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Ground Glass Pozzolans for Sustainable Concrete
On May 20th, Louis Grasso of Urban Mining Industries, will present an AIA credited program titled “Ground Glass Pozzolans for Sustainable Concrete,” at Citrus Restaurant in Milford, CT that was cancelled in March.
Course Description: Ground Glass Pozzolans (GGPs) replace up to 50% of the cement in concrete. The cement component of concrete imparts a large Global Warming Potential (GWP) and replacing the cement with GGPs dramatically reduce concrete’s GWP. GGPs are made from recycled post-consumer bottle glass that would otherwise be landfilled. The glass is sourced regionally, GGPs are manufactured locally and distributed regionally – this constitutes the perfect circular economy. GGPs produce a stronger and more durable concrete with extreme resistance to chloride penetration (road salts), sulfate attack and freeze/thaw damage from water penetration.
Learning Objectives:
Learning Objective 1: Provide an understanding of how pozzolans work in concrete. Topics covered are the history of pozzolans, the definition of a pozzolan from ASTM C 125 and the definition of a Ground Glass Pozzolan (GGP) from ASTM C 1866. The chemistry of how pozzolans work in concrete is described.
Learning Objective 2: Provide an understanding of the industry solutions created by the manufacture of GGPs and their use in concrete. The recycling of curbside-collected glass is problematic for Material Recovery facilities (MRFs) because the glass is dirty and colors are mixed together. Additionally, glass cullet made to be remelted into bottles requires color separation and a minimum size of 3/8”. GGPs solve these problems because color separation is not required and glass particles much smaller than 3/8” can be utilized, hence very little glass gets landfilled. The pozzolan industry has been dominated by fly ash and slag, which are both severely declining in production. GGPs help fill this void when it is needed most. Finally, cement has a very high Global Warming Potential (GWP) and replacing cement with GGPs dramatically reduces the GWP of concrete.
Learning Objective 3: Technical concrete performance data using GGPs as cement replacement are discussed including Rapid Chloride Permeability Test (ASTM C1202), expansion due to sulfate attack (ASTM C1012), compressive strength (ASTM C39), Free Shrinkage (ASTM C 157), Freeze-Thaw Cycling Test of Durability (ASTM C 666). Other third party performance data are presented. Urban Mining Industries was instrumental in creating and passing ASTM C1866 Standard Specification for Ground-Glass Pozzolan for Use in Concrete. The technical requirements of this standard are discussed and compared to ASTM C618 the standard specification for fly ash used in concrete.
Learning Objective 4: Examples of the actual use of GGPs in concrete products are presented including a multitude of projects where concrete block and pre-stressed plank are the primary structural components of the projects. The first ever cast-in-place use of GGPs was demonstrated by the Durst Organization for all the high-strength structural concrete in their Halletts Point project in Queens. 2.2 million square feet of 6000-PSI floor slabs were cast using GGPs in the JP Morgan Chase Global HQ project in Manhattan.
Cost for dinner and program is $40 (cash or check please).
Social ½ hour/networking and tabletop display will be from 6:00 to 6:30. Program will start at 6:30.
Please make your reservations with me at rolsen@jcj.com or 860-240-9335 by no later than 5:00 end of day Friday, March 14th.