http://dspace.cus.ac.in/jspui/handle/1/3893 2026-04-13T10:09:47Z http://dspace.cus.ac.in/jspui/handle/1/6523 Title: Green quaternary concrete composites: characterization and evaluation of the mechanical properties Authors: Dave, Niragi; Misra, Anil Kumar; Srivastava, Amit; Sharma, Anil Kumar; Kaushik, Surendra Kumar Abstract: Industrial byproducts such as fly ash (FA), silica fume (SF), ground granulated blast furnace slag (GGBS), metakaolin (MK), and lime powder (LP), popularly known as supplementary cementitious materials (SCMs), have been extensively used in the manufacturing of cement and cement products in binary and ternary modes. In the present study, attempt has been made to develop a new sustainable green quaternary binder by partially replacing ordinary Portland cement (OPC) with different percentages of SCMs and find the optimum mix that can provide the best results in terms of mechanical as well as durability properties. The motivation is to reduce our dependency on OPC to reduce carbon foot print and utilizing these industrial byproducts for the sustainable development. Different compositions of quaternary binders were prepared and their physical, mechanical, and durability properties were studied and compared with the OPC and binary cement product pozzolanic Portland cement (PPC). The mechanical properties of concrete prepared with these OPC, PPC, and quaternary binders were also studied and it is established that the concrete mixtures prepared with quaternary binders provided better results and proved to be more economical. It is concluded that quaternary binders (a) OPC70% + FA15% + SF7.5% + GGBS7.5%, (b) OPC70% + FA15% + SF7.5% + MK7.5%, (c) 50%OPC + 30%FA + 10%SF + 10%GGBS, and (d) 50%OPC + 30%FA + 10%SF + 10%MK have produced relatively better strength, improved durability, and resistance to sulfate attack. These findings were also supported with the microstructural studies of hardened concrete of M20 grade using scanning electron microscope (SEM) and X‐ray diffraction (XRD). 2018-01-01T00:00:00Z http://dspace.cus.ac.in/jspui/handle/1/6411 Title: Geochemistry and petrogenesis of Proterozoic granitic rocks from northern margin of the Chotanagpur Gneissic Complex (CGC) Authors: Yadav, Bhupendra S; Wanjari, Nishchal; Ahmad, Talat; Chaturvedi, Rajesh Abstract: This study presents the geochemical characteristics of granitic rocks located on the northern margin of Chotanagpur Gneissic Complex (CGC), exposed in parts of Gaya district, Bihar and discusses the possible petrogenetic process and source characteristics. These granites are associated with Barabar Anorthosite Complex and Neo-proterozoic Munger–Rajgir group of rocks. The granitic litho-units identified in the field are grey, pink and porphyritic granites. On the basis of geochemical and petrographic characteristics, the grey and pink granites were grouped together as GPG while the porphyritic granites were named as PG. Both GPG and PG are enriched in SiO2, K2O, Na2O, REE (except Eu), Rb, Ba, HFSE (Nb, Y, Zr), depleted in MgO, CaO, Sr and are characterised by high Fe* values, Ga/Al ratios and high Zr saturation temperatures (GPGavg∼ 861 ∘C and PGavg∼ 835 ∘C). The REE patterns for GPG are moderately fractionated with an average (La/Yb)N∼ 4.55 and Eu/Eu* ∼ 0.58, than PG which are strongly fractionated with an average (La/Yb)N∼ 31.86 and Eu/Eu* ∼ 0.75. These features indicate that the granites have an A-type character. On the basis of geochemical data, we conclude that the granites are probably derived from a predominant crustal source with variable mantle involvement in a post-collisional setting. 2016-01-01T00:00:00Z http://dspace.cus.ac.in/jspui/handle/1/6410 Title: Mercury enrichments and Hg isotopes in Cretaceouse-Paleogene boundary successions: links to volcanism and palaeoenvironmental impacts Authors: Sial, A.N.; Chen, Jiubin; Lacerda, L.D.; Frei, R.; Tewari, V.C.; Pandit, M.K.; Gaucher, C.; Ferreira, V.P.; Cirilli, S.; Peralta, S.; Korte, C.; Barbosa, J.A.; Pereira, N.S. 2016-01-01T00:00:00Z http://dspace.cus.ac.in/jspui/handle/1/4160 Title: Ooids in the Shali Belt. Himachal Himalaya Authors: Tewari, V.C. 1984-01-01T00:00:00Z