Journal article
Diatomaceous Earth as a Pozzolan in the Fabrication of an Alkali-Activated Fine-Aggregate Limestone Concrete
Journal of the American Ceramic Society, v 93(9), pp 2828-2836
01 Sep 2010
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Two concretes-with Ca/Si ratios of 0.28 and 1.75 fabricated by cementing a fine-limestone aggregate with a mixture of lime, diatomaceous earth, and water-were compared with ones made with pure lime and a hydraulic lime product, containing similar to 11 wt% naturally occurring reactive silica. When the Ca/Si ratio in the cementing phase was 0.28, compressive strengths of similar to 6.5 MPa after 30 days and similar to 7 MPa after 180 days were achieved by curing the samples in closed containers or in 100% relative humidity. When allowed to dry, however, these samples lost roughly half their compressive strength in 7 days. Increasing the Ca/Si ratio to 1.75 solved the drying problems. The resulting compressive strengths, however, after 180 days, were reduced to 5 MPa. Characterization of the various cementing phases formed in the different samples by X-ray diffraction, Fourier transform infrared spectroscopy, and thermogravimetric analysis showed the formation of two, somewhat competing, cementing reactions: C-S-H gel formation which results in early strength gains, and the recarbonation of portlandite, which results in longer term strength enhancements.
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Details
- Title
- Diatomaceous Earth as a Pozzolan in the Fabrication of an Alkali-Activated Fine-Aggregate Limestone Concrete
- Creators
- Sean A. Miller - Drexel UniversityAaron R. Sakulich - Drexel UniversityMichel W. Barsoum - Drexel UniversityEva Jud Sierra - Drexel University
- Publication Details
- Journal of the American Ceramic Society, v 93(9), pp 2828-2836
- Publisher
- Wiley
- Number of pages
- 9
- Grant note
- Swiss National Science Foundation; Swiss National Science Foundation (SNSF); European Commission DMR-0907430 / National Science Foundation, Division of Materials Science, Ceramics; National Science Foundation (NSF); United States Department of Energy (DOE)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000281657600083
- Scopus ID
- 2-s2.0-77956387403
- Other Identifier
- 991019167755504721
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Data related to this publication, from InCites Benchmarking & Analytics tool:
- Web of Science research areas
- Materials Science, Ceramics