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Panda K.C.,ITER | Bhattacharyya S.K.,Central Building Research Institute | Barai S.V.,Indian Institute of Technology Kharagpur
Construction and Building Materials

The focus of the present paper is on the study of the effect of transverse steel on the performance against shear and modes of failure of simply supported reinforced concrete (RC) T-beams strengthened in shear zone with glass fiber reinforced polymer (GFRP) sheet. Eighteen RC T-beams of 2.5 m span with and without transverse steel reinforcement are cast at the structural laboratory of IIT Kharagpur. Nine beams are used as control beam specimens in three different stirrups spacing such as without stirrups and with stirrups at 200 mm and 300 mm spacing and rest nine beams are strengthened in shear zone with GFRP sheet in U-jacket, side bonded and U-jacket with anchorage in each type of stirrups spacing. All the beams are tested in 300 Ton Universal Testing Machine (UTM). The test result clearly demonstrates the GFRP sheet in U-jacket with anchorage is much more effective than the U-jacket scheme. © 2012 Published by Elsevier Ltd. All rights reserved. Source

Singh M.,Central Building Research Institute
Indian Concrete Journal

The characterization of ground granulated blast furnace slag, fluorogypsum anhydrite and cement clinker used for formulating the super-sulphated cement (SSC) is discussed. It shows that about 65 to 75 % of granulated slag can be blended with 20% of anhydrite and 10 to 15% cement clinker to form super-sulphated cement. The strength development in the super-sulphated cement is attributed to the formation of ettringite, CSH and dicalcium hydrate. The initial strength development in SSC is due to the formation of tricalcium sulphoaluminate and C-S-H whereas the later age strength is attributed to the formation of calcium silicate hydrate (C-S-H ). The power consumption for grinding slag is considerably higher than that for cement clinker. Additional power is also required in various operations such as winning, crushing, grinding of raw materials and running of rotary kiln in the manufacture of cement clinker. The heat of hydration determined at 7 and 28 days of SSC comply with the requirements specified by the Indian standard specification IS 6909. Source

Gupta V.K.,Indian Institute of Technology Roorkee | Sethi B.,P.A. College | Upadhyay N.,Lovely Professional University | Kumar S.,P.A. College | And 2 more authors.
International Journal of Electrochemical Science

The construction, performance characteristics and application of a novel iron(III) membrane sensor based on a new S-methyl N-(methylcarbamoyloxy) thioacetimidate are reported in this paper. The designed sensor exhibited a wide linear response with a slope of 21.2 mV per decade over the concentration range of 9.1x10-6-1.0x10-1 M. The potentiometric response is independent on the pH of the solution in the range of 3.2-4.8. The electrode shows a response time of 20 s. The proposed electrode can be used for at least two months without any considerable divergence in potentials. It exhibits very good selectivity relative to a wide variety of alkali, alkaline earth, transition and heavy metal ions. The developed sensor was used for the quantitative determination of Fe(III) in tap and mineral water samples. The electrode assembly was also used as an indicator electrode in the potentiometric titration of Fe3+ with EDTA. © 2011 by ESG. Source

Thapliyal P.C.,Central Building Research Institute
Composite Interfaces

Interpenetrating polymer networks (IPNs) are a new class of polymer blends in network form in which at least one component is polymerized and/or cross-linked in the immediate presence of the other. IPNs possess several interesting characteristics in comparison to normal polyblends, because the varied synthetic techniques yield IPNs of such diverse properties that their engineering potential spans a broad gamut of modern technology. Interpenetrating polymer networks have shown excellent chemical resistance, hardness, elongation, tensile strength properties and higher compatibility. Hence, it can be concluded that using the IPN concept, it is possible to design the most desirable material for a specific end use requirement. © 2010 Koninklijke Brill NV, Leiden. Source

Panigrahi S.K.,Indian Institute of Technology Kharagpur | Deb A.,Indian Institute of Technology Kharagpur | Bhattacharyya S.K.,Indian Institute of Technology Kharagpur | Bhattacharyya S.K.,Central Building Research Institute
Journal of Composites for Construction

The effect of laminate thickness on crack pattern, mode of failure, and strength of shear deficient reinforced concrete (RC) T-beams wrapped with glass fiber reinforced polymer (GFRP) laminates was studied experimentally and numerically. Eight specimens of 2.5 m span, designed to fail in shear, were tested for two point static loading. Displacements, strains, and crack pattern were monitored. The strength and mode of failure were found to depend on the crack pattern. For U wraps, increasing the fiber reinforced polymer (FRP) laminate thickness resulted in reduced web cracking and increased cracking near the free edge of the laminate. © 2015 American Society of Civil Engineers. Source

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