A limited supply of high quality base aggregates in several parts of Minnesota has resulted in a search for a means of improving the physical and strength characteristics of locally available soils and poor quality granular materials. Other states faced with a similar problem have attempted to use soil stabilization as a solution. Common stabilization agents include cement, bituminous materials, sodium and calcium chloride, and sulfite liquor. More recently, several southern states have successfully used lime for stabilization of roadbed materials.
The purpose of this study is to determine the effect of hydrated lime on the physical and strength properties of typical Minnesota soils and aggregates. This first progress report presents the findings of tests conducted during 1961 using hydrated lime and five secondary chemical additives with five fine grained soils
This investigation was included in the research program of the Minnesota Local Road Research Board as a project of special interest to County and Municipal Engineers as well as to Engineers of the Minnesota Highway Department. The project was conducted as a part of the Highway Planning Research Program financed jointly with Federal-Aid funds provided through the United States Department of Commerce, Bureau of Public Roads together with State funds and County and Municipal State-Aid funds.
A laboratory study such as this generally does not provide all the information necessary to determine whether a particular method will prove satisfactory as a construction procedure or to accurately predict field performance. This laboratory study does show that lime has some possibilities as an effective treatment for certain Minnesota soils. However, an experimental field project is needed to establish the suitability of the various laboratory tests as a means for evaluating the adequacy of the soil-lime mixtures for use in road structures.
The goal of this research project is to study a road base at the Minnesota Road Research Facility (MnROAD) constructed with high carbon fly ash for long term monitoring of engineering and environmental characteristics. This study will provide a controlled long term evaluation of pavement base materials stabilized with High Carbon Fly Ash
(HCFA). Engineering laboratory testing has shown HCFA to be a viable stabilizing material. Field construction of road test segments is necessary to validate the structural and environmental performance of high carbon fly ash stabilized bases.
This report concerns the results of ongoing environmental chemical analysis of leachate collected from test cells using off-classification HCFA as a stabilizer of road base materials under an asphalt wearing course. This research opportunity is a portion of Phase II of a fly ash stabilization project performed by Bloom Consultants, LLC and is sponsored by the Department of Energy (DOE). The University of Wisconsin-Madison (UW) is a subcontractor of Bloom Consultants and is conducting ongoing evaluations as the project proceeds. Phase II is titled Use of High Carbon Fly Ash to Stabilize Recycled Pavement as Base Course, has a two-year time requirement, and will involve the proposed MnROAD test sections to be constructed in 2007.
Accelerated soil erosion and the sedimentation caused by it pose serious problems for the construction industry and state and local agencies. Runoff from construction sites has high sediment loads which may contain various pollutants, including oil, chemicals, and soil wastes. Natural erosion in ditches and along roadways may result in sedimentation that may result in costly damage to water and land. Drainage channels, culverts, and storm sewers may be filled and plugged by sediment, resulting in frequent and costly maintenance.
This report addresses those problems and outlines methods for controlling erosion both during and after construction. Structural and vegetative practices for reducing sedimentation are given, and turf establishment techniques for native grasses and wildflowers are discussed. Information regarding the National Pollution Discharge Elimination System (NPDES) Storm Water Permit Requirements is also given.
This report was developed to assist local engineers and engineering staff with problems associated with slope failure and reinforcement. Reinforcing or repairing backslopes on highways can be a difficult problem for local engineers and maintenance staff. Soil nailing is one technique that can be used to reinforce and strengthen existing ground. It involves placing closely spaced grouted steel bars (nails) into a slope or excavation to reinforce the soil. The grouted nails increase the shear strength of the soil and limit displacement during and after excavation. A structural facing connected to the nails is used when the slope angle exceeds a critical value, or when environmental conditions may cause deterioration of the exposed soil face over its design life.
The objective of this document is to summarize and document the technique and appropriate use of soil nailing technology.
This Technical Summary pertains to the LRRB-produced Report 2017-17, “Slope Stabilization and Repair Solutions for Local Government Engineers,” and Report 2017-17G, “Slope Stabilization Guide for Minnesota Local Government Engineers,” both published June 2017.
This user guide provides simple, cost‐effective methods for stabilizing locally maintained slopes along roadways in Minnesota. Eight slope stabilization techniques are presented that local government engineers can undertake using locally available materials and equipment. These methods are the result of a research effort that analyzed recent slope failures in Minnesota. The recommendations are based on input from Minnesota county engineers; case studies from site investigations within the state; and slope stability analysis, including limit equilibrium methods. This guide is based on information provided in Slope Stabilization and Repair Solutions for Local Government Engineers, which presents the results of a Minnesota Local Road Research Board research project on slope stabilization methods. Detailed information about the research project along with complete descriptions of the field sites is available in the report. Local government engineers are encouraged to reference the report when using this guide.
This Technical Summary pertains to the LRRB-produced Report 2014-06, “Research Using Waste Shingles for Stabilization or Dust Control for Gravel Roads and Shoulders,” published January 2014.
