Concrete Shrinkage and Cracks

I had a college professor that said concrete was guaranteed to do two things…harden and crack. Hardened concrete is the result of hydration, a chemical reaction between cement and water. The loss of water from the concrete as it cures results in a reduction in concrete volume, or shrinkage.

PFAS in New York State

Per- and Polyfluoroalkyl Substances (PFAS) are a group of man-made chemicals, including perfluorooctanesulfonic acid (PFOS) and perfluorooctanoic acid (PFOA), used in the production of a wide variety of consumer goods. PFAS have been commonly found in food packaging, household cleaning products, stain repellents, pesticides, and fire-retarding foam. PFAS can collect in water and soil, where the contaminants enter the food chain or are directly consumed by humans.

NYSDOT UPDATES COARSE AGGREGATE SPECIFICATION 703-02

As previously required for No. 2 Stone, NYSDOT now requires No. 1 Stone to be tested for Freezing and Thawing (NY 703-08 P,G) and 10-Cycle Magnesium Sulfate Soundness (NY 703-07 P,G). Additional qualification requirements are presented in NYSDOT Standard Specification, Section 703-02 “Coarse Aggregate” and Table 703-2 “Coarse Aggregate Physical Requirements”.

Hot Weather Concrete

The American Concrete Institute (ACI) defines ‘Hot Weather’ as high ambient temperatures, high concrete temperatures, low relative humidity, high wind speed, solar radiation, or any combination that will impair the quality of concrete due to accelerated moisture loss and/or cement hydration. Most summer days in New York State would qualify as ‘Hot Weather’, using ACI’s definition.