Patience is a Virtue - Testing Confirms Liquid Hardeners Realize Maximum Performance When Applied After 28 Days
A growing trend within the concrete flooring industry is to apply liquid hardeners on freshly-troweled concrete in what is referred to as a “pre-seal” or a “cure-coat.” Conversely, Nox-Crete has historically advised applicators to wait and apply liquid floor hardeners a minimum of 28 days after concrete placement to allow for maximum performance. The 28 day recommendation was based on intuition and a strong understanding of the chemistry behind liquid floor hardeners and the means by which they densify concrete surfaces. The lack of conclusive data led Nox-Crete to not only ask but to answer the question, does the timing of the application (Day One vs. Day 28) impact the liquid floor hardener’s ability to improve abrasion resistance? Continue reading →
Concrete floors are subjected to continuous wear, from heavy equipment in the manufacturing world to the retail industry’s constant foot traffic. In response, many design professionals use liquid floor hardeners or densifiers to increase protection against potential damage and premature wear of the slab surface.
The Standard for measuring the effectiveness of curing compounds has historically been ASTM C 309, “Standard Specification for Liquid Membrane-Forming Compounds for Curing Concrete.” The test procedure for this specification measures the moisture loss of a test specimen that has a wood float finish and utilizes a liquid membrane-forming compound. While this Standard has proven to be an effective measure to gage acceptable curing products for concrete, developments in the placement/finish of concrete and advancing technologies of concrete chemicals have paved the way for innovative perspectives on curing of concrete, particularly as it pertains to industrial floors.