Alkali
Definition and meaning of Alkali in real estate.
Alkali refers to mineral salts found in soil and groundwater, particularly in dry and arid regions, that can negatively impact plant growth and building materials. In high concentrations, these salts can damage concrete foundations and pipes.
In more detail
When purchasing land or homes in the western United States, buyers and builders must be aware of soil alkalinity. High alkali content can lead to concrete spalling, a process where the concrete chips, flakes, or deteriorates over time. This chemical reaction is known as alkali-silica reaction or sulfate attack.
To mitigate these risks, builders must use specialized sulfate-resistant concrete when pouring foundations in high-alkali areas. For agricultural land, high alkalinity makes the soil less fertile, requiring treatments like gypsum to adjust the pH level for farming.
Key facts
| Category | Property Types & Construction |
|---|---|
| Primary risk | Deterioration of concrete foundations and metal pipes |
| Common location | Arid and semi-arid regions of the western United States |
| Mitigation | Use of sulfate-resistant cement and soil treatments |
A home builder conducts a soil test on a new lot and discovers high alkali levels, prompting them to use sulfate-resistant cement for the home's foundation to prevent future cracking.
Frequently asked questions
How does alkali damage a concrete foundation?
Water dissolves alkali salts in the soil, which then penetrate the concrete and react chemically, causing the concrete to expand, crack, and lose structural strength.
Can you grow crops in high-alkali soil?
Most crops struggle in highly alkaline soil, but soil amendments like sulfur or gypsum can be added to lower the pH and make the land productive for farming.