Article Per Year (5 Year)
p-Index From 2019 - 2024
0.408
P-Index
This Author published in this journals
All Journal U Karst
Made Dharma Astawa
Department of Civil Engineering, Faculty of Engineering, University of Pembangunan Nasional
Civil Engineering, Building, Construction & Architecture

Published : 2 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 2 Documents
Search

 1 
Optimization of Compressive Strength and Porosity of Normal Concrete Using Fly Ash and Alkaline Activators Wahyu Kartini; Made Dharma Astawa; Hendra Setiawan
U Karst Vol 6, No 1 (2022): APRIL
Publisher : Kadiri University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (4428.98 KB) | DOI: 10.30737/ukarst.v6i1.2481

Abstract

The use of cement in the concrete mix is the most expensive material. In the cement production process, there is CO2 emission into the air, which causes the greenhouse effect and global warming. So we need other materials as an alternative to reduce the use of cement by using by-products such as fly ash which is categorized as a Pozzolan material. In this study, fly ash was used with variations of 0%, 70%, 80%, 90%, 100%, water-cement ratio 0.4. Because fly ash does not have the same binding ability as cement, alkaline activators are needed, namely Sodium Silicate (Na2SiO3) and Sodium Hydroxide (NaOH)  , with molarities of 6M and 8M. To determine the compressive strength of concrete, a compressive test was carried out at the age of 7 days and 28 days and a porosity test at the age of 28 days. The maximum compressive strength of concrete with fly ash content of 90% with a molarity of 6M and 8M. The age compressive strength has the same value. At the age of 7 days is 14.43 MPa. At the age of 28 days, it is 18.39 MPa. The greater the use of fly ash and molarity in concrete, the fewer pores in the concrete because the mixture is more concentrated and round, and the small particle size of fly ash can fill voids in the concrete.
Optimization of Compressive Strength and Porosity of Normal Concrete Using Fly Ash and Alkaline Activators Wahyu Kartini; Made Dharma Astawa; Hendra Setiawan
U Karst Vol. 6 No. 1 (2022): APRIL
Publisher : Kadiri University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30737/ukarst.v6i1.2481

Abstract

The use of cement in the concrete mix is the most expensive material. In the cement production process, there is CO2 emission into the air, which causes the greenhouse effect and global warming. So we need other materials as an alternative to reduce the use of cement by using by-products such as fly ash which is categorized as a Pozzolan material. In this study, fly ash was used with variations of 0%, 70%, 80%, 90%, 100%, water-cement ratio 0.4. Because fly ash does not have the same binding ability as cement, alkaline activators are needed, namely Sodium Silicate (Na2SiO3) and Sodium Hydroxide (NaOH)  , with molarities of 6M and 8M. To determine the compressive strength of concrete, a compressive test was carried out at the age of 7 days and 28 days and a porosity test at the age of 28 days. The maximum compressive strength of concrete with fly ash content of 90% with a molarity of 6M and 8M. The age compressive strength has the same value. At the age of 7 days is 14.43 MPa. At the age of 28 days, it is 18.39 MPa. The greater the use of fly ash and molarity in concrete, the fewer pores in the concrete because the mixture is more concentrated and round, and the small particle size of fly ash can fill voids in the concrete.
Co-Authors Hendra Setiawan Wahyu Kartini