Risdianto, Virgin (2023) Penyelidikan Pengaruh Penambahan Chemical Admixture Terhadap Karakteristik Mekanik Mortar High Volume Fly Ash (HVFA) Sebagai Material 3 Printing. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Inovasi mortar cetak 3D saat ini telah menjadi fokus perkembangan teknologi dalam pembuatan beton. Teknologi yang digunakan adalah D-Shape 3D printing Concrete. Tantangan utama dalam membuat bahan untuk pencetakan 3D adalah kemampuannya memenuhi setiap fase pencetakan 3D. Fase-fase ini adalah pumpability, open time, extrudability dan buildability. Inovasi mengenai mortar High Volume Fly ash (HVFA) memanfaatkan limbah fly ash sebagai material utama pembuatan mortar cetak 3D. Penggunaan HVFA memiliki kelemahan waktu pengerasan yang lama serta kuat tekan awal yang rendah (fase fresh mortar dan pengerasan), sedangkan kedua hal tersebut merupakan hal yang berhubungan dengan parameter utama dalam proses pengerjaan mortar sebagai material 3D printing. Oleh karena itu, dilakukan penambahan chemical admixture kalsium klorida (CaCl2) sebagai accelerator dan Sulfonate Naphtalene Formaldehyde (SNF) sebagai superplasticizer untuk mengatasi kelemahan tersebut. Pumpability, open time, extrudability dan buildability diketahui melalui beberapa pengujian laboratorium yang meliputi uji flowability, slump, shape retention factor (SRF), direct shear, serta simulasi printing sederhana menggunakan alat caulking gun mortar. Selain itu, dilakukan pengujian tekan kuat pada sampel mortar berbentuk kubus ukuran 50x50x50 mm3. Pengujian kuat tekan dilakukan pada umur 1; 28 dan 56 hari. Hasil pengujian flowability dan slump menunjukkan penurunan nilai terhadap waktu pengujiannya. Sedangkan dalam pendekatan pengujian rheology dengan menggunakan direct shear dan slump, nilai kohesi, tegangan geser dan tegangan leleh meningkat seiring dengan waktu pengujiannya. Kejadian ini mengindikasikan bahwa mortar yang diuji setelah fase diamnya akan mengalami pengerasan. Kecepatan mortar untuk mengeras yang ditunjukkan oleh nilai kohesi, tegangan geser dan tegangan leleh dipengaruhi oleh penambahan CaCl2 dan SNF pada campuran. Mix dengan proporsi penambahan admixture CaCl2 dan SNF beturut-turut sebesar 1% dan 0,5% (MC1-S0,5) memiliki penurunan flowability dan slump, peningkatan tegangan leleh, SRF, kohesi serta uji coba ekstrusi dan buildability secara laboratorium dan simulasi yang memenuhi parameter percetakan 3D printing concrete dengan menggunakan mesin tipe D-Shape. Oleh karena itu MC1-S0,5 memiliki sifat thixotropy yang mendukung kondisi fase segar (open time, pumpability, extrudability) dan fase pengerasan (buildability) dengan tekan kuat pada umur 28 hari sebesar 50,15 MPa. Kuat tekan yang dicapai menentukan implementasi mortar yaitu sebagai material struktural interior bangunan
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The 3D printed mortar innovation has now become the focus of technological developments in the manufacture of concrete. The technology used is D-Shape 3D printing Concrete. The main challenge in creating materials for 3D printing is their ability to fulfill each phase of 3D printing. These phases are pumpability, open time, extrudability and buildability. Innovation regarding High Volume Fly ash (HVFA) mortar utilizes fly ash waste as the main material for making 3D printed mortar. The use of HVFA has the disadvantages of a long setting time and low initial compressive strength (fresh mortar and hardening phases), while these two things are related to the main parameters in the mortar processing process as a 3D printing material. Therefore, the addition of chemical admixture calcium chloride (CaCl2) as an accelerator and Sulfonate Naphthalene Formaldehyde (SNF) as a superplasticizer to overcome these weaknesses. Pumpability, open time, extrudability and buildability were determined through several laboratory tests which included flowability, slump, shape retention factor (SRF), direct shear tests, as well as simple printing simulations using a caulking gun mortar. In addition, a compressive strength test was carried out on a 50x50x50 mm3 cube-shaped mortar sample. The compressive strength test was carried out at the age of 1; 28 and 56 days. The results of flowability and slump tests show a decrease in value over the time of the test. Whereas in the rheology testing approach using direct shear and slump, the values of cohesion, shear stress and yield stress increase with the time of the test. This occurrence indicates that the mortar tested after the stationary phase will harden. The speed of the mortar hardens as indicated by the value of cohesion, shear stress and yield stress are influenced by the addition of CaCl2 and SNF to the mixture. Mix with the admixture proportion of CaCl2 and SNF of 1% and 0.5% (MC1-S0.5) respectively has a decrease in flowability and slump, increase in melt stress, SRF, cohesion as well as extrusion and buildability trials in laboratory and simulation meet the printing parameters of 3D printing concrete using a D-Shape type machine. Therefore MC1-S0.5 has thixotropic properties that support fresh phase conditions (open time, pumpability, extrudability) and hardening phase (buildability) with strong pressure at 28 days of 50,15 MPa. The compressive strength achieved determines the implementation of the mortar as a structural material for the interior of the building.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Mortar Cetak 3D, High Volume Fly ash, Sulfonate Naphthalene Formaldehyde, Kalsium Klorida; The 3D printing Mortar, High Volume Fly ash, Sulfonate Naphthalene Formaldehyde, Calcium Chloride |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) > TA681 Concrete construction |
| Divisions: | Faculty of Vocational > Civil Infrastructure Engineering (D4) |
| Depositing User: | Virgin Risdianto |
| Date Deposited: | 27 Sep 2023 06:42 |
| Last Modified: | 27 Sep 2023 06:42 |
| URI: | http://repository.its.ac.id/id/eprint/102940 |
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