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Introduction
This report covers work carried out from January - August, 1964.
The work has largely consisted of further tests with the Cranfield
reflectivity equipment and associated measurements of pull-off strength,
but a brief assessment has also been made of an instrument for measuring
reflectivity developed by the Paint Research Station. A number of
miscellaneous tests are also reported. The final months of the period
covered by the report have been spent in the design and construction of
a new reflectivity instrument which incorporates features that the
previous instruments have shown to be desirable'.
Particular topics reported cover the effect of grit size and
blasting time, and also a determination of the effect of using light
sources of specific colours instead of white light. Much of this work
has been done at laboratories and works away from Cranfield to allow
external assessment of the reflectivity equipment. A number of
miscellaneous tests have also been made covering the use of non-metallic
grits and 'Jasonl type hammers for surface preparation, the assessment
of sprayed coatings by a simple bend test and the examination of the
variation of strength with time of two adhesives to determine whether
an adhesive could be used for practical site testing of sprayed coatings. |
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