alkali aggregate reaction ppt

  • Alkali aggregate reaction SlideShare

    01/01/2018· Alkali aggregate reaction 1. BY AKRAM AFRIDI 2. 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

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  • Lectures No. 09 & 10 KFUPM

    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. This form is more serious and common than ACR

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  • PPT Lecture No. 09-10 PowerPoint presentation free to

    Lecture No. 09-10 Subject: Alkali-Aggregate Reactivity Certain constituents in aggregates can react harmfully with alkali hydroxides in concrete and cause significant A free PowerPoint PPT presentation (displayed as a Flash slide show) on PowerShow id: 78dc5a-NDkxZ

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  • Alkali Aggregate Reaction Materials Chemical Compounds

    Alkali aggregate reaction • Alkali aggregate reaction is a term mainly referring to a reaction which occurs over time in concrete between the highly alkaline cement paste and non crystalline silicon dioxide, which is found in many common aggregates. • This reaction can cause expansion of the altered aggregate, leading to spalling and loss of strength of the concrete.

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  • PPT Alkali-Silica Reaction: PowerPoint presentation

    ASU/ACS/99. Chemistry of Alkali Silica Reaction PowerPoint PPT presentation free to view . ASR Title: Lectures No. 09 & 10 Author: Mesfer M. Al-Zahrani Last modified by: kfupm-itc999 Created Date: 9/29/2004 7:29:09 AM Document presentation format PowerPoint PPT presentation free to view . Bowens Reaction Series Bowens Reaction Series PowerPoint PPT presentation free to view

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  • ALKALI AGGREGATE REACTIONS (AAR) IN CONCRETE

    Alkali-Aggregate Reactions (AAR) cause severe damage in concrete structures worldwide [1- 8] Alkali-aggregate reaction (AAR) is an internal chemical reaction between the alkaline components in the cement and certain active mineral constituents in some aggregates[1].

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  • Alkali-Aggregate Reaction

    This alkali-aggregate reaction has two forms: alkali-silica reaction (ASR) and alkali-carbonate reaction (ACR). Alkali-silica reaction (ASR) is of more concern because aggregates containing reactive silica materials are more common. In ASR, aggregates containing certain forms of silica will react with alkali hydroxide in concrete to form a gel that swells as it adsorbs water from the

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  • PPT Lecture No. 09-10 PowerPoint presentation free

    Lecture No. 09-10 Subject: Alkali-Aggregate Reactivity Certain constituents in aggregates can react harmfully with alkali hydroxides in concrete and cause significant A free PowerPoint PPT presentation (displayed as a Flash slide show) on PowerShow id: 78dc5a-NDkxZ

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  • Alkali Aggregate Reaction Materials Chemical

    Alkali aggregate reaction • Alkali aggregate reaction is a term mainly referring to a reaction which occurs over time in concrete between the highly alkaline cement paste and non crystalline silicon dioxide, which is found in many common aggregates. • This reaction can cause expansion of the altered aggregate, leading to spalling and loss of strength of the concrete.

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  • Lecture -ASR-9 (1).ppt ASR Subject Alkali-Aggregate

    View Lecture -ASR-9 (1).ppt from CE 303 at King Fahd University of Petroleum & Minerals. ASR Subject: Alkali-Aggregate Reactivity Certain constituents in aggregates can react harmfully with alkali

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  • Chemical attack in concrete SlideShare

    Alkali-Aggregate Reaction • Chemical reactions between aggregate containing certain reactive constituents and alkalis (sodium and potassium salts) and hydroxyl ions released by the hydration of cement can have deleterious effects on concrete. •Granite, granite gneiss and schist, quartzite and sandstone, containing strained quartz are among the reactive rocks found in India. 15. Alkali

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  • Standard approach to assessing Alkali Aggregate

    What are alkali–aggregate reactions 2. Objective of study 3. Adopted approach 4. Review normative approach in Europe and North America 5. Test and specifications for aggregate reactivity 6. Conclusions. 2. EXAMPLE 1 EXAMPLE 2 (Vahanen Oy) 1. What are alkali –aggregate reactions • Alkalies producing a silica -gel by dissolving soluble SiO 2 (e.g. Quartz) in the aggregate • Gel has

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  • Durability of Aggregates

    -alkali-aggregate reaction. Popouts . Tests on Aggregates Bulk Density (ASTM C 29) • Defined as the weight of the aggregate particles that would fill a unit volume. The term bulk is used since the volume is occupied by both the aggregates and voids. The typical bulk density used in making normal concrete ranges from 1200 to 1750 kg/m3. • The void contents range between 30% to 45% for

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  • Cracks In Concrete Types 7 Major Causes Remedies PPT

    07/10/2020· Alkali Aggregate reaction. Measures to prevent the effects of the chemical reaction: For concrete used in foundation, if the soil has a sulfate content of more than 0.2% or water sulfate content exceeds 300 rpm, high density concrete or sulfate resisting cement should be used. Bricks used in superstructures should not have more than 3% soluble salts per annum. Expansion joints should be

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  • Alkali Aggregate Reaction in Concrete Types, Causes,

    Alkali aggregate reactions (AAR) occur when aggregates in concrete react with the alkali hydroxides in concrete producing a hygroscopic gel which, in the presence of moisture, absorbs water and causes expansion and cracking over a period of many years. This alkali-aggregate reaction has two forms, namely: Alkali-silica reaction (ASR) and

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  • What Is Alkali Aggregate Reaction In Concrete? [Civil

    The chemical reaction between the concrete aggregates and alkali hydroxide with the help of environmental moisture that leads to cracks on the concrete surface over a period is known as the alkali-aggregate reaction. The appearance of crack seems like a random map, as shown in the above picture.

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  • Beton 7 durab pt2.ppt [Read-Only]

    Alkali aggregate reaction AAR Alkali silica reaction ASR Granulats contenants du silice amorphe ou mal crystallisé Solution poreuse de pH élevé + L’eau “gel”, forte teneure en eau gonflement. Manifestation microscopique: Manifestation macroscopique: Misalignment (Distorsion) ASR. Distribution des Fissures “Map Cracking” Cl -Gel CO 2 La fissuration peut augmenter les autres

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