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Case Study of Subgrade Stabilization Using Fly Ash: State Highway 32, Port Washington, Wisconsin
This paper describes a case history where Class C fly ash, an industrial byproduct of electric power production, was used to stabilize a sandy clay highway subgrade so that a firm working platform could be provided for pavement construction. California bearing ratio (CBR), resilient modulus (Mr), and unconfined compressive strength tests were conducted on the soil alone and the soil-fly ash mixture to assess how fly ash improves the bearing resistance, stiffness, and shear strength of the soil. Field tests were also conducted during construction using a soil stiffness gauge (SSG) and a falling weight deflectometer (FWD) to assess the stiffness and modulus of the stabilized soil in situ. CBRs ranging between 46 and 150 were obtained for the stabilized soil after 7 d of curing, whereas the soil typically has CBR near 0 in its naturally moist condition (∼5% wet of optimum water content). Mr of the stabilized soil ranged between 11 and 28 MPa after 7 d of curing and between 17 and 68 MPa after 28 d of curing, whereas the unstabilized clay was too soft to determine its Mr using conventional methods. SSG tests indicated that the in situ stiffness of the stabilized soil ranged between 19 and 31 MN/m after 7 d of curing, whereas the unstabilized soil had a stiffness between 8 and 21 MN/m. Moduli computed from the stiffness measurements made with the SSG were in good agreement with those determined from the FWD data, but both were about 10 times higher than those from the Mr tests. Unconfined compressive strengths (qu) of the stabilized soil ranged between 276 and 607 KPa after 7 d of curing and between 304 and 683 KPa after 28-d of curing, whereas qu of the unstabilized soil was less than 200 kPa.
Case Study of Subgrade Stabilization Using Fly Ash: State Highway 32, Port Washington, Wisconsin
This paper describes a case history where Class C fly ash, an industrial byproduct of electric power production, was used to stabilize a sandy clay highway subgrade so that a firm working platform could be provided for pavement construction. California bearing ratio (CBR), resilient modulus (Mr), and unconfined compressive strength tests were conducted on the soil alone and the soil-fly ash mixture to assess how fly ash improves the bearing resistance, stiffness, and shear strength of the soil. Field tests were also conducted during construction using a soil stiffness gauge (SSG) and a falling weight deflectometer (FWD) to assess the stiffness and modulus of the stabilized soil in situ. CBRs ranging between 46 and 150 were obtained for the stabilized soil after 7 d of curing, whereas the soil typically has CBR near 0 in its naturally moist condition (∼5% wet of optimum water content). Mr of the stabilized soil ranged between 11 and 28 MPa after 7 d of curing and between 17 and 68 MPa after 28 d of curing, whereas the unstabilized clay was too soft to determine its Mr using conventional methods. SSG tests indicated that the in situ stiffness of the stabilized soil ranged between 19 and 31 MN/m after 7 d of curing, whereas the unstabilized soil had a stiffness between 8 and 21 MN/m. Moduli computed from the stiffness measurements made with the SSG were in good agreement with those determined from the FWD data, but both were about 10 times higher than those from the Mr tests. Unconfined compressive strengths (qu) of the stabilized soil ranged between 276 and 607 KPa after 7 d of curing and between 304 and 683 KPa after 28-d of curing, whereas qu of the unstabilized soil was less than 200 kPa.
Case Study of Subgrade Stabilization Using Fly Ash: State Highway 32, Port Washington, Wisconsin
Trzebiatowski, Bert D. (author) / Edil, Tuncer B. (author) / Benson, Craig H. (author)
Recycled Materials in Geotechnics Sessions at ASCE Civil Engineering Conference and Exposition 2004 ; 2004 ; Baltimore, Maryland, United States
Recycled Materials in Geotechnics ; 123-136
2004-10-01
Conference paper
Electronic Resource
English
Recycling , Tires , Highways and roads , Wisconsin , Construction , Construction materials , Sludge , Asphalts , Fly ash , Subgrades , Dredging
Case Study of Subgrade Stabilization Using Fly Ash: State Highway 32, Port Washington, Wisconsin
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