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Home > Publications > International Concrete Abstracts Portal
Showing 1-5 of 10 Abstracts search results
Document:
CI4305Symposium
Date:
May 1, 2021
Publication:
Concrete International
Volume:
43
Issue:
5
Abstract:
On March 25, 2021, Juan Pablo Covarrubias Sr. was honored for his contributions to concrete pavement design with an online symposium. Twenty speakers summarized the history of concrete pavement design and research in Chile, the United States, and other countries, with a major emphasis on the role Covarrubias has had in inspiring his friends and colleagues to think differently. His work has led to thin concrete pavements, with superior durability and reduced economic and environmental costs relative to more conventional pavements.
SP-339_12
March 1, 2020
Author(s):
Burkhart Trost, Harald Schuler, and Bozidar Stojadinovic
Symposium Papers
339
Sliding failure of reinforced concrete shear walls was observed after the Chilean earthquakes in 1985 and 2010, during shaking table tests, and in many quasi-static cyclic shear walls tests. Sliding may occur along cold joints or flexural cracks that remain open due to permanent deformations induced during cyclic loading. If it occurs, sliding can significantly reduce the horizontal force resistance and change the deformation mechanism of reinforced concrete shear walls, and thereby markedly affect the seismic performance of shear wall buildings. This study provides the interaction diagrams intended to help reinforced concrete shear wall designers exclude the sliding failure mode. Regions where sliding, shear, and flexural failure modes are expected are delineated according to the shear wall shear span to length ratio, the axial force, the horizontal and vertical reinforcement ratios, and the concrete strength. These interaction diagrams are derived using a cyclic reinforced concrete wall response model that considers flexure, shear and sliding load-deformation relationships and the interaction between them. The inter-action diagram is used to develop design recommendations on how to avoid the sliding failure of reinforced concrete shear walls under earthquake loading.
DOI:
10.14359/51724703
CI3106Masana
June 1, 2009
Cristian Masana
31
6
Clearly defined tolerance specifications can help prevent disagreements about deviations between as-built dimensions and those indicated on project drawings. The Instituto del Cemento y del Hormigón de Chile (ICH) Committee on Technical Specifications for Contracts has developed ET 004-06, "Dimensional Tolerances in Reinforced Concrete Elements," based on data from several different sources. The specification provides a consistent set of tolerances for six surface finish grades and also establishes appropriate repair procedures for cases of noncompliance.
CI3006Masana
June 1, 2008
30
Realizing the importance of efficient use of formwork, the Instituto del Cemento y del Hormigón de Chile (ICH) Committee on Technical Specifications for Contracts developed specification ET 003-06, “Formwork Removal for Reinforced Concrete Vertical Elements.” The specification applies to vertical surfaces of reinforced concrete that are not required for structural support and provides simple, conservative requirements for the timing of formwork removal. It also provides requirements for contractors to follow when establishing their own stripping plan to allow more efficient construction.
CI3002Masana
February 1, 2008
2
If the dumping height is too large for the construction procedures, mixture, and reinforcement congestion, the most evident defects are honeycombs. To provide a tool to define an acceptable dumping height that will assure that the amount of honeycombing is within a permissible limit, the Concrete Casting Committee of the Instituto del Cemento y del Hormigón de Chile (ICH) developed Technical Specification ET 002-05, “Dumping Height of Concrete when Casting Vertical Elements.” This performance specification allows greater dumping heights that can lead to greater productivity without compromising the quality of the product.
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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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