http://suspace.su.edu.bd/handle/123456789/2 2026-04-18T12:37:37Z http://suspace.su.edu.bd/handle/123456789/2460 Experiment Study On Influence Of Admixtures On Concrete Workability And Compressive Strength Ripon, Hossain Concrete is a mixture of cement, sand and stone chips in some specified proportion which is generally used for R.C.C and C.C. We have worked on a comparative study about the effect of membrane curing of concrete. Firstly, 36 concrete cylinders of 4 x 8 inch were made and twelve of them were cured continuously in the bathtub. Half of them 7days and rest of them for 28 days. Another twelve of the cylinders was covered with jute membrane like the local construction side and cured 2 hours to 3-hour intervals. Rest of them without any covering cured 2 hours to 3-hour intervals. Mixing and curing water is one of the components required, and it should be suitable for producing concrete. curing is essential if concrete is to perform the intended function over the design life of the structure while excessive curing time may lead to the escalation of the construction cost of the project unnecessary delays. The new tread of using high strength concrete in construction has caused a need for the use of 4 x 8 in. Cylinders for assurance testing. A controlling factor that affects the curing of specimen that can be tested in compression machine is the strength of the concrete on evaluation. In this study, it is observed that the 1.5% percentage admixture with 0.325 water cement ratio gave better compressive strength value (20.17 MPa) for 7 days test. and (25.98 MPa) for 28 days test. The study we can see that using admixture to increase the workability of concrete and reducing the water to cement ratio increases the compressive strength of concrete. 2025-06-11T00:00:00Z http://suspace.su.edu.bd/handle/123456789/2459 Seismic Performance Evaluation Of A (G+6) 7 Storied Flat Slab Residential Building For Savar Zone In Bangladesh Using ETABS According To BNBC 2020. MD., Alimul Haque 2025-05-11T00:00:00Z http://suspace.su.edu.bd/handle/123456789/2458 A COMPARATIVE STUDY ON THE COMPRESSIVE STRENGTH OF CONCRETE USING WASTE GLASS AS PARTIAL REPLACEMENT OF FINE AGGREGATE AND COARSE AGGREGATE MEHEDI, HASAN This thesis presents a comparative study on the compressive strength of concrete using waste glass as a partial replacement of fine aggregate and coarse aggregate. The main objective of the study is to evaluate the effectiveness of incorporating waste glass in concrete mixes, particularly its influence on compressive strength, and to examine its potential as an eco friendly and sustainable construction material. In this research, Indian Pakur stone was used as the coarse aggregate and Sylhet sand as the fine aggregate. Crushed waste glass was used as a partial replacement for both aggregates at four different replacement levels: 5%, 10%, 15%, and 20% by weight. The concrete was designed with an M20 mix ratio (1:1.5:3) and a constant water-cement ratio of 0.45. Cylindrical concrete specimens were cast and tested for compressive strength after 7 and 28 days of curing using a Universal Testing Machine (UTM) with a maximum capacity of 1000 kN, following ASTM standards. The results showed that the 7-day compressive strength did not exhibit a significant increase compared to the control mix. However, the 28-day compressive strength showed notable improvements. The best performance is seen at 10% and 15 % fine aggregate replacement and 5% and 20% coarse aggregate replacement at 28 days. This study demonstrates that waste glass can be effectively used in concrete as a partial replacement for both fine and coarse aggregates, contributing to the production of lightweight, strong and sustainable concrete. The findings support the potential for large-scale application of waste glass in the construction industry, aligning with global sustainability trends and reducing the environmental impact of glass waste. 2025-07-11T00:00:00Z http://suspace.su.edu.bd/handle/123456789/2457 Seismic Retrofitting of Existing RCC Buildings Using Hybrid Dampers: A Comparative Study on Cost Efficiency of Hybrid, FVD & TMD Systems Fatima, Karim Mouny This thesis presents a study on the effectiveness of different types of dampers in enhancing the seismic performance of an existing 10-story reinforced concrete building in Dhaka, Bangladesh, originally designed following BNBC 1993 provisions. A comparative analysis was conducted using Response Spectrum Analysis in ETABS to evaluate story displacement, inter-story drift, and base shear with and without the implementation of dampers. The results indicate that the incorporation of viscous, tune mass and hybrid dampers significantly reduces seismic responses, thereby improving overall building performance. The study highlights the importance of retrofitting old structures with modern energy dissipation devices as a cost-effective and reliable solution for seismic risk mitigation. This research provides valuable insights for structural engineers, researchers, and policymakers. The findings may support future strategies for improving earthquake resilience in Bangladesh and other seismic regions. 2025-07-11T00:00:00Z