Ward R. Malisch Concrete Construction Symposium (Part 1)-Self-Consolidating and Hydration Stabilizer Concrete Revolutionizes NYC with Modern Concrete Technology (PDF)

Self-Consolidating and Hydration Stabilizer Concrete Revolutionizes NYC with Modern Concrete Technology (PDF)

Pdf Summary

The document provides an overview of innovations in concrete technology, focusing on the use of Self-Consolidating Concrete (SCC) and hydration stabilizers in New York City's skyscraper construction projects. Notable developments, such as 220 Central Park South and the Hudson Yards Complex, highlight how SCC helps overcome challenges associated with dense urban environments, tight construction sites, and logistical constraints.<br /><br />SCC is described as a highly flowable, stable concrete that fills formwork without the need for vibration, significantly reducing segregation and blocking through congested areas. Benefits include ease of placement and enhanced flow through obstructions like dense rebar configurations. This technology has been implemented in high-profile projects, including the 920-foot 220 Central Park South and the 10 Hudson Yards Tower.<br /><br />The document also emphasizes the importance of hydration stabilizers. These admixtures suspend the hydration process to retain slump and extend workability, crucial for complex projects with time-sensitive logistics. They are particularly effective in hot weather, for long hauls, and demand streamlined on-site operations.<br /><br />Specific mix designs are detailed for projects, such as 220 Central Park South with a 14,000 psi mix and the Hudson Yards with SCC achieving up to 15,150 psi. The document underlines that robust concrete mixes are vital to meet the high structural demands of skyscraper construction while navigating New York City's construction challenges, including traffic congestion and site constraints.<br /><br />The inclusion of extended working times allowed for advanced planning and execution, with the approval of additional hydration stabilizing admixtures providing up to three hours from mixing to discharge for some projects. These innovations ensure compliance with engineering standards such as modulus of elasticity, compressive strength, and water-cement ratios.<br /><br />In summary, advances in SCC and hydration stabilizing technologies represent a transformative approach to concrete construction, facilitating efficient, high-quality development in urban skyscrapers.

Keywords

Self-Consolidating Concrete

hydration stabilizers

New York City skyscrapers

220 Central Park South

Hudson Yards Complex

high flowability

dense rebar configurations

structural demands

construction logistics

urban construction