Master Builders Solutions

Soaring to a height of 1,776 feet (540-meters), the 2.6-million-squarefoot (242,000-square-meter) skyscraper known as One World Trade Center in the lower Manhattan district of New York City is a marvel of design and engineering. Construction of the building, previously called the Freedom Tower, began in April 2006 and at the time was the tallest building in the United States.The Challenge Sustainable design was a central theme to One World Trade Center’s development, with the Port Authority of New York/ New Jersey imposing a strict requirement for the replacement of Portland cement with recycled materials. In addition, extremely high performance concrete was necessary to meet the compressive strength requirements of the steel and concrete structural columns, which ranged from 14,000 psi (97 MPa) to 12,000 psi (83 MPa) for the lower 40 floors and 10,000 psi (69 MPa) to 8,600 psi (59 MPa) for the upper floors. The 12,000 psi (83 MPa) concrete phase of the project was the most challenging, with the engineers, owners and contractors all having their own requirements and specifications.The ResultsThrough Master Builders Solutions‘ Green Sense Concrete mixture optimization service, Eastern Concrete Materials was able to proportion an EF Technology® concrete mixture with 71% cement replacement. The mixture replaced Portland cement with the recycled materials, non-cementitious fillers and specialized admixtures to exceed all the performance targets specified by the One World Trade Center project stakeholders. This EF Technology mixture was used for the 38,000 yd3 (29,000 m3) of concrete needed for the columns through the first 40 floors. To quantify the environmental impact of sustainable concrete for the structure, an Eco-Efficiency Analysis was conducted, using a methodology validated by NSF International, to compare the specialized EF Technology mixture to a reference mixture. Some practical equivalents for these savings are: Water savings equal to 1,177,329 half-liter bottles of waterReduced carbon footprint equal to 1,835,494 gallons of gasolineFossil fuel savings equal to 29,872 barrels of oil

OverviewSet in the heart of downtown Toronto, the Ontario Court of Justice is the largest courthouse in Ontario and a benchmark for contemporary institutional construction. Completed in 2024, the project brings together 63 courtrooms and 10 conference settlement rooms in a LEED® Gold certified facility that reflects modern civic values—transparency, accessibility, and sustainability.Master Builders Solutions Canada Inc. played a key role in ensuring the structural concrete met the performance demands of this high-profile project.The ChallengeDelivering nearly 48,000 m³ of ready-mixed concrete in a downtown location posed numerous technical challenges. The structural design demanded high compressive strength, consistent workability, and durability to support complex load paths, security zones, and a tall atrium enclosed by a 20-metre glass façade.The project team required concrete solutions that would:Maintain workability over long pumping distances and vertical placements,Ensure strength development for critical structural zones (such as core walls and transfer slabs),Limit thermal cracking during curing in massive pours,Integrate seamlessly with staged slipform and rebar installation schedules.These demands were intensified by the need to meet LEED® Gold sustainability targets, tight construction timelines, and high public visibility.The ResultsMaster Builders Solutions Canada Inc. partnered closely with St Marys CBM to optimize concrete performance across all phases of construction. A suite of high-performance admixtures—including water reducers, retarders, and strength-enhancing additives—was deployed to address the project’s structural and logistical complexities.Key contributions included:Enhanced workability retention for long-distance pumping and complex placements, reducing placement time and labour.Improved early- and long-term strength development, enabling faster formwork cycling and reliable performance in high-load areas.Mitigated thermal buildup in mass pours to control cracking and ensure durability over the structure’s lifecycle.Admixture compatibility with supplementary cementitious materials (SCMs), aligning with the project’s environmental goals.By tailoring admixture solutions to the precise performance needs of each mix design, Master Builders Solutions supported consistent quality and efficiency throughout the build.The Ontario Court of Justice now stands not only as a civic institution but also as a demonstration of what is possible when modern structural design and advanced concrete technology are brought together. The project exemplifies how Master Builders Solutions helps construction teams deliver on performance, sustainability, and long-term value.