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Home > Publications > International Concrete Abstracts Portal
Showing 1-5 of 80 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
CI4609TechSpotlightAquajet
September 1, 2024
Concrete International
46
Issue:
9
While it might seem that hydrodemolition is only appropriate for big projects, it can also be an economical choice for compact applications, such as the renovation of a residential garage floor. The floor had heavy damage that required recasting with new concrete. The floor was diamond ground, so the hydrodemolition method was well-suited to create a rough, consistent bonding surface for the new concrete.
CI4508Bentivegna
August 1, 2023
Anthony F. Bentivegna, April Snyder, and Stephen M. Stacey
45
8
Concrete aggregates produced in two regions in North America have been identified as the cause of deterioration to tens of thousands of residential and light commercial concrete foundations. The article provides an overview of the deterioration mechanism, manifestations of the reaction in North America, current state of knowledge for identification and quantification, and current and proposed legislation.
CI4410Kalousdian
October 1, 2022
by Aram Kalousdian
44
10
An assembly system of vertical construction is used for the construction of a 16-story mixed-use residential development in Detroit’s Greektown district. The technology allows workers to assemble floor plates; façade elements; and selected mechanical, electrical, and plumbing systems at ground level. One-by one, the assemblies are raised and locked into their final positions through connections with the building’s two reinforced concrete cores.
SP-355_09
July 1, 2022
Mario Collepardi, Silvia Collepardi, Roberto Troli
355
Radon is a radioactive invisible, odorless, tasteless gas that seeps up through the ground and diffuses into the air. Radon gas naturally moves into the permeable soil and gravel bed surrounding foundations and then, inside the buildings through openings, cracks, and pores of the concrete. The type of constructions more exposed to the radon risk emanated from the ground are industrial buildings, supermarkets, shops, restaurants, and all the residential buildings where people work or live on the ground floors. In the present paper, the rehabilitation of building polluted by radon gas has been studied. Two techniques can be adopted to reduce the radon concentration in the building environments: A) change of the environmental air opening doors and windows of the building; B) if the change of air is incompatible with the industrial activity carried out in the building the radon entry can be blocked using the application on the existing concrete surface of a specific cap sheet membrane; in particular a bitumen-based radon gas barrier has been examined already studied and acting as an effective radon gas barrier. In the end, the radon barrier can be covered by a concrete layer. According to the Italian Legislative Decree No. 101/2020 presently the radioactivity caused by the radon gas in the houses and industrial buildings must be lower than 300 Bq/m3, whereas for the building erected after December 31, 2024, should be lower than 200 Bq/m3.
10.14359/51736015
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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.