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Achyuthan, Hema
- Pozzolanic Characteristics of Young Toba Tuff
Abstract Views :205 |
PDF Views:79
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.Full Text
References
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- Tafoni along the East Coast, Chennai to Mamallapuram, Tamil Nadu
Abstract Views :225 |
PDF Views:105
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.Full Text
- Organic Matter Source in the Freshwater Tropical Lakes of Southern India
Abstract Views :184 |
PDF Views:98
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 111, No 1 (2016), Pagination: 168-176Abstract
In this article, sediment texture, calcium carbonate, organic matter (OM), total organic carbon (TOC), total nitrogen (TN) and C/N ratio analysis of lake floor sediments of the Berijam and Kukkal lakes located nearly 2000 m amsl in the Palani Hills, Tamil Nadu, India are presented. This study was carried out to decipher the spatial distribution, origin of OM and the relationship among the components. TOC, TN% and C/N ratio of the Berijam lake sediments indicate a mixed source of OM (terrestrial and in situ lake algae and other biota), while for the Kukkal lake it is due to algae, aquatic weeds and plant detritus that grow along its margins. The lake margins and lake-bed morphology control the distribution of sediment particulate matter and texture.Keywords
Algae, Freshwater Lakes, Organic Matter, Particulate Matter, PCA Analyses, Sediment Texture.Full Text