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All Journal IPTEK The Journal of Engineering
Arwinda Aribah Cahyani
Institut Teknologi Sepuluh Nopember
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Engineering Mechanical Engineering

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Performance of Workability and Compressive Strength on Self-Compacting Geopolymer Concrete Based On High-Calcium Fly Ash With Addictive Admixture Yuyun Tajunnisa; Nur Achmad Husin; Sigit Darmawan; Ridho Bayuaji; Raden Buyung Anugraha; Arwinda Aribah Cahyani
IPTEK The Journal of Engineering Vol. 9 No. 1 (2023)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23378557.v9i1.a16237

Abstract

Geopolymer concrete has been developed as a replacement for conventional concrete with other pozzolan materials, which have a high silicate alumina content. Fly ash is a material that contains a high silicate alumina of 22%. The high content of Al and Si increases the compressive strength of concrete. High-calcium fly ash is abundantly found in Indonesia. However, it has not been widely used for industry or research, and this is due to the fast hardening time of concrete. Therefore, it has the potential to be developed. High-quality concrete has a low cement water factor that causes low workability in concrete. Self-compacting geopolymer concrete (SCGC) has been developed as a high-quality concrete innovation with high workability. Concrete is produced by using gravel, sand, fly ash, alkaline activator, and water materials. This study used 14 Molar levels of NaOH. The variations used were 0%, 3%, 5%, and 7% superplasticizers (SP) made from polycarboxylate. This study used a dry mixing method to overcome the setting time on concrete. The results show that the workability that can be achieved is 645mm, and the compressive strength achieved is 41.7 Mpa
Role of Limestone Addition in Improving the Initial Compressive Strength of Geopolymer Concrete for Corrosive Environment Repair Arwinda Aribah Cahyani; Nur Ahmad Husin; Ridho Bayuaji; Yuyun Tajunnisa
IPTEK The Journal of Engineering Vol. 10 No. 2 (2024)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23378557.v10i2.a20763

Abstract

Geopolymer Concrete (GC) is highly durable in corrosive environments, making it a viable material for repair. However, its initial compressive strength was below the 7 megapascals required at one-day age. Adding fine limestone (45 micrometer) can improve GC's density and early strength. This study explores the effects of adding 0 percent, 3 percent, 5 percent, and 7 percent limestone and 1 percent sucrose superplasticizer to GC 16M. The compressive strength was tested at 1, 3, 7, and 28 days, along with slump, permeability, and resistivity tests to assess the durability. The results show that adding 5 percent limestone yields the optimal GC performance for repairing corrosive environments. The compressive strengths were 15.96, 28, 43, and 67.14 megapascals at 1, 3, 7, and 28 days, with a slump of 120 millimeters. The permeability and resistivity results were 0.128 × 10^-16 square meters and 57.87 kiloohm-centimeter, indicating normal corrosion levels. These findings confirm that GC with 5 percent limestone meets the durability and strength requirements of repair materials in corrosive environments.
Co-Authors Nur Achmad Husin Nur Ahmad Husin Raden Buyung Anugraha Ridho Bayuaji Sigit Darmawan Yuyun Tajunnisa