LS Lockup - Water-based Lithium and Silicontate Densifier
Trinic LS Lockup is a single component ready to use water based lithium and siliconate based solution designed to densify and add waterproofing characteristics to cement and concrete substrates.
The densifier reacts with the cementitious ingredients to densify and add water repellency while allowing deep penetration to chemically harden and fortify the substrate.
After the chemical reaction occurs, the substrate will be more abrasion resistant and help protect the surface from wear, moisture and efflorescence while remaining breathable.
What densifier works better on what concrete?
Very few projects are going to specify a minimum compressive strength of 5,500 PSI just so the floor can be polished without using a densifier. Some overlay products made do not contain Portland cement. With the increasing use of pozzolans in concrete there is less reactive free lime for conventional densifiers to work with on “standard” concrete. There are also very weak floors (some almost hard sand like in their density) being rescued by floor polishing. The answer is all densifiers work, some work better than other in different situations.
Pozzolans and densifiers do similar things internally verses externally. The majority of products added to mixes or used as densifiers are silica based (or course there are exceptions). Pozzolans have a silica component, Slag is about 40% silica (varies with source), Silica Fume about 95% silica. The smaller the particles are the faster they react, in many cases getting small enough to actually act as accelerators rather than retarding the set.
Many polished concrete products are also silica based: it started with sodium silicates, then potassium silicates, now on to lithium silicates and colloidal silica. The first three have a metallic salt component, that’s why they can cause efflorescence (less so with Lithium Silicate – Trinic LS Lockup) if over applied. Why did this floor white out when the last did not even though I applied the densifier the same way? – The answer may have been differing porosity and free lime available in the floors.
If your floor is dense (PSI wise) and has enough free lime to work with, lithium silicates (Trinic LS Lockup) or colloidal silicas (Trinic CS Densifier) generally work fine. If your floor contains very little free lime (was cast with a very high pozzolan dosage) or is weak (PSI wise), or very young, you may need to look for alternatives or in many cases a combination of alternatives.
Trinic CS Densifier is a Colloidal Silica which is pure silica with a particle 100 times finer than silicates and 1,000 times finer than silica fume (which is finer than tobacco smoke), silica fume is 100 times finer than Portland cement which is the rough equivalent size of the grit on 300 grit sand paper – you get the point. This is why it reacts quickly when as a surface densifier (it begins to gel almost upon contact). It will also form bonds with silica which is important on floors with little free lime to work with or overlays with no Portland cement.
If your floor (or overlay) contains no Portland cement, if your floor was cast with a high percentage of pozzolan (in my area they use up to 50% fly ash), if your floor is young (calcium hydroxide needs time to develop internally), if you’ve got a decently hard floor in good shape and you don’t want to use diamonds, then Trinic CS Densifier would be a good choice.
We engineered Trinic CS Densifier to contain a range of particle sizes (from 1 nanometer to 100 nanometers) in a specific PH to prevent molding. Our research has found this to be more effective and efficient than typical colloidal silica densifiers which contain a narrow range of particle sizes, its particle packing on a nano-scale. The range of particles fit the pores in a floor like locks in a key allowing the contractor to densify a broad range of floor types. The problem occurs when the key is too small to fit the lock; the colloidal silica can disappear into the concrete without effect to the surface.