Claim Missing Document
Check
Articles

Found 4 Documents
Search
Journal : Journal of Advanced Civil and Environmental Engineering

The Effect of Microbes and Fly Ash to Improve Concrete Performance Adlizie Rifkianda Muhammad; Januarti Jaya Ekaputri; Makno Basoeki
JACEE (Journal of Advanced Civil and Environmental Engineering) Vol 4, No 2 (2021): October
Publisher : Universitas Islam Sultan Agung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30659/jacee.4.2.60-69

Abstract

This paper presents the application of fly ash combining with microbes in concrete to reduce cement content. A class F fly ash as cement replacementwas applied with ratios of 20%, 30%, 40%, and 50% to reduce hydration heat. Microbes from bacterial consortium were applied to as the filler to increase concrete compressive strength. The concrete mix design from SNI 03–2834–2000 was applied for a compressive strength target of 30 MPa. The mechanical test was carried out consisting compressive and tensile test. Concrete workability and the heat hydration measurement were performed for fresh concrete. The results showed that the maximum strength of 45.10 MPa was obtained from specimens with 30% fly ash content. Application of microbes associated with fly ash content of 40% showed the maximum strength of 48.47 MPa. It was found that the tensile strength also increased with the application of fly ash and microbes. Hydration temperature of concrete decreased with the increase of the ash content. This proves that the application of fly ash and microbes in concrete can reduce the cement as well as increasing the concrete performance.
The Effect of Bottom Ash on the Compressive Strength and Tensile Strength of HVFA Concrete Yusak Nurrizki; Januarti Jaya Ekaputri
JACEE (Journal of Advanced Civil and Environmental Engineering) Vol 6, No 1 (2023): April
Publisher : Universitas Islam Sultan Agung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30659/jacee.6.1.12-23

Abstract

This paper focuses on the effects of High Volume Fly Ash (HVFA) concrete with high content Bottom Ash (BA) as a fine aggregate. A strength target of 45 MPa with 12 ± 2 cm slump concrete was determined as a control. The tests that carried out were compressive strength at the age of 3 to 90 days ages and splitting strength at the age of 28 to 90 days ages, slump test, measurement of heat of hydration, and concrete autogeneous shrinkage. Variations in the concrete mix tested were HVFA without BA with FA content of 50% - 80%, and HVFA with 50% BA as a sand replacement. The In general, the use of high volume BA in the HVFA mixture provided an increase in strength both at the initial age and final in all variations. The internal curing effect provided by BA accelerated the hydration and solidification process at the early age, thus giving the effect of increasing the mechanical properties of concrete. However, the acceleration of solidification was accompanied by the increase in the shrinkage. BA properties which have greater absorption compared to sand also caused the workability decreased.
Utilization Of Buton Asphalt Solid Waste (ASW) Waste Bitumen Extraction In Concrete Aulia, Siti Aja; Ekaputri, Januarti Jaya
JACEE (Journal of Advanced Civil and Environmental Engineering) Vol 7, No 1 (2024): April
Publisher : Universitas Islam Sultan Agung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30659/jacee.7.1.48-64

Abstract

Indonesia has 650 million tons of Buton Rock Asphalt (Asbuton) deposits.  The mineral residue, known as Asphalt Solid Waste (ASW). The extraction left ASW by 65-90% of asbuton’s weight. However, 770 thousand tons/year of ASW remain underutilized, causing environmental pollution due to its hydrocarbon content. Based on XRD results, Asbuton minerals were dominated with 46% CaCO3, which are potential as a subtitute material in concrete. However, its hydrocarbon content at 68,911 ppm raises concerns. To prevent ASW hydrocarbons from contaminating concrete, solidification was attempted. This study investigates solidification by making Artificial Coarse Aggregate (ACA) products and using ASW as a subtitute for gravel in concrete. The ACAs were produced from a mixture of ASW and cement, molded into 50 x 100 mm cylinders, crushed after twenty eight-days moist curing, and tested according to ASTM C33 standard of gravel. ASW replaced 0-12.5% by volume of sand and ACA replaced 0-12.5% by volume of gravel in concrete with a target compressive strength of 45 MPa at twenty eight-days. Heat of hydration and shrinkage were tested to indentify the impact of CaCO3 from ASW on concrete. The results showed that ACA could reduce 9% of ASW hydrocarbons. However, the ACA produced did not meet the gravel standard in ASTM because ACA absorption reached 6.75% and abrasion test up to 57%. Neverthless, ASW’s high absorption reduced heat hydration by 10% and shrinkage by 83% compared to normal concrete.
Performance and Durability of High-Volume Fly Ash Concrete Incorporating Bacillus safensis : A Comparative Study of Class C and Class F Fly Ash Amini, Iqlima Nuril; Syah, Dzikrie Fikriyan; Setiamarga, Davin H. Ekaputra; Basoeki, Makno; Danardi, Luki; Laory, Irwanda; Anda, Martin; Maulana, Mahendra Andiek; Wulandari, Meity; Ekaputri, Januarti Jaya
JACEE (Journal of Advanced Civil and Environmental Engineering) Vol 8, No 2 (2025): October
Publisher : Universitas Islam Sultan Agung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30659/jacee.8.2.8-21

Abstract

This study investigates the performance and durability of high-volume fly ash (HVFA) concrete enriched with Bacillus safensis, focusing on the comparative influence of Class C and Class F fly ash. Concrete mixtures were prepared with varying proportions of both fly ash types, with and without microbial addition, and tested for fresh and hardened properties including compressive strength, splitting tensile strength, porosity, and workability. Durability was further evaluated using the rapid chloride penetration test (RCPT) and accelerated corrosion test (ACT).Results showed that Class C fly ash, with its higher calcium content, produced a denser microstructure and improved early compressive strength. In contrast, Class F fly ash supported more favorable long-term microbial activity due to greater porosity and water availability. Incorporating Bacillus safensis enhanced compressive strength by up to 8% and significantly reduced chloride ion penetration, particularly in Class F fly ash concrete, through calcium carbonate precipitation within the pores. However, microbial addition was associated with reduced splitting tensile strength, likely due to differences in failure mechanisms. Long-term observations revealed strength gains of up to 13.3% after one year in microbial HVFA concrete.These findings demonstrate the synergistic contribution of Bacillus safensis and the effect of fly ash type to the improvement of sustainability and durability of HVFA concrete.