http://ir.bdu.edu.et/handle/123456789/10257 Sat, 13 Jan 2001 05:49:24 GMT 2001-01-13T05:49:24Z http://ir.bdu.edu.et/handle/123456789/16606 STUDY ON THE EFFECT OF PARTIAL REPLACEMENT OF CEMENT BY BREWERIES DRY GRAIN (SORGHUM) ASH IN MORTAR PROPERTY TAMRAT, ASSEFA LEMLEMU Cement manufacturing is indeed associated with several significant challenges such as energy intensity, greenhouse gas emissions, and is costly. To address these challenges, the construction industry seeks sustainable alternatives. This study explores the potential use of Breweries Dry Grain Ash (BDGA) as a partial replacement for ordinary Portland cement (OPC) in mortar production. Various mixtures were prepared with different proportions of BDGA (0%, 5%, 10%, 15% and 20%) while maintaining a constant water-to-cement ratio. By utilizing a combination of TGA and DTA, the study aims to provide a comprehensive understanding of BDGA’s potential as a sustainable additive in mortar production. These techniques allow me to delve into the physical, chemical, thermal, and micro structural aspects of mortar mixes containing BDGA, thereby evaluating its suitability in terms of performance, sustainability, and economic feasibility compared to conventional OPC-based mortars. BDGA exhibited pozzolanic properties and had a porous surface with irregular and angular edges. The results showed that the workability and setting time decreased and quantity of water required for attaining normal consistency increased as the BDGA content increased. The compressive strength of the mortar increased by for 14.5% with 10% BDGA and 5.6% with 5% BDGA compared to the control mix. BDGA5 and BDGA10 significantly improved the compressive strength, bulk density, and ultrasonic pulse velocity, especially in older mortars. Micro structural analysis revealed high density in BDGA5 and BDGA10 mixtures. Additionally, the thermal stability of BDGA increased with higher replacement percentages, and showed little loss of mass due to increasing temperature. Key Words: Brewiers dry grain ash; Supplementary Cementitious Materials; Fresh Properties; Mechanical Properties; Mortar Sat, 01 Jun 2024 00:00:00 GMT http://ir.bdu.edu.et/handle/123456789/16606 2024-06-01T00:00:00Z http://ir.bdu.edu.et/handle/123456789/16605 Experimental Study on Red teff straw ash for Partial Cement Substitution in Mortar production Samuel, Kuayaw Tadesse Currently the rapid population growth in the world has highly aggravated the need for private houses and large infrastructure installation all over the world that tremendously needs the consumption of cement. But the production of Cement is a very high energy-consumptive, environmental unfriendly and consumer of nonrenewable natural resources. Due to its sever impact on environment, cost and energy intensive approach, many studies are in search of getting locally available alternative materials that can reduce cement cost and along with its pollution effect. Taking in to account his study aimed to investigate the partial replacement of cement with Red teff straw ash (RTSA) in cement mortar at 0%, 5%, 10%, 15%, and 20% by weight of cement. The study also investigated the fresh properties of mortar (setting time and workability), physical test for cement and sand, chemical composition of RTSA, mechanical (compressive strength) at 3, 7 and 28 days, ultrasonic pulse velocity (UPV) at 28 and 56 days, durability (sulfate attack, water absorption and porosity) at 28 and 56days, and microstructural property, Fourier transform infrared (FT-IR), Thermogravimetric thermal analysis (TGA) at 7 days and 28 days were conducted and Scanning electron microscope (SEM) analysis at 28 days was conducted. The results revealed both mechanical, durability and microstructural properties of mortar were enhanced at 10% replacement of red teff straw ash when compared to control (0%) mix .But beyond 10% replacement has shown a slight reduction as compared to the control mix where as the workability of mortar decreases with an increasing percentage of replacement due to the high surface area of RTSA. Consequently, uniform and denser morphology was formed, and both durability and micro structure were enhanced at 10% RTSA replacement because of C-S-H increased by consuming calcium hydroxide and decreasing voids in cement grains. Thus, it is recommended that the utilization of agricultural wastes such as RTSA as supplementary cementitious material in mortar production should be encouraged. The statistical significance of durability properties of mortar based on their experimental test results are analyzed by simple linear model and general linear model (MANOVA) with the help of IBM SPSS and origin proV2018. Keywords- Red teff straw ash, Cement, mortar, Compressive Strength, Microstructure and durability Fri, 01 Nov 2024 00:00:00 GMT http://ir.bdu.edu.et/handle/123456789/16605 2024-11-01T00:00:00Z http://ir.bdu.edu.et/handle/123456789/16604 Experimental Analysis on Cement Mortar Incorporating Waste Marble Powder and Wheat Straw Ash as Partial Cement Saleamlak, Gedefaw Dires Global governments and industries are working to combat climate change caused by greenhouse gas emissions from cement production, which accounts for about 7% of global CO2 emissions. This research aims to reduce environmental contamination by using alternative materials in cement. Specifically, waste marble powder (WMP) and wheat straw ash (WSA) tested as substitutes in mortar production. Trial compressive strength tests identified a 1:2 ratio as optimal for combining WMP and WSA. Five mixtures designed: one control without replacements and four with 5%, 10%, 15%, and 20% cement replacement by weight, maintaining a constant w/c ratio of 0.53. A comprehensive experimental analysis evaluated the fresh (workability), hardened, and microstructural properties of the mortars. Mechanical properties (compressive strength) and durability (porosity, water absorption, and ultrasonic pulse velocity) investigated at 3, 7, 28, and 56 days of curing. Additionally, FTIR and SEM analyses conducted for the 0%, 10%, and 20% replacement mixtures at 56 days of curing age, while DTA and TGA properties examined at 7 and 56 days of curing age. The result shows that adding waste marble powder and wheat straw ash to mortar decreased workability but increased compressive strength, with the best results at 10% replacement. The results showed that incorporating waste marble powder and wheat straw ash improved the mortar's durability. SEM analysis revealed a dense microstructure in the WMPSA 10 mix, while DTA and TGA results indicated greater thermal stability compared to the control mortar. The correlation of mortar properties shows a positive relationship between compressive strength with UPV and porosity with water absorption, while UPV has a negative correlation with porosity. It is recommended to replace up to 15% of the cement on mortar with waste marble powder and wheat straw ash. Keywords: Waste Marble Powder, Wheat Straw Ash, Cement Mortar, Durability, Microstructure Sun, 01 Sep 2024 00:00:00 GMT http://ir.bdu.edu.et/handle/123456789/16604 2024-09-01T00:00:00Z http://ir.bdu.edu.et/handle/123456789/16603 INVESTIGATION OF PARTIAL REPLACEMENT OF CEMENT WITH EGGSHELL ASH AND GRANITE WASTE POWDER IN CEMENT MORTAR PRODUCTION Mehariw, Zewdie Muche Utilizing waste materials in construction is a creative way to promote sustainability as the need for building materials continues to rise due to infrastructure growth. Cement is a commonly used material globally, and contributes to environmental problems solving through the use of nonrenewable resources and CO2 emissions. Using waste materials as a partial or full replacement, such as eggshell ash and granite waste powder can be reprocessed and utilized as a partial replacement for cement in mortar production. This study aimed to investigate the effect of partial replacement of cement with eggshell ash and granite waste powder in cement mortar at 0, 5, 10, 15, 20, 25, and 30% by weight of cement as per ASTM C109. To accomplish the objective of this finding a detailed experimental analysis was performed to evaluate the fresh, hardening, and microstructural properties of mortar. The workability of fresh mortar, compressive strength, bulk density, water absorption, porosity test, ultrasonic pulse velocity, and sulfate attack, tests are conducted for different curing ages (3, 7, 28, 56, and 91) days. The result of BET demonstrates that eggshell ash and granite waste powder are very fine materials. Also, the chemical properties of ESAGWP meet the relevant ASTM C618 standard. The finding of the research indicates that using ESAGWP at 15% replacement gives the maximum compressive strength, bulk density, and UPV have all been enhanced, particularly in the later age of mortars. However, when using 20%, 25%, or 30% replacement, there's a small decrease in strength compared to the control mix. The workability of the mortar also decreases as the replacement percentage increases because ESA&GWP has a high surface area and requires high water demand. Furthermore, the samples showed a reduction in porosity, and water absorption capacity as the replacement percentage increased up to ESA&GWP 15% replacement after 15% replacement there is a slight increment of porosity and water absorption. The microstructure of the finding reveals that the 15% replacement of the ESAGWP mix is particularly dense and structural compactness. Thus, the study recommended that the utilization of eggshell ash and granite waste powder (ESAGWP) as a supplementary cementitious material in mortar production should be encouraged. Keywords: Durability, Eggshell Ash, Fresh Mortar Properties, Granite Waste Powder, Mechanical Properties, Microstructure Tue, 01 Oct 2024 00:00:00 GMT http://ir.bdu.edu.et/handle/123456789/16603 2024-10-01T00:00:00Z