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PMSS Project Details

 

Project ID:FHWA-PROJ-10-0083
Project Name: Use of Nanoporous Thin Films (NPTF) to Improve Aggregate-Cement Interface
Status: Active
Contact:
Last Name:Youtcheff
First Name:Jack
Telephone:202-493-3090
E-mail:jack.youtcheff@dot.gov
Office: Office of Infrastructure Research and Development
Team:Pavement Materials Team
Roadmap/Focus area(s): Infrastructure Research and Technology Strategic Plan and Roadmap
Project Description:Synthesize sol-gel nanoaluminosilicates with various Si/Al ratios and characterize the effect on hydration of Alite and Portland cement. Develop characterization procedures for characterizing paste samples, and tailor solubility of nanoaluminosilicate thin films through inorganofunctionalization to optimize performance.
Laboratories: Chemistry Laboratory
Concrete Laboratory
Start Date: April 1, 2010
End Date: April 1, 2013
Goals:Design new types of concrete nanoadditives to enhance the long-term mechanical performance of cementitious materials.
Test Methodology: Spectroscopic characterization of cement pastes conducted using surface-enhanced Raman spectroscopy (SERS) and Fourier-Transform Infrared (FTIR); nanomaterial dispersion evaluated using scanning electron microscopes (SEM).
Expected Benefits:Improvement in performance of hydraulic cements through the use of nanomaterials.
Deliverables:Name: Mechanism for using nanoparticles to strengthen the interfacial transition zone (ITZ) in concrete.
Product Type(s): Research report, Article
Description: Fundamental understanding of interfacial transition zone (ITZ) and the effect of aluminosilicates on the composition of cement pore solution during early hydration stage.
Project Findings:Optimized surface-enhanced Raman spectroscopy (SERS) colloids to enable the characterization of calcium silicate hydrate (CSH) in concrete samples. Fourier Transform Infrared (FTIR) of xerogels analysis indicated no major sign of Si-O-Al (silica-oxygen-aluminum) formation when combining nanosilica with nanoboehmite or gibbsite. Calorimetry data indicate that silica and Si-O2-AlOOH (boehmite) mixes accelerate the hydration of C3S (alite) and C3A (tricalcium aluminate); however, boehmite and mixtures of Si-O2-AlOOH-rich boehmite only have an effect on the C3A.   Combinations of Si-O2-AlOOH accelerated the hydration reaction of the cement to a higher degree than nanosilica and boehmite individually; this effect is dependent on the silicon-to-aluminum ratio and correlates with this acceleration. Optimal Si to Al ratio found to be 0.65.
Keywords: Materials
Cement
Cement Paste
Hydration
Infrastructure
Spectroscopy
Research
Subject Areas: Materials