The results of this investigation to date indicate that the stabilometer may be a very useful tool in the evaluation of Minnesota soils and aggregates. However, the method of applying the results of the test to the design of flexible pavements still has to be established. This remaining problem is undoubtedly the most difficult and will be the third phase of Investigation No. 176
This report evaluates the stabilization of fine sand with asphalt emulsion as constructed on TH 65 near Johnsville. The report covers the design and construction problems and strength evaluations up to October, 1960
This investigation was begun in 1951 for the purpose of evaluating selected bituminous-surfaced highways by means of the plate bearing test. It was continued through 1952, 1953 and 1954' without significant change in procedure or purpose.
In 1955 this program was interrupted by other research work and has no-t been resumed as a controlled investigation. However, nearly every year there were requests for plate bearing test data on a number of trunk highways for various purposes, and this information has been assembled in supplementary reports to Investigation No. 161. The purpose of this supplement is to report the miscellaneous plate bearing test data accumulated during 1958 and 1959.
The attached report covers the work which has been in progress since 1955 to determine whether Minnesota concrete aggregates
have a detrimental reaction with the alkalis present in Portland Cement. It has been found by extensive research elsewhere that, when such reaction does occur, it may produce volume changes of the concrete thus causing internal stresses and consequent disruption of the concrete
This study was prompted by the occurrence of extensive "D" cracking and subsequent serious spalling at many of the joints in the 1941 experimental concrete paving project between Worthington and Brewster. It was suspected that the deterioration of the concrete might have been caused lay alkali-aggregate reactivity,
The results of this study indicate that alkali-aggregate reactivity was not a contributing factor on the experimental project and probably will not occur with any Minnesota concrete aggregates.
