Silty SandSoil with Clay BinderExisting Undisturbed Road AsphaltAvenue 288 Reconstruction Project – Construction Sequence Not to Scale
0. Existing Conditions
Silty SandSoil with Clay BinderExisting Undisturbed Road Pulverized Asphalt (New Base Layer)Avenue 288 Reconstruction Project – Construction Sequence Not to Scale
1. Pulverize Existing Asphalt to reuse as Base Layer
Base LayerGeogridSubgradeSilty SandSoil with Clay BinderCurrent Roadway SectionExisting Undisturbed Soil Avenue 288 Reconstruction Project – Construction Sequence Not to Scale
2. Prepare Subgrade & Place Geogrid
Base LayerGeogridSubgradeSilty SandSoil with Clay BinderRoadway SectionExisting Undisturbed Soil Avenue 288 Reconstruction Project – Construction Sequence Not to Scale
3. Place Asphalt
Asphalt
Base LayerGeogridSubgradeSilty SandSoil with Clay BinderCurrent Roadway SectionExisting Undisturbed Soil Avenue 288 Reconstruction Project – Construction Sequence Not to Scale
2.1 Pumping Roadway Encountered
Base LayerGeogridSubgradeSilty SandSoil with Clay BinderCurrent Roadway SectionExisting Undisturbed Soil Avenue 288 Reconstruction Project – Construction Sequence Not to Scale
2.2 Causes of Pumping – Heavy Loading & Saturated SoilWheel Loading Saturated SoilRising Water
Base LayerGeogridSubgradeSilty SandSoil with Clay BinderCurrent Roadway SectionExisting Undisturbed Soil Avenue 288 Reconstruction Project – Construction Sequence Not to Scale
2.3 Causes of Pumping – Clay Binder
Water held by Clay Binder
Base LayerGeogridSilty SandSoil with Clay BinderCurrent Roadway SectionExisting Undisturbed Soil Avenue 288 Reconstruction Project – Construction Sequence Not to Scale
2.5 Change Order Repairs – Digout Wet Materials & “Bridge” Over Saturated Soil Base LayerGeogrid
Base LayerGeogridSilty SandSoil with Clay BinderCurrent Roadway SectionExisting Undisturbed Soil Avenue 288 Reconstruction Project – Construction Sequence Not to Scale
3. Place Asphalt
Base LayerGeogrid
Asphalt
Before – No Setback
After – Setback in Progress