What does ASR mean in CHEMISTRY
Alkali-silica reaction (ASR) is a form of chemical reaction that can occur between certain types of concrete and aggregate, often in the presence of moisture. This reaction results in internal expansion within, and deterioration of, the concrete and can eventually cause cracking and other forms of material failure.
ASR meaning in Chemistry in Academic & Science
ASR mostly used in an acronym Chemistry in Category Academic & Science that means Alkali-Silica Reaction
Shorthand: ASR,
Full Form: Alkali-Silica Reaction
For more information of "Alkali-Silica Reaction", see the section below.
Essential Questions and Answers on Alkali-Silica Reaction in "SCIENCE»CHEMISTRY"
What is alkali-silica reaction?
Alkali-silica reaction (ASR) is a type of chemical reaction that occurs between certain types of concrete and aggregate when exposed to water. This reaction causes internal expansion within the concrete, which can lead to cracking and other forms of material failure.
What are some common causes of ASR?
ASR is most commonly caused when reactive silica-based aggregates react with alkaline materials in cement paste or mortar. High water content in the mix, long term exposure to moisture, poor curing techniques, high temperatures or temperature changes all contribute to ASR. Additionally, certain admixtures may also increase the risk for alkali-silica reactions.
How do you test for ASR?
Testing for alkali silica reactivity typically involves laboratory tests such as petrography analysis or lithium metaborate titration to measure a sample's propensity for ASR activity. Field testing involves observing signs of distresses such as cracks over time to determine if an existing structure has been affected by ASR.
How can I prevent alkali-silica reactions?
Preventing alkali silica reactions involves proper selection and preparation of aggregates before use as well as implementing proper construction practices including adequate curing methods for new structures and keeping existing structures dry with good drainage systems. Additionally, using pozzolans or mineral admixtures may help offset the effects from any potential deleterious reactions from ASR tendencies.
Are there repair options for existing structures affected by ASR?
Repair options will depend on several factors including severity of damage as well as available resources such as budget, timeline etc., but several methods exist including crack injection using either epoxy resins or polyurethane foam systems which can provide structural stability until full replacement is possible.
Final Words:
In summary, alkali-silica reactions are chemical processes that occur between certain types of concrete components resulting in internal expansion and eventual deterioration of a structure's integrity. To reduce such risks it is imperative to select reactive silicas carefully along with proper construction methods in order to respond quickly at the first signs of damage should it arise.
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