical attack, abrasion, frost and fire depends largely upon its quality and constituent materials. All concrete in service will be subject to chemical and physical changes. Chapter 2 seviceability and durability - LinkedIn SlideShare Here you can download the free lecture Notes of Concrete

get price

Chemical attack in concrete - SlideShare

Chemical attack in concrete 1. Chloride Attack Chloride attack is one of the most important aspects while dealing with durability of concrete. It primarily causes corrosion of reinforcement. Statistics have indicated that over 40% of failure of structures is due

get price

Concrete in Aggressive Environment - SlideShare

Acid attack is encountered also under industrial conditions. Concrete is also attacked by water containing free CO2. Flowing pure water formed by melting ice or by condensation and containing little CO2, also dissolves Ca(OH)2 thus causes deterioration of concrete.• In practice, acid attack

get price

Durability of Concrete - pt.slideshare

•Chemical causes- it is associates with chemical reaction in concrete (sulphate attack, acid attack by sea water, chloride attack, alkali aggregates reaction, carbonation). 5. Damage of concrete due to lack of Durability • Fine to wide cracks developed in concrete. • Scaling (localized small patches) of concrete

get price

High-Performance Concrete, Chapter 17 - Memphis

Resistance to chemical attack Expose concrete to saturated No deterioration after 1 year solution in wet/dry environment Sulfate attack ASTM C 1012 0.10% max. expansion at 6 months for moderate sulfate exposures or 0.5% max. expansion at 6 months for severe sulfate exposure

get price

Types and Causes of Concrete Deterioration

Concrete can deteriorate for a variety of reasons, and concrete damage is often the result of a combination of factors. The following summary discusses potential causes of concrete deterioration and the factors that influence them. CORROSION OF EMBEDDED METALS Fig. 1. Corrosion of reinforcing steel is the most common cause of concrete ...

get price

ABRASION RESISTANCE OF CONCRETE AND THE USE OF

Concrete deterioration primarily results from some combination of the following mechanisms: abrasion and hydraulic pressure cracking at rail seat, freeze-thaw damage, chemical attack like alkali silica reaction (ASR), and cracking under impact and frequent dynamic loads[2]. One possible solution to this problem is the use of high performance ...

get price

Chloride Attack on Concrete Structures - Cause and ...

Prevention of Chloride Attack on Concrete Structures Several methods are available in order to prevent the effect of chlorides on concrete structures. Some of them are: Increasing the cover over the reinforcement bar. This is the simplest way to prevent chloride attack. Studies have shown that an increase in cover by one inch can increase the ...

get price

(PDF) Corrosion of Steel in Concrete Professor Dr ...

Corrosion of Steel in Concrete Understanding, investigation and repair 2nd edition John P. Broomfield

get price

Cement - The major cements: composition and properties ...

Set cement and concrete can suffer deterioration from attack by some natural or artificial chemical agents. The alumina compound is the most vulnerable to chemical attack in soils containing sulfate salts or in seawater, while the iron compound and the two calcium silicates are more resistant. Calcium hydroxide released during the hydration of ...

get price

CORROSION OF CONCRETE REINFORCEMENT – CAUSES REMEDIES ...

Dec 23, 2015  Corrosion of Concrete Reinforcement Corrosion is a chemical process of destruction of material because of its reaction with the environmental conditions. The most predominant among various factors of corrosion is the atmospheric corrosion which causes the rusting of steel. Appreciable corrosion only starts when the relative humidity of the air exceeds around 65%. In dry, []

get price

Properties of Concrete - an overview ScienceDirect Topics

Ravindra K. Dhir OBE, ... Chao Qun Lye, in Sustainable Construction Materials, 2019. The durability properties of concrete made with RA, namely permeation properties, resistance to carbonation and chloride penetration, chemical attacks, resistance to freeze–thaw attack and abrasion, as well as the alkali–silica reaction of concrete made with RA, have also been discussed.

get price

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.

get price

Chemical Burns: Causes, Symptoms, Treatment, Prevention, Care

Chemical Burn Symptoms. Chemical burn of the skin. Chemical burn of the eye.. All chemical burns should be considered medical emergencies. If you have a chemical burn of the mouth or throat, call ...

get price

Notes On Concrete Durability Chapter Welcome To

The resistance of concrete to weathering, chemical attack, abrasion, frost and fire depends largely upon its quality and constituent materials. All concrete in service will be subject to chemical and physical changes. Chapter 2 seviceability and durability - LinkedIn SlideShare

get price