ABOUT THE 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.

International Concrete Abstracts Portal

Showing 1-5 of 276 Abstracts search results

Document: 

SP-360_32

Date: 

March 1, 2024

Author(s):

Chaoran Liu, Ligang Qi, Ying Zhou, Guowen Xu, Yan Yang, Zhiheng Li, and Yiqiu Lu

Publication:

Symposium Papers

Volume:

360

Abstract:

Fiber-reinforced polymer-reinforced concrete (FRP-RC) structures have won researchers’ attention for decades as a considerable substitute due to their superb mechanical and non-mechanical properties. Despite the promising potential of concrete structures with glass FRP and basalt FRP that were shown by previous research, there are few specifications for the seismic design of FRP-RC structures to date due to limited research data on their seismic behavior. This paper focuses on the seismic performance of concrete columns with carbon fiber-reinforced polymer (CFRP) reinforcement by finite element modeling. The effect of longitudinal reinforcement type and ratio, stirrup spacing, concrete strength and axial load ratio are included in the parametric analysis in VecTor2. Properly designed CFRP-RC columns with good confinement generally reach high load-carrying capacity and deformation level, while high axial load could induce relatively severe damage. To verify these conclusions, seven full-scale columns are under construction and will be tested under combined lateral reversed cyclic loading and constant axial loading.

DOI:

10.14359/51740644


Document: 

SP-360_14

Date: 

March 1, 2024

Author(s):

Camilo Vega, Abdeldjelil Belarbi, and Antonio Nanni

Publication:

Symposium Papers

Volume:

360

Abstract:

Most of the research related to interface shear transfer in concrete elements has utilized steel bars as reinforcement, while GFRP reinforcement has received little attention experimentally and analytically. For this reason, only a few design specifications include provisions for the calculation of the interface shear transfer when using GFRP. In this project, an experimental campaign is being conducted to determine the contribution of GFRP bars to the mechanism of shear transfer by using push-off specimens. The literature review and the test methodology are reported in this paper. The obtained results indicate that the use of GFRP reinforcement significantly enhances the interface shear strength, resulting in a capacity that exceeds those of the specimens without reinforcement. When the GFRP-reinforced specimen reaches the first crack at a load similar to that of the unreinforced specimens, it continues carrying load until it reaches a peak, thus indicating that the reinforcement is providing both dowel action and clamping force prior the shear failure. Additionally, once the peak strength is reached, the use of GFRP reinforcement allows the specimen to deform in a pseudo-ductile fashion thus preventing sudden failure.

DOI:

10.14359/51740626


Document: 

SP359_06

Date: 

November 1, 2023

Author(s):

Kacie C. D’Alessandro, Matthew K. Swenty, Eric S. Musselman

Publication:

Symposium Papers

Volume:

359

Abstract:

This paper presents pedagogical techniques used to teach detailing of reinforced concrete structures. Detailing includes the ACI 318 code specifications for reinforcement placement and layout in a structural component. Students sometimes view this topic as a set of rules and standards; however, students must also understand the reasons these specifications exist. Therefore, the authors include a variety of methods to address both how to apply detailing and why detailing matters. These methods allow students to make critical assessments and experience higher-order learning. The authors utilize a variety of active and student-centered learning methods to teach the topics of detailing. The specific approaches discussed within this paper include skeleton-style notes, case studies, field work, experiential learning opportunities, projects, and the inverted classroom. This paper presents the pedagogical significance of each method, provides examples of implementing each method, and includes lessons learned by the authors based on their own implementation of these methods in the classroom.

DOI:

10.14359/51740292


Document: 

SP-355_18

Date: 

July 1, 2022

Author(s):

Renee T. Rios, Francesca Lolli, Katelynn Schoenrock, Kimberly E. Kurtis

Publication:

Symposium Papers

Volume:

355

Abstract:

Performance-based specifications (PBS) may increase concrete quality and sustainability by facilitating innovations in material selection and proportioning. This is particularly relevant now with increased interest in a broader set of minimally processed minerals for use as supplementary cementitious materials (SCMs) or fillers; these are often industrial and agricultural byproducts and with limited performance history in concrete. This study compares traditional largely prescriptive concrete design, following practices currently allowed by the Georgia Department of Transportation, with three new concrete designs which do not comply with current specifications but offer increased sustainability. Three metrics are assessed for each mixture: the associated cradle-to-gate CO2 emissions, a metric that incorporates the environmental burden of concrete, compressive strength at 28 days, and surface resistivity measurements taken weekly from 28 to 56 days. A framework is proposed to statistically analyze compressive strength data to pre-qualify mix designs, which can be broadly applied to reduce time-consuming iterative testing and to help meet sustainable development goals. The aim is to foster innovation in material use and mixture design towards an increased durability and performance, while reducing environmental impact and minimizing risk.

DOI:

10.14359/51736027


Document: 

SP-353_05

Date: 

July 1, 2022

Author(s):

Dario Coronelli, Aurelio Muttoni, Radu Pascu, Antonio Ramos

Publication:

Symposium Papers

Volume:

353

Abstract:

Current European seismic regulations do not cover the seismic design of flat plate structures (denominated flat slabs in Europe and in the following) The results of full scale testing on a two-story flat-slab frame are intended to contribute to future code developments are reported in the paper. The design of the specimen complied to the general specifications in the European seismic code for secondary elements i.e. non-seismic resistant. An extension of the approach proposed by ACI318 was used to predict the ultimate drift capacity of the connections. A first testing phase subjected the structure to seismic actions simulated by the pseudo-dynamic technique, including numerical models of shear walls. In a second phase, the frame was tested for cyclic loading up to 2.5% global drift ratio firstly, followed by the addition of strengthening, and a second cyclic test was done up to 6% global drift ratio. The results are compared to the state of the art tests regarding reduced and full-scale tests carried out in North America. The research developments aim to further the preparation of new European seismic regulations for flat slabs, by including analytical models to predict the ultimate rotation capacity of the connections as a function of the gravity shear.

DOI:

10.14359/51737112


12345...>>

Results Per Page