Characterisation of Bauxite and Laterite ores in Yercaud Hill, Salem District, Tamil Nadu, India | Chapter 7 | Geography, Earth Science and Environment: Research Highlights Vol. 10

The charnockitic suite of rocks underlying the bauxite deposits of Yercaud Hill consists of quartz, plagioclase and potash feldspar, ortho and clino-pyroxenes, garnet and secondary hornblende. Bauxite consists mainly of aluminum hydroxide minerals. Bauxite occurs in Yercaud Hill as a part of the Eastern Ghats range of Tamil Nadu of the Achaean age. It is formed due to residual weathering and lateritization of Achaean charnockite. In the study area, bauxite consists of hydrous aluminum oxides, aluminum hydroxides and laterites, which are mostly found in humid tropical climatic conditions due to intense weathering of the parent rock. The XRD study shows that gibbsite (Al (OH)₃), goethite (FeO(OH)) and hematite (Fe₂O₃) are the major minerals in the bauxites. From the XRF analysis, the major oxides are Al₂O_3, Fe₂O_3, SiO₂, TiO₂, P₂O₅, and Cr₂O_3. Based on the Al₂O_3, SiO_2, Fe₂O₃ ternary plot, bauxites of this region have undergone strong lateritization. According to the chemical classification of laterites, Yercaud bauxites are categorized as Ferrite and Bauxitic Ferrite with some amounts of bauxite. At high Al₂O₃ weight percentage (86%), low Fe₂O₃ concentration (10.56%), and TiO₂ (0.49%) indicates it as a high-grade Bauxite of aluminium hydroxides mineral Gibbsite (Exploited mines-III, Semmedu). High Fe₂O₃ constitutes (77.61% by weight), low Al₂O₃  (18.22%) and 0.89 % TiO₂ portrays it as iron-rich laterite (Exploited mines – I, Manjakuttai). This geochemistry reveals the site-specific Al₂O₃ weight percentage of bauxite ore within the study area of Shevaroy Hill in Salem district.

 

Author (s) Details

 Aravindan.S
Department of Earth Sciences, Annamalai University, Annamalai Nagar – 608 002, India.

 

Sanjay Kumar Balabantaray
Department of Earth Sciences, Annamalai University, Annamalai Nagar – 608 002, India.

 

Bharathiraja. S
Department of Earth Sciences, Annamalai University, Annamalai Nagar – 608 002, India.

 

Please see the book here:- https://doi.org/10.9734/bpi/geserh/v10/5439

Mechanical Characteristics of Sand Mortar (Cinder Blocks) and Compressed Laterite Bricks (BTC) Stabilized with Cement: A Comparative Study | Chapter 1 | New Visions in Science and Technology Vol. 3

The purpose of this study is to assess the dry and wet mechanical resistances of 1520x40 cm3 sand mortar (cinder blocks) and 101428 cm3 compressed laterite mortar bricks (BTC) stabilised with cement after immersion in water. According to the experimental results, the 28-day compressive strength values of the 12 percent cinder blocks and the 10 percent cement BTCs are 2.55 MPa and 7.90 MPa, respectively. These values are consistent with the normative criteria of the Building Materials Centre (CMC) in N'Djamena (2.4MPa) and the Land Materials Research Centre (CRAterre) (5MPa). When exposed to moisture, BTC loses only 28% of its tensile strength, whereas cinder blocks lose 46%. BTC has a suction capacity of 2.50 to 5.02 g/cm2 S(1/2), while cinder blocks have a suction capacity of 6.12 to 10.90 g/cm2.S(1/2). All of these values are below than the limit given by NF P 554, which is 20 g/cm2.S(1/2). The findings show that, when using the same cement composition, BTCs are more durable and cost-effective than cinder blocks in both dry and rainy seasons. In summary, this research has demonstrated, on the one hand, the disparity in qualities that exists between sand and laterite materials through the use of a stabiliser, cement, and, on the other hand, the benefit of employing local resources.

Author (S) Details

Bozabe Renonet Karka

National Superior School of Public Works (ENSTP) of N'Djamena,Chad.

Kinet Ouinra

Civil Engineering Laboratory of the National Superior School of Public Works (ENSTP), N’Djamena, Chad.

Tomtebaye Ngakoutou Fulbert

Civil Engineering Laboratory of the National Superior School of Public Works (ENSTP), N’Djamena, Chad.

View Book :- https://stm.bookpi.org/NVST-V3/article/view/3722