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The Official Publication
of the Mason Contractors
Association of America
Linking Permeability, Durability and Sustainability
With sustainability in mind, integral crystalline concrete waterproofing products were used to restore this 110-year-old mill. The Royal Mills restoration was the winner of the 2010 New England ICRI Project of the Year.
With an increase in the residential building market forecasted for 2014, the demand for concrete across North America is expected to follow suit. Extensive evidence shows us that concrete structures around the world are not meeting their designed service life, due to rapid deterioration – all of which is caused by the transport of fluids and moisture through the concrete. Concrete structures have traditionally had a design life of 50 to 100 years. Unfortunately, many of today’s structures are not living up to expectations.
Sources of concrete deterioration
Contaminants such as salt will corrode the steel reinforcement within the structure, and can be introduced through water or moisture carrying them through capillary pores within the concrete. Sulfate contaminants, alkali reactive aggregates, and water can cause disruptive expansion, once absorbed by the sponge-like concrete pores.
When designing and building a structure, mitigating water ingress through concrete is critical to the project’s overall integrity and durability
Permeability, durability and sustainability
As the permeability of concrete directly affects the structure’s overall durability, it is critical to mitigate water’s ability to infiltrate through permeability in order to increase durability and, thus, support the sustainability of these types of infrastructure. Sustainability is a concern, now more than ever, with infrastructure expansion and population growth occurring worldwide.
The durability and longevity of a structure directly impacts the environmental footprint that structure creates. By using sustainable practices and materials that enhance the durability of our infrastructure, we are supporting a long-term initiative toward building better, longer lasting cities.
So what choices do we have when selecting a product that will address these concerns? Creating a durable structure is more than just applying a one-size-fits-all solution and forgetting about it. To prevent the destruction caused by water permeability, the immediate and future purpose of the structure – as well as its unique location needs and water infiltration risks – must be carefully evaluated.
If a structure is at high risk of water permeation, selecting the appropriate waterproofing product can greatly reduce the need for costly repairs or premature replacement.
Protecting concrete from water has traditionally been accomplished by separating it with a membrane of some kind. Typically, membranes are applied to the concrete surface either as a liquid coating or as flexible sheets joined together. While they have been used in many projects, these approaches have a few common setbacks:
Desirable properties in a sustainable concrete waterproofing solution
Permeability Reducing Admixtures are outlined by the American Concrete Institute’s 212.3R-10 Report on Chemical Admixture as PRAH and PRAN classifications.
PRAH: Permeability Reducing Admixture –
Other desirable properties to look for in a sustainable concrete waterproofing solution include:
|Last Updated on Monday, 03 March 2014 19:33|