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Home > Education > Free Web Sessions
Browse from hundreds of recorded presentations from ACI Conventions and other concrete industry events.
Crumbling Concrete Foundations Due to Pyrrhotite Bearing Aggregates in CT
by Kay Wille, University of Connecticut
Deleterious Oxidation Reaction of Iron Sulfides in Concrete Aggregate (ACI Spring 2022, Orlando, FL)According to the Connecticut Department of Housing, upwards of 35,000 homes in eastern Connecticut face the potential for a failed concrete foundation. Visual inspections revealed map cracking, mineral deposition and discoloring as typical signs for a failed concrete foundation, which were poured from the same concrete supplier using iron-sulfide-bearing aggregates in their mix design. This presentation provides information about the deterioration mechanisms and shares information about the ongoing research at the University of Connecticut..
December 5 - 11
The Merdeka 118 Tower in Kuala Lumpur (KL118)
by Stephen Herald, Aggregate Industries
International Session – Special Buildings in Shape and Construction Method (ACI Spring 2022, Orlando, FL)The Merdeka PNB 118 tower in Kuala Lumpur, Malaysia will be completed this year. This iconic new landmark in the Kuala Lumpur skyline has been in the making since 2015, when Lafarge Malaysia started its partnership with general contractor Samsung C&T. Stephen Herald, RMX Technical Services Manager at LafargeHolcim US West Central Region, will discuss the main concrete design challenges that were solved during the preparation and implementation of this exceptional project. Stephen will focus on the high performance mixes that helped optimize the design and construction of the tower. Being able to design and test for high strength and rigidity was key to success. Moreover, a new approach to pumpability design and prediction was created, using a tribometer and simulation tool to ensure the feasibility of pumping concrete up to 1,700-feet heights.
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