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Title Surface and microstructural properties of photocatalytic cements for pavement applications
URL
Publication Date
Date Accessioned
Degree MS
Discipline/Department Civil Engineering
Degree Level thesis
University/Publisher University of Illinois – Urbana-Champaign
Abstract Thin concrete inlays incorporating flowable fibrous concrete (FFC) mix designs as well as titanium dioxide (TiO2)-containing photocatalytic cements are a promising pavement preservation solution. These multi-functional inlays offer enhanced constructability and structural properties while also benefiting the environment by reacting with harmful nitrogen oxides (NOx) and removing them from the near-road environment. Photocatalytic FFC mixes were prepared in the laboratory to verify feasibility of field application and to characterize how mixture and microstructural properties and environmental factors affect photocatalytic performance. Testing of fresh and hardened concrete confirmed the ease of application of photocatalytic FFC and its benefits to the pavement's structural properties, particularly to residual strength ratio and fracture toughness. Laboratory photoreactor testing of mortar samples established that photocatalytic FFC is an effective tool to mitigate NOx pollution in the urban environment. Carbonation of the sample surface was shown to have the potential to significantly reduce NOx removal ability, but this effect could be curtailed by replacing some of the cement with fly ash or increasing TiO2 content by mass of cement. Spectrophotometer testing showed that reflectance of the mortar samples also factored into photocatalytic performance. More reflective specimens demonstrated greater NOx removal ability, which was most apparent when comparing the performance of white cement specimens to gray cement specimens. Finally, analysis of cement paste specimens using scanning electron microscopy (SEM) and related techniques suggested the importance of porosity to photocatalytic ability. These findings will be useful in helping design and optimize photocatalytic concrete mix designs for applications in pavements and other structures. Based on the results of the mixes and materials tested, a white cement photocatalytic concrete with 15% fly ash replacement would offer the most optimal balance between high photocatalytic efficiency and resilience to carbonation.
Subjects/Keywords Photocatalytic Concrete; Photocatalytic Cement; Titanium Dioxide; Pavement Preservation; Concrete Overlays; Sustainability; Albedo
Contributors Roesler, Jeffery R (advisor)
Language en
Rights Copyright 2016 Daniel King
Country of Publication us
Record ID handle:2142/92656
Repository uiuc
Date Indexed 2018-11-19
Grantor University of Illinois at Urbana-Champaign
Issued Date 2016-07-20 00:00:00

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…emissions. By combining the concept of photocatalytic pavements with FFC mixes, there exists a concrete pavement solution for both sustainability and preservation purposes. 1.2. OBJECTIVES The primary objectives of this thesis were to verify the feasibility…

…of incorporating photocatalytic cements into thin FFC inlays for pavement preservation and to investigate the surface and microstructural properties that affect photocatalytic performance. By characterizing the properties of photocatalytic cements and…

…TiO 2 into the concrete mixture itself for use in medians, barrier walls, or pavements. One potential pavement application for photocatalytic concrete would be for concrete inlays for preservation purposes. The concepts of these thin inlays are to…

…Concrete Flowable fibrous concrete (FFC) technologies have been developed for use in preservation and minor rehabilitation of pavements. Preservation is a strategy to enhance pavement service life by addressing deterioration at an early stage to…

…avoid more extensive and expensive maintenance and rehabilitation. To date, asphalt cement products have been the predominant material used for pavement preservation (Peshkin et al. 2011). Flowable fibrous concrete offers a Portland cement…

…treatment was given to those specimens to promote fiber alignment.) Figure 2.6: Fibers bridging the crack in a single edge notched beam specimen. 2.6. CONCLUSIONS Thin inlays for pavement preservation have the potential to be a very useful application…

…emissions can be tackled is through constructing photocatalytic concrete pavements. By incorporating TiO2 nanoparticles into the pavement structure, it may be possible to improve air quality by attacking the problem directly at the main source of NOx…

…Brouwers, H. J. H. (2010). “NOx Photocatalytic Degradation Employing Concrete Pavement Containing Titanium Dioxide.” Applied Catalysis B: Environmental, 245-254. 4 Bordelon, A. C., and Roesler, J. R. (2011). “Flowable Fibrous Concrete…

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