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Home > Publications > International Concrete Abstracts Portal
Showing 1-3 of 3 Abstracts search results
Document:
18-070
Date:
July 1, 2019
Author(s):
Krešimir Nincevic, Lisa-Marie Czernuschka, Marco Marcon, and Roman Wan-Wendner
Publication:
Structural Journal
Volume:
116
Issue:
4
Abstract:
A large experimental campaign was completed with the objective to determine how concrete composition and age affect the tensile load capacity of mechanical anchors with concrete cone breakout, tested in three different normal-strength concretes. Structural tests for cast-in headed stud anchors were performed at 28 and 70 days and compared to results obtained on post-installed undercut anchors. The concretes were fully characterized in terms of Young’s modulus, compressive and tensile strength, and fracture energy. The evolution of the concrete compressive strength is consistent with the aging function proposed in codes. Because the history of environmental conditions influences the development of material properties with age, three different curing conditions are considered for the material characterization, including indoor moist-curing and outdoor storage with the slabs. The structural data clearly show a pronounced aging effect, even after normalization by compressive strength, regardless of the curing protocol considered.
DOI:
10.14359/51715575
JL82-71
November 1, 1985
Muzaffer Yener and Wai F. Chen
Journal Proceedings
82
6
The differential influence of six potentially significant parameters aggregate size, aggregate shape, water-cement ratio, age of concrete, curing conditions, and cement types - were examined experimentally to develop empirical relationships correlating breakoff strength and conventional flexural strength of concrete. Conventional cylinders were also tested to determine possible correlation between the breakoff and compressive strengths of concrete. Evaluation of results of 122 breakoff, 140 beam, and 110 cylinder tests indicates that water-cement ratio, age of concrete, curing conditions, and cement type have a significant differential effect on breakoff and beam tests and that all six of the parameters display a differential effect on breakoff and cylinder tests. Because correlation of breakoff strength and compressive strength proved to be highly impractical, linear regression analyses were executed only to correlate beam and breakoff strengths as a function of water-cement ratio. The statistical relationships developed between beam strength and breakoff strength as measured in the present investigation are valid only for 7-day strength, Type I cement concrete cured under moist conditions. Modification of the breakoff testing procedure may alleviate the dependence of the relationship between the two strengths on these parameters.
10.14359/10389
JL07-18
December 1, 1911
John T. Simpson
7
12
On the 4th day of March, 1908, there was flashed over the telegraph wires to every newspaper throughtout the length and breadh of this land, the news of a great disaster. In a schoolhouse at Collingwood, Ohio, a suburb of Cleveland, one hundred and sixty-five children lost their lives through the breaking out of a fire during school hours.
10.14359/16220
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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.
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