This page contains information on archived research projects. Full reports are in PDF format.
RP 2 Volume 10 - Land Economic Studies - Project I-15-1(18)70 (Case Study No. 14) - Pocatello, Parcel 5 & 3/4's, Severance Study AbstractFinal Report
RP 2 Volume 10
The objective of these studies is to determine the impact, if any, of highway construction and operation upon the value of remainders of certain parcels of abutting private property from which right-of-way was obtained. In most cases, it was found that the remainder had been sold for prices far in excess of the appraised valuation at the time of the right-of-way purchase; in fact, even far in excess of the projected appraisal.
RP 2 Volume 12 - Land Economic Studies - Project F-1381(10) (Case Study No. 16) Blackfoot, ID Parcel #1 Severance Study AbstractFinal Report
RP 2 Volume 12
The objective of these studies is to determine the impact, if any, of highway construction and operation upon the value of remainders of certain parcels of abutting private property from which right-of-way was obtained. In most cases, it was found that the remainder had been sold for prices far in excess of the appraised valuation at the time of the right-of-way purchase; in fact, even far in excess of the projected appraisal.
RP 2 Volume 13 - Land Economic Studies - Project F-1381(10) (Case Study No. 17) - Blackfoot, ID Parcel 7 & 8 Severance Study AbstractFinal Report
RP 2 Volume 13
The objective of these studies is to determine the impact, if any, of highway construction and operation upon the value of remainders of certain parcels of abutting private property from which right-of-way was obtained. In most cases, it was found that the remainder had been sold for prices far in excess of the appraised valuation at the time of the right-of-way purchase; in fact, even far in excess of the projected appraisal.
RP 2 Volume 14 - Land Economic Studies - Project F-1381(10) (Case Study No. 18) - Blackfoot, ID Parcel #4 AbstractFinal Report
RP 2 Volume 14
The objective of these studies is to determine the impact, if any, of highway construction and operation upon the value of remainders of certain parcels of abutting private property from which right-of-way was obtained. In most cases, it was found that the remainder had been sold for prices far in excess of the appraised valuation at the time of the right-of-way purchase; in fact, even far in excess of the projected appraisal.
RP 2 Volume 15 - Land Economic Studies - Project I-15-1(19)61 (Case Study No. 19) Pocatello, ID Parcel 12, Severance Study AbstractFinal Report
RP 2 Volume 15
The objective of these studies is to determine the impact, if any, of highway construction and operation upon the value of remainders of certain parcels of abutting private property from which right-of-way was obtained. In most cases, it was found that the remainder had been sold for prices far in excess of the appraised valuation at the time of the right-of-way purchase; in fact, even far in excess of the projected appraisal.
RP 2 Volume 16 - Land Economic Studies - Project 1381 (10) Case study No. 20. Blackfoot, Idaho Parcel 4.5 Severance Study AbstractFinal Report
RP 2 Volume 16
The objective of these studies is to determine the impact, if any, of highway construction and operation upon the value of remainders of certain parcels of abutting private property from which right-of-way was obtained. In most cases, it was found that the remainder had been sold for prices far in excess of the appraised valuation at the time of the right-of-way purchase; in fact, even far in excess of the projected appraisal.
RP 24 Number 3 - Mixing Time Studies Using Ross Count Method, Larry Hippler AbstractFinal Report
RP 24 Number 3
The Idaho Department of Highways Standard Specifications for Highway Construction, 1967 Edition, gives the Engineer the responsibility of determining mixing time for plantmix paving. Prior to 1967, the specifications required a minimum finish wet mixing time of 30 seconds for batch plants. Continuous plantmixing time was controlled by the output in lbs./sec. This output was not to greater than the dead weight capacity of the pugmill in pounds, divided by 30. In May 1968, mixing time studies were undertaken using the Ross Count Test Method. The purpose of these studies was to determine the mixing times being used by the plants throughout Idaho, to determine the effectiveness of the mixing using the Ross count criteria and to determine a minimum allowable mixing time using the same criteria.
RP 26 - An Investigation of Nuclear Methods of Determining Moisture Contents and the Compacted Densities of soils and Aggregates, Fred Anderson & Jack Larsen AbstractFinal Report
RP 26
This report contains the results of laboratory and field testing of a portable nuclear gauge for the measurement of in-place moisture content and density of earthen structures. Both laboratory and field evaluations have been directed toward determining a practical and accurate method of test operation for application to control and inspection. It was found that the nuclear method of testing gave comparable results with conventional testing while being less complicated, quicker, safe and reliable, and reducing much of the human error connected with moisture-density determinations. It was recommended that additional field testing be conducted on a construction project before a final decision was made on additional purchases of the equipment.
RP 39 Progress - Field Maintenance Practices of the Idaho Department of Highways, G. W. Kennaly AbstractFinal Report
RP 39 Progress
The purpose of this investigation was to study field maintenance operations of the Idaho Department of Highways and to determine the variety of maintenance practices employed in performing each specific operation. The standards and levels of maintenance presently used for each major operation were also determined. A detailed questionnaire covering a variety of maintenance operations was used to obtain the data needed. Maintenance men responsible for the sections of highway selected for study were interviewed and their responses recorded. The 26,300 responses were compiled in statewide summaries of area foreman responses and maintenance men responses. The data analysis indicated that overall maintenance operations were performed in the same basic manner throughout the state and that no set basis was used in determining the standards and levels of maintenance. Even though a wide range of practices were reported for each operation, the number of responses comprising the extreme ends of the range was usually insignificant.
RP 39 Final - Idaho Highway Maintenance Study: Part I - Maintenance, Part II - Highway Maintenance Classification, Part III – Field Maintenance Practices. R. D. Mason, C. W. Hathaway & G. W. Kennaly AbstractFinal Report
RP 39 Final
The purpose of this project was to 1) determine how other states allocate money for maintenance and try to relate them to Idaho's past experience through computerized formulae and 2) to classify levels of maintenance and to study field maintenance operations as practiced by the Department. This study established for each major maintenance operation the standard and level of maintenance presently used by the majority of the Department's maintenance personnel. Of the eleven states that utilized a formula for allocation of maintenance funds, only six states sent formulae that could be programmed. It was indicated that the majority of states do not differentiate between the level of maintenance nor the standard of maintenance for different highway classifications. Results of the computerized formulae indicated that the allocation pr Idaho State Highway District should be in the same range, percentage wise, even though the formulae were based upon different criteria. The comparison of the results indicated that some inequities may exist in the present highway maintenance fund allocation system utilized by the Idaho Department of Highways.
RP 47 Phase I - The Moisture Mechanism that Causes Asphalt Stripping in Asphaltic Pavement Mixtures, Phase I, Robert P. Lottman AbstractFinal Report
RP 47 Phase I
The purpose of this project was to identify the moisture mechanism responsible for stripping in plantmix pavements. The ability of the asphalt binder to strip or detach from mineral aggregates in water-saturated asphaltic mixtures is a problem in many areas of the country. This report of Phase I consists of the results from preliminary testing of asphaltic mixtures from three Idaho projects. Conclusions were reached concerning the processes and causes of stripping. It was found that the use of compacted mixture specimens rather than loose asphalt-aggregate mixtures is a more direct approach because it more closely simulates field conditions. The results of the tests performed strongly suggest that internal tensile stresses occurring at the asphalt-aggregate interface greatly accelerate the stripping failure. Cyclic pore water pressures developed during the "dynamic tests" and static pressures developed during permeability testing have magnitudes approaching the tensile or adhesion strengths of the asphalt binders used in the mixtures. In most cases it was shown that mixture voids were proportional to the rate of stripping failure for a given mixture. However, it was also shown that voids are not an absolute parameter when considering different mixtures; permeability is more absolute. A decrease in permeability greatly increases the inhibition for stripping.
Skid testing of Idaho highway pavements was conducted July 1 to July 18, 1968 using the Bureau of Public Road's skid trailer. Most major routes of the state were tested bringing forcibly to the attention of those concerned that Idaho does have some very slippery spots on highway pavements. Most of these are of short length. It is quite evident from these tests that Idaho's aggregates are not "polishing aggregates"; the slipperiness is due to loss of chips or to flushing asphalt. Even though the Portland cement concrete pavements did not produce extremely low skid numbers, the average of all tests was slightly lower than the average for the plantmix or chip seal pavements.
