The Effect of Different Binder to Aggregate Ratios Towards 3D Concrete Printing Using Tailing as Fine Aggregate Replacement

Fedyandi, Rifandi Yahya (2025) The Effect of Different Binder to Aggregate Ratios Towards 3D Concrete Printing Using Tailing as Fine Aggregate Replacement. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

3D Concrete Printing (3DCP) is a method of construction using a computer-aided program to extrude concrete by using an extruder and can be done by adding layer-by-layer concrete mortar to obtain a more flexible result than the conventional concrete. Since it is done by computer, more shapes and forms can be built instead of just bricks or cylinder for normal concrete. There are three essential factors to be able to produce a suitable concrete mix for 3DCP, which are flowability, extrudability, and buildability. Flowability uses mini slump and slump flow tests to look for the optimal composition. For extrudability, there are Shape Retention Factor (SRF) and open time test to meet the requirement. For buildability, the test consists of a green strength test which is implemented from split tensile strength test of conventional concrete. The 3D printer used will be a mini 3D printer with dimensions of 1 x 1 x 1 m. The specimen prototype model will be a cylindrical tower with as many layers as the printer can extrude using 5 kg weight based on the mix design. All the testing done during this research will be referenced based on ASTM standards. This study aimed to lower the b/a (b/a) ratio while simultaneously addressing the concerns regarding the cost and environmental impact of cement. By doing this, it was possible to reduce the expenses related to the usage of cement while simultaneously lessening its impact on the environment. This strategy was in line with the building industry's increasing focus on sustainability. Additionally, creative substitutes for conventional cement-based materials could be investigated by optimizing the b/a ratio, opening the door to more economical and environmentally friendly options. After meeting all the requirements, the mortar was next tested to find its characteristics, such as the compressive strength, split tensile strength test, setting time test, and shrinkage test which all were also based on ASTM standards. For compressive and split tensile strength, the same age of mortar and specimen type will be used, which were for <12 hours, 12-hour, 1 day, 7 days, and 28 days and a specimen of 50 x 100 mm cylinder. Setting time tests will be conducted using a penetrometer to obtain the mortar’s initial setting time and final setting time, which is the time period when the mortar starts to harden and finally fully hardened. For shrinkage test, it would be carried on for fourteen days. Studies regarding 3DCP in Indonesia is still scarce. Most of the research was found from overseas researchers. Thus, the aim for this research was to emphasize 3DCP using local materials, which was tailing. Tailing is a by-product of a mining activities done throughout the island of Papua, Indonesia. By using tailing, environmental issues could be minimized by using the tailing that was piled up throughout Papua’s mining site.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	3D Concrete Printing, Tailing, Flowability, Extrudability, Buildability
Subjects:	T Technology > T Technology (General) T Technology > TA Engineering (General). Civil engineering (General) > TA433 Strength of materials.
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Civil Engineering > 22201-(S1) Undergraduate Thesis
Depositing User:	Rifandi Yahya Fedyandi
Date Deposited:	05 Feb 2025 06:23
Last Modified:	05 Feb 2025 06:23
URI:	http://repository.its.ac.id/id/eprint/118107

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