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Home > Publications > International Concrete Abstracts Portal
Showing 1-5 of 6 Abstracts search results
Document:
SP-355_15
Date:
July 1, 2022
Author(s):
Johann Plank, Lei Lei
Publication:
Symposium Papers
Volume:
355
Abstract:
Polycarboxylates (PCEs) currently dominate the global superplasticizer market. Among them, HPEG and IPEG PCEs have attained a prominent position as they present the most cost-effective PCEs known at present. Recently, novel vinyl ether PCEs designated as EPEG and GPEG PCEs were introduced, thus broadening the family of VPEG PCEs, and their overall performance is still evaluated. Well documented are now the advantages of novel phosphated comb polymers which can significantly reduce the stickiness of concrete e.g. in UHPC. In spite of many attempts, so far no overall cost-effective clay tolerant superplasticizer has been identified, the challenge being that such a structure must include side chains that however do not contain polyethylene glycol/polypropylene glycol (PEG/PPG) or polyamines. Fortunately, for calcined clay blended cements, HPEG PCEs of specific molecular design as well as zwitterionic (amphoteric) PCEs have proven to be highly effective. Moreover, AAS binder systems were successfully fluidized with APEG or HPEG PCEs exhibiting particularly short side chains (nEO < 10). This review underlines the critical role that innovation in chemical admixtures will play in the future to facilitate a successful migration to low-carbon binders.
DOI:
10.14359/51736021
CI4407DestreeMobasher
Xavier Destrée and Barzin Mobasher
Concrete International
44
Issue:
7
The authors discuss an article by J.L. Silfwerbrand, “Industrial Fiber Concrete Floors,” published in the May 2021 issue of CI. Focusing on Belgian/Continental and Swedish approaches to the design of steel fiber-reinforced concrete slabs, the article presents an alternative perspective based on recent publications and latest developments in design and testing.
CI4309Q&A
September 1, 2021
Jim Klinger
43
9
Q. I’m working on a project that requires my team to place concrete on various substrates prepared by other subcontractors. What should I focus on when accepting these substrates to avoid any unnecessary issues?
CI4306ConcreteQ&A
June 1, 2021
Bruce Suprenant
6
Q.Who is responsible for coordinating construction tolerances on a project: the designer or the contractor?
CI4101Paul
January 1, 2019
William Paul, James Klinger, and Bruce A. Suprenant
41
1
The American Society of Concrete Contractors (ASCC) organized a study to evaluate laser scanning results as an acceptance tool for concrete tolerance applications. The study was conducted on a construction site in Walnut Creek, CA. Eight participants used their standard procedures to scan portions of the site, and their measurements were compared against independently obtained reference data.
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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.
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