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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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Home > Events > Conventions > Current Convention > Sessions and Events
C = Duke Energy Convention Center; H = Hyatt Regency Cincinnati
Concrete Constructability: River of Knowledge
Wed, October 23, 2019 8:30 AM - 10:30 AM, C-Junior Ballroom C
Present new research, specification changes, and knowledge gained thru experience as it applies to constructing in concrete. Educate members of our industry so they can utilize knowledge to produce a better concrete product. Learning Objectives: (1) Recognize new specification requirements for surface finishes in tilt-wall construction;(2) Summarize new research related to formwork curing of the concrete surfaces;(3) Describe new research comparing the use of laser scanning, drones and traditional methods to measure concrete surfaces for quality;(4) Explain how we should be designing our ADA compliant sidewalks with allowable tolerances in mind.
Tunnels in Paradise
Presented By: Mark Hirschi
Affiliation: Baldridge & Associates Structural Engineering
Description: As contractors and developers in Hawaii seek opportunities to squeeze additional productivity out of the construction schedule, many have begun to turn to tunnel forms in search of an edge over the competition. This specialty forming system allows contractors to cast walls and slabs in the same sequence, eliminating a pour and allowing contractors to cycle formwork more quickly. Additionally, with their closely spaced concrete walls tunnel forms offer further time savings as less interior build-out remains to be constructed after the concrete is poured and significantly less reshoring is typically required. However, tunnel forms are not without their challenges. When done correctly, tunnel form construction can result in significant time and cost savings, as exemplified by several recent projects completed in Hawaii.
Constructability: Determining the Effectiveness of Curing Concrete
Presented By: Tyler Ley
Affiliation: Oklahoma State University
Description: Contractors are interested in removing the formwork from concrete walls as soon as 12 hours in order to reuse these forms. While these walls may have sufficient strength, there is concern about the long-term durability of removing the forms at early ages. Curing is known to maintain the concrete moisture and promote hydration towards a denser microstructure and improved durability. This research aims to investigate the impact of different curing methods after form removal at different times on both drying rate and ion penetration into concrete. Rapid drying on young concrete can cause cracking if the element is restrained, like a wall, which exacerbates ions and moisture penetrations leading to corrosion and other durability issues. This study provides quantitative values for mass loss and chloride concentration using Micro X-ray Fluorescence which gives insights into the service life of their concrete and help choose more reliable curing methods, curing duration, and form removal times.
Providing Expectations of Tilt-wall Surfaces
Presented By: Anthony DeCarlo
Affiliation: TWC Concrete Services LLC
Description: Presenting typical issues of tilt-up wall panel finish expectations and recent developments in ACI 301 surface finish specifications to help contractors understand and meet specific panel finish requirements that architects and owners can realistically expect.
New Admixture Technology Provides Workability Solution for Tilt Wall Panels
Presented By: Ryan Scott
Affiliation: GCP Applied Technologies
Description: A new admixture technology allows for slump flows up to 25” without changing the standard concrete mixture proportions. A recent project placed in the Cincinnati area allowed the Contractor to place highly flowable concrete in Architectural tilt wall panels without decreasing the maximum course aggregate size or increasing the cementitious content. Standard concrete mixture proportions were used, and a new admixture technology was utilized to achieve the desired slump flow.
How Good is Laser Scanning?
Presented By: William Paul
Affiliation: BKF Engineers, Inc.
Description: 3D Laser Scanning promises to revolutionize the way existing conditions are measured. Utilizing LiDAR technology, scanners take up to 2 million measurements per second! Owners, inspectors, and construction managers are using laser scanning to evaluate the quality of your work. Is this technology as accurate as the manufacturers claim? Is it really accurate enough to evaluate tolerances of installed work? This talk will discuss a recent study, hosted by ASCC, where 3D laser scanning technology was put to the test. Results of the test will be shared, along with a comparison of real work laser scanning accuracy.
Accounting for Tolerances within ADA Design Criteria
Presented By: Peter Ruttura
Affiliation: Ruttura & Sons Construction
Description: Design professionals designing ADA compliant sidewalks are sometimes forced into designing at the maximum allowable values. The maximum ADA values do not take into account the allowable tolerances of ACI 117 Specifications for Tolerances for Concrete Construction and Materials. A Contractor and the Design Professional are in a lose-lose situation.