Moisture issues in Concrete - Problems and Resolutions
Moisture problems have increased for a number of reasons:
¨Curing and sealing of concrete; September of 1999 new VOC laws changed both formats and application methods and more than ten years later most do not understand the methods.
¨Fast track construction also really began over the past 20 years. “Time is of the essence” is written in contract documents which put everyone under a certain time frame and general contractors in a bad mood.
¨Lightweight aggregates and aggregates that absorb moisture are being used.
¨Tighter time frames of building construction.
¨EPA restrictions on land results in some buildings being built on marginal land.
¨Changes in concrete mix designs including the use of both slag and fly-ash results in slower cure times. Set retardants and admixtures also have contributed to these issues.
¨Failure of tradesmen to stay abreast of new emerging trends.
The previous has also contributed to moisture vapor transmission problems. Read entire aticle