Browsing by Author "Nadaf, Firoz"

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    Analysis of high rise building with soft storey heights and approaching methodology
    (AIKTC, 2021-05) Nadaf, Firoz; Jahagirdar, Sayyeda Zara; Sawaid, Anjum (15CE37); Ansari, Shadab (15CE11); Shaikh, Faisal (15CE45); Shasudeen, Sajid (15CE35)
    Earthquakes are natural hazards under which clisasters are mainJy caused by damage or collapse of buildings and other man-made sn-uctures. Due to accommodation of vehicles and their movements at ground levels infill walls are generaUy avoided. which creates soft storey effect. It should be noled that 70 to 80 % of buildings of urban areas in India fall under the classification of soft storey. This soft storey is also called as Open ground storey or Weak storey. It is a typical feature in the modem multi-storey constructions. Such features are highJy undesirable in buildings built in ei micaJly active areas; this ha been verified in numerou experiences of strong shaking during the past earthquakes. The majority of building that failed during the Bhuj earthquake (200 I) and Gujarat earthquake were of the open ground storey type. The collapse mechanism of such type of building is predominantly due to the formation of soft-storey. As per Indian Standard JS 1893: 2002, the Columns and Beams of the open ground storey are lo be designed for 2.5 time the torey hears and moments calculated under eismic load of bare frame . This Multiplication Factor value however does not account for number of storeys, number of bay • type and number of infill walls present, etc, and hence it is independent of all of the above factors. The multiplication factor of 2.5 is not reaJistic for low rise buildings. This calls for an assessment and review of the code recommended multiplication factor for low ri e open ground storey builcling . Therefore, the objective of this tudy i defined as to check the applicability of the multiplication factor of 2.5. This study includes analysis of (G+7) RCC Framed building analysed u ing Seismic Coefficient Method (SCM) as per IS 1893: 2002. Io modelling the masonry in.fiJJ panels, Equivalent diagonal Strut method is used. This study basicaJJy includes Four models namely, Frame without masonary infill effect (Bare frame). Masonary lnfill frame, Frame with Tie-beam (Tie-beamed frame) and Frame with Bracing. (Braced frame) which are analy ed for Soil type I (Hard) and Soil type Ill (Soft) considering time period for seismic analysis as per Program calculated and as per Coda! provision. The response of columns in Open ground storey are discussed and conclusions are made in this study analysed on ETABS software.
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    Assessment of Feasibility of Sintered Fly Ash Lightweight Aggregate as an Effective Self-Curing Additive for Sustainable Concreting Practice
    (E3S Web of Conferences, 2024-11-22) Patil, Dada S.; Nadaf, Firoz; Parkar, Fauwaz
    Effective curing is an essential requirement for a desired long-term performance of concrete. For 1 cubic metre of hardened concrete, 3 cubic metre of water is required; most of which is consumed for curing, thereby leading to an unsustainable practice. Limited depth of water penetration occurs in conventional method of external curing. Self-Curing (SCu), also known as Internal Curing facilitates uniform moisture distribution throughout the concrete. Moreover, enormous amount of curing water can be saved for a sustainable development. This is achieved by incorporating prewetted porous lightweight aggregates (LWAs); water held in LWA pores is gradually desorbed in to surrounding matrix over a period of time for an effective Self-Curing by maintaining sufficient moisture inside the concrete mass. Different types of LWAs are used for this purpose. The available literature indicates that sintered fly ash LWAs are used to produce non-structural and structural lightweight concrete; but their utilization for internal curing is not found. In this experimental work, feasibility of 4 to 8 mm spherical sintered fly ash LWA to act as an effective Self-Curing agent was assessed through various tests. Scanning Electron Microscopy revealed that LWAs were porous enough to hold sufficient amount of water. Higher specific gravity as compared to that of other types of LWAs made it desirable material from strength and density point of view. Higher water absorption rate within initial 30 minutes reflected it’s better desorption behaviour; highly desirable for an effective internal curing. Oven-dried LWAs were immersed in blue ink for 24 hours and then placed in a white cement paste. The thick blue ink corona around LWA confirmed about better desorption. This is not true of every type of LWA. Cement-sand mortar cubes were cast by volumetrically replacing sand by 10%, 15% and 20% prewetted LWAs for compressive strength tests at 3, 7 and 28 days. Prewetting was done for 24 hours and 72 hours. Conventional mortar cubes were placed under water; prewetted LWA-incorporated specimens were placed inside laboratory in an open air and directly under the sun. Conventional specimens exhibited highest strength values. Among Self-Curing specimens, 15% LWA cubes indicated maximum compressive strength; marginally less than that of water- cured cubes. 72-hour prewetted LWA cubes resulted in higher strengths as compared to that of 24 hour prewetted LWA cubes. Ultrasonic Pulse Velocity values for all the specimens were between 3.16 to 3.68 km/sec. The experimental results indicated that sintered fly ash LWA can be used as a potential material to produce Self-Curing concrete. Key words: Self-Curing / desorption / sintered fly ash LWAs / mortar cubes / sustainable practice / water absorption / sufficient moisture / open air / sun / etc
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    Comparative study of flat slab structure
    (AIKTC, 2018-05) Nadaf, Firoz; Aware, Saad Aslam (15DCE60); Dhamaskar, Hasib Zahoor (15DCE61); Savardekar, Sultan Ismail (15DCE70); Ansari, Bilal Mohd. Azharuddin (13CE07)
    sIn the present era, flat slab buildings are commonly used for construction as it has many advantages over conventional slab buildings in terms of architectural flexibility, use of space, easier formwork and shorter construction time. As due to this old traditional construction net height of room is reduced. Hence to improve aesthetical and structural aspect of multi storey, shopping mall ,offices, warehouses , public community hall, hospitals etc. are constructed in such a way were slab are directly on columns. This types of slab directly supported on column is termed as flat slab. According to BIS Guidelines IS 1893-2002 says the storey drift in any storey due to minimum specified design lateral force, with partial load factor of 1.0 shall not exceed 0.004 times the storey height and the revised IS 1893-2016 recommends to put limitation prescribes (a) Punching shear failure should be avoided and (b) the lateral drift at the roof under design lateral force shall not excees 0.1 per cent. The main objective of the present work is to compare the storey drift with previous IS 1893-2002 by the revised IS 1893-2016. Accordingly; we can state whether the structure can withstand without any failure or not.
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    Fire safey evaluation of residential building
    (AIKTC, 2021-05) Nadaf, Firoz; Labbai, Abdul Hakeem (16CE21); Ansari, Mohd Umair Mohd Mazher (17CE13); Khan, Abrar Ahmed Nasir Ahmed (16CE15); Sayyed, Ameenuddin Alauddin (17DCE69)
    Increasing demands of the new millennium for sustainable and durable structures, and the limited available resources, have awakened the need for safety of the building. Safety factor of the buildings are depending upon the importance factor of the buildings. The more the importance factor the more safety factor. One such safety factor i.e., fire safety is totally of neglectful in most of the residential building and become a threat and danger to the occupants if accidentally building catches fire. One has to see the capability of existing building to fight with fire. One also has to see construction of the building has followed the standard with respect to fire safety by doing fire safety audit. For the present work one residential building has been selected. Fire safety audit list were prepared by referring IS codes. Due to pandemic permission was not granted to do fire safety audit. Keywords: Fire Safety Audit.
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    Research on mechanical properties of geo polymer concrete
    (AIKTC, 2018-05) Nadaf, Firoz; Shaikh, Maaz T (13Ce52); Murumkar, Nabil Y (14CE41); Pathan, Huzaif N (14CE46); Siddiqui, Fahad A (14CE59)
    Increase in emission of carbon dioxide due to different industrial and non-industrial activities are causing a serious threat to environment. Cement being one of the major contributors in carbon dioxide emissions there is greater need felt throughout the world to reduce carbon dioxide emissions through cement manufacture. Industrial by-products like GGBS, fly ash and rice husk have a serious problems in waste disposal which affects economy of country. Geo-polymer concrete is a solution to this problem. Geopolymer is a class of aluminosilicate binding material synthesized by thermal activation of GGBS and fly ash. Geopolymer is produced due to alkalination of materials rich in aluminium and silicon with alkali solution, an aqueous solution of sodium hydroxide and sodium silicate. Alkali solution with 16M molar concentration was prepared with hydroxide to silicate ratio as 2.5.Different samples were casted with 50% GGBS, 25% PFA and 25% metakaolin. All the specimens were cured at 60 degree calcium in accelerated curing tank for 3 days. It was observed that geo-polymer concrete gives higher strength as compared to normal concrete.