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.
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.
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”.
Atlantic Testing Laboratories (ATL) is proud to announce that Steven Moore, PE, has been selected to serve on the ASTM Main Committee C09 (Concrete and Concrete Aggregates) and is a voting member of Subcommittee C09.64 (Nondestructive and In-Place Testing).
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.
Within New York State, construction projects that meet specific soil disturbance parameters are required to obtain SPDES (State Pollutant Discharge Elimination System) Permit approval by the New York State Department of Environmental Conservation (NYSDEC) prior to soil disturbance activity.