Sumanth Bandaru | KAKATIYA INSTITUTE OF TECHNOLGY AND SCIENCE (original) (raw)

Uploads

Papers by Sumanth Bandaru

Research paper thumbnail of Study on fly ash and GGBS based geopolymer corbels

Materials Today: Proceedings

Research paper thumbnail of A Parameter to Assess the Strength of Fly Ash and GGBS-Based Geopolymer Concrete

Advances in Sustainable Materials and Resilient Infrastructure, 2022

When developing new-age building materials, "sustainability" and "energy efficiency" are key fact... more When developing new-age building materials, "sustainability" and "energy efficiency" are key factors. The long-term view is to reduce exposure through the use of unwanted industrial by-products, which reduces the consumption of natural materials. In this direction, geopolymers have emerged as environmentally friendly substitutes for Portland cement, which, in many areas, not only reduce greenhouse gas emissions but also consume large volumes of industrial waste such as fly ash, mine tailings and metallurgical slag. Geopolymer concrete (GPC) has recently been developed as an alternative to conventional Portland cement (OPC). GPC is produced by combining raw materials such as fly ash (FA), ground granular blast furnace slag (GGBS), which are rich in silicon (Si) and aluminum (Al), using highly alkaline liquids such as NaOH and/or sodium silicate solution (Na 2 SiO 3). These alkaline liquids act as an activator and produce the binder needed to make concrete without the use of cement. In the recent past, several studies Davidovits (1999), Palomo et al. (1999), Lloyd and Van Deventer (2005) and Rangan (2008) have reported various parameters affecting the strength of GPC. These parameters include the amount of source material, the ratio of the activator to the binder, the molarity of the activator solution. Published literature indicates that several variables influenced the strength of the GPC. The combined effect of various parameters on the strength of geopolymer concrete based on GGBS and fly ash was represented by the proposal of a parameter called "Binder Index (Bi)" Rama Seshu

Research paper thumbnail of SEISMIC EVALUATION OF EXISTING BUILDING & STRENGTHENING TECHNIQUES

— Recent earthquakes in the Indian subcontinent have led to an increase in the seismic zoning fac... more — Recent earthquakes in the Indian subcontinent have led to an increase in the seismic zoning factor over many parts of the country. Many existing buildings require a seismic assessment for various reasons, such as non-compliance with code requirements, code updates, poor design practices and changes in building usage. However, the existing insufficient structure can be upgraded with some rehabilitation to maintain the expected level of performance. This paper presents the seismic evaluation of the existing building of G+3 RCC structure subjected to Zone-II level earthquake forces. Building is modeled in 3D software. The existing structures are analyzed and designed as per IS 1893-1984, 1893-2002 and the design is compared as per two codal provisions also with the existing designed structural details. Retrofitting techniques are applied to the existing building for the non-compliance elements. To improve the performance of deficient members, a local retrofitting strategy is adopted. This study shows that the RCC jacketing is an efficient way to retrofit RC members to improve flexure as well as shear capacity.

Research paper thumbnail of Study on fly ash and GGBS based geopolymer corbels

Materials Today: Proceedings

Research paper thumbnail of A Parameter to Assess the Strength of Fly Ash and GGBS-Based Geopolymer Concrete

Advances in Sustainable Materials and Resilient Infrastructure, 2022

When developing new-age building materials, "sustainability" and "energy efficiency" are key fact... more When developing new-age building materials, "sustainability" and "energy efficiency" are key factors. The long-term view is to reduce exposure through the use of unwanted industrial by-products, which reduces the consumption of natural materials. In this direction, geopolymers have emerged as environmentally friendly substitutes for Portland cement, which, in many areas, not only reduce greenhouse gas emissions but also consume large volumes of industrial waste such as fly ash, mine tailings and metallurgical slag. Geopolymer concrete (GPC) has recently been developed as an alternative to conventional Portland cement (OPC). GPC is produced by combining raw materials such as fly ash (FA), ground granular blast furnace slag (GGBS), which are rich in silicon (Si) and aluminum (Al), using highly alkaline liquids such as NaOH and/or sodium silicate solution (Na 2 SiO 3). These alkaline liquids act as an activator and produce the binder needed to make concrete without the use of cement. In the recent past, several studies Davidovits (1999), Palomo et al. (1999), Lloyd and Van Deventer (2005) and Rangan (2008) have reported various parameters affecting the strength of GPC. These parameters include the amount of source material, the ratio of the activator to the binder, the molarity of the activator solution. Published literature indicates that several variables influenced the strength of the GPC. The combined effect of various parameters on the strength of geopolymer concrete based on GGBS and fly ash was represented by the proposal of a parameter called "Binder Index (Bi)" Rama Seshu

Research paper thumbnail of SEISMIC EVALUATION OF EXISTING BUILDING & STRENGTHENING TECHNIQUES

— Recent earthquakes in the Indian subcontinent have led to an increase in the seismic zoning fac... more — Recent earthquakes in the Indian subcontinent have led to an increase in the seismic zoning factor over many parts of the country. Many existing buildings require a seismic assessment for various reasons, such as non-compliance with code requirements, code updates, poor design practices and changes in building usage. However, the existing insufficient structure can be upgraded with some rehabilitation to maintain the expected level of performance. This paper presents the seismic evaluation of the existing building of G+3 RCC structure subjected to Zone-II level earthquake forces. Building is modeled in 3D software. The existing structures are analyzed and designed as per IS 1893-1984, 1893-2002 and the design is compared as per two codal provisions also with the existing designed structural details. Retrofitting techniques are applied to the existing building for the non-compliance elements. To improve the performance of deficient members, a local retrofitting strategy is adopted. This study shows that the RCC jacketing is an efficient way to retrofit RC members to improve flexure as well as shear capacity.