Presentation on theme: "NATIONAL JUTE BOARD (PEA)"— Presentation transcript:
1 NATIONAL JUTE BOARD (PEA) ECONOMICAL & ENVIRONMENTAL ADVANTAGES OF USING JUTE GEOTEXTILE IN RURAL ROAD, RIVER BANK PROTECTION AND HILL SLOPE MANAGEMENTPresented byNATIONAL JUTE BOARD (PEA)
2 CONTENTSECONOMICSLow Volume Road ConstructionRiver Bank ProtectionHill Slope Management2. ENVIRONMENTAL ASPECTSLife cycle assessment of jute productEco-compatibility & Socio-economic values of jute
3 JGT in Road Construction JGT or all GTs act as change agents triggering the consolidation process and gradual development of effective stress.In all cases JGT treated Sub-grade happens to enhance CBR by 150 – 300% over control value.Reduced base course thickness (due to increased CBR) offsets cost of JGT.Scope of savings in initial construction [ based on Handbook of ‘Geosynthetics case studies by Indian Technical Textiles Association (ITTA)]
4 JGT in Road Construction The following results are revealing -Source – Ramaswamy & Aziz(1989)Source – A Sreerama Rao (2003)5.0822.214.171.124.24.76.8b) CBR (%)i) without JGTii) with JGT353025a) Water Content (%)Natural Soil CBR (%)Improved soil CBR (%)Unsoaked specimen2.10Soaked specimen1.616.034.78
5 Assumptions For Computation of Initial Construction Cost – CBR of sub-grade soil : 3 – 4 %Considering Enhancement of CBR of sub-grade soil by 1.5 times : 5 – 6 %Cumulative Traffic ESAL : 60,000 – 1,00,000Length of Pavement : 1000 mCarriageway Width of Pavement : 3.75 mRoadway Width : 7.5 mWidth of JGT with 10% overlapping : 5.5 mCross-section of pavement as per guidelines mentioned in IRC:SP:CBRITEMS3 – 4 %5 – 6 %WBM – II75mmWBM – IIIGSB – IIIGSB-II/Sand100mm50 mm
6 CONVENTIONAL METHOD (Table 1) LOW VOLUME ROAD CONSTRUCTION - ECONOMICSRate Analysis of Base Course -Rates are as per WBSRDA 2012, Murshidabad District. Sub-base layer consists of well graded material (sand-laterite Gr- II and stone grit & sand Gr-III)CONVENTIONAL METHOD (Table 1)S.No.DESCRIPTION OF ITEMSLENGTH(m)WIDTHTHICKNESSQUANTITY(m3)RATE(Rs.)AMOUNT1.GSB – II10008.80.188013002.GSB – III4.050.075303.7520006075003.Total
7 WITH JUTE GEOTEXTILE (JGT) (Table 2) LOW VOLUME ROAD CONSTRUCTION - ECONOMICSWITH JUTE GEOTEXTILE (JGT) (Table 2)S.No.DESCRIPTION OF ITEMSLENGTH(m)WIDTHTHICKNESSQUANTITY(m3)RATE(Rs.)AMOUNT1.Coarse Sand below JGT10008.50.025212.56501381252.Woven JGT5.5-5500703850003.Coarse Sand above JGT137.5893754.GSB – III4.050.075303.7520006075005.Total
8 LOW VOLUME ROAD CONSTRUCTION - ECONOMICS Procedure For Cost Quantification -STEP 1 Quantify Cost of Base Course MaterialGSB – II : Rs / m3 (Rs. 1.3/ mm thickness/ m2 of pavement)b) GSB – III : Rs / m3(Rs. 2/ mm thickness/ m2 of pavement)JGT : Rs. 70/ m2STEP 2 . Thickness Reduction, ∆tr = 50 mmSTEP 3. Construction Cost savings - CCS/m2= ∆tr (a+b) – c= Rs. 95/ m2STEP 4. Construction Cost savings - CCS/ lane – km= 85 x 1000 x 3.75= Rs / lane – km
9 Base Course Cost Savings (%) = 20 % LOW VOLUME ROAD CONSTRUCTION - ECONOMICSBase Course Cost Savings % == x 100Application of JGT in road construction is economical as there is –Base Course Cost Savings (%) = 20 %20 % reduction in cost of base course.16 % reduction in thickness.
10 JGT in RIVER BANK PROTECTION Factors driving river bank erosion arePresence of erodible bank soil,Fluctuation in water level, andDevelopment of differential overpressure during drawdown.Role of JGT in River Bank ProtectionEnsures better relative density or tightness of bank soil by retaining soil particles (separation).Permittivity and transmissivity functions of JGT allows water to pass across without developing uplift pressure.Acts as a catalyst in developing natural graded filter (filter cake) by interaction with soil bed.Conventional inverted filter consist of bulk of materials (thick filter )which belong to different grades and consumes lots of money and time.Thick granular inverted filter can be replaced by JGT, thereby conserving materials, time and money.
11 RIVER BANK PROTECTION - ECONOMICS Assumptions for Computation of riverbank construction savings –Total Length of protection work = 1kmLength of Slope of protection work = 15 mThickness of conventional graded inverted filter = 125 mmQuantity of JGT required for total length of protection work = m2Thickness of riprap/armor (boulders of 30/45 kg) = 300 mmThickness of JGT = 2 mm Slope Length = 15m
12 RIVER BANK PROTECTION - ECONOMICS The rates are derived from SoR, Eastern Circle, I & W Directorate, Oct 2009 inclusive of transportation to the site location with 30% hike in rates as on date are considered.TypeQuantityConventionalWith Jute G.TRateAmount (Rs.)Amount (Rs.)Filter Layera) Graded inverted filter 125mm thickb) Jute Geotextilesc) Boulder 30/45 kg300 mm thick riprap1875 m315000 m24500 m382.00TotalRs≈Rs. 885/m2Rs≈Rs. 710/m2
13 use of JGT in river bank protection works is economical as there is – RIVER BANK PROTECTION - ECONOMICSConstruction Cost Savings/m2 (%) = x 100= x 100use of JGT in river bank protection works is economical as there is –20% reduction in cost.Construction Cost Savings/m2 with JGT = 20 %
14 Surficial run-off causes due to JGT in HILL SLOPE MANAGEMENTSurficial run-off causes due toStrong winds, andImpact of RainfallJGT controls hill slope erosion by following mechanismProviding a protective cover to exposed soil surfaceAbsorbs a large part of kinetic energy of rain dropsAperture of JGT acts as successive miniature check dams on slopesReduces the velocity of run-offProvides overland storage.
15 HILL SLOPE MANAGEMENT - ECONOMICS Typical cost comparative analysis has been done between different GTs. for Restoration of Mine spoil – 500 m X 25 mN.B Rates of fabric are as per prevailing market rateTypeQuantity (m2)With Synthetic GT.With Coir GT.With Jute GT.RateAmount (Rs.)Synthetic GT.Coir GT.Jute GT.1250080.0040.0025.00TotalRsRsRs
16 69% reduction in cost of fabric from SGT HILL SLOPE MANAGEMENT - ECONOMICSPercentage Savings of Cost of Different Fabric as compared to Jute Geotextile (JGT) -Savings from SGT(%) = x 100= %b) Savings from Coir GT (%) = x 100= 37.5 %From above, it can be concluded that use of JGT in hill slope management is economical as there is –69% reduction in cost of fabric from SGT38% reduction in cost of fabric from Coir GT
17 LIFE CYCLE ANALYSIS OF JUTE Life Cycle Assessment (LCA) denotes the systematic analysis of environmental impact of products during their entire life cycle (extraction and treatment of raw materials, production, distribution and transport, use, consumption and disposal)Retting of jute plantJute sticks as substitute of fireJute Fibre ProductionJute Products & its wasteBio- degradable materialSoil- enrichmentJute cultivationCO2 assimilationPollutionResidue
18 LIFE CYCLE ANALYSIS OF JUTE The Life Cycle Analysis of jute products especially mentions the following (Jan E.G. van Dam and Harriëtte L. Bos, 2006):Total of kg CO2 emission per ton of jute, while 2.4 ton CO2 is fixed from the atmosphere by growing jute. A positive balance of ton CO2 per ton of jute fibre produced. Life cycle impact (LCI) analysis jute can be classified more environmentally friendly than PPJutePPRatio (PP/Jute)Waste produced (tons of Waste/tons of product)0.95.56.1Water Consumption per ton of product(m3)54 to 811.30.016 to 0.02Energy Consumption per ton of product (GJ/t)5.4 to 14.3584.35.9 to 15.6CO2 emission (tons of CO2/tons of product)- 1.2 to 03.7 to 7.5-Embodied Energy (MJ / kg)3.75 to 8.0264 to 84.317.06 to 76.28
19 Quantification of diesel consumption LOW VOLUME ROAD CONSTRUCTION – ENVIRONMENTAL ASPECTSDelivering materials to site = Consumes Fuel + Depletion of natural stones = Carbon emission as well as depletion of non-renewable resource like diesel and natural stonesQuantification of diesel consumptionDiesel consumption depend on various factors like their laden weight, driving speed, congestion in roads, tire pressure etc.Considering a truck consumes 6km/l diesel and distance between quarry site to construction site as 50km.Capacity of Punjab Body Truck = 14 m3Volume of saved quantity of 50 mm GSB for 1 km and 8.8 wide = 440 m3Number of trips required for carrying 440 m3 of GSB to site = 32Number of trips required for carrying JGT to site = 1
20 JGT will save 259 litres of diesel for 1 km road construction LOW VOLUME ROAD CONSTRUCTION – ENVIRONMENTAL ASPECTSEffective savings will be in terms of diesel consumption will be = 31 trips of truck .Diesel consumption for 31 passes = 259 litresb) Quantification of natural resources consumption –less hauling of granular material will result in significant fuel savings and emissions reduction.For 50mm reduced thickness with JGT application, quantity of aggregate conserved = 440 m3 which reduces both costs and use of scarce resources.JGT will save 259 litres of diesel for 1 km road construction
21 c) Quantification of vehicular emissions – LOW VOLUME ROAD CONSTRUCTION – ENVIRONMENTAL ASPECTSc) Quantification of vehicular emissions –Emissions quantified based on number of vehicles and distance travelled is given by (Gurjar et al., 2004)Ei = x Ei,j,kmwhere, Ei = Emission of compound, Veh = No. of vehicles of each typeD = Distance travelled from quarry to site = 50kmEi,j,km = emission of compound from vehicle per driven kilometer = gm/km of CO2 from trucks (Mittal and Sharma, 2003)Ei = 31 x 1 x 50 x = 798kg of CO2 is emitted in 31 tripsCarbon Emissions can be reduced by incorporating JGT at the interface of base course and sub-grade level.
22 RIVER BANK PROTECTION – ENVIRONMENTAL ASPECTS a) Quantification of diesel consumptionConsidering a truck consumes 6km/lt of diesel and distance to site location is 50 km.Volume of saved quantity of 123 mm filter thickness for 1 km and 15 m wide = 1845 m3Number of trips required for carrying 1845 m3 of granular layer to site = 132JGT transportation will require = 2 trips of truckEffective savings of 130 trips of truck = Diesel conserved = 1085 litresJGT will save approx lts. of diesel per 1000m of river bank protection work
23 b) Quantification of natural resources consumption – RIVER BANK PROTECTION – ENVIRONMENTAL ASPECTSb) Quantification of natural resources consumption –For 123 mm reduced thickness with JGT application, quantity of aggregate/ natural resources conserved = 1845 m3 which reduces both costs, use of scarce resources and carbon emissions associated to quarrying.c) Quantification of vehicular emissions –Emissions Ei = 130 x 1 x 50 x = 3350 kg of CO2 is emitted in 130 trips (that will be conserved using JGT)Carbon Emissions can be reduced by incorporating JGT at the interface of bank soil and boulders.
24 Acts as mulch on its degradation HILL SLOPE MANAGEMENT– ENVIRONMENTAL ASPECTSActs as mulch on its degradationResidue of fibres left in the soil ultimately enhances its hydraulic conductivityJGT can absorb water about 5 times its dry weight creating congenial micro-climate ensuring quick growth of dense vegetation.Root-system of vegetation ensures soil detachment and imparts strength to soil bodyJGT- natural product-fosters vegetation growth and paves way for bio-engineering solution to soil erosional problem.
25 b) Bio-efficiency of jute ECO-CONCORDANCE AND SOCIO-ECONOMIC VALUES OF JUTEPurification of airAbout 1.2 kg of CO2 is absorbed from atmosphere per every kg of fibre produced.b) Bio-efficiency of juteUsage of jute in place of wood to make paper pulp will reduce cost of production and cutting down of trees that will help in preserving ecological balance.c) Fertility of LandDry matter in the form of leaves and roots remain in soil which enhances soil organic matter and improves nutrient availability in soil. Thus jute base multiple cropping increases agricultural production.d) Improvement in EconomyJute cultivation creates direct employment to farmers, industrial workers and indirect employment to workers associated with ancillary industries. Thus helps in economical upliftment of nation.