The Darwin Bridges
Presented By: Etienne Cantin Bellemare
Affiliation: Ville de Montreal
Description: The two Darwin Bridges are located on Nun's Island in Montreal, QC, Canada. They are the world's first bridges made of concrete with recycled glass powder and among the very rare bridges reinforced exclusively with stainless steel rebar. The equivalent of 70,000 recycled wine bottles was used to build the two bridges. The Darwin Bridges have a design life of 125 years. This project aims to obtain the Envision environmental certification.
Presented By: Juan Carlo Calma
Affiliation: Carlo Calma Consultancy Inc.
Description: Is Infinity House simply a place to live? Or is it, as our studio views it, a living kinetic sculpture and an example of what we call—an architecture of exuberance—an ever-changing performance space—merging art and great engineering that depicts human scale and experiences. It embodies sensual intimate domestic narratives and use, like a vitrine of memories that becomes a sculpture of occupation.
Acoustically Diffuse & Absorbent Lightweight Aerated Concrete (ADALAC)
Presented By: Daniel Butko
Affiliation: The University of Oklahoma
Description: The process and results presented here showcase experimentation with concrete admixtures, overall surface articulation, and form to provide concrete panels which support favorable acoustic interactions (notably through useful Noise Reduction Coefficients). Material experimentation resulted in small amounts of aluminum powder in both ultra-high-performance concrete and commercial-grade concrete which produced hydrogen gas bubbles during hydration, creating surface and internal voids of various sizes. Faculty, students, and industry partners designed and fabricated aerated concrete sawtooth panels linking surface, form, and spatial volume to provide reflection of sound through density, diffusion through the deliberate shaping and contouring of the panels, and absorption through porous surfaces (energy lost by air molecule friction). This trifecta supports speech intelligibility, clarity, and useful sound reflections.The 20 x 20 x 6 ft panels, developed through industry partnerships with Coreslab Structures (OKLA) Inc. precast concrete fabricator and US Formliner Inc. (RECKLI), are the result of data-driven design, real time analysis, software verification, and laboratory test results. The research and resultant panels were benchmarked against various published resources which define: 1) the acceptable ranges of acoustical criteria; and 2) the relationship between the aural environment and personal productivity, retention, and performance. The compiled data indicates assigning 20 to 37% of a room’s surface area with the aerated faceted concrete panels (or suspended in the space) to yield a 40 to 55% reduction in 500 to 2000 Hz reverberation times (speech frequencies).
Viaduct V3, Tamoios Highway (Brazil)
Presented By: Vanessa Lima Capilla
Affiliation: ENGECORPS ENGENHARIA SA
Description: This presentation refers to Viaduct V3, which connects the Paraiba River Valley to the northern coast of São Paulo, in Brazil. It is located amidst the ridge and has a curve radius of approximately 500 m. The cross section was conceived as a prestressed single-cell box girder, which was built using the cantilever method. The lateral piers receive not only the main viaduct, but also access lanes with 30 m spans, adding up to a total length of 310 m that overcomes the existing valley. The construction used a 20 tf capacity cable crane instead of a service byway, reducing the environmental impact.
Adaptive Reuse, 225 W. Madison
Presented By: Kenneth Horton
Affiliation: DLR Group
Description: Instead of demolishing the decommissioned Madison Street Jail in the heart of downtown Phoenix, the owner and design team at DLR Group worked to transform the closed, fortified structured into an open and inviting Class A office. The existing structure was reanalyzed and reinforced where required with carbon fiber, saving 65 million lb of concrete and 2.1 million lb of steel being completely trashed. With new amenities, such as a rooftop garden that was once an inmate recreation yard, the renovation is a testament to the successes in rehabilitation and sustainability.
Presented By: Douglas Couto
Affiliation: Phd Engenharia Ltd.
Description: This presentation shows the concept process of the iconic Leopoldo 1201 project, with its architectural high-performance concrete (HPC) façades with wood textures and biophilic lines, HPC columns with fc' = 13,500 psi (cylinder 90 MPa) and modulus of elasticity of 7,000,000 psi (50 GPa) at 91 days, and only 6.75 kg portland cement/MPa, showing challenges to build a non-conventional structure and the sustainability of use of HPC.
Concrete Solidifies an Artistic Vision/Arkansas Museum of Fine Arts
Presented By: Kristen Erickson
Affiliation: Pepper Construction
Description: The Arkansas Museum of Fine Arts is undergoing a $142 million renovation in Little Rock, AR. The 133,000 ft2 space blends elements of the original 1937 Art Deco structure, which will serve as an entrance to the museum, with stunning contemporary design. Its signature roof, a flowing, folded-plate concrete structure, blossoms to the north and south. Below the roof is a custom curtainwall system that provides breathtaking views of the surrounding park. The design uses complex concrete building elements as its main internal and external design features. In addition to the roof structure, the primary elements are a unique slab on grade and sloping exposed columns. - The polished slab-on grade features a deep grind to expose a unique aggregate mixture that provides a consistent flooring material throughout the main areas of the museum. - Rising out of the slab-on grade, architecturally exposed concrete columns have unique "V" and "Y" shapes visible from inside and outside the structure. The profiles start wide at the base and gradually taper down until they merge with the roof beams. - The 28,000 ft2 folded-concrete roof structure curves between the existing museum structures and blossoms out into the surrounding green space. Three-dimensional (3-D) modeling was used to generate more than 1200 wood frames that varied in pitch, width, and curve along each section and form the bottom surface of the folded plate. Join us to learn more about how this complex project was planned and is being brought to life for a planned reopening in the fall of 2022.
The Austonian / Exposed Slab Edge Repairs
Presented By: Michael Ahern
Affiliation: Pivot Engineers
Description: After only 6 years of service, a 6 ft long narrow piece of concrete spalled off an exposed slab edge of a 680 ft tall high-rise in Texas, and fell 160 ft to the podium below. The spall was attributed to premature corrosion at the drip edge. The building featured approximately 9200 ft of exposed slab edge over its height. Given the potential risk to safety and property of additional concrete spalls, the Owner requested forensic investigations, which 1) identified other areas with signs of similar distress; and 2) determined the underlying problem of low reinforcement cover at the drip edge was pervasive. In response, repair options were developed to address the problem and restore intended durability. Given the building height, difficult exterior-only access, downtown environment, and post-tensioning anchors along the slab edge, the repair design and construction both had unique challenges to consider and overcome. The engineer and contractor worked collaboratively on nearly all aspects of the project to develop effective and constructible repairs for the slab edges. The repairs consisted of structural replacement of the slab edges with glass fiber-reinforced polymer (GFRP) reinforcement and new waterproof coating, which were completed in summer 2019 after approximately 16 months of construction.
The Cave That Travelled
Presented By: Jayant Dharap
Affiliation: Forethought Design Consultants
Description: Using an unyielding and hard material like concrete to create a free flowing and plastic form was the primary challenge. Additionally creating the form 600 miles away from site was an even larger logistic challenge.
Both the aforementioned challenges were resolved by deploying ferrocement technique, the skeleton of which was created in Pune, and then transported to site, reassembled, and then concreted in place.
The presentation will trace this entire journey of "The Cave That Travelled" from the genesis of the idea through the different stages of execution up to its completion.
Lord Shiva statue at Nathdwara, Rajasthan, India
Presented By: Abhay Gupta
Affiliation: Skeleton Consultants Pvt Ltd, Noida
Description: This is a detailed presentation about a unique, gigantic statue, 351 ft high in sitting posture—the fourth tallest in the world. The statue is made of an internal steel structural skeleton and foundations, and an external skin of cast-in-place RCC. The statue’s design life is 250+ years using a specially designed concrete mixture. Wind tunnel testing was done at WindTech, Sydney, Australia, on a 1:200 scaled model. The construction was completed in a 5-year period. The entire 20,000 m2 surface area skin is jointless. Foundations have been anchored in rock using 8 m long anchors. The external skin has been coated with a 50 micron copper metallic spray.
Intel Multi Level Car Park
Presented By: D.N. Vishwanath
Affiliation: Shapoorji Pallonji and Company Private Limited
Description: We will be presenting a project-specific PowerPoint presentation, which include the highlights about the project. A time-lapse video of approximately 4 minutes’ duration is also included, to demonstrate how actually it was realized at project site.
Deichman Bjørvika, Oslo Public Library
Presented By: Marius Mowe
Affiliation: Atelier Oslo Architects
Description: Deichman Bjørvika, the new main library of Oslo, Norway, opened in 2020. The building is characterized by an open and inclusive interior, made possible by the use of a concrete structure. The concrete structure is also an important contribution in achieving the high environmental ambitions the municipality of Oslo had for the building.