This session will delve into recent advancements in technologies for utilizing ground glass pozzolans (GGP) in the production of low-carbon concrete. Key topics include the assessment of pozzolanic reactivity and the performance of GGP-blended cements in relation to concrete’s fresh properties, hardened properties, and durability. Special focus will be given to critical mechanisms impacting concrete durability, such as alkali-silica reaction (ASR), transport properties, chemical resistance, and corrosion resistance. Technical presentations will be provided by leading researchers, practicing engineers, and manufacturers actively working with GGPs.
Learning Objectives:
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1) Discuss the latest insights from the forthcoming ACI 240 report on GGP;
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2) Recognize the challenges in producing specification-compliant GGPs for concrete applications;
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3) Assess the adequacy of current standard testing methods and specifications for GGPs;
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4) Evaluate the role of GGPs in the development of performance-based concrete mixtures.
This session has been approved by AIA and ICC for 2 PDHs (0.2 CEUs). Please note: You must attend the live session for the entire duration to receive credit. On-demand sessions do not qualify for PDH/CEU credit.
Looking Back on 20 Years of Experience in the Development of Ground Glass Pozzolan
Presented By: Arezki Tagnit-Hamou
Affiliation: University of Sherbrooke
Description: This presentation is a review of the research done in the SAQ chair on glass valorisation in concrete. Here we will present the results of fundamental research and the fresh and hardened properties of ground glass pozzolan in concrete and its durability as well as the in situ testing and technology transfer. These results helped in the development of standards for ground glass pozzolan in CSA and ASTM.
Connecting Laboratory and Field Performance of Concrete Made with Ground Glass Pozzolan
Presented By: Matthew Adams
Affiliation: New Jersey Institute of Technology
Description: Ground glass pozzolans (GGP) are rapidly becoming a vital tool in the move towards sustainable concrete with reduced embodied carbon and alleviating potential supply issues associated with traditional pozzolans. The lack of data connecting trial batches and laboratory performance to field performance is limiting the adoption of the material. As part of a larger study of potential lower-carbon concrete systems for use in the NYC metro region, we completed laboratory studies of several concrete systems incorporating GGP. Mechanical properties, fresh properties, and durability properties were measured. The laboratory study was followed by field trials, where sidewalk slabs along a busy airport road were cast and are being monitored on a regular basis. The same laboratory tests completed for the original study were also completed on specimens created from the field trial. This presentation will present results from both the laboratory and field studies. A discussion of performance differences between lab-mixed and ready-mixed systems will be provided. Finally, some best practices for scaling up laboratory studies will be presented based on lessons learned from this work.
Innovative Performance-Based Approach for Effective Utilization of Ground Glass Pozzolan for ASR Prevention in Job Mixtures
Presented By: Anol Mukhopadhyay
Affiliation: Texas A&M Transportation Institute
Description: This study presents a comprehensive evaluation of the ASR prevention effectiveness of a Ground Glass Pozzolan (GP) in combination with Metakaolin (MK), Silica Fume (SF), and Colloidal Silica (CS) in a job concrete mixture containing a very highly reactive (R3) coarse and a reactive (R2) fine aggregate. The studied SCMs were characterized for mineralogy, reactivity, pozzolanicity, and soluble alkalis. Eleven binary/ternary mixtures were evaluated using a combined approach of estimating pore solution chemistry (PSC) by thermodynamic modeling and testing by the AASHTO TP 142 (ACCT) and ASTM C 1567 (AMBT) methods for their effectiveness in preventing ASR. Binary/ternary combinations of MK with SF and CS were found to be highly effective in PSC reduction and ASR prevention. In contrast, the effectiveness of GP in preventing ASR depends on the degree of alkali dissolution and alkali binding through pozzolanic reactions. Binary mixtures with GP replacements of up to 45% were inadequate to prevent ASR for this R3-R2 aggregate combination. However, ternary mixes with 8% SF and 5% CS were effective in significant reduction of ASR expansion while the GP-MK combinations (10-15% MK) were effective in fully preventing ASR. More evaluation using our combined approach with selective validation by the concrete prism test (CPT) for potential GP sources as a function of aggregate reactivity (R3-R1) is recommended to ensure the effective utilization of GPs for ASR prevention in job mixtures.
End-of-life Solar Panel Glass as a Building Material: Reducing CO2 Emissions & Improving Resource Efficiency
Presented By: Raissa Ferron
Affiliation: University of Texas at Austin
Description: Waste solar glass from decommissioned photovoltaic panels is an emerging environmental concern, projected to reach 10 Mt per year by 2050 in the USA, while the concrete industry faces supply constraints for traditional supplementary cementitious materials (SCMs), such as fly ash. This study evaluates finely ground waste solar glass (< 45 µm) as a supplementary cementing material (SCM) and compares its performance with ground glass pozzolans used in the construction industry (reference glass).
Advancing Portland Cement Concrete Sustainability with Ground-Glass Pozzolans
Presented By: Prasada Rangaraju
Affiliation: Clemson University
Description: Concrete industry is actively exploring environmentally friendly supplementary cementitious materials (SCMs) to supplement Portland cement and traditional SCMs like fly ash, aiming to enhance the mechanical and durability properties of concrete while reducing its carbon footprint. With the availability of conventional SCMs such as fly ash and slag becoming increasingly unpredictable, extensive research has demonstrated that processed glass waste from various sources can serve effectively as alternative pozzolans in concrete applications. Building on findings from past studies and practical field applications, ASTM Subcommittee C09.24, focused on Supplementary Cementitious Materials, has developed ASTM C1866/C1866M-20: “Standard Specification for Ground Glass Pozzolan for Use in Concrete.” This presentation will delve into the role of glass-based pozzolans in influencing the fresh and hardened concrete properties, as well as the promising future of ground-glass pozzolans as sustainable low-carbon SCMs within the concrete sector.
High Performance Ground Glass Pozzolan
Presented By: Craig Szabo
Affiliation: Opta Waterdown Inc
Description: Opta Glass of Waterdown, ON produces an ultra-high ground glass pozzolan with an LOI of less than 0.3% and d50 of 3.5 microns at a significant industrial scale. The ASTM C1866 and CSA A3000 SAI properties are well exceeded, and the fresh and early-age concrete performance is exceptional. This product is the stepping stone to new innovative low-carbon glass pozzolan products that are under development. This breakthrough in glass pozzolan technology not only enhances concrete performance but also contributes to the ongoing efforts to reduce the carbon footprint of the construction industry.