Geocells. Sundeep Inti Vivek Tandon
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1 Geocells Sundeep Inti Vivek Tandon
2 Need for Reinforcement Shortage of Good Quality Material Pavement Thickness Limitations Reduced Financial Resources
3 Presto Geocells Used Tenex
4 Laboratory Evaluation Plan (Soils) Two Subgrade Types Good (4.5 ksi) Poor (2.5 ksi) Three Base Types Good (15 ksi) Marginal (12 ksi) Poor (5 ksi)
5 Laboratory Evaluation Plan (Thickness) Subgrade Thickness 24 in. Base Thickness 10 in. Geocell Height 3, 4, and 6 in. Cover Thickness (7, 6 and 4 in.) Two Loading Plate Types (10 and 12 in.)
6 Laboratory Evaluation Plan (Box Dimension and Instrumentation) LVDT (vertical deformation) Cover Geocell Strain Gages c Subgrade Pressure Cells Box Size 3 by 4 by 5
7 Finite Element Modeling Geocell Cover Geocell + infill Load Geocell + infill Subgrade Quarter Model Section view
8 Typical Laboratory Test Results Stress (psi) Stress on subgrade (unreinforced section) Loading Rest Cycles No Geocell Stress (kpa) Stress (psi) Stress on subgrade (reinforced section) 8.5 psi (reduction) 8 psi (reduction) Cycles Geocell Base (9 ksi) Subgrade Base Cover (9 ksi) Geocell Subgrade Unreinforced compared with 6 Geocell and 4 Cover The stress on subgrade due to unreinforced section is 35% more than reinforced section Stress (kpa)
9 Comparison Between Laboratory and Finite Element Results Stress (psi) Loading Stress (kpa) Stress (psi) psi (reduction) Loading Stress (kpa) Base (9 ksi) Base Cover (9 ksi) Geocell Subgra de Subgra de Cycles No Geocell Cycles Geocell 0 10 Unreinforced compared with 4 Geocell and 6 Cover
10 Design Approach Back-calculation of Geocell Reinforced Layer using Stress Analysis Tool of FPS-21. Base (3 ksi) Cover 6 Base (3 ksi) psi psi Base (3 ksi) Cover 6 Geocell (? Ksi) 4 Base (70 Ksi) 4 Subgrade (4.5 ksi) Subgrade (4.5 ksi) Subgrade (4.5 ksi) Geocell Reinforced Unreinforced Base Equivalent Base Modulus
11 Design Using Equivalent Modulus - Paris District Lamar County, Paris District (2015 ADT 1450, 2037 ADT 2030) Surface Treatment (200 KSI) 0.5" HMA 500 KSI 3" Surface Treatment (200 KSI) 0.5" Surface Treatment (200 KSI) 0.5" HMA 500 KSI 3" HMA 500 KSI 3" CEMENT STABILIZED BASE (100 KSI) 7" FLEXIBLE BASE 30 KSI 12" FLEXIBLE BASE 30 KSI 6" GEOCELL BASE 48 KSI 4" SUBGRADE 9 KSI SUBGRADE 9 KSI 200" 200" SUBGRADE 9 KSI 196" Current Design Alternative 1 Alternative 2
12 Design Using Equivalent Modulus -Dallas District Ellis County, Dallas District (2017 ADT 1700, 2037 ADT 2400) HMA 500 KSI 3" HMA 500 KSI 2" FLEXIBLE BASE 40 KSI 8" HMA 500 KSI 2" HMA 500 KSI 2" FLEXIBLE BASE 25 KSI 20" FLEXIBLE BASE 40 KSI 10" FLEXIBLE BASE 40 KSI 12" CEMENT TREATED BASE 35 KSI 10" GEOCELL BASE 48 KSI 4" GEOCELL BASE 48 KSI 4" SUBGRADE 6 KSI 200" SUBGRADE 6 KSI 200" SUBGRADE 6 KSI 196" SUBGRADE 4.5 KSI 196" Current Design Alternative 1 Alternative 2 Alternative 3
13 Design Using Equivalent Modulus -Fort Worth District Tarrant County, Fort Worth District (2010 ADT 22990, 2030 ADT 33220) HMA 500 KSI 4" HMA 500 KSI 4" CEMENT TREATED BASE 120 KSI 6" HMA 500 KSI CEMENT TREATED BASE 120 KSI 4" 6" Cement Treated 120 KSI 15" FLEXIBLE BASE 30 KSI 20" FLEXIBLE BASE 30 KSI 8" GEOCELL BASE 48 KSI 4" SUBGRADE 4.5 KSI SUBGRADE 4.5 KSI SUBGRADE 4.5 KSI 200" 200" 200" Current Design Alternative 1 Alternative 2
14 Life Cycle Cost Analysis (Paris) Current Design Description Units Unit Price No of Lanes Thickness (in) Width (feet) Length (miles) Quantity (Yd.3 ) Total Cost Surface Treatment (200 ksi) CY $22,489 Hot Mix Asphalt (500 ksi) CY $134,933 Cement treated Base (100 ksi) CY $205,333 Subgrade (9 ksi) CY $156,444 Cost $519,199 Design With Geocell Description Units Unit Price No of Lanes Thickness (in) Width (feet) Length (miles) Quantity (Yd.3 ) Total Cost Surface Treatment (200 ksi) CY $22,489 Hot Mix Asphalt (500 ksi) CY $134,934 Flexible Base (30 ksi) CY $122,027 Geocell Base CY? ? Subgrade (9 ksi) CY $153,316 Alternative Cost $410,276 Difference Compared with Current Design $108,923 Geocell Cost Per Square Yard $8
15 Life Cycle Cost Analysis (Dallas) Current Design Description Units Unit Price No of Lanes Thickness (in) Width (feet) Length (miles) Quantity (Yd.3 ) Total Cost Hot Mix Asphalt (500 ksi) CY $82,459 Flexible Base (40 ksi) CY $160,616 Cement treated Base (35 ksi) CY $215,111 Subgrade (6 ksi) CY $143,407 Cost $601,593 Design With Geocell Description Units Unit Price No of Lanes Thickness (in) Width (feet) Length (miles) Quantity (Yd.3 ) Total Cost Hot Mix Asphalt (500 ksi) CY $82,459 Flexible Base (30 ksi) CY $200,771 Geocell Base CY? ? Subgrade (4.5 ksi) CY $140,359 Alternative Cost $423,769 Difference Compared with Current Design $177,824 Geocell Cost Per Square Yard $14
16 Site Selected for Implementation -Paris (Texas)
17 Pavement Sections
18 Instrumentation Unreinforced Section
19 Instrumentation Reinforced Section
20 Soil Removal
21
22 Installation Help
23 Geocell Spreading
24 Final Geocell Layout
25 Geocell Infill Process
26 Unreinforced Section
27 Reinforced Section
28 Deflection of Spot 3 0 D1 D2 D3 D4 D5 D6 D Deflection (mils) Non-Geocell Geocell -90
29 0 Deflection of Spot 5 D1 D2 D3 D4 D5 D6 D7-10 Deflection (mils) Non-Geocell Geocell -70
30 10/11/2018
31 Conclusions Use of Geocell Reduced Stress on Top of Subgrade Layer Pavement Can be Designed with Lower Quality Base and Subgrade Material and Still Reduce Overall Thickness of Pavement System Life Cycle Cost Analysis (LCCA) Suggests Lower Overall Cost of Construction Sustainable Solution to Material Problem
32 Thanks TxDOT for the Support??????????
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