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检索条件"丛书名=Lecture Notes in Civil Engineering"

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Iron Removal Efficiency in Synthetic Acid Mine Drainage (AMD) Treatment Using Peat Soil 1

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3rd International Conference on Green Environmental engineering and Technology (IConGEET) / 7th International Conference on Green Design and Manufacture (IConGDM)

作者： Halim, Mohd Syazwan Mohd Ibrahim, Abdul Haqi Izhar, Tengku Nuraiti Tengku Ismail, Suhaina Ishak, Ku Esyra Hani Ku Moncea, Andreea Univ Malaysia Perlis Fac Civil Engn Technol Perlis 02600 Malaysia Univ Malaysia Perlis Ctr Excellence Water Res & Environm Sustainabil G Perlis 02600 Malaysia Univ Sains Malaysia Sch Mat & Mineral Resources Engn Engn Campus Nibong Tebal 14300 Pulau Pinang Malaysia Natl Inst Res & Dev Environm Protect Buchares INC 294 Splaiul Independentei St6th Dist Bucharest 060031 Romania

ISBN: (数字)9789811679209

ISBN: (纸本)9789811679209;9789811679193

Acid mine drainage (AMD) formation is due to the sulfide minerals reaction either chemically or biologically when exposed to atmospheric conditions. The AMD formation often occurred in the region involved with anthropogenic activities, including mining, agricultural plantation, urban development and logging. Treatment of AMD is a challenging part of most mining operations around the world. Selection of method treatment is crucial depending on the area's geological, mineralogical, topography and AMD characteristic. There are two types of method treatment;active and passive treatment method. In this study, passive treatment method was adopted;which is successive alkalinity producing system (SAPS). The study aims to analyze effect of variable parameters on iron (Fe) concentration and propose optimum operating condition for AMD treatment. Peat soil and limestone aggregate was used as treatment media in treatment tank. Synthetic AMD was formulated using sulphuric acid (H2SO4) and iron sulfate (FeSO4) to represent actual AMD. Once the synthetic AMD was introduced, water samples were collected and analyzed using UV-Vis test after 6 to 48 h' retention time. Based on the analysis, the proposed methodology has successfully reduced more than 85% iron content only after 6 h of retention time. The maximum Fe removal percentage recorded was 95%, using the higher peat soil depth configuration. The statistical analysis results show that the optimum operating condition for SAPS with high Fe removal is using high peat soil depth. Experiments with higher peat soil depth provide satisfactory results in treating the high initial Fe concentration regardless of the retention time for the AMD treatment.

关键词： Passive treatment AMD Successive alkalinity producing system (SAPS) Peat soil Heavy metal

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Landslide at Govindghat-Investigation and Stabilization Measures 4th

Landslide at Govindghat-Investigation and Stabilization Meas...

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4th International Conference on Transportation Geotechnics (ICTG)

作者： Sundaram, Ravi Gupta, Sanjay Korulla, Minimol Budhbhatti, Rudra Mourya, Pankaj CengrsGeotech Pvt Ltd A-100 Sect 63 Noida UP India Maccaferri Environm Solut Pvt Ltd Gurgaon Haryana India Minist Rd Transport & Highways Mumbai Maharashtra India

ISBN: (纸本)9783030772383;9783030772376

A cloudburst and flash flood in June 2013 in the state of Uttarakhand, India caused landslide at Govindghat located along a major highway. Large boulders in soil matrix were encountered in the area. Water seeping through the open pores between the boulders and erosion of the soil was the major causes of the slope-failure. Erosion of the accumulated debris on the valley side during periods of high discharge in the area also added to the instability. The stabilization measures adopted include a secured drapery of rock anchors and steel mesh on the hill side, nailed gabions at road level, reinforced soil wall to ensure the desired road width, and river-side gabion wall for erosion protection.

关键词： Landslide Cloudburst Boulder-soil matrix Seismic refraction tests Hill-slope stabilization Erosion protection

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Cloud-Based Approach for Water Quality Monitoring: A Review 1

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3rd International Conference on Green Environmental engineering and Technology (IConGEET) / 7th International Conference on Green Design and Manufacture (IConGDM)

作者： Zahari, Nazirul Mubin Saeed, Adel Saleh Salem Zawawi, Mohd Hafiz Roslin, Nursyadzatul Tasnim Abd Aziz, Nurhanani Nurhikmah, Farah Univ Tenaga Nas Coll Engn Dept Civil Engn Kajang 43000 Selangor Darul Malaysia Univ Tenaga Nasl UNITEN UNITEN R&D Sdn Bhd Kajang 43000 Selangor Darul Malaysia

ISBN: (数字)9789811679209

ISBN: (纸本)9789811679209;9789811679193

Water quality monitoring is essential to check whether the water is suitable and safe to consume daily. Many researchers conducted current systems to measure the water quality by the smart system in which helps to reduce the time consuming of the monitoring system. One of the recent ways to monitor water quality is a cloud-based approach which is the space of data collected to check water quality. The cloud-based system can be created by using equipment that helps make the water quality information such as sensors, controllers, and communication technology which are essential equipment to allow users to access and read the information of water quality. This review paper investigated many recent works of researchers using the cloud-based approach to monitor water quality. It focused more on controllers, sensors, communication technology of previous researchers they used to evaluate it to improve the system of water quality monitoring.

关键词： Water quality Cloud Controller Sensors Communication technology IoT

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Prestressing Effects of Jacking-Cambered Wood Beams Reinforced with FRP Strips 10th

Prestressing Effects of Jacking-Cambered Wood Beams Reinforc...

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10th International Conference on Fibre-Reinforced Polymer (FRP) Composites in civil engineering (CICE)

作者： Zhou, Chaoyang Fan, Wenhua Cent South Univ Sch Civil Engn Changsha 410075 Peoples R China

ISBN: (纸本)9783030881665;9783030881658

When a wood beam is cambered by jacking and then bonded with a laminate of fiber reinforced polymer (FRP), the established prestress is low due to the limitation of interfacial bonding capacity. In this paper, self-locking anchorage is added to the strip end of FRP to prevent the debonding failure, which results in cambered beams with end anchored or hybrid anchored FRP. The relations of the FRP tensile stress, effective compressive prestress at the bottom of the beam, and retained camber with the jacking force and the related parameters of the beam and FRP strip are obtained by detailed derivation. The results show that when the FRP tensile stress is critical at the limit state, the lower stress in a cambered beam with end anchored FRP is advantageous to bear greater external load without fracture of FRP. If the ultimate behavior of a cambered beam reinforced with FRP is dominated by conditions of the original beam, hybrid anchorage can achieve larger camber and compressive prestress at the bottom of the beam, which is conducive to counteracting the deflection in service and tensile stress produced by the load.

关键词： FRP strip Prestress Camber Reinforcement Strengthening Beam Anchorage

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Estimation of the Shear Strength of RC Members with Externally Bonded, Fully-Wrapped FRCM Composites 10th

Estimation of the Shear Strength of RC Members with External...

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10th International Conference on Fibre-Reinforced Polymer (FRP) Composites in civil engineering (CICE)

作者： D'Antino, Tommaso Sneed, Lesley H. Focacci, Francesco Politecn Milan Dept Architecture Built Environm & Construct Engn Milan Italy Univ Illinois Dept Civil Mat & Environm Engn Chicago IL USA Univ eCampus Fac Engn Novedrate CO Italy

ISBN: (纸本)9783030881665;9783030881658

Externally bonded (EB) fiber reinforced cementitious matrix (FRCM) composites have been proven to be an effective solution for shear strengthening existing reinforced concrete (RC) members. Different layouts, namely U- and full-wrapping, of the EB composite can be adopted depending on the geometry and type of RC member. In the case of RC beams, the fully-wrapped layout is not always possible due to the presence of the slab. However, this layout is particularly attractive in the case of RC columns, where the composite can be applied easily and may provide significant strength increase. Although FRCM composites are attracting interest, the availability of analytical design models is still quite limited. In particular, few studies regarding the evaluation of the shear strength of FRCM fully-wrapped RC members are available in the literature. In this paper, an analytical model for the estimation of the contribution of fully-wrapped FRCM composites to the shear strength of RC members is proposed. The model is based on the truss analogy commonly adopted by various codes and guidelines for the estimation of the shear strength of RC beams and for fiber reinforced polymer (FRP) strengthened RC beams. The analytical model estimates the contribution of the FRCM to the member shear strength accounting for the bond behavior of the specific composite employed, which is an important aspect since FRCM composites have reported different bond behavior than FRP composites externally bonded to concrete substrates. The accuracy of the model provisions is assessed by comparing analytical and experimental results of RC beams fully-wrapped with a carbon FRCM composite.

关键词： Shear strength Analytical model FRCM composites Fully-wrapped configuration

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Importance of the Geotechnical Variability in the Bearing Capacity of Shallow Foundations Through Random Fields 1

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4th International Conference on Numerical Modelling in engineering (NME)

作者： Mendoza, Cristhian C. Hurtado, Jorge E. Paredes, Jairo A. Univ Nacl Colombia Sede Manizales Dept Ingn Civil Fac Ingn & Arquitectura Campus Palogrande Manizales 170004 Colombia

ISBN: (数字)9789811681851

ISBN: (纸本)9789811681851;9789811681844

This study presents the variability influence of the geotechnical parameters using random fields for shallow foundations. Knowing the variation of bearing capacity can lead to a better foundation design. The present study was made through continuous-footing finite element models (FEM). These FEM models used a constitutive elastoplastic model that takes the geological history of the soil. The model's parameters were generated as random fields with the decomposition matrix technique (Cholesky factorization). Later, these parameters were integrated into the FEM models. Then, more than 2400 FEM simulations were made. The simulations show the parameters that must be carefully obtained to reduce the variability of the load capacity. In addition, the results show that the soil compressibility parameters have a significant influence on the value of the bearing capacity. However, the compression parameters aren't taken into account in the classical equations of bearing capacity.

关键词： Random fields Shallow foundations Elastoplastic model

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Multi-objective Design Optimization of Sandwich Panel 10th

Multi-objective Design Optimization of Sandwich Panel

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10th International Conference on Fibre-Reinforced Polymer (FRP) Composites in civil engineering (CICE)

作者： Benzo, Pier Giovanni Sena-Cruz, Jose Pereira, Joao M. Univ Minho Dept Civil Engn ISISE IB S Guimaraes Portugal

ISBN: (纸本)9783030881665;9783030881658

In the scope of the research project "Lightslab - development of innovative slab solutions using sandwich panel" a new floor system based on sandwich panel has been developed. The lightweight structural system shall be a competitive solution when compared to traditional rehabilitation technique of degraded timber floors in old buildings. The layout of the sandwich prototypes designed involved the use of steel face sheet and: i) steel webs and polyurethane (PUR) foam core system;ii) glass fiber-reinforced polymer (GFRP) webs and PUR foam core system;and iii) outer steel webs and balsa wood core. The design of the sandwich panels included an optimization procedure. A multi-objective genetic algorithm (GA) was developed for this purpose as it is a search method well suited for the solution of optimization problems. The multi-objective GA aims at the minimization of the three objective functions, i.e. cost, mass and environmental footprint of the sandwich panel. The definition of the main feature of the algorithm includes consideration about encoding procedure, fitness scaling, selection method and handling of constraints. The boundary conditions are imposed so that the retrieved solutions will represent a feasible solution to the problem. These boundary conditions are the analytical formulation of the serviceability, ultimate limit state and thermal transmittance verifications imposed by the building codes to sandwich panels. The present paper deals with the introduction of all the aspects of the optimization problems providing as an example the optimization of the panel with steel face sheets, webs and PUR foam.

关键词： Sustainability Sandwich panel Multi-objective optimization Genetic algorithm

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Initiation of 2014 Oso Landslide Using 3D Slope Stability Analyses: Effect of Infiltration 4th

Initiation of 2014 Oso Landslide Using 3D Slope Stability An...

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4th International Conference on Transportation Geotechnics (ICTG)

作者： Kargar, Pourya Osouli, Abdolreza Southern Illinois Univ Carbondale IL USA Southern Illinois Univ Edwardsville IL 62026 USA

ISBN: (纸本)9783030772383;9783030772376

March 2014 Oso landslide, which demolished Steelhead Haven Community near Oso, Washington, is the deadliest in US history. Several factors have been suggested for the initiation of this landslide by various researchers including, the heavy rainfall before the landslide, timber harvesting on the upper plateau, river erosion at the slope toe, groundwater rise due to rainfall infiltration, and irregular 3D topography of the slope. This study utilizes 3D limit equilibrium and 3D finite element seepage analyses to investigate the effect of rainfall infiltration in the 7.5 acres timber harvest area at the top of the slope as well as potential changes of groundwater elevation on the initiation of 2014 Oso landslide. To achieve these objectives, the infiltration rate was varied in the harvested area to investigate its effect on the first phase initiation. Also, two potential groundwater levels were examined to assess the sensitivity of the first phase slide mass to changes in groundwater conditions. The 3D factor of safety for the critical slip surfaces was obtained for the two groundwater levels using two conventional limit equilibrium methods. The safety factor for the critical slip surface is slightly different for the first and second groundwater levels. The difference is such small that it can be concluded that a reasonable rise in groundwater level would not have been the triggering factor for the 2014 Oso landslide. The impacts of other potential factors such as shear strength reductions of upper layers due to the rainfall infiltration, timber harvesting, and/or 3D slope geometry effects appear to have been more influential in the initiation of the landslide.

关键词： Oso landslide 3D slope stability analysis Rainfall infiltration 3D seepage analysis Shear strength

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Flexible Integrated Transport Systems' Potential to Unleash Net Benefits in Rural Areas 6th

Flexible Integrated Transport Systems' Potential to Unleash ...

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6th International Conference on Geotechnics, civil engineering and Structures (CIGOS)

作者： Heinitz, Florian Erfurt Univ Appl Sci Altonaer Str 25 D-99085 Erfurt Germany

ISBN: (纸本)9789811671609;9789811671593

This contribution presents a flexible integrated transport system which features the combination of anticipated peer-to-peer ridesharing and state-licensed on-demand services, complementing fixed-line scheduled transit. A sequential method of estimating the demand potential of such a collaborative service structure versus its supply side is formalized and studied by simulating synthetic network models. The workflow is set to support planning, to prove the efficiency of integrated solutions, and to reduce uncertainties for market entrants.

关键词： Flexible integrated transport system Ridesharing Mobility on demand Mobility as a service Demand-responsive transport Demand model

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Carbon Footprint Assessment from Purchased Electricity Consumption and Campus Commute in Universiti Malaysia Perlis (UniMAP): Pre- and During COVID19 Pandemic 1

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3rd International Conference on Green Environmental engineering and Technology (IConGEET) / 7th International Conference on Green Design and Manufacture (IConGDM)

作者： Baharom, Nor Atiqa Yusuf, Sara Yasina Za'aba, Siti Khadijah Noor, Norazian Mohd Ahmad, Nor Ashikin Ahmad, Wan Amiza Amneera Wan Boboc, Madalina Univ Malaysia Perlis Fac Civil Engn Technol Arau 02600 Perlis Malaysia Univ Malaysia Perlis Ctr Excellence Geopolymer & Green Technol CEGeoGT Sustainable Environm Res Grp SERG Kangar 01000 Perlis Malaysia Univ Malaysia Perlis Ctr Energy Management & Sustainable Campus COSCEM Arau 02600 Perlis Malaysia Univ Malaysia Perlis Ctr Excellence Water Res & Environm Sustainable G Arau 02600 Perlis Malaysia Natl Inst Res & Dev Environm Protect Bucharest IN 294 Splaiul Independentei St6th Dist Bucharest 060031 Romania

ISBN: (数字)9789811679209

ISBN: (纸本)9789811679209;9789811679193

Most institutions and organizations nowadays have been taking responsibility in reducing their carbon footprint (CF) to curtail the global warming impact to at least 20-25% reduction by 2030. Universities and higher learning institutions are starting to invest in becoming greener and carbon-free. Current COVID19 communicable disease has swayed the routine and concurrently influenced regular trends of greenhouse gases (GHG) emissions throughout the world. This study explored the possible GHG emissions (calculated as CO(2)e) from internal campus commute and purchased electricity consumption from the year 2018-2020 at Universiti Malaysia Perlis main campus to analyze the influence of COVID19 pandemic on its CO(2)e emission. The average amount of CO(2)e emitted during pre-COVID19 period (n = 26) was 1,518.8 tCO(2)e/year while during COVID19 period, it was 1,071.5 tCO(2)e/year (n = 10), marked as 29.5% reduction. Due to completeness and quality of data for contracted bus (monitoring period of years 2018, 2019 and 2020 as 12 months, 12 months, and 2 months, respectively), year 2019 was determined as the appropriate baseline year for setting the CO(2)e reduction target due to COVID19 pandemic precedented year. In comparison to pre-COVID19 pandemic, almost 95%/year and 7%/year reductions of CO(2)e were recorded for both Scope 1 and Scope 2, respectively. Comparing Scope 1 and 2, it was obviously observed that the purchased electricity consumption (Scope 2) was the predominant contributor to GHG emission at UniMAP campus by 78% despite of current pandemic influence and its reduction was indistinct (7%/year reduction). Thus, the reduction target in future should be venturing in energy savings and energy auditing in addition to carbon offsetting.

关键词： Carbon footprint Greenhouse gases SDG 13 CO2 equivalent

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