The biggest difference is the method by which silica is delivered to the calcium hydroxide. Originally, alkali-metal compounds called “silicates” were used: sodium, potassium, and more recently, lithium-silicate. This older technology works but has many drawbacks for contractor and owner:
- high pH levels of working materials (most greater than pH 11)
- high alkaline surface residues
- potential for whiting on the surface that is difficult to remove
- high viscosity requiring time-consuming scrubbing to achieve penetration
- labor-intensive application and rinsing
- extensive delays for dwell times and drying times
- disposal of hazardous slurries creates environmental issues on the job site
Category:
Densifiers