International Concrete Abstracts Portal

Showing 1-5 of 1389 Abstracts search results

Document: 

CI4610ConcreteQA

Date: 

October 1, 2024

Publication:

Concrete International

Volume:

10

Issue:

46

Abstract:

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.


Document: 

SP363

Date: 

July 25, 2024

Author(s):

ACI Committee 345

Publication:

Symposium Papers

Volume:

363

Abstract:

Ultra-high performance concrete (UHPC) is a state-of-the-art cementitious composite. Since the concept of this novel concrete mixture emerged in the 1990s, significant advancements have been made with numerous benefits such as high strength, flowability, high post-cracking tensile resistance, improved durability, reduced maintenance, and extended longevity. Currently, UHPC is employed around the globe alongside recently published practice guidelines. Although numerous research projects were undertaken to examine the behavior of UHPC-incorporated structures, there still are many gaps to be explored. Of interest are the development of robust and reliable mixtures and their application to primary load-bearing members for bridges and buildings, including various site demonstration projects that would promote the use of this leading-edge construction material. This Special Publication (SP) contains nine papers selected from three technical sessions held in the ACI Spring Convention in March 2022. All manuscripts were reviewed by at least two experts in accordance with the ACI publication policy. The Editors wish to thank all contributing authors and anonymous reviewers for their rigorous efforts. The Editors also gratefully acknowledge Ms. Barbara Coleman at ACI for her knowledgeable guidance. Yail J. Kim, Steven Nolan, and Antonio Nanni Editors University of Colorado Denver Florida Department of Transportation University of Miami

DOI:

10.14359/51742116


Document: 

SP-362_74

Date: 

June 18, 2024

Author(s):

Camille Martin--Cavaillé, Alexandra Bourdot, Olivier Rateau, Malo L’helguen, Nassim Sebaibi, and Rachid Bennacer

Publication:

Symposium Papers

Volume:

362

Abstract:

A possible way to reduce CO2 emissions linked to cementitious materials is to use alternative resources, particularly co-products from other industries. Oyster shell co-products are a calcareous resource produced by aquaculture currently available in coastal areas and must be valorized. The present study investigates the impact of crushed oyster shells used as aggregates in concrete on its mechanical behavior. Thus, concrete samples with 50% aggregates replaced by crushed oyster shells were formulated. Two different types of cement were used: CEMI for reference and low-carbon cement CEMIII-C. Mechanical strength and Young’s modulus were assessed at 28 days, and cracking under compression was followed by acoustic emission technique. Results show that oyster shell aggregates slightly reduce concrete's mechanical resistance but significantly decrease its Young’s modulus. However, cracking behavior under compression remains similar during compression loading.

DOI:

10.14359/51742024


Document: 

CI4605Jana

Date: 

May 1, 2024

Author(s):

Dipayan Jana

Publication:

Concrete International

Volume:

46

Issue:

5

Abstract:

Even at a level of less than 0.5% by mass of aggregate, pyrrhotite can cause extensive cracking and crumbling of concrete. Because such type of deterioration is rather new, a proper testing protocol to forecast potential damage in concrete is needed. The article discusses important factors that should be considered when developing such performance-based test protocol.


Document: 

SP-360_20

Date: 

March 1, 2024

Author(s):

Emmanuel Ferrier, Laurent Michel, Andrea Armonico

Publication:

Symposium Papers

Volume:

360

Abstract:

This paper presents the crack monitoring of reinforced concrete beams strengthened with fiber reinforced polymer (FRP) sheets. Emphasis is placed on the development of a smart FRP bonded material that can measure the crack opening of a reinforced concrete beam strengthened by FRP. The reliability measured by a conventional digital image correlation (DIC) and by the proposed smart FRP is employed to assess the contribution of the FRP to control the crack. The monitoring process is based on a large set of experimental database consisting of 19 test beams. The effect of FRP to control the crack opening is studied depending on the steel ratio, FRP ratio and the level of damaged of RC beams when FRP is applied. The results were compared with the theoretical values of crack width and spacing predicted using the Eurocode 2 (EC2) formula, calibrated for non-strengthened RC elements. The corresponding results were compared in order to clarify the effect of external bonded FRP on the cracking behaviour of RC beams.

DOI:

10.14359/51740632


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