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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.

Showing 1-3 of 3 Abstracts search results

Document: 

CI4201Xu

Date: 

January 1, 2020

Author(s):

Gang Xu and Xianming Shi

Publication:

Concrete International

Volume:

42

Issue:

1

Abstract:

A geopolymer pervious concrete mixture was developed with alkali activation of fly ash under ambient conditions. A novel nanomaterial, graphene oxide, was used to facilitate the polymerization of fly ash hydration products. The mixture was then exposed to cyclic freezing-and-thawing and salt weathering and the transverse resonance frequency was used to monitor changes induced by these exposures.

DOI:

10.14359/51723474

Document: 

SP-336_03

Date: 

December 11, 2019

Author(s):

Gang Xu, Luis Gerardo Navarro, Kafung Wong, and Xianming Shi

Publication:

Symposium Papers

Volume:

336

Abstract:

In this work, the freeze/thaw resistance and ambient-temperature salt resistance of fly ash geopolymer pervious concrete specimens were investigated separately, to isolate the physical and chemical phenomena underlying their deterioration during “salt scaling”. The laboratory investigation examined four groups of samples, with portland cement or activated fly ash as the sole binder, with or without graphene oxide (GO) modification, respectively. The incorporation of GO significantly improved the resistance of pervious concrete to freeze/ thaw cycles and ambient-temperature salt attack, regardless of the binder type. The specimens were then examined by using X-ray Diffraction (XRD) method, which revealed that the mineralogy and chemical composition of fly ash pastes differed significantly from those of cement pastes. Nuclear magnetic resonance (NMR) was also employed to study the chemical structure and ordering of different hydrates. This work provides an enhanced understanding into the freeze/thaw and salt scaling resistance of fly ash pervious concrete and the role of GO.

DOI:

10.14359/51722455

Document: 

SP-329-20

Date: 

September 26, 2018

Author(s):

P. Gronchi, S. Bianchi, L. Brambilla, and M. Goisis

Publication:

Symposium Papers

Volume:

329

Abstract:

Graphene, graphite nanoplatelets and graphene oxide are emerging nanomaterials for future technologies. Despite the conservative nature of the building industry, nanomaterials are already making their way into some construction applications and nanotechnologies have the potential to open a new season in this field. Recent studies reported mechanical improvements in cement-graphene oxide composites. The interaction between the carbon nanoadditives and C-S-H is not clear yet. In this paper, we investigate whether and how graphite nanoplatelets and graphene oxide affect morphology and kinetics of C-S-H formation, studying the simple reaction between calcium oxide and silica. Influence on hydration by two different types of silica having different specific surfaces was considered. Instrumental analyses of the products were performed through Infrared and Raman spectroscopy, TG and SEM analysis up to four weeks. Results indicate that GO interacts with C-S-H phase and hinders its formation while GNPs remain only dispersed in the matrix.

DOI:

10.14359/51711218

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