Structurally sound concrete of any age can be polished. The only exception would involve concrete that is damaged to the point that repairs exceed the cost of a new pour or if it is extremely oily. However, there are some guidelines to follow when considering polished concrete.
New concrete requires no special mixes or additives to be successfully polished. It is recommended that all new pours cure for at least 28 days to ensure adequate hardness and curing. New pours can also be poured in a fashion that minimizes surface inconsistencies, thereby reducing the polishing steps needed to achieve the desired level of shine. Densifiers are also usually recommended when polishing a green substrate, resulting in a higher hardness rating and reduced porosity.
Polishing an existing concrete floor requires surface preparation to remove dirt, debris and any previous coatings. Blemishes and unevenness in the slab is also addressed. Densifiers can also be used on an existing floor to decrease dusting and increase the durability of the newly polished floor.
An experienced concrete contractor can review your existing substrate and determine the steps necessary to achieve the degree of shine desired for your application. They can also help determine the cost effectiveness for complicated applications involving extremely wavy, damaged or pitted substrates.
which can be applied to new or existing floors, work by reacting chemically with the concrete to form a hard, crystalline structure. They also prevent dusting of concrete and offer extra protection from water penetration and staining.