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Srinivasarao, Ch.
- Performance of Concrete Containing Granulated Blast Furnace Slag as a Fine Aggregate
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Authors
Affiliations
1 KL University, Vaddeswaram - 522502, Andhra Pradesh, IN
2 Mallareddy College of Engineering, Hyderabad - 500043, Telangana, IN
1 KL University, Vaddeswaram - 522502, Andhra Pradesh, IN
2 Mallareddy College of Engineering, Hyderabad - 500043, Telangana, IN
Source
Indian Journal of Science and Technology, Vol 9, No 38 (2016), Pagination:Abstract
The present challenge in front of Civil Engineers is to find alternative materials for fine aggregates in concrete. Since, most of the State Govt. banned the dredging of river sand. The Granulated blast furnace slag is considered as a fine aggregate in concrete. At present, in India Steel Industry produces about 40 Million Tonnes by 2020 it is estimated to 60 million tonnes. The Author has investigated the effect of compressive strength of concrete, when Granulated blast furnace slag is used (GBFS) as a fine aggregate in concrete. The work includes the partially and fully replacement of river sand by granulated slag in M25 Grade of concrete with a constant 0.45 W/C ratio. Slag replacement of 50, 80, 100% are used. It has been observed that concrete made with 50% of river sand and 50% (GBFS) is nearer to Zero percent replacement. Objectives: To determine the optimum percentage slag replacement as a fine aggregate in concrete which helps in maintaining sustainability of concrete and balancing between the environmental problems due to construction industry as it is necessary to find out the alternative materials for use as fine aggregates because of restrictions by the local authorities. Methods: The experiments are planned to find out the optimum replacement percentage of GBFS against river sand as a fine aggregate in concrete. Mix design for M25 grade of concrete is made with OPC (Ordinary Portland Cement) and PPC (Port land Pozzolana Cement) is considered with a constant 0.45 W/C ratio and slag replacement of 50, 80, 100% are used. 30 Cubes for each cement category of 150 mm size are casted, cured by immersion and tested by CTM. Findings: In both the cement category, the compressive strength and slump of concrete is found reducing with the increase in the percentage of slag as a replacement to fine aggregate. In concrete made with OPC when compared with 50%, 80% and 100% replacement with GBFS reduction upto 96.50%, 87% and 77.5% in strength and 84.6%, 53.84% and 34.6% in slump respectively is observed. In concrete made with PPC when compared with 50%, 80% and 100% replacement with GBFS reduction upto 95.30%, 80% and 63% in strength and 82.7%, 51.7% and 34.0% in slump respectively is observed. Application/Improvements: This study using alternatives to fine aggregate in concrete will help in making concrete economical, reduction in environmental problems and saving the natural resources. The study may be extended to determine the concrete sustainability in saline conditions also.Keywords
Compressive Strength, Granulated Blast Furnace Slag, OPC, PPC, River Sand.Full Text
- Alternative Sources of Soil Organic Amendments for Sustaining Soil Health and Crop Productivity in India – Impacts, Potential Availability, Constraints and Future Strategies
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Authors
A. K. Indoria
1,
K. L. Sharma
1,
K. Sammi Reddy
1,
Ch. Srinivasarao
1,
K. Srinivas
1,
S. S. Balloli
1,
M. Osman
1,
G. Pratibha
1,
N. S. Raju
1
Affiliations
1 ICAR-Central Research Institute for Dryland Agriculture, Hyderabad 500 059, IN
1 ICAR-Central Research Institute for Dryland Agriculture, Hyderabad 500 059, IN
Source
Current Science, Vol 115, No 11 (2018), Pagination: 2052-2062Abstract
Among the several causes, critical low soil organic matter status is predominant for decline in soil health and consequent fall in crop productivity. Over the years, availability of traditional source of soil organic amendment, viz. cattle manure drastically declined due to various reasons (domestic uses as fuel and plastering of the kachha houses). The present study highlights that there are many alternative sources of soil organic amendments available in the country which have tremendous potential to improve soil organic matter status and crop productivity, and rejuvenate and enhance the dying total factor productivity of Indian soils. Data from various sources reveal that about 300 million tonnes of alternative sources of soil organic amendments are available in the country. This study highlights that the application of alternative sources of organic amendments directly or indirectly improves soil health by influencing many soil properties (physical and chemical) and enzyme activities (biological) that regulate nutrient dynamics in the soil. Consequent upon improvement in soil environment, the application of alternative sources of soil organic amendments alone or along with recommended dose of fertilizers registered significantly higher yield in different crops across different agro-climatic conditions of the country. Composting and vermicomposting are the best strategies to convert the biomass of available alternative sources of organic amendments to plant nutrient-rich products.Keywords
Climate Change, Crop Productivity, Organic Amendments, Soil Health.Full Text
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- Indoria, A. K., Sharma, K. L., Sammi Reddy, K. and Srinivasarao, Ch., Role of soil physical properties in soil health management and crop productivity in rainfed systems – II. Management technologies and crop productivity. Curr. Sci., 2016, 110, 320–328.
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- Soil Degradation Challenges for Sustainable Agriculture in Tropical India
Abstract Views :247 |
PDF Views:77
Authors
Ch. Srinivasarao
1,
S. Rakesh
1,
G. Ranjith Kumar
1,
R. Manasa
1,
G. Somashekar
1,
C. Subha Lakshmi1
1,
Sumanta Kundu
2
Affiliations
1 Indian Council of Agricultural Research (ICAR)-National Academy of Agricultural Research Management, Rajendranagar, Hyderabad 500 030, IN
2 ICAR-Central Research Institute for Dryland Agriculture, Hyderabad 500 059, IN
1 Indian Council of Agricultural Research (ICAR)-National Academy of Agricultural Research Management, Rajendranagar, Hyderabad 500 030, IN
2 ICAR-Central Research Institute for Dryland Agriculture, Hyderabad 500 059, IN
Source
Current Science, Vol 120, No 3 (2021), Pagination: 492-500Abstract
Soil degradation is a pervasive, systemic phenomenon and an urgent priority in order to ensure human wellbeing, protect biodiversity and ecosystem services. Agriculture sector is frequently affected by soil loss resulting into unproductive soil and lowered crop yields. This article focuses on critical sustainable challenges of Indian agriculture, soil degradation status and mitigation strategies as well as policies and management response options in respect of development of degraded lands. It also provides policymakers with the necessary information to develop appropriate mitigation technologies at the local, regional and national scale.Keywords
Soil Degradation, Sustainable Agriculture, Mitigation Strategies, Policies.Full Text
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- Mapping surface-water area using time series landsat imagery on Google Earth Engine: a case study of Telangana, India
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1 ICAR-National Academy of Agricultural Research Management, Rajendra Nagar, Hyderabad 500 030, IN
1 ICAR-National Academy of Agricultural Research Management, Rajendra Nagar, Hyderabad 500 030, IN
Source
Current Science, Vol 120, No 9 (2021), Pagination: 1491-1499Abstract
The extent of surface-water spread influences the hydrogeology and ecology of waterbodies. Remote sensing technology provides spatial and temporal datasets which aid in mapping the dynamics of surface waterbodies at the regional and global scale. In the present study, temporal changes in the surface area of waterbodies in Telangana, India, were monitored using indices like normalized difference vegetation index, normalized difference water index and modified NDWI and machine learning algorithms like a random forest using Landsat-8 data. Google Earth Engine cloud computing platform was used for processing earth observation data, based on the time series images of Landsat and compared with real-time groundwater levels. The results showed a significant increase (P < 0.01) in both surface-water area and groundwater levels in Telangana, especially after 2015, which we hypothesize could be due to the specialized water conservation project being implemented by the Government of Telangana since 2015.Keywords
Cloud computing platform, groundwater level, machine learning algorithms, remote sensing, surface area, waterbodies.References
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