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 27639 Abstracts search results

Document: 

CI4212Farrell

Date: 

December 1, 2020

Author(s):

Tripp Farrell

Publication:

Concrete International

Volume:

42

Issue:

12

Abstract:

This article provides guidance on concrete pumps for contractors looking to expand their services into shotcrete. It discusses the use of rotary gunite machines for dry-mix shotcrete and four pump types that are available for delivering wet-mix concrete: swing tube piston, squeeze tube (peristaltic), rotor stator (progressive cavity), and hydraulic ball valve pumps.


Document: 

CI4212OfficerNom

Date: 

December 1, 2020

Publication:

Concrete International

Volume:

42

Issue:

12

Abstract:

The nominee for ACI President in 2021-2022 is Cary S. Kopczynski, CEO and Senior Principal of Cary Kopczynski & Company, Seattle, WA, USA. If elected during membership balloting, he will serve a 1-year term as ACI President that begins at the conclusion of the ACI Concrete Convention Spring 2021 and ends at the conclusion of the ACI Convention Spring 2022


Document: 

CI12HonorsandAwards

Date: 

December 1, 2020

Publication:

Concrete International

Volume:

42

Issue:

12

Abstract:

The American Concrete Institute showcases the contributions and efforts of its global membership and the concrete industry worldwide through its varied honors and awards program.


Document: 

CI4212ProductGuide

Date: 

December 1, 2020

Publication:

Concrete International

Volume:

42

Issue:

12

Abstract:

The Concrete Product and Service Guide comprises company names, URLs, and key phone numbers. We have maintained most of the product categories from previous guides, and we have added services, including industry associations, consulting firms, contractors, and testing agencies.


Document: 

CI4212Q&A

Date: 

December 1, 2020

Publication:

Concrete International

Volume:

42

Issue:

12

Abstract:

Q: Last winter, we placed concrete grade beams for an industrial building. A technician from the owner’s testing agency took test cylinders but left them unprotected in the cold weather for a week. At 28 days, the average cylinder compressive strength was 2750 psi. Because this was far below the specified fc of 6000 psi, the engineer required three cores to be taken to evaluate the in-place concrete strength. The individual core compressive strengths were 4940, 4970, and 5370 psi, resulting in an average strength of 5090 psi (84.8% of fc). The engineer rejected the concrete on the basis that the ACI 318-19 Code1 requires the average core strength to equal 85% of the specified strength. In this case, 0.85 fc = 5100 psi, so isn’t the average core strength of 5090 psi close enough?


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