Free Online Education Presentations

Browse from hundreds of recorded presentations from ACI Conventions and other concrete industry events.

This Week's Featured Presentation

Presentation details

The Concrete Industry in the Era of Artificial Intelligence (ACI Spring 2021 Convention, Virtual Sessions) With IoT sensors gaining widespread adoption in recent years for monitoring in-situ concrete properties, the volume of data generated using these sensors is growing at a significant rate. These sensors are typically used for several purposes among which temperature, humidity, and strength monitoring (using the maturity method) are currently the most common. This data is typically collected at centralized cloud-based databases where they can be accessed by end-users as well as algorithm developers. This work presents on how data from these IoT sensors has been used by the authors to train machine learning algorithms to perform several tasks including but not limited to: detecting anomalies, detecting events in the service-life of the sensor (e.g. concrete pouring,) suggesting mixture alterations to optimize performance and predicting future performance. These capabilities are currently being used by concrete practitioners on daily basis. This is done using data collected from tens of thousands of sensors, used in over 7000 projects representing geographical regions of over 50 countries and representing several thousand unique concrete mixtures. This, to the authors’ knowledge, is the largest dataset available for training such algorithms. Challenges in maintaining this ever-growing dataset as well as opportunities with the growing capabilities of these algorithms are presented.

Upcoming Presentation

September 27 - October 3

Longfellow Tower – 16+ Years Later
by Timothy Gillespie, Sika Corporation

Presentation details

Integration of Innovative Techniques and Approaches for Optimum Concrete Structure Rehabilitation (ACI Spring 2021 Convention, Virtual Sessions) The prestigious Longfellow complex is located in the heart of downtown Boston on the Charles River. This presentation focuses on two 38 story apartment buildings which were constructed between 1970 and 1972. Inspections conducted in 1997 identified numerous areas of spalls due to corrosion of the steel reinforcement. More recently, sealant joints at the sliding glass doors, ac units and windows were failing and allowing water to leak into the apartments. In 2001, inspecting engineers carried out a comprehensive investigation to determine the extent of damage and the root cause. Among other things, they determined spalling had increased by 25% since 1996. Exposed column faces, balcony edges and floor slab edges had the least cover and most spalls. There was chloride contamination, carbonation and low cover throughout. Wherever the cover was less than 2” there was high levels of active corrosion. The goal of the Owner and the Engineer was to repair the spalled concrete and leaking joints and to provide long-term protection to the building. A repair program was completed in 2004- 2005 with the goals to repair the spalls and leaking joints and protect the building by mitigating active corrosion. A preview was completed to confirm the design met the objectives. Finally, areas of the building were monitored to confirm effectiveness of the repair and protection program. All of this resulted in a repair program that will no doubt provide long-term durability for this Owner. In 2015, 10 years after the repair program was implemented, the 2 buildings were in pristine condition. In 2019 the repairs implemented in 2005 continue to perform. This presentation will review the history of the 2 buildings, the repairs implemented in 2005 and an update on their condition which includes remote corrosion rate monitoring.

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