Refine your search
Collections
Journals
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All
Achyuthan, Hema
- Pozzolanic Characteristics of Young Toba Tuff
Abstract Views :283 |
PDF Views:116
Authors
Affiliations
1 Department of Geology, Anna University, Chennai 600 025, IN
2 Department of Civil Engineering, Indian Institute of Technology Madras, Chennai 600 036, IN
1 Department of Geology, Anna University, Chennai 600 025, IN
2 Department of Civil Engineering, Indian Institute of Technology Madras, Chennai 600 036, IN
Source
Current Science, Vol 109, No 10 (2015), Pagination: 1869-1874Abstract
Portland Pozzolana Cement (PPC) is widely used to achieve durable and sustainable concrete in modern construction. In the present study, the potential use of natural volcanic ash in the manufacturing of PPC has been studied. Young Toba Tuff (YTT) was collected from Jwalapuram, Andhra Pradesh, India. The pozzolanic performance of this ash was assessed by Strength Activity Index (SAI) and Frattini test. SAI of YTT was found to be above 75% for sufficient pozzolanicity. Further, the results of Frattini test were below the lime solubility curve, indicating that YTT could be potentially useful as pozzolanic material in concrete.Keywords
Concrete, Pozzolanic Characteristics, Strength Activity Index, Volcanic Ash.References
- Petraglia, M. et al., Middle Paleolithic assemblages from the Indian subcontinent before and after the Toba super-eruption. Science, 2007, 317, 114–116.
- Fisher, R. V. and Schmincke, H. V., Pyroclastic Rocks, Springer, Berlin, 1984, p. 472.
- Williams, M., The ∼73 ka Toba super-eruption and its impact: history of a debate. Quaternary Int., 2012, 258, 19–29.
- Dutta, M. and Mukherjee, S., An outlook into energy consumption in large scale industries in India: the cases of steel, aluminium and cement. Energy Policy, 2010, 38, 7286–7298.
- Malhotra, V. M. and Kumar Mehta, P., Pozzolanic and Cementitious Materials, Gordon and Breach Science Publishers, Amsterdam, 1996.
- Antiohos, S. and Tsimas, S., Investigating the role of reactive silica in the hydration mechanisms of high-calcium fly ash/cement systems. Cem. Concr. Compos., 2005, 27, 171–181.
- Rahhal, V. and Talero, R., Calorimetry of Portland cement with silica fume, diatomite and quartz additions. Constr. Build. Mater., 2009, 23, 3367–3374.
- Tironi, A., Trezza, M. A., Scian, A. N. and Irassar, E. F., Assessment of pozzolanic activity of different calcined clays. Cem. Concr. Compos., 2013, 37, 319–327.
- Bendapudi, S. C. K. and Saha, P., Contribution of fly ash to the properties of mortar and concrete. Int. J. Earth Sci. Eng., 2011, 4, 1017–1023.
- Habert, G., Choupay, N., Escadeillas, G., Guillaume, D. and Montel, J. M., Clay content of argillite: influence on cement based mortars. Appl. Clay Sci., 2009, 43, 322–330.
- Schulz, H., Emeis, K. C., Erlenkeuser, H., Von Rad, U. and Rolf, C., The Toba volcanic event and interstadial/stadial climates at the marine isotopic stage 5 to 4 transition in the Northern Indian Ocean. Quaternary Res., 2002, 57, 22–31.
- Acharya, S. K. and Basu, P. C., Toba ash in the Indian subcontinent and its implications for correlation of late Pleistocene alluvium. Quaternary Res., 1993, 40, 10–19.
- Chesner, C. A., Petrogenesis of the Toba Tuffs, Sumatra, Indonesia. J. Petrol., 1998, 39, 397–438.
- Jones, M. T., Sparks, R. S. J. and Valdes, P. J., The climatic impact of super volcanic ash blankets. Climate Dyn., 2007, 29, 553–564.
- Haslam, M. et al., A southern Indian Middle Palaeolithic occupation surface sealed by the 74 ka Toba eruption: further evidence from Jwalapuram Locality 22. Quaternary Int., 2012, 258, 148–164.
- Raj, R., Occurrence of volcanic ash in the Quaternary alluvial deposits, lower Narmada basin, western India. J. Earth Syst. Sci., 2008, 117, 41–48.
- Down, M. J., Master, R. W., Streckeisen, A. and Zanetti, B., A chemical classification of volcanic rocks based on the total alkali–silica diagram. J. Petrol., 1986, 27(3), 745–750.
- IS: 1727, Indian standard specification for methods of test for pozzolanic materials. Bureau of Indian Standards, New Delhi, 1967.
- IS 3812, Indian standard specification for fly ash for use as pozzolana and admixtures. Bureau of Indian Standards, New Delhi, 1981.
- ASTM C311, Standard specification for sampling and testing fly ash or natural pozzolans for use in Portland-Cement Concrete, ASTM, USA, 2002.
- BS EN 196(5), Standard specification for testing cement – Pozzolanicity tests for pozzolanic cement, BSI, London, 2005.
- Donatello, S., Tyrer, M. and Cheeseman, C. R., Comparison of test methods to assess pozzolanic activity. Cem. Concr. Compos., 2010, 32, 121–127.
- ASTM C618, Standard specification for coal fly ash and raw or calcined natural pozzolan for use in concrete, ASTM, USA, 2003.
- Frias, M., Villar-cocin, E. and Valencia-Morales, E., Characterisation of sugar cane straw waste as pozzolanic material for construction, calcining temperature and kinetic parameters. Waste Manage., 2007, 27, 533–538.
- Hamidi, M., Kacimi, L., Cyr, M. and Clastres, P., Evaluation and improvement of pozzolanic activity of andesite for its use in eco-efficient cement. Constr. Build. Mater., 2013, 47, 1268–1277.
- Tironi, A., Trezza, M. A., Scian, A. N. and Irassar, E. F., Kaolinitic calcined clays: factors affecting its performance as pozzolans. Constr. Build. Mater., 2012, 28, 276–281.
- Janotka, I., Puertas, F., Palacios, M., Kuliffayová, M. and Varga, C., Metakaolin sand-blended-cement pastes: rheology, hydration process and mechanical properties. Constr. Build. Mater., 2010, 24, 791–824.
- Tafoni along the East Coast, Chennai to Mamallapuram, Tamil Nadu
Abstract Views :335 |
PDF Views:146
Authors
Affiliations
1 Department of Geology, Anna University, Chennai 600 025, IN
1 Department of Geology, Anna University, Chennai 600 025, IN
Source
Current Science, Vol 109, No 1 (2015), Pagination: 195-201Abstract
A study on weathering pits called tafoni was carried out on rock surfaces that age from a few hundreds to millions of years along the east coast between Chennai and Mamallapuram. Tafoni of varying sizes and shapes such as simple circular dots to oblate to prolate, hemispherical to spherical are formed on the granite, granite gneiss, charnockites (acid and mafic) and sandstone both on exposed and inner wall surfaces. In this study, their formation is related to not only tropical weathering processes, but also to sea salt water splays causing salt mineral etching, weathering processes, besides microbial activity, algal and lichen growth accentuating their formation.Keywords
Bedrock Surface, Mafic Minerals, Tafoni, Weathering Processes.- Organic Matter Source in the Freshwater Tropical Lakes of Southern India
Abstract Views :251 |
PDF Views:139
Authors
Affiliations
1 Department of Geology, Anna University, Chennai 600 025, IN
1 Department of Geology, Anna University, Chennai 600 025, IN