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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Showing 1-2 of 2 Abstracts search results
Document:
20-459
Date:
November 1, 2021
Author(s):
Gregor Fischer and Ieva Paegle
Publication:
Materials Journal
Volume:
118
Issue:
6
Abstract:
Digital fabrication and automated manufacturing technologies have been explored for civil engineering applications in the recent past and have rapidly gained momentum. Research and industrial development activities have been primarily focused on three-dimensional (3D) printing of concrete using the basic principle of extrusion along a predefined, automatically guided path. While the automated placement and shaping of concrete has advanced and has been refined significantly, the installation of reinforcement in the concrete is still largely done using traditional methods by manual placement of conventional steel reinforcing bar in a cavity between 3D-printed walls of formwork, which is subsequently filled by conventional cast-in-place concrete or grout. The concept for the construction of a structure in an entirely automated, digitally controlled process using alternative methods of structural reinforcement is currently still to be developed. Structural reinforcement is a key requirement in any efficient and economical concrete structure, and it is a challenge to invent a process for placing this reinforcement using an automated process in line with the printing process of concrete.
DOI:
10.14359/51733127
16-098
May 1, 2018
Jacob D. Henschen, Daniel I. Castaneda, and David A. Lange
115
3
Industry guidelines recommend that formwork be designed to withstand full hydrostatic pressures when using self-consolidating concrete (SCC) and highly flowable concrete. However, full hydrostatic pressures are seldom observed during SCC pours, meaning that it is possible to safely relax formwork design specifications. Numerous researchers have developed models that incorporate lab-tested material values to predict formwork pressure, but these models are affected by changing concrete mixture design, air temperature, humidity, and other factors that cannot be accounted for quickly. A simple field test method and model is presented in this study that predicts the formwork pressure using a calibrated behavior, which we call a “pressure decay signature.” The simple formwork pressure model is shown to agree well with experimentally measured values during the construction of two tall-walls, suggesting that this method and model can contribute to increased cost efficiency of SCC construction while maintaining safe practices.
10.14359/51702183
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