ASR Inhibitor (Lithium Nitrate for Alkali-Silica Reaction)
CAS Number: 7790-69-4
Lithium nitrate-based ASR inhibitor prevents alkali-silica reaction (ASR) in concrete by altering the chemistry of the reactive gel formed between alkali hydroxides and reactive silica aggregates, preventing the expansive gel from absorbing water and causing cracking. It is the most effective and widely used chemical solution for ASR mitigation and is applied at dosages based on the Li/(Na+K) molar ratio, typically 0.74 or higher.
Technical Specifications
| pH | 7.0-8.5 |
| appearance | Clear colorless solution |
| specific gravity | 1.22–1.24 |
| chloride content (%) | ≤0.01 |
| lithium nitrate content (%) | 30±1 |
Applications
- New concrete using ASR-susceptible aggregates
- Highway and airport pavement concrete
- Dam and large infrastructure concrete
- Bridge foundations and substructures
- Concrete in regions with known reactive aggregate deposits
Key Features
- Most scientifically proven chemical mitigation for ASR
- Effective even with highly reactive aggregates
- Does not significantly affect other concrete properties
- Compliant with ASTM C1240 and ACI 221.1R guidelines
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