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Home > Publications > International Concrete Abstracts Portal
Showing 1-5 of 5 Abstracts search results
Document:
CI4505Spotlight_IndustryWorks
Date:
May 1, 2023
Publication:
Concrete International
Volume:
45
Issue:
5
Abstract:
Pilot research programs are being conducted to develop commercially viable options that can potentially impact the carbon footprint of concrete industry. The article discusses two such programs: developing a high-performance, graphene-enhanced cement and creating a software for optimizing concrete mixtures based on historical data on materials and mixture performance.
SP-355_12
July 1, 2022
Author(s):
Alberto Belli, Alessandra Mobili, Tiziano Bellezze, Paulo B. Cachim, Francesca Tittarelli
Symposium Papers
355
This work investigates the potential of recycled carbon-based materials, obtained from industrial by-products, for the production of multifunctional cement-based composites (MCC) with self-sensing behavior, usable in structural health monitoring (SHM) systems. As recycled materials, used foundry sand (UFS) and recycled carbon fibers (RCF) have been chosen, whereas graphene nanoplatelets (GNP) and virgin carbon fibers (VCF) have been selected as reference industrial fillers and fibers, respectively. Their effects on OPC-based mortars have been tested in terms of mechanical strength (compressive, flexural), durability (water absorption), microstructure (porosity), and electrical and piezoresistive behavior (resistivity in static and under-load conditions). The results show that the combination of recycled fillers-fibers gives the best results in terms of workability, microstructure, strength, and durability. The worst compressive performances obtained with GNP are related to its hydrophobicity and the related problems in mixing. On the other hand, mixtures with UFS show a low electrical conductivity, but a high sensitivity to deformation (electrical strain-sensing). High-carbon by-products could be a functional, low-cost, and eco-friendly solution to produce high-performance and conductive concretes for self-monitoring systems.
DOI:
10.14359/51736018
CI4201Xu
January 1, 2020
Gang Xu and Xianming Shi
42
1
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.
SP-336_03
December 11, 2019
Gang Xu, Luis Gerardo Navarro, Kafung Wong, and Xianming Shi
336
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.
10.14359/51722455
SP-329-20
September 26, 2018
P. Gronchi, S. Bianchi, L. Brambilla, and M. Goisis
329
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.
10.14359/51711218
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