http://nopr.niscpr.res.in/handle/123456789/58462 2026-10-10T17:47:07Z http://nopr.niscpr.res.in/handle/123456789/58474 Title: Influence of industrial by-products on the behavior of geopolymer concrete for sustainable development Authors: Gupta, Nakul; Kishore, Kamal; Saxena, Kuldeep Kumar; Joshi, Tilak C Abstract: Carbon dioxideemission in cement industries is a great concern for environment, which is increasing day by day. Therefore, it is very essential to find a possible material that can be used as a replacement of cement. Geopolymer concrete is a kind of inorganic concrete elucidating the formal usage of industrial and natural waste in either single or combined form. Geopolymers are amorphous covalently bonded by a 3D network of inorganic molecules of aluminosilicate material. The formation of geopolymer concrete is greatly influenced by several factors such as binder chemical reaction, curing temperature/period, molarity of the solution, and rate of polymerization. The curing temperature helps in deciding the properties of geopolymer. Performance variables for geopolymer concrete such as selection of alkaline binder with pozzolana (Fly ash, slag, silica fume etc.) and interrelationship of GPC, reinforcing agent in geopolymer concrete with components responsible for durability are summarized in detail. The durability of concrete is reviewed with structure with shrinkage-resistant, resistant to sulfate attack, and consequences of carbonation. The various consequences of corrosion are also summarized in last of present review paper. Different research findings in this paper proves successfully that geopolymer is better construction material as compare to cement-based concrete. Page(s): 433-445 2021-10-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/58473 Title: Nitinol shape memory alloy spring Authors: Nath, Tameshwer; Singh, Sunil Kumar Abstract: Manufacturing, over the years, has evolved through three revolutions brought out by the impact of mechanization, electricity and Information Technology. The update in manufacturing has its root of intelligence. Necessity of miniaturization is shifted the use of conventional actuators with smart actuators. Conventional actuators generally produce the power in proportion to their volume, which reduce their application in micro applications. A concise review of the recent developments within nearly ten years on shape memory alloys has been presented. Besides other available shape memory alloys, Nitinol(Ni-Ti) is preferred due to its array of characteristicslike light weight, high power to weight ratio, noiseless operation, ease of actuation and muscle like movement. Shape memory effect and pseudo-elasticity play a crucial role in smart materials. Various actuation modes (Joule heating, hot water, laser assisted) and cooling methods are tabulated for Ni-Ti. The different forms of Nitinolare commercially available, but spring is used specially, due to its coiled structure. Page(s): 446-453 2021-10-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/58472 Title: Integrated TOPSIS-PROMETHEE-MOORA model for material selection of crankcase cover Authors: Chawla, Sumit; Singari, Ranganath M Abstract: Material selection is an important task for designers in all industries. To satisfy customer needs, designers have to predict the performance of all available materials and find out the best material for the product. Since the various materials are available in the market with diverse characteristics, which makes the material selection process is complex. So, there is an indispensable need for a proper material selection methodology. The designers have to identify the best approach which enhanced the product performance and also reduced the time of designing. In this study, first-time selection of materials for two-wheeler crankcase cover has done using integrated TOPSIS (Technique for order preference by similarity to ideal solution) PROMETHEE (Preference ranking organization method for enrichment evaluation), and MOORA (Multi-objective optimization by ration analysis) model. The final rankings of alternatives obtained from this integrated model have also been compared with each other for finding the best material for crankcase cover. Six aluminum alloys (Alloy 360, Alloy 380, Alloy A380, Alloy 383, Alloy B390, and Alloy 13) have been taken as alternatives, and seven attributes (Brinell hardness, yield strength, % elongation, young’s modulus, ultimate tensile strength, fatigue strength, and material cost) have been taken as criteria for this study. Page(s): 454-461 2021-10-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/58471 Title: Thermal and acoustic performance of cement fibreboard and bamboo buildings Authors: Singh, Siddharth; Chourasia, Ajay; Bisht, Ravindra Singh; Yadav, Sameer Abstract: The present study evaluates the thermal and acoustic performance of building constructed from aerated concrete-cement fibreboards and bamboo composite. The thermal, humidity, ambient, and indoor temperature parameters are analyzed for a 24-hours cycle from April to May and December to January. The average temperature plot shows the maximum indoor temperature does not exceed 28-32 ºC for April to May and 12-16 ºC for December to January for both the buildings. Thermal admittance is observed as 7.3 W/m2K and 12 W/m2K for cement fibreboard and bamboo composite buildings respectively. Outdoor to indoor noise reduction (OINR) values at frequencies ranging from 80 Hz to 4000 Hz are noted and analysed. The maximum noise isolation provided by cement fibreboard and bamboo composite walls are found to be ~40 dBA and 35 dBA at 500 Hz. With proper ventilation and avoidance of direct sunlight in the room, a comfortable atmosphere can be achieved for these buildings Page(s): 462-471 2021-10-01T00:00:00Z