Pengaruh Superplasticizer Terhadap Perilaku Slump Loss Beton Geopolymer Berbasis High Calcium Fly Ash Dengan Metode Pencampuran Kering

Shoifah, Umi Arifatus (2022) Pengaruh Superplasticizer Terhadap Perilaku Slump Loss Beton Geopolymer Berbasis High Calcium Fly Ash Dengan Metode Pencampuran Kering. Diploma thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Beton geopolymer merupakan material ramah lingkungan, yang dibentuk melalui proses geopolimerisasi prekursor yang kaya dengan alumina silikat aktif dan alkali activator. Salah satu material limbah dengan kadar alumina silikat cukup tinggi adalah fly ash mencapai 50 - 60%. Fly ash yang digunakan sebagai material pengikat terdapat 2 tipe, yaitu tipe c (high calcium fly ash) dan tipe f (low calcium fly ash). Kandungan high calcium fly ash memiliki kadar cao ≥ 18% mengakibatkan setting time beton berlangsung terlalu cepat sehingga memiliki workability yang rendah. Workability rendah mengakibatkan implementasi beton geopolymer sulit sebagai material kontruksi skala besar. Hilangnya kemampuan kerja beton sering dinyatakan dalam bentuk slump loss, merupakan cara konvensional untuk menggambarkan sifat workability beton segar. Penggunaan superplasticizer (sp) maupun bahan tambah (addictive admixture) merupakan salah satu solusi permasalahan beton geopolymer dalam menjaga kualitas dan kelacakan (workability) beton. Penelitian ini bertujuan untuk mengetahui pengaruh penambahan superplasticizer terhadap workabilitas dan kuat tekan beton geopolymer berbasis high calcium fly ash dengan metode kering. Penerapan metode pencampuran kering (dry mixing method) merupakan salah satu solusi untuk mengatasi pengerasan yang cepat pada beton geopolymer. Pengujian slump loss dilakukan dengan interval waktu 0, 5, 10, 15, 20, 25 dan 30 menit untuk mengetahui penurunan nilai slump yang terjadi. Selain itu pengujian uji kuat tekan beton pada umur 7, 14, dan 28 hari. Penelitian ini menggunakan superplasticizer jenis viscocrete 3115n dan consol p100 esp keduanya merupakan superplasticizer berbasis polycarboxylate dengan variasi kadar masing-masing 3%, 5% dan 7%. Menggunakan molaritas larutan naoh 14 m dengan rasio na2sio3.5h2o/naoh 1:1. Agregat kasar menggunakan ukuran 20 mm, persen agregat gabungan menggunakan rasio 60% : 40%. Komposisi pengikat geopolymer terdiri dari 70% fly ash dan 30% alkali aktivator (naoh + na2sio3). Penerapan metode dry mixing dapat meningkatkan nilai kuat tekan beton geoplymer. Kuat tekan rencana 42 mpa saat berumur 28 hari. Kuat tekan yang terjadi sebesar 49 mpa dengan kadar sp viscocrete 3115n 5% dan penggunakan kadar sp consol p100 esp 5% didapatkan kuat tekan sebesar 37 mpa. Hasil uji workability beton geopolymer menunjukkan bahwa penambahan superplasticizer jenis viscocrete 3115n cukup efektif untuk memperbaiki workability beton geopolymer dari pada penggunaan consol p100 esp. Nilai slump paling tinggi terjadi dengan penambahan kadar sp viscocrete 3115n sebesar 7% yaitu slump awal sebesar 230 mm dan pada menit ke 30 nilai slump menjadi 195 mm. Seiring dengan peningkatan kadar superplasticizer 3%, 5% dan 7% pada beton geopolymer mampu meningkatkan workability beton tanpa terjadi segregasi dan bleeding.
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Geopolymer concrete is an environmentally friendly material, which is formed through a precursor geopolymerization process which is rich in activated alumina silicate and alkali activator. One of the waste materials with high enough alumina silicate content is fly ash reaching 50 - 60%. There are 2 types of fly ash used as binding material, namely type c (high calcium fly ash) and type f (low calcium fly ash). High of calcium fly ash has a cao content of 18% resulting in the setting time concrete flash setting. Workability concrete geopolymer as a large-scale construction material. The loss of workability of concrete is often expressed in terms of slump loss, which is the conventional way to describe the workability of fresh concrete. The use of superplasticizer (sp) and additives (admixture) is one solution to the problem of geopolymer concrete in maintaining the quality and workability of concrete. This research is to determine the effect of adding superplasticizer to the workability and compressive strength of geopolymer based on high calcium fly ash using the dry method. The application of the dry mixing method is one solution to overcome the hardening of geopolymer concrete.testing slump loss is carried out with time intervals of 0, 5, 10, 15, 20, 25 and 30 minutes to determine the decline in the slump value that occurs. In addition, testing the compressive strength of concrete at the age of 7, 14, and 28 days. This final project uses superplasticizer type viscocrete 3115n and consol p100 esp, both superplasticizers -based polycarboxylate with varying levels of 3%, 5% and 7%, respectively. Using the molarity of 14 m naoh solution with a ratio of na2sio3/naoh 1:1. Coarse aggregate uses a size of 20 mm, the percentage of fine and coarse aggregates combined uses a ratio of 60%: 40%. Binder composition geopolymer consists of 70% fly ash and 30% alkali activator (naoh + na2sio3). The application of dry mixing method can increase the compressive strength of geoplymer. The compressive strength of the plan is 42 mpa at 28 days. The compressive strength that occurs is 49 mpa with 5% sp viscocrete 3115n content and using 5% sp console p100 esp content, the compressive strength is 37 mpa. The results of the geopolymer concrete workability test the that showed addition superplasticizer of viscocrete 3115n workability concrete geopolymer to the use of consol p100 esp. The highest slump value occurred with the addition of sp viscocrete 3115n levels of 7%, namely the initial slump of 230 mm and at the 30 minute the slump value became 195 mm. Along with the increase in superplasticizer content of 3%, 5% and 7% in geopolymer able to increase workability of concrete without segregation and bleeding.

Item Type:	Thesis (Diploma)
Additional Information:	RSIS 620.136 Sho p-1 2022
Uncontrolled Keywords:	Workability, dry mixing, slump loss, superplasticizer. Workability, dry mixing, slump loss, superplasticizer
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Divisions:	Faculty of Vocational > 22301-Civil Infrastructure Engineering (D4)
Depositing User:	Mr. Marsudiyana -
Date Deposited:	13 Jul 2026 02:33
Last Modified:	13 Jul 2026 02:33
URI:	http://repository.its.ac.id/id/eprint/134754

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