International Concrete Abstracts Portal

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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.

International Concrete Abstracts Portal

Showing 1-10 of 162 Abstracts search results

Document: 

SP-336_01

Date: 

December 11, 2019

Author(s):

James Lafikes, Rouzbeh Khajehdehi, Muzai Feng, Matthew O’Reilly, David Darwin

Publication:

Special Publication

Volume:

336

Abstract:

Supplementary cementitious materials (SCMs) in conjunction with pre-wetted fine lightweight aggregate to provide internal curing are being increasingly used to produce high performance, low-shrinking concrete to mitigate bridge deck cracking, providing more sustainable projects with a longer service life. Additionally, the SCMs aid in concrete sustainability by reducing the amount of cement needed in these projects. This study examines the density of cracks in bridge decks in Indiana and Utah that incorporated internal curing with various combinations of portland cement and SCMs, specifically, slag cement, Class C and Class F fly ash, and silica fume, in concrete mixtures with water-cementitious material ratios ranging from 0.39 to 0.44. When compared with crack densities in low-cracking high-performance concrete (LC-HPC) and control bridge decks in Kansas, concrete mixtures with a paste content higher than 27% exhibited more cracking, regardless of the use of internal curing or SCMs. Bridge decks with paste contents below 26% that incorporate internal curing and SCMs exhibited low cracking at early ages, although additional surveys will be needed before conclusions on long term behavior can be made.


Document: 

CI4111ExcellenceConcrete

Date: 

November 1, 2019

Publication:

Concrete International

Volume:

41

Issue:

11

Abstract:

Projects that received the Excellence in Concrete Construction Awards for 2019 were selected based on architectural and engineering merit, creativity, innovative construction techniques or solutions, innovative use of materials, ingenuity, sustainability and resilience, and functionality. King Abdulaziz Center for World Culture (ITHRA), Eastern Province, Saudi Arabia, won the Overall Excellence Award and the first-place in Mid-Rise Buildings category.


Document: 

SP334

Date: 

October 9, 2019

Author(s):

Moncef L. Nehdi

Publication:

Special Publication

Volume:

334

Abstract:

To improve the eco-efficiency and sustainability of concrete, the cement and concrete industry can exploit many byproducts in applications that could, in some cases, outperform conventional materials made with traditional ingredients. This Special Publication of the American Concrete Institute Committee 555 (Concrete with Recycled Materials) is a contribution towards improving the sustainability of concrete via using recycled materials, such as scrap tire rubber and tire steel wire fiber, GFRP waste, fluff, reclaimed asphalt pavements, recycled latex paint, and recycled concrete aggregate. Advancing knowledge in this area should introduce the use of recycled materials in concrete for applications never considered before, while achieving desirable performance criteria economically, without compromising the quality and long-term performance of the concrete civil infrastructure.


Document: 

SP-334-10

Date: 

September 30, 2019

Author(s):

Ahmed A. Gheni and Mohamed A. ElGawady

Publication:

Special Publication

Volume:

334

Abstract:

Statistics show an increase in the use of fly ash in concrete to improve both sustainability and performance. However, concrete incorporating high volume fly ash has encountered an issue with incompatibility between fly ash and air entraining admixture (AEA). This study investigates using ground recycled rubber (GRR) as an eco-friendly alternative to AEA to improve the freeze-thaw performance of mortar mixtures incorporating two different types and ratios of fly ash. Two different sizes and ratios of GRR were used in this study. The results were compared with mixtures having two different types and dosages of AEA as well as a reference mortar mixture having neither GRR nor AEA. Foam indices were determined for both types of fly ash and compared with cement. The compressive strength retention values of mortar cubes after exposing them to 36 freeze-thaw cycles were determined and linked to the air content of each mixture. This study revealed that the GRR outperformed the AEA in terms of the freeze-thaw durability where all mixtures retained their compressive strengths. However, the performance of mixtures including AEA was inconsistent depending on the chemical composition of the fly ash, fly ash replacement ratio, and AEA dosage.


Document: 

CI4108NPCASustainabilityAwards

Date: 

August 1, 2019

Publication:

Concrete International

Volume:

41

Issue:

8

Abstract:

The Sustainability Awards program of the National Precast Concrete Association (NPCA) recognizes member companies for contributing to sustainable construction projects and for instituting sustainable practices in their plants.


Document: 

CI4108Moehle

Date: 

August 1, 2019

Author(s):

Jack P. Moehle

Publication:

Concrete International

Volume:

41

Issue:

8

Abstract:

ACI Committee 318 has completed the technical work for “Building Code Requirements for Structural Concrete (ACI 318-19) and Commentary (ACI 318R-19).” For the present Code cycle, the committee focused on technical changes to improve safety, economy, and sustainability, while introducing new technologies and ideas to advance the concrete industry. The article summarizes some of the key changes for the ACI 318-19 Code.


Document: 

CI4108Azarijafari

Date: 

August 1, 2019

Author(s):

Hessam Azarijafari, Julie K. Buffenbarger, and Sean Monkman

Publication:

Concrete International

Volume:

41

Issue:

8

Abstract:

The Eco Concrete Competition was proposed by ACI Committee 130 in 2014 with the goal of promoting mixture design as an important aspect of concrete sustainability. The rules require students to design two mixtures with the same water-binder ratio (w/b) but different constituents: the base case scenario (BCS) and the alternative case scenario (ACS). Teams are evaluated based on comparisons of the environmental impacts of the BCS and ACS mixtures.


Document: 

CI4105Rowland

Date: 

May 1, 2019

Author(s):

Larry Rowland, Michele Di Marino, and Jesper Sand Damtoft

Publication:

Concrete International

Volume:

41

Issue:

5

Abstract:

A shrinkage-reduced, self-consolidating, high-performance concrete that can be used for production of thin elements with high aesthetic, mechanical, and durability performance requirements was recently developed. The prepackaged dry mixture comprises Aalborg White® portland cement, ground carbonate, and reactive metakaolin. The combination results in high performance as well as a low CO2 footprint.


Document: 

SP331

Date: 

March 1, 2019

Author(s):

ACI Committee 345, ACI Committee 201, Yail J. Kim, Isamu Yoshitake, and Mark F. Green

Publication:

Special Publication

Volume:

331

Abstract:

Sustainability is one of the salient requirements in modern society. Structures frequently deteriorate because of aggressive service environments; consequently, federal and state agencies expend significant endeavors to maintain the quality of the structures. Among many factors, durability plays a major role in accomplishing the concept of sustainability. Extensive research has been conducted to understand the deterioration mechanisms of concrete and to extend the longevity of concrete members. Over the past decades, the advancement of technologies has resulted in durable construction materials such as advanced composites. This Special Publication (SP) contains nine papers selected from two technical sessions held in the ACI Spring Convention at Detroit, MI, in March 2017. All manuscripts were reviewed by at least two experts in accordance with the ACI publication policy.


Document: 

CI4103Sakai

Date: 

March 1, 2019

Author(s):

Koji Sakai and Julie K. Buffenbarger

Publication:

Concrete International

Volume:

41

Issue:

3

Abstract:

The ACI Concrete Sustainability Forum XI was held at The ACI Concrete Convention and Exposition – Fall 2018 in Las Vegas, NV. The event concluded the Forum series that originated in 2008. It included presentations on sustainability assessor certification program; incorporation of sustainability into the ACI Code, ISO Standard, and fib Model Code; resilience-based design; and an innovative bridge technology; and it concluded with a panel discussion.


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