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Home > Publications > International Concrete Abstracts Portal
Showing 1-5 of 969 Abstracts search results
Document:
SP364_10
Date:
December 1, 2024
Author(s):
Hyeon-Jong Hwang, Jong-Min Lee, Han-Se Moon, and Hong-Gun Park
Publication:
Symposium Papers
Volume:
364
Abstract:
During construction, the load on the slabs can be up to 2 to 3 times their self-weight, which can damage serviceability and structural safety of the slabs with early-age concrete. In the present study, an existing model to predict the load on slabs during construction was modified to account for the use of regular supports and temporary supports in the shoring system, considering construction step where temporary supports are removed. Additionally, the effective supporting area of the shore was introduced to account for the uneven distribution of shores, thereby improving the prediction of construction loads on slabs. To verify the accuracy of the modified model, loads on shores were measured at a wall-type residential building under construction in South Korea. For 2 stories, the loads on shores were measured and the measurement lasted for 45 days. The comparison between predicted and measured slab construction loads showed that the predicted construction load agreed with the measured construction load.
DOI:
10.14359/51745462
CI4612PRO
Phil Diekemper
Concrete International
46
Issue:
12
Currently, about 50% of all ready mixed concrete in the United States is produced using Type IL cement. However, in comparison to mixtures with Type I/II cement, there is a lack of information concerning constructability with such mixtures. To create a knowledge base, with a grant from the ACI Foundation, the American Society of Concrete Contractors and Giatec Scientific Inc. are collecting design characteristics of well-performing mixtures with Type IL cement for interior, non-air-entrained concrete floor slabs.
CI4610ConcreteQA
October 1, 2024
10
The general purpose of reinforcing bars in slabs-on-ground is to control crack widths at the top surface of a slab. As the amount of reinforcement increases across the joint, the probability of out-of-joint cracking increases, as tighter cracks may occur at closer spacing than the joints. The Q&A provides some guidance on the amount of reinforcement crossing the joint and its role.
CI4610Thiel
Charles C. Thiel Jr. and K. Dirk Bondy
All new parking structures in California are required to be wired for photovoltaic installations, resulting in conduit requirements that are excessive for some slabs. These conditions can seriously impair the structural load path and create an unanticipated structural hazard. The California State University (CSU) system’s Seismic Review Board developed interim conduit placement requirements for CSU projects.
CI4606Pujol
June 3, 2024
Santiago Pujol, Carlos E. Ospina, and Charles Kerby
6
The article discusses field evidence, available test data, and a simple mechanical construct all suggesting that 1× √f’ c can be used as a pragmatic lower bound to shear strength of reinforced concrete beams and one-way slabs without transverse reinforcement, at least within certain ranges.
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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.