Sessions & Events

 

Please note: All sessions and events take place in Central Daylight Time: CDT (UTC-5).

H=Hyatt Regency Dallas; U=Union Station

Sustainability and Resiliency of the Built Environment Using Concrete and Cement-Based Composites

Sunday, October 23, 2022  3:30 PM - 5:30 PM, H-Reunion B

This session focuses on the role of concrete and cement-based composites on the sustainable built environment.
Learning Objectives:
(1) Review new trends and challenges of designing with use of recycled compacted concrete;
(2) Develop insight into new innovative technical approaches that greatly improve designing by the use of recycled waste in concretes;
(3) Discuss the key environmental benefits and energy savings when recycled materials are implemented;
(4) Identify the social advantage of repurposing materials in concretes.

This session has been AIA/ICC approved for 2 CEU/PDH credits.


Implication of Mixture Overdesign and Embodied Solutions in Achieving Carbon Neutral Concrete in the US

Presented By: Julie Buffenbarger
Affiliation: Beton Consulting Engineers
Description: The overdesign of concrete mixtures and poor acceptance testing significantly detract from sustainable concrete construction. Thus, while the cement and concrete industry has consistently reduced its energy and carbon footprint, reaching carbon neutrality will require significant advances throughout the industry. In this presentation, the impact of overdesign on the embodied impact of concrete at the national and project scales is discussed. In addition, based on a review of a comprehensive field survey, different determining factors in the concrete overdesign are presented. These criteria include the established ACI and ASTM standards and their role in acceptance testing in the building codes, the reliance on proper acceptance testing by the Licensed Design Professional, Building Code Official, and the project owner, and the attributed carbon footprints of overdesign. The results of our field survey, conducted on over 100 projects documented the quality of field testing in Pennsylvania, reveal that only 15% percent of the projects met the testing criteria within the ASTM and building code requirements. The total overdesign-induced cement consumption is estimated as large as 6.7% of the cement used in the US. To contextualize the role of overdesign in the carbon neutrality of the US concrete, the effectiveness of decarbonization solutions and their simultaneous interactions are elaborated from a cradle-to-gate scope. In this presentation, we argue that carbon-neutral concrete mixtures can be achieved when multiple solutions for reducing, avoiding, and offsetting the embodied impact are applied simultaneously, including 100% renewable electricity. Nevertheless, the scope of analysis for assessing the carbon neutrality of concrete infrastructure and buildings should be beyond the embodied impacts and incorporate the use phase emission and service life alterations in the analysis to answer this important question from a life cycle perspective.


The Key Role of Limestone Calcined Clay Cements on the Roadmap Towards Eco-Efficient Cement and Concrete

Presented By: Franco Zunino
Affiliation: ETH Zurich
Description: Affiliation of both authors: Laboratory of Construction Materials, École Polytechnique Fédérale de Lausanne, EPFL STI IMX LMC, Lausanne, Switzerland Concrete is the substance most consumed by humanity after water. Blended cements in which part of the energy intensive clinker is replaced by supplementary cementitious materials (SCMs) are the by far the most realistic means to obtain large scale CO2 reductions in the short-to-midterm, attending the urgency of the climate emergency. LC3, blended cement produced by the combination of limestone, calcined clays and Portland cement provides a solution that achieves equivalent mechanical performance to OPC, better durability against chloride and ASR and a reduction of CO2 emissions by about 40%. Due to the similarities of LC3 with OPC, it is a material that can be adopted today using the same construction equipment and workforce worldwide. In the last part of the presentation, we offer a critical review of other trending technologies aimed to reduce the carbon footprint in construction.


Sustainability of Cement and Concrete Materials for Pavement Applications: Agencies’ and Industry Perspective on Viable Solutions

Presented By: Milena Rangelov
Affiliation: Federal Highway Administration- NRC
Description: Sustainability is becoming an important engineering and organizational priority worldwide. A closer look into different strategies that are pertinent to cement and concrete in the context of pavement infrastructure merit analysis and consideration. Even though sustainability has been an aspirational goal for many years, without proper quantification and assessment it is not possible to gauge the merit of various solutions and technologies. This study is focused on readily available technologies and solutions that can support sustainable outcomes in the domain of concrete pavements. These solutions were identified through an interactive workshop that included experts from industry, owner agencies, and academia from the domain of concrete pavements. Identified technologies were assessed for their readiness, potential benefits, and implementation challenges. The potential benefits of select identified solutions were demonstrated using life cycle assessments to compare US-specific paving concrete mixtures.

Upper Level Sponsors

Ash Grove
Baker
Conseal
Controls Group
Euclid Chemical
GCP
Master Builders
PoreShield
PS=0
ACI Northeast Texas Chapter

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