C-(N)-S-H and N-A-S-H gels: Compositions and solubility data at 25°C and 50°C
Abstract Calcium silicate hydrates containing sodium [C–(N)–S–H], and sodium aluminosilicate hydrates [N–A–S–H] are the dominant reaction products that are formed following reaction between a solid aluminosilicate precursor (eg, slags, fly ash, metakaolin) and an alkaline activation agent (eg NaOH)...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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2017
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| Online Access: | http://eprints.uanl.mx/17682/1/388.pdf |
| _version_ | 1824414976075366400 |
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| author | Gómez Zamorano, Lauren Yolanda Balonis, Magdalena Erdemli, Bartu Neithalath, Narayanan Sant, Gaurav |
| author_facet | Gómez Zamorano, Lauren Yolanda Balonis, Magdalena Erdemli, Bartu Neithalath, Narayanan Sant, Gaurav |
| author_sort | Gómez Zamorano, Lauren Yolanda |
| collection | Repositorio Institucional |
| description | Abstract Calcium silicate hydrates containing sodium [C–(N)–S–H], and sodium aluminosilicate hydrates [N–A–S–H] are the dominant reaction products that are formed following reaction between a solid aluminosilicate precursor (eg, slags, fly ash, metakaolin) and an alkaline activation agent (eg NaOH) in the presence of water. To gain insights into the thermochemical properties of such compounds, C–(N)– S–H and N–A–S–H gels were synthesized with compositions: 0.8≤Ca/Si≤1.2 for the former, and 0.25≤Al/Si≤0.50 (atomic units) for the latter. The gels were characterized using thermogravimetric analysis (TGA), scanning electron microscopy with energydispersive X-ray microanalysis (SEM-EDS), and X-ray diffraction (XRD). The solubility products (KS0) of the gels were established at 25°C and 50°C. Selfconsistent solubility data of this nature are key inputs required for calculation of mass and volume balances in alkali-activated binders (AABs), and to determine the impacts of the precursor chemistry on the hydrated phase distributions; in which, C–(N)–S–H and N–A–S–H compounds dominate the hydrated phase assemblages.
KEYWORDS calcium silicate hydrate, cements, geopolymers, solubility, thermodynamics |
| format | Article |
| id | eprints-17682 |
| institution | UANL |
| language | English |
| publishDate | 2017 |
| record_format | eprints |
| spelling | eprints-176822024-03-05T16:40:30Z http://eprints.uanl.mx/17682/ C-(N)-S-H and N-A-S-H gels: Compositions and solubility data at 25°C and 50°C Gómez Zamorano, Lauren Yolanda Balonis, Magdalena Erdemli, Bartu Neithalath, Narayanan Sant, Gaurav Abstract Calcium silicate hydrates containing sodium [C–(N)–S–H], and sodium aluminosilicate hydrates [N–A–S–H] are the dominant reaction products that are formed following reaction between a solid aluminosilicate precursor (eg, slags, fly ash, metakaolin) and an alkaline activation agent (eg NaOH) in the presence of water. To gain insights into the thermochemical properties of such compounds, C–(N)– S–H and N–A–S–H gels were synthesized with compositions: 0.8≤Ca/Si≤1.2 for the former, and 0.25≤Al/Si≤0.50 (atomic units) for the latter. The gels were characterized using thermogravimetric analysis (TGA), scanning electron microscopy with energydispersive X-ray microanalysis (SEM-EDS), and X-ray diffraction (XRD). The solubility products (KS0) of the gels were established at 25°C and 50°C. Selfconsistent solubility data of this nature are key inputs required for calculation of mass and volume balances in alkali-activated binders (AABs), and to determine the impacts of the precursor chemistry on the hydrated phase distributions; in which, C–(N)–S–H and N–A–S–H compounds dominate the hydrated phase assemblages. KEYWORDS calcium silicate hydrate, cements, geopolymers, solubility, thermodynamics 2017 Article PeerReviewed text en cc_by_nc_nd http://eprints.uanl.mx/17682/1/388.pdf http://eprints.uanl.mx/17682/1.haspreviewThumbnailVersion/388.pdf Gómez Zamorano, Lauren Yolanda y Balonis, Magdalena y Erdemli, Bartu y Neithalath, Narayanan y Sant, Gaurav (2017) C-(N)-S-H and N-A-S-H gels: Compositions and solubility data at 25°C and 50°C. Journal of the American Ceramic Society, 100 (6). pp. 2700-2711. ISSN 00027820 http://doi.org/10.1111/jace.14715 doi:10.1111/jace.14715 |
| spellingShingle | Gómez Zamorano, Lauren Yolanda Balonis, Magdalena Erdemli, Bartu Neithalath, Narayanan Sant, Gaurav C-(N)-S-H and N-A-S-H gels: Compositions and solubility data at 25°C and 50°C |
| thumbnail | https://rediab.uanl.mx/themes/sandal5/images/online.png |
| title | C-(N)-S-H and N-A-S-H gels: Compositions and solubility data at 25°C and 50°C |
| title_full | C-(N)-S-H and N-A-S-H gels: Compositions and solubility data at 25°C and 50°C |
| title_fullStr | C-(N)-S-H and N-A-S-H gels: Compositions and solubility data at 25°C and 50°C |
| title_full_unstemmed | C-(N)-S-H and N-A-S-H gels: Compositions and solubility data at 25°C and 50°C |
| title_short | C-(N)-S-H and N-A-S-H gels: Compositions and solubility data at 25°C and 50°C |
| title_sort | c n s h and n a s h gels compositions and solubility data at 25°c and 50°c |
| url | http://eprints.uanl.mx/17682/1/388.pdf |
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