Alkali silica reactivity

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Rully Lesmana

reaksi yang terjadi jika alkali bertemu dengan silika

Engineering

What is ASR?
is a reaction between alkali hydroxide and Silica
particles from aggregate that happened in
concrete

Why is it dangerous?
Because :
• 1. Alkalies + Reactive Silica → Gel Reaction Product
• 2. Gel Reaction Product + Moisture → Expansion

Illustration
concrete
Reaction
Alkali-silica
gel Gel absord
water Gel swells
Crack in
concrete

references
• Types and causes of concrete deterioration,Concrete
Information, Portland Cement Association
• Malvar, L. Javier and Lary R. Lenke, 2006, Efficiency of
Fly Ash in Mitigating Alkali-Silica Reaction Based on
Chemical Composition, ACI MATERIALS JOURNAL
TECHNICAL PAPER.
• https://normanray.files.wordpress.com/2010/10/kuliah
-5a-admixtures.pdf

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