Home > Publications > International Concrete Abstracts Portal


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 547 Abstracts search results

Document: 

SP-363-1

Date: 

July 1, 2024

Author(s):

Raid S. Alrashidi, Rami Zamzami, Megan S. Voss, Daniel J. Alabi, Christopher C. Ferraro, H. R. Hamilton, Joel B. Harley, and Kyle A. Riding

Publication:

Symposium Papers

Volume:

363

Abstract:

The presence of chloride ions is one of the most widespread causes of corrosion initiation in reinforcing steel in concrete. Trace chlorides present in cementitious materials or admixtures typically result in very low fresh chloride contents in normal-strength concrete that do not present a danger of corrosion. UHPC mixture designs, however, use much higher dosages of cementitious materials and admixtures that can result in non-negligible total fresh chloride contents. These high chloride values are likely to occur more frequently in the future as more UHPC mixtures are made with locally available materials and alternative cementitious materials and may result in concrete mixtures failing to meet specifications for fresh chloride content limits that are based on mixture proportions used in normal-strength concrete mixtures. UHPC and normal concrete samples were made without fibers and with increasing levels of internally admixed chlorides for four different levels of strength to determine chloride thresholds for internally added chlorides. The chloride threshold for fresh concrete was measured using a slightly modified version of the accelerated test EN 480-14. The water-soluble and acid-soluble chloride ion content of UHPC mixtures tested were measured according to ASTM C1218 and Florida Method FM 5-516 to determine the bound chlorides and fresh chloride limits for corrosion. The results demonstrate that the UHPC had ~ 25% higher chloride threshold than the control mixture when measured as an absolute content per unit volume of concrete. When the UHPC chloride content is normalized by mass of cementitious material, it was found that the amount needed to initiate corrosion may be lower than fresh chloride limits given in ACI-318 and ACI 222. Therefore, the ACI-318 water-soluble chloride limits as a % by mass of cementitious materials were found to be non-conservative for the two of the UHPC mixtures tested and should be re-examined for UHPC.

DOI:

10.14359/51742104

Document: 

SP-362_69

Date: 

June 18, 2024

Author(s):

Eliana Soldado, Hugo Costa, Ricardo do Carmo, and Eduardo Júlio

Publication:

Symposium Papers

Volume:

362

Abstract:

The addition of supplementary cementitious materials (SCMs) to low-carbon concrete mixtures has been investigated in recent years as part of the sustainability of the concrete sector. Recently, most traditional SCMs, such as fly ash and blast furnace slags, have become unavailable in several developed countries, mostly due to environmental restrictions. Consequently, several new by-products from fast-growing sectors are being considered as potential replacements for traditional SCMs. However, the durability of these new by-products in low-carbon concrete has not been thoroughly explored. As a result, this paper presents the first part of a project related to an extensive experimental characterization, in which low-carbon concrete with high compactness, paste optimization, and partial cement replacement by the addition of waste by-products from the agricultural, metallurgical, paper, and glass industries is studied. Alternative SCMs including rice husk ash, biomass fly ash, rock wool residues, or waste foundry sand are incorporated into corresponding mortar matrices and the results concerning the mechanical properties (flexural and compressive strength) and durability (capillary water absorption, surface electrical resistivity, and carbonation resistance) are presented and analyzed. The outcomes indicate that it is possible to reduce the Portland cement content without compromising the mechanical and durability properties of the concrete.

DOI:

10.14359/51742019

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: 

CI4510Weilacher

Date: 

September 29, 2023

Author(s):

Weilacher, R.M.; Newsome, J.; and Harrison, G.H.

Publication:

Concrete International

Volume:

45

Issue:

10

Abstract:

Riverworks at Eastern Wharf is a mixed-use development in Savannah, GA, USA. A massive fire at the construction site caused severe damage to this project. The article describes the investigation of the structure’s condition after the fire, damage evaluation, and repair of the concrete structure of the podium slab and post-tensioning cables.

Document: 

CI4501Chopperla

Date: 

January 1, 2023

Author(s):

Krishna Siva Teja Chopperla, Sivakumar Ramanathan, Robert J. Moon, O. Burkan Isgor, and W. Jason Weiss

Publication:

Concrete International

Volume:

45

Issue:

1

Abstract:

The addition of cellulose nanomaterials to cementitious materials has been shown to alter rheology, setting times, degree of hydration, and mechanical properties The article discusses implementation of cellulose nanocrystals (CNCs) in three full-scale concrete placements (parking lot, bridge girder, and slab-on-ground) to examine the potential of using CNCs in the field.

12345...>>

Results Per Page