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Alkali silica reaction - SlideShare

2018-12-11  Alkali-silica reaction is one of the most recognized deleterious phenomena in concrete. Various types of silica present in aggregates react with the hydroxyl ions present in the pore solution in concrete. The silica, now in solution, reacts with the sodium (Na+) and potassium (K+) alkalis to form a volumetrically unstable alkali silica gel.

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PPT – Alkali-Silica Reaction: PowerPoint presentation ...

Alkali-Silica Reaction: Description: Less reactive aggregates often expensive or difficult to find ... exerting a force against surrounding concrete. Creation of alkali-silica gel ... – PowerPoint PPT presentation. Number of Views: 469. Avg rating:3.0/5.0. Slides: 27.

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Lectures No. 09 10 - faculty.kfupm.edu.sa

2013-1-8  Subject: Alkali-Aggregate Reactivity Certain constituents in aggregates can react harmfully with alkali hydroxides in concrete and cause significant expansion. There are two forms of this reaction: Alkali silica reaction (ASR) Alkali-carbonate reaction (ACR) Alkali silica reaction (ASR) Develops by aggregates containing reactive silica minerals.

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Alkali-Silica Reaction In Concrete - idc-online

2019-2-4  The alkali-silica reaction though not true is described as a concrete cancer. A human cancer, if untreated is terminal, whereas the alkali-silica reaction and the expansion it induces, if untreated, eventually stops. No concreted structure or part of a concrete structure any where in the world has collapsed due to alkali-silica reaction alone.

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Alkali aggregate reaction - SlideShare

2018-1-1  Alkali-Aggregate Reaction Is the reaction between the active mineral constituents of some aggregates and the sodium and potassium alkali hydroxide in the concrete Harmful only when it produes significant expansion. 3. FORMS OF ALKALI AGGREGATE REACTIONS Alkali silica reactions alkali-carbonate reaction

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Analysis of the alkali-silica reaction in the Serra dam - 豆丁网

2012-11-7  会议PPT 上传 书房 登录 注册 行业资料 > 化学工业 > Analysis of the alkali-silica reaction in the Serra dam ... (Switzerland). damagecaused damhas samefoundations acceleratingalkali silica reaction conditions applied mortarprisms. madeout twodifferent types ...

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The effects of alkali-silica reaction on the mechanical ...

2019-2-2  Alkali-silica reaction (ASR) of concrete is one of the chemical reactions in concrete that can cause severe damage. In a high-moisture environment, the product of ASR is expansive, which is detrimental to concrete structures [1, 2]. ASR is a chemical reaction between the reactive silica in the aggregate and the alkalis (Na 2O and K 2O) in

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ALKALI AGGREGATE REACTIONS (AAR) IN CONCRETE

2016-9-28  It is well documented that for alkali-silica reaction to occur, three conditions must be present: aggregate with reactive forms of silica, high-alkali (pH) pore solution, and sufficient moisture [2]. In the following a description of each of these factors concerning Finnish practise (reality) is given. Reactive aggregate – Finnish geology

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Alkali-Silica Reaction In Concrete - Civil Engineering ...

Alkali-silica reaction (ASR) in concrete is a reaction between certain silicious constituents in the aggregate and the alkali-sodium and potassium hydroxide which are released during the hydration of Portland cement. A gelatinous product is formed which imbibes pore fluid and in so doing expands, inducing and internal stress within the concrete

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Alkali-Aggregate Reaction (AAR) of Concrete Structures

2013-6-13  alkali content of concrete, use of low alkali cement, include PFA, GGBS, etc. M2: Avoid the presence of a critical amount of reactive silica, e.g. identify non-reactive aggregate M3: reduce the access of moisture and maintain the concrete in a sufficiently dry state, e.g. use external cladding or tanking

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PPT – Lithum Additives: The Cure of AlkaliSilica Reaction ...

The Cure of Alkali-Silica Reaction? What is ASR? How does ASR ... because it has no 'pessimum' effect (increased. gel expansion at lithium doses below threshold ... – A free PowerPoint PPT presentation (displayed as a Flash slide show) on PowerShow - id: 1166bf-MDJjO

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Alkali-Silicate Reaction in Cement Silicon Dioxide ...

2013-11-29  1. ALKALI CONTENT Alkalis are normally present in the cement. Strong alkalinity causes the acidic siliceous material to react Thus greater the alkali content, greater will be the susceptibility of alkali silica reaction. ASTM C150 designates cements with more than 0.6 percent of Na2O as high-alkali cements.

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(PPT) DISTRESS AND MECHANISMS CIVIL ENGINEERING

This alkali-aggregate reactivity has two forms—alkali-silica reaction (ASR) and alkali-carbonate reaction (ACR). (i)Alkali-Silica Reactivity Aggregates containing certain forms of silica will react with alkali hydroxide in concrete to form a gel that swells as it draws water from the surrounding cement paste or the environment. In absorbing ...

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Analysis of the alkali-silica reaction in the Serra dam - 豆丁网

2012-11-7  会议PPT 上传 书房 登录 注册 行业资料 > 化学工业 > Analysis of the alkali-silica reaction in the Serra dam ... (Switzerland). damagecaused damhas samefoundations acceleratingalkali silica reaction conditions applied mortarprisms. madeout twodifferent types ...

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Alkali Silica Reaction (ASR)

2019-7-20  •Add very fine siliceous materials on very fine silica particles will help to suppress a slow and delayed reaction with larger siliceous aggregates on the long term •Another method to reduce the ASR is to limit the external alkalis that come in contact with the system.

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Alkali-Aggregate Reaction (AAR) of Concrete Structures

2013-6-13  alkali content of concrete, use of low alkali cement, include PFA, GGBS, etc. M2: Avoid the presence of a critical amount of reactive silica, e.g. identify non-reactive aggregate M3: reduce the access of moisture and maintain the concrete in a sufficiently dry state, e.g. use external cladding or tanking

Get Price

Analysis of Integral Crystalline Waterproofing Technology ...

2018-10-23  The alkali– silica reaction is the most common form of alkali– aggregate reaction, and in some areas, you can even get an alkali–carbonate reaction, which is a rare form of attack by an alkaline pore solution on certain types of dolomitic limestone. 2.4 Sulphate Attack The deterioration of concrete structures is accelerated when

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Preparation of Silica by Alkaline-Heating and ...

The dissolution rate of silica is expressed as the chemical reaction conversion rate of silica from CSA which reacts with the sodium hydroxide solution. Table 1 shows that the silica mass fraction of CSA is 67.329%. Hence, the dissolution rate of silica can be represented in Eq. 1: R AM M u1 /0.67329 100% 0 (1)

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State-of-the-Art Report on Alkali Silica Reactivity ...

2016-9-27  The alkali-silica reaction (ASR) related distress is a matter of great concern to the concrete industry and regarded as second most deterioration issue after corrosion. Reactive silica in the presence of alkali in the pore-solution inside the concrete creates a hydrophilic alkali-silica gel, often referred to as ASR gel.

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传感器的应用微课.ppt

2017-11-11  骨科常见护理用具的使用.ppt 液压升降机设计论文.doc 美国材料试验协会ASTM C1293-08b Standard Test Method for Determination of Length Change of Concrete Due to Alkali-Silica Reaction.pdf 发电机定子接地保护动作原因分析及故障处理方式.pdf

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PPT – Lithum Additives: The Cure of AlkaliSilica Reaction ...

The Cure of Alkali-Silica Reaction? What is ASR? How does ASR ... because it has no 'pessimum' effect (increased. gel expansion at lithium doses below threshold ... – A free PowerPoint PPT presentation (displayed as a Flash slide show) on PowerShow - id: 1166bf-MDJjO

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alkali aggregate reaction powerpoint - BINQ Mining

2013-3-10  Alkali-Silica Reaction and thereby Effect of Slag on Expansion Due to Alkali - Aggregate Reaction in Microsoft PowerPoint – 03_ACR presentation. ppt

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(PPT) DISTRESS AND MECHANISMS CIVIL ENGINEERING

This alkali-aggregate reactivity has two forms—alkali-silica reaction (ASR) and alkali-carbonate reaction (ACR). (i)Alkali-Silica Reactivity Aggregates containing certain forms of silica will react with alkali hydroxide in concrete to form a gel that swells as it draws water from the surrounding cement paste or the environment. In absorbing ...

Get Price

Analysis of the alkali-silica reaction in the Serra dam - 豆丁网

2012-11-7  会议PPT 上传 书房 登录 注册 行业资料 > 化学工业 > Analysis of the alkali-silica reaction in the Serra dam ... (Switzerland). damagecaused damhas samefoundations acceleratingalkali silica reaction conditions applied mortarprisms. madeout twodifferent types ...

Get Price

Alkali Silica Reaction (ASR)

2019-7-20  •Add very fine siliceous materials on very fine silica particles will help to suppress a slow and delayed reaction with larger siliceous aggregates on the long term •Another method to reduce the ASR is to limit the external alkalis that come in contact with the system.

Get Price

Alkali - Silica Reactions

2012-1-31  Alkali - Silica Reactions

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Measures to prevent damage to concrete by alkali-silica ...

2012-11-8  Measures to prevent damage to concrete by alkali-silica reaction. Recommendation89 Recommendation89 (second, revised edition) Measures preventdamage alkali-silicareaction (ASR) CURRecommendation indicates which procedure should followedwhen designing concrete compositions preventdamage alkali-silicareaction (ASR). ASR chemicalreaction ...

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G CEMENT - Geopolymer

by the deleterious Alkali-aggregate reaction, coined AAR or Alkali-silica reaction coined ASR (see for example the RILEM Committee 219-ACS Aggregate Reaction in Concrete Structures [6]), the wording alkali-activation has a negative impact on civil engineers. Nevertheless, several cement scientists continue to promote the idea of

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Analysis of Integral Crystalline Waterproofing Technology ...

2018-10-23  The alkali– silica reaction is the most common form of alkali– aggregate reaction, and in some areas, you can even get an alkali–carbonate reaction, which is a rare form of attack by an alkaline pore solution on certain types of dolomitic limestone. 2.4 Sulphate Attack The deterioration of concrete structures is accelerated when

Get Price

传感器的应用微课.ppt

2017-11-11  骨科常见护理用具的使用.ppt 液压升降机设计论文.doc 美国材料试验协会ASTM C1293-08b Standard Test Method for Determination of Length Change of Concrete Due to Alkali-Silica Reaction.pdf 发电机定子接地保护动作原因分析及故障处理方式.pdf

Get Price