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RISS 인기검색어
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- 저자 : Gunneswara Rao, T.D. (검색결과 5 건)
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Effect of fly ash and GGBS combination on mechanical and durability properties of GPC
Mallikarjuna Rao, Goriparthi,Gunneswara Rao, T.D. Techno-Press 2017 Advances in concrete construction Vol.5 No.4
Geopolymer is a sustainable concrete, replaces traditional cement concrete using alternative sustainable construction materials as binders and alkaline solution as alkaline activator. This paper presents the strength characteristics of geopolymer concrete (GPC) developed with fly ash and GGBS as binders, combined Sodium silicate ($Na_2SiO_3$) and Sodium Hydroxide (NaOH) solution as alkaline activators. The parameters considered in this research work are proportions of fly ash and GGBS (70-30 and 50-50), curing conditions (Outdoor curing and oven curing at $600^{\circ}C$ for 24 hours), two grades of concrete (GPC20 and GPC50). The mechanical properties such as compressive strength, split tensile strength and flexural strength along with durability characteristics were determined. For studying the durability characteristics of geopolymer concrete 5% $H_2SO_4$ solutions was used and the specimens were immersed up to an exposure period of 56 days. The main parameters considered in this study were Acid Mass Loss Factor (AMLF), Acid Strength Loss Factor (ASLF) and products of degradation. The results conclude that GPC with sufficient strength can be developed even under Outdoor curing using fly ash and GGBS combination i.e., without the need for any heat curing.
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Mechanical and fracture properties of glass fiber reinforced geopolymer concrete
Midhuna, M.S.,Gunneswara Rao, T.D.,Chaitanya Srikrishna, T. Techno-Press 2018 Advances in concrete construction Vol.6 No.1
This paper investigates the effect of inclusion of glass fibers on mechanical and fracture properties of binary blend geopolymer concrete produced by using fly ash and ground granulated blast furnace slag. To study the effect of glass fibers, the mix design parameters like binder content, alkaline solution/binder ratio, sodium hydroxide concentration and aggregate grading were kept constant. Four different volume fractions (0.1%, 0.2%, 0.3% and 0.4%) and two different lengths (6 mm, 13 mm) of glass fibers were considered in the present study. Three different notch-depth ratios (0.1, 0.2, and 0.3) were considered for determining the fracture properties. The test results indicated that the addition of glass fibers improved the flexural strength, split tensile strength, fracture energy, critical stress intensity factor and critical crack mouth opening displacement of geopolymer concrete. 13 mm fibers are found to be more effective than 6 mm fibers and the optimum dosage of glass fibers was found to be 0.3% (by volume of concrete). The study shows the enormous potential of glass fiber reinforced geopolymer concrete in structural applications.
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Ravi Kumar Reddy, C.,Gunneswara Rao, T.D. Techno-Press 2011 Interaction and multiscale mechanics Vol.4 No.4
This paper presents the results of static vertical load tests carried out on a model building frame supported by pile groups embedded in cohesionless soil (sand). The effect of soil interaction on displacements and rotation at the column base and also the shears and bending moments in the columns of the building frame were investigated. The experimental results have been compared with those obtained from the finite element analysis and conventional method of analysis. Soil nonlinearity in the lateral direction is characterized by the p-y curves and in the axial direction by nonlinear vertical springs along the length of the piles (${\tau}-z$ curves) at their tips (Q-z curves). The results reveal that the conventional method gives the shear force in the column by about 40-60%, the bending moment at the column top about 20-30% and at the column base about 75-100% more than those from the experimental results. The response of the frame from the experimental results is in good agreement with that obtained by the nonlinear finite element analysis.
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Experimental and Analytical Study for Plastic Moment Capacity of Beam–Beam Splice Connection
V. Ramana Kollipara,T. D. Gunneswara Rao 한국강구조학회 2019 International Journal of Steel Structures Vol.19 No.4
In this paper, both experimental and analytical investigations are presented for the evaluation of yield moment capacity of the extended end plate connections under pure fl exural loading. Four point loading system is adopted to simulate the pure bending condition. For the experimental study a beam–beam splice connection is made by joining hollow tubular sections (HTS) using bolted end plate connections. The parameters varied for the experimental investigation are cross sectional dimensions of HTS, thickness of end plate, diameter of bolt and thickness of weld. In the analytical study, yield line theory is used for the prediction of yield moment equations of the connection for a particular modes of failure. Finally, the proposed analytical equations are validated by comparing the analytical results with the experimental results. It is found that the experimental results are in proximity with the analytical results.
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An Empirical Formula for Mode-II Fracture Energy of Concrete
Ch. Naga Satish Kumar,T. D. Gunneswara Rao 대한토목학회 2015 KSCE JOURNAL OF CIVIL ENGINEERING Vol.19 No.3
This paper presents an experimental investigation to understand the influence of Maximum Size of the Aggregate (MSA) andcompressive strength of concrete on the Mode-II fracture parameters (Fracture energy (GIIf) and Brittleness number) of normal and highstrength of concrete. An empirical formula for Mode-II fracture energy (GIIf) based on the Bazant’s size effect law is developed in termsof maximum size of aggregate and the compressive strength of concrete. A linear constitutive relationship between shear stress and slipi.e., the linear softening curve for Mode-II fracture of concrete is presented by conducting experiments on the double edge notchedspecimen. The experimental results indicated that increase in the grade of concrete (compressive strength) increases the brittleness of themember and Mode-II fracture energy and also increase in the maximum size of aggregate increases the Mode-II fracture energy.
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