Methods of limiting hydroxyl ion concentrations or their effects in concrete pore solutions to interfere with alkali silica reaction
US8021477B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Feb 6, 2007 |
| Grant date | Sep 20, 2011 |
| Priority date | — |
| Expiry date | Nov 6, 2029 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B41/64
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Methods of reducing hydroxyl ions in concrete pore solutions are provided. Such methods are useful in providing resistance to gels which form in concrete due to the alkali-silica (ASR) reaction. The methods comprise adding a salt or mixture thereof to the concrete, in aqueous or solid form, the salt or salt mixture having cations higher in valence than the anions. The methods also comprise adding an acidic phosphate or a silicon-containing alkoxide to the concrete. The methods further comprise resisting and/or inhibiting ASR in airfield runway concrete pore solutions by applying a soluble salt or a mixture of soluble salts in solution or a deicing salt mixture in situ to the runway concrete. All of the above methods are useful in reducing hydroxyl ions in concrete. Such methods can be used to resist ASR in fresh concrete, in concrete that is setting, or in hardened concrete.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.