Comparison of fly ash with Lapindo mud as a land stabilizer for landfill in Pasuruan–Indonesia

Sudjianto, Agus Tugas; Halim, Abdul; Gembiranto, Oktiono; Susilo, Sugeng Hadi

doi:10.15587/1729-4061.2021.234518

Cited by 2 publications

(2 citation statements)

References 13 publications

(11 reference statements)

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“…Thicker and stiffer slabs tend to produce smaller cracks. In some studies, a recommended minimum thickness for hard pavement slabs has been proposed [18].…”

Section: Concrete Quality F C =30 Mpa Steel Quality F U =580 Mpa the ...mentioning

confidence: 99%

Identifying the influence of reinforcement ratio on crack behaviour of rigid pavement

Soehardjono,

Wibowo,

Nuralinah

et al. 2023

EEJET

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The problem found in many rigid pavement concrete slabs is the occurrence of cracks. Research on the width of cracks in rigid pavement due to the influence of reinforcement ratio is necessary because the stiffness and strength of concrete slabs are related to slab thickness, concrete quality, reinforcing steel quality and reinforcement numbers. This study aims to determine the cracking behavior of rigid pavements subjected to monotonic static line loads due to variations in reinforcement ratio experimentally. Specimens tested in the laboratory were 2×0.6×0.2 m concrete slabs placed on 30 cm thick soil with 6 % CBR value as a support. The variation of reinforcement ratio was ρ=0.004; ρ=0.007; ρ=0.01; ρ=0.02. Concrete quality fc=30 MPa, steel quality fu=580 MPa. The results shows at small reinforcement ratios the results are close to the average crack width of the formula from the regulations and at large reinforcement ratios the results are further away from the average crack width based on the formula in the regulations. The largest crack width observed in this study occurred in rigid pavement with a reinforcement ratio of ρ=0.004, under a load of 210 KN, resulting in a crack width of 0.519 mm. It was found that the relationship between crack width and the reinforcement ratio follows a linear equation across all variations. The research also revealed variations in crack width between experiments conducted under different design codes, with results closely aligning with the average crack width determined by rule-based formulas, especially for a small reinforcement ratio (ρ=0.004). Conversely, for a larger reinforcement ratio (ρ=0.01), the results deviated further from the crack width predicted by the code-based formula

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“…Thicker and stiffer slabs tend to produce smaller cracks. In some studies, a recommended minimum thickness for hard pavement slabs has been proposed [18].…”

Section: Concrete Quality F C =30 Mpa Steel Quality F U =580 Mpa the ...mentioning

confidence: 99%

Identifying the influence of reinforcement ratio on crack behaviour of rigid pavement

Soehardjono,

Wibowo,

Nuralinah

et al. 2023

EEJET

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“…Substrates containing high lignin, cellulose, and hemicellulose require special handling before the anaerobic digestion process. So that from the formation of biogas et two benefits at the same time, namely obtaining biogas as fuel and reducing the volume of waste optimally [4,7].…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of NOX formation in CO2 diluted biogas premixed combustion

Susilo

Wicaksono

2021

Eureka: PE

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A further investigation of premixed biogas combustion towards the NOx formation is presented in this study. The purpose of the simulation is to determine the addition of CO2 in biogas fuel to the combustion behavior of premixed biogas on NOx formation, and to determine the occurrence of NOx in the pre-mixed biogas combustion. In this study, the Counterflow Premixed Flame class is used where this class is based on the One Dim class which is the basis for simulations with a 1-dimensional domain. The Counterflow Premixed Flame class uses an axisymmetric stagnation flow domain which has been written based on the equations. Cantera uses Newton's method to solve them. Completion is carried out in two stages. The first stage is to solve the solution using the equilibrium at each z coordinate point that has been determined. Many estimation starting points are determined from the start of the program. The second stage is the recalculation process at each point and then subdivided to get a smoother solution. The premixed excess CO2 biogas fuel and air combustion analyzed using a 1-dimensional numerical study. The diluted CO2 mass fraction ranged between 0–40 %. The CH4/CO2/air volume flow rate was maintained in ±L/min. The analysis implements the 1-D Counter Flow approach. Two counterflow nozzles were 20mm in diameter and the flame stagnation point at 10 mm. The results show that NOx mass fraction formed only on a fuel-lean mixture of CH4/CO2/air and its values decreased along with CO2 added. The addition of CO2 could reduce the NO species mass fraction down to 18 %, and NO2 reduction down to 7 %. This is mainly caused by a decreasing heat release rate of NO+N↔N2+O, N+O2↔NO+O, N+OH↔NO+H, and N+CO2↔NO+CO reactions. The N+CO2↔NO+CO reaction increased as CO2 was added but its values were not as much as the decline of three other reactions

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Comparison of fly ash with Lapindo mud as a land stabilizer for landfill in Pasuruan–Indonesia

Cited by 2 publications

References 13 publications

Identifying the influence of reinforcement ratio on crack behaviour of rigid pavement

Identifying the influence of reinforcement ratio on crack behaviour of rigid pavement

Numerical analysis of NOX formation in CO2 diluted biogas premixed combustion

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