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- Alkali–silica_reaction abstract "For less common types of alkali-driven concrete degradation see alkali-aggregate reaction (disambiguation page).The alkali–silica reaction (ASR) is a reaction which occurs over time in concrete between the highly alkaline cement paste and reactive non-crystalline (amorphous) silica, which is found in many common aggregates.The ASR reaction is the same as the pozzolanic reaction, which is a simple acid-base reaction between calcium hydroxide, also known as Portlandite, or (Ca(OH)2), and silicic acid (H4SiO4, or Si(OH)4). For the sake of simplicity, this reaction can be schematically represented as following:Ca(OH)2 + H4SiO4 → Ca2+ + H2SiO42− + 2 H2O → CaH2SiO4 · 2 H2OThis reaction causes the expansion of the altered aggregate by the formation of a swelling gel of calcium silicate hydrate (C-S-H). This gel increases in volume with water and exerts an expansive pressure inside the material, causing spalling and loss of strength of the concrete, finally leading to its failure.ASR can cause serious expansion and cracking in concrete, resulting in critical structural problems that can even force the demolition of a particular structure.The mechanism of ASR causing the deterioration of concrete can be described in four steps as follows: The alkaline solution attacks the siliceous aggregate, converting it to viscous alkali silicate gel. Consumption of alkali by the reaction induces the dissolution of Ca2+ ions into the cement pore water. Calcium ions then react with the gel to convert it to hard C-S-H. The penetrated alkaline solution converts the remaining siliceous minerals into bulky alkali silicate gel. The resultant expansive pressure is stored in the aggregate. The accumulated pressure cracks the aggregate and the surrounding cement paste when the pressure exceeds the tolerance of the aggregate.↑ ↑ ↑ ↑".
- Alkali–silica_reaction thumbnail ASR_cracks_concrete_step_barrier_FHWA_2006.jpg?width=300.
- Alkali–silica_reaction wikiPageID "12484448".
- Alkali–silica_reaction wikiPageRevisionID "592830898".
- Alkali–silica_reaction subject Category:Cement.
- Alkali–silica_reaction subject Category:Chemical_reactions.
- Alkali–silica_reaction subject Category:Concrete.
- Alkali–silica_reaction subject Category:Pavements.
- Alkali–silica_reaction subject Category:Silicates.
- Alkali–silica_reaction comment "For less common types of alkali-driven concrete degradation see alkali-aggregate reaction (disambiguation page).The alkali–silica reaction (ASR) is a reaction which occurs over time in concrete between the highly alkaline cement paste and reactive non-crystalline (amorphous) silica, which is found in many common aggregates.The ASR reaction is the same as the pozzolanic reaction, which is a simple acid-base reaction between calcium hydroxide, also known as Portlandite, or (Ca(OH)2), and silicic acid (H4SiO4, or Si(OH)4). ".
- Alkali–silica_reaction label "Alkali-Kieselsäure-Reaktion".
- Alkali–silica_reaction label "Alkali–silica reaction".
- Alkali–silica_reaction label "Betonrot".
- Alkali–silica_reaction label "Reazione alcali aggregati".
- Alkali–silica_reaction label "Réaction alcali-granulat".
- Alkali–silica_reaction label "アルカリ骨材反応".
- Alkali–silica_reaction sameAs Alkali%E2%80%93silica_reaction.
- Alkali–silica_reaction sameAs Alkali-Kieselsäure-Reaktion.
- Alkali–silica_reaction sameAs Réaction_alcali-granulat.
- Alkali–silica_reaction sameAs Reazione_alcali_aggregati.
- Alkali–silica_reaction sameAs アルカリ骨材反応.
- Alkali–silica_reaction sameAs Betonrot.
- Alkali–silica_reaction sameAs Q2166525.
- Alkali–silica_reaction sameAs Q2166525.
- Alkali–silica_reaction wasDerivedFrom Alkali–silica_reaction?oldid=592830898.
- Alkali–silica_reaction depiction ASR_cracks_concrete_step_barrier_FHWA_2006.jpg.