Suffian Abdul Karim (2022) Spent bleaching earth ash (SBEA) as silica fume replacement in ternary blended concrete. Universiti Malaysia Sabah. (Unpublished)
![[img]](https://eprints.ums.edu.my/style/images/fileicons/text.png) |
Text
24 PAGES.pdf Download (914kB) |
|
Text
FULLTEXT.pdf Restricted to Registered users only Download (2MB) |
Abstract
Spent Bleaching Earth Ash (SBEA) is a sustainable product recycled from spent bleaching earth (SBE). It is recently used as a blended cement. In particular, ternary blended concrete incorporating SBEA and silica fume was studied with different percentages of SBEA replacing silica fume in the mix design. The physical and chemical characteristics of SBEA, silica fume and cement were analyzed. The effect on engineering properties of partially substituting silica fume with SBEA in trinary blended concrete was also studied. Lastly, the optimum percentage replacement of SBEA used in the ternary blended concrete is done. The mix design was based on the JKR mix design standard for M30 grade concrete, which was then altered by replacing 13% cement with silica fume. Silica fume is then replaced with 20%, 40%, 60%, 80% and 100% with SBEA. Three major experiments were done to test this concrete's engineering properties: workability, compressive and density test. It was found that SBEA had almost similar fineness to cement powder, with a specific gravity of 1.97 for SBEA, 3.23 for silica fume and 3.17 for cement. SBEA consists mainly of silica (SiO2), and the value of SiO2, aluminium oxide (Al2O3), and iron oxide (Fe2O3) combination was 69.15% which is more than 50%. According to the ASTM C618 standard, SBEA could be categorized in the Class C pozzolan. The primary crystalline phase of SBEA was α-quartz, while x-ray diffraction (XRD) of silica fume was found to exhibit generally amorphous characteristics, and the primary crystalline phases of the cement powder were alite, belite, portlandite, and gypsum. Based on the micrograph image, SBEA possesses some relatively spherical, irregular-shaped, and agglomeration of its particles, silica fume particle is spherical and has a smooth surface area. Cement particles are observed to have an irregular shape and come in different sizes. The conventional cement was substituted with 13% silica fume by cement mass. The compressive strength of concrete containing different percentages of SBEA replacing silica fume was determined and found that the early curing age of concrete compressive strength was not affected by the replacement of SBEA but observed to take a turn in the late curing age, where 40% of SBEA replacement show the highest compressive strength, 70.02 MPa. The workability shows that an increase of SBEA percentages replacement illustrates better workability and density of all the mix designs is not far from each other, with S4 mix design being the highest. In short, the best design to be implemented in the construction industry is the S4 mix design with the highest compressive strength and acceptable workability and density. v
| Item Type: | Academic Exercise |
|---|---|
| Keyword: | Spent bleaching earth ash , SBEA , Cement , Silica fume , Concrete |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) > TA1-2040 Engineering (General). Civil engineering (General) > TA401-492 Materials of engineering and construction. Mechanics of materials |
| Department: | FACULTY > Faculty of Engineering |
| Depositing User: | DG MASNIAH AHMAD - |
| Date Deposited: | 23 Mar 2023 10:15 |
| Last Modified: | 23 Mar 2023 10:15 |
| URI: | https://eprints.ums.edu.my/id/eprint/35237 |
Actions (login required)
 |
View Item |