scholarly journals Stability performance of demolition waste composite as landfill liner

2021 ◽  
Vol 896 (1) ◽  
pp. 012001
Author(s):  
M A Budihardjo ◽  
M Hadiwidodo ◽  
I W Wardhana ◽  
E G Praptomo ◽  
B P Samadikun ◽  
...  
Keyword(s):  
Permeability Coefficient ◽  
Shear Angle ◽  
Design Criteria ◽  
Direct Shear ◽  
Permeability Test ◽  
Specific Design ◽  
Demolition Waste ◽  
Landfill Liner ◽  
Stability Performance ◽  
Essential Components

Abstract Landfill liner is one of the essential components that prevent leachate infiltration of the soil from causing pollution. A liner has specific design criteria to function optimally. This study analyses the permeability and stability value of the mixture of composite materials consisting of demolition waste, bentonite, and lime materials. This study using some methods include falling head method for permeability test and direct shear strength for stability test. Based on the results of this research, it can be seen that the mixture of demolition waste and bentonite to composite can reduce the internal shear angle and increase the cohesion. While lime provides a fluctuating value for cohesiveness, it can increase the internal shear angle. The best mixture to be used as an alternative composite liner is the V6 composite which has a demolition waste composition of 79%, 20% bentonite, and 1% lime with a permeability coefficient value of 8.526 × 10−7 cm/s.

Research of Hydraulic Characteristics of Cofferdam and Leaching System on Joint Way of Nanjing Second Yangtse Bridge

2013 ◽  
Vol 353-356 ◽  
pp. 1040-1046
Author(s):  
Jian Yong Shi ◽  
Xiang Juan Yu ◽  
Ying Bo Ai
Keyword(s):  
Deformation Monitoring ◽  
Direct Shear ◽  
Permeability Test ◽  
Hydraulic Characteristics ◽  
Drainage Ditch ◽  
Drainage Time ◽  
Hydraulic Filling ◽  
Monitoring Result ◽  
Key Points ◽  
Parameter Test

The hydraulic filling is the construction method of joint way in Nanjing Second Yangze Bridge. The leaching facility, drainage time and cofferdam stability in filling are key points in design. By laboratory test, the compaction, direct shear and permeability test of different compaction are investigated. The deformation through field monitor is carried during the cofferdam construction and hydraulic filling. After parameter test and stability analysis according to hydraulic filling, it is shown that the drainage ditch in base of cofferdam can satisfy drainage requirement, the leaching time is about half of one month. The compactness of cofferdam is 0.92. The slope of cofferdam during construction and hydraulic filling is in stability by analysis. And the cofferdam is in stable situation during hydraulic filling according to deformation monitoring result.

scholarly journals Design Criteria of Soft Exogloves for Hand Rehabilitation-Assistance Tasks

2020 ◽  
Vol 2020 ◽  
pp. 1-19
Author(s):  
Juana-Mariel Dávila-Vilchis ◽  
Juan C. Ávila-Vilchis ◽  
Adriana H. Vilchis-González ◽  
LAZ-Avilés
Keyword(s):  
Control Strategy ◽  
Degrees Of Freedom ◽  
Design Guidelines ◽  
Design Criteria ◽  
Hand Rehabilitation ◽  
Specific Design ◽  
Usability Criteria ◽  
Functional Task ◽  
Force Pressure ◽  
Weight Force

This paper establishes design criteria for soft exogloves (SEG) to be used as rehabilitation or assistance devices. This research consists in identifying, selecting, and grouping SEG features based on the analysis of 91 systems that have been proposed during the last decade. Thus, function, mobility, and usability criteria are defined and explicitly discussed to highlight SEG design guidelines. Additionally, this study provides a detailed description of each system that was analysed including application, functional task, palm design, actuation type, assistance mode, degrees of freedom (DOF), target fingers, motions, material, weight, force, pressure (only for fluids), control strategy, and assessment. Such characteristics have been reported according to specific design methodologies and operating principles. Technological trends are contemplated in this contribution with emphasis on SEG design opportunity areas. In this review, suggestions, limitations, and implications are also discussed in order to enhance future SEG developments aimed at stroke survivors or people with hand disabilities.

scholarly journals Performance of Porous Asphalt Mixture Containing Seashell as Aggregate Replacement

CONSTRUCTION ◽  
2021 ◽  
Vol 1 (1) ◽  
pp. 18-28
Author(s):  
Nicole Liew Siaw Ing ◽  
Ramadhansyah Putra Jaya ◽  
Khairil Aazman Masri
Keyword(s):  
Permeability Coefficient ◽  
Asphalt Pavement ◽  
Asphalt Mixture ◽  
Volumetric Properties ◽  
Permeability Test ◽  
Porous Asphalt ◽  
Percentage Loss ◽  
Marshall Test ◽  
Aggregate Impact Value ◽  
Cockle Shell

Porous asphalt pavement is mainly used for parking lots which able to let water to drain through the pavement surface into a stone recharge bed and infiltrate into soils under the pavement. This study is to investigate the performance of seashell in porous asphalt and determine the image analysis. The seashell used in this study is cockle shell. The strength of seashell was determined through the Aggregate Impact Value Test (AIV) and Aggregate Crushing Value Test (ACV). The grade of bitumen used was grade 60/70. The porous asphalt volumetric properties was determined through Marshall Stablity Test. The permeability coefficient of sample that contain seashell as aggregate replacement was determined through Permeability Test. Generally, the results shows that the seashell’s percentage loss (AIV and ACV) is suitable use for porous asphalt mixture, where the percentage of loss for AIV and ACV was 27.84% and 7.65% respectively. Based on the Marshall Test, porous asphalt that containing seashell as aggregate replacement shows a different result, where it had lower stability value and it can increase the bulk density of porous asphalt mixture. Furthermore, the permeability coefficient also increase. The surface of seashell able to bond with bitumen. Lastly, the trend of VFA and VTM value is effected by the surface and position of seashell in the porous asphalt sample.

Model Kitchen Design for the Low Vision Elderly Community

1988 ◽  
Vol 82 (6) ◽  
pp. 240-245
Author(s):  
R.L. Null
Keyword(s):  
Multidisciplinary Team ◽  
Low Vision ◽  
Vision Impairment ◽  
Design Criteria ◽  
Team Approach ◽  
Elderly Persons ◽  
Facility Design ◽  
Specific Design ◽  
Multidisciplinary Team Approach ◽  
Training Facility

This article addresses characteristics of elderly persons with vision impairment, presenting arguments for creating responsive rehabilitation environments for this rapidly increasing population. A multidisciplinary team approach to training facility design is recounted and specific design criteria are outlined.

scholarly journals Analysis of the thermal loads required by a small-medium sized winery in the Mediterranean area

2017 ◽  
Vol 48 ◽  
Author(s):  
Alberto Barbaresi ◽  
Daniele Torreggiani ◽  
Francesco Tinti ◽  
Patrizia Tassinari
Keyword(s):  
Energy Demand ◽  
Integrated Approach ◽  
Mediterranean Area ◽  
Building Envelope ◽  
Design Criteria ◽  
Thermal Loads ◽  
Specific Design ◽  
Wine Making ◽  
Critical Issues ◽  
The Mediterranean

Since the Nineties of the previous century winery design has been undergoing deep changes. Some factors are affecting the main design criteria, focusing on a new conception where the winery becomes more and more open to customers, energy demand reduction is a crucial goal driven by economic and environmental reasons, and the whole systems is aimed at the research of a renovate quality of the product. The state of the art in this specific sector highlights how a reduction of the energy consumed by a winery can almost reduce to zero the carbon emissions of the whole wine-making process, as well as the existing lack of specific design criteria addressing the most recent above-mentioned trends and challenges, in particular for small and medium-sized farms, that on the whole account for a huge production in the Mediterranean area. The main aim of this work is to provide information about yearly thermal demand in the wine-making sector, by means of an integrated approach that considers the thermal loads required by room heating and air conditioning, must/juice pre-cooling, and fermentation cooling. Different models have been created and tested on a case study, in order to analyze the contribution of various farm design choices to the total energy demand. The most representative models are described and analyzed in this work: they differ for harvesting modality, and materials and vertical distribution of the building envelope (aboveground vs underground). The results highlight the relevance of the three contributions in terms of total annual energy consumption, power peaks, and time distribution of energy demand over the year. The analysis of the data obtained by the different models have allowed to identify the strengths and potential critical issues, and to provide professionals, oenologists and farmers with useful elements to lend support in their decision making processes, as well as to define the next steps of the research, aimed at defining specific design criteria for small and medium-sized wineries.

Air Permeability Measurement

1988 ◽  
Vol 137 ◽  
Author(s):  
Daniel Perraton ◽  
André Carles-Gibergues ◽  
Pierre-Claude Aitcin ◽  
Bernard Thenoz
Keyword(s):  
Permeability Coefficient ◽  
Room Temperature ◽  
Air Permeability ◽  
Permeability Test ◽  
Permeability Measurement ◽  
Permeability Coefficients ◽  
Corrected Equation ◽  
Variable Porosity ◽  
Margin Of Error ◽  
The Difference

AbstractAir permeability was determined for concretes of variable porosity (w/c ratio of 0.33, 0.50, and 0.67). The reproducibility of the test and the ability to characterize the permeability of different concrete were evaluated. Results indicate that air permeability test gives suitable reproducibility with a margin of error of 10%, which tends to improve with increase in w/c ratio. The difference in air permeability of concretes with the w/c ratios investigated are distinguishable by this technique. Furthermore air permeability coefficients used were modified with equations derived in accordance to Darcy's law, and the resulting air permeabilities compared. Data calculated with an air permeability coefficient based on mean radius pore (corrected equation) appears to give a more realistic value with greater differentiation between the ranges. Values were determined on specimens after 28 days, maintained at room temperature (50% RH), then again after an additional 2 days at 60°C in a ventilated oven. Oven-dried specimens exhibit significantly greater air permeability.

scholarly journals Water Absorption, Sorptivity and Permeability Properties of Concrete Containing Chemical and Mineral Admixtures

2021 ◽  
Vol 6 (2) ◽  
Author(s):  
O.O. Akinkurolere
Keyword(s):  
Water Absorption ◽  
Permeability Coefficient ◽  
Mineral Admixtures ◽  
Concrete Durability ◽  
Permeability Test ◽  
Calcined Clay ◽  
Chemical Admixtures ◽  
Concrete Mix ◽  
The Right ◽  
Reduced Water

Concrete durability, especially in water-logged environments might not be possible with conventional constituents of concrete. A combination of mineral and chemical admixtures in different proportions is used to study water absorption, sorptivity, and permeability behavior of concrete. The water absorption, sorptivity, and permeability test were carried out using nine (9) trial mixes of different proportions of Calcined Clay (CC), Sawdust Ash (SDA), Crystalline Based Admixture (CBA), and Superplasticizer (SP). The results showed that treating concrete with 5% CC + 5% SDA+1% CBA combination gives optimum performance in terms of sorptivity with reduced water absorption value of 4.60%. While the permeability coefficient of concrete is reduced when CC and SDA are added to concrete mix separately, the reactivity between their combination (CC and SDA) significantly increased permeability coefficient of the concrete. The study demonstrates that production of concrete with the right proportions of admixture and pozzolanas improve the durability of concrete structures.

scholarly journals PENGUJIAN PROPERTIES LIMBAH TAILING KERING PADAT UNTUK PEMANFAATAN MATERIAL STABILISASI TANGGUL

2020 ◽  
Vol 1 (1) ◽  
pp. 633-640
Author(s):  
Rakhmad Aji Prakosa
Keyword(s):  
Material Properties ◽  
Permeability Coefficient ◽  
Construction Material ◽  
Shear Angle ◽  
Maximum Density ◽  
Red Soil ◽  
Dump Truck ◽  
Soil Material ◽  
Heavy Equipment ◽  
Dry Conditions

ABSTRAK Hasil ekstraksi ore menjadi emas pada kegiatan pengolahan emas PT.Antam Tbk. - UBPE Pongkor, menghasilkan limbah hasil olahan berupa tailing yang dibuang ke TSF dalam bentuk slurry (20%solid) kemudian diendapkan di beberapa kompartemen tampungan sebelum masuk ke Instalasi Pengolahan Air Limbah (IPAL). Tailing yang mengendap kemudian dikeruk dengan alat berat menuju area penimbusan akhir dengan kondisi Tailing 60% solid. Semakin banyak tailing yang dihasilkan, maka semakin banyak juga upaya yang harus dilakukan untuk menyediakan tampungan tailing. Secara visual, tailing kering berbentuk seperti pasir, yang saat dalam kondisi padat memiliki daya dukung yang sangat baik untuk menahan beban diatasnya. Hal tersebut dibuktikan adanya dump truck dengan beban puluhan ton melintas diatas tailing kering padat sebagai pijakan tumpuannya tanpa mengalami failure. Dari kasus tersebut tailing kering dapat memungkinkan untuk dimanfaatkan sebagai material konstruksi tanggul, mengingat kemampuan daya dukungnya yang cukup baik saat dalam kondisi kering padat. Sehingga perlu dilakukan pengujian properties material tailing meliputi nilai kepadatan maksimumnya (ɣd), berat jenis (BJ), nilai sudut geser dalam (ϕ), dan nilai kohesi (c).Pengujian properties material tailing dilakukan dengan mengambil sampel terganggu (disturb) pada tailing dalam kondisi kering (±75%solid). Kemudian membuat sample remoulded dari tailing kering dan diperoleh nilai kepadatan tanah maksimumnya. Dari nilai kepadatan maksimum tersebut, dilakukan pengujian geser langsung untuk mengetahui nilai sudut geser dalam dan nilai kohesinya. Selain itu juga dilakukan uji piknometer untuk menghitung densitas tailing. Dari hasil parameter pengujian tersebut, kemudian dibandingkan dengan parameter timbunan tanah merah yang biasa digunakan sebagai material konstruksi tanggul dam dengan tujuan mensubstitusi material tanah merah dengan tailing. Hasil penelitian menunjukkan bahwa kepadatan maksimum tailing mencapai angka 1.65 gr/cm3, dengan kadar air optimum 15.2%, kohesi 10kPa, sudut geser internal 41o dan koefisien  permeabilitas 2.19x10-4cm/dt. Jika dibandingkan dengan properties material tanah merah yang biasa digunakan, memiliki kepadatan maksimum sebesar 1.68gr/cm3, Kohesi 11.5kPa, Sudut geser internal 29o, dan koefisien permeabilitas sebesar 7.7 x 10-6cm/dt yang berarti nilai properties material tailing dan tanah relatif tidak berbeda jauh sehingga dapat dilakukan rekayasa engineering untuk memanfaatkan material tailing sebagai material konstruksi atau sebagai material stabilitas tanggul yang ada di area TSF. Kata Kunci : Tailing, pemanfaatan limbah, material konstruksi ABSTRACT Ore extraction into gold at the gold processing activities of PT.Antam Tbk. - UBPE Pongkor, produces processed waste in the form of tailings which is discharged into TSF in the form of slurry (20% solid) and then deposited in several storage compartments before entering the WastewaterTreatment Plant (IPAL). The deposited tailings are dredged with heavy equipment to the final landfill area with the condition of the tailings 60% solid. The more tailing produced, the more effort must be made to provide tailings storage. Visually, the dry tailings are shaped like sand, when it dense conditions has a very good capacity to distributing load. This case proof by the existence of dump trucks with tens of tons of load passing over the solid dry tailings as a foothold without failure. From these cases, dry tailings can be used as material for embankment construction, given their relatively good carrying capacity when in dense dry conditions. So that it is necessary to test the material properties of the tailings including its maximum density value (ɣd), specific gravity (BJ), deep shear angle value (ϕ), and cohesion value (c). Testing the material properties of tailings is done by taking disturbed samples of the tailings in dry conditions (±75% solid). Then make a remoulded sample from dry tailings and get the maximum soil density value. From the maximum density value, then direct shear testing is performed to determine the value of the deep shear angle and its cohesion value. A pycnometer test was also conducted to calculate the tailing density. From the results of the test parameters, then compared with the parameters of the red soil heap which is commonly used as a dam construction material with the aim of substituting red soil material with tailings. The results showed that the maximum density of tailings reached 1.65 gr / cm3, with an optimum moisture content of 15.2%, cohesion of 10kPa, internal shear angle of 41o and permeability coefficient of 2.19x10-4cm / s. When compared with the properties of the commonly used red soil material, it has a maximum density of 1.68gr / cm3, Cohesion of 11.5kPa, an internal shear angle of 29o, and a permeability coefficient of 7.7 x 10-6cm / second which means the value of the material properties of the tailings and the soil is relatively not differ greatly so that engineering design can be carried out to utilize tailings as construction material or as a dike stability material in the TSF area. Keywords : Tailing, Tailing Utilization, Construction Material

Sign in / Sign up

Export Citation Format

Share Document