details of deflection-temperature relationships are given for bituminous surfacings up to 150 mm thick on kenya roads. on some sites plastic deformation of the bituminous surfacing was identified during deflection tests at relatively low temperatures. however valid deflection measurements could be obtained on other sites at surfacing temperatures up to 60 deg c. hardening of the bitumen in the surfacing was monitored and found to have a significant effect upon deflection-temperature relationships. no general corrections for deflection-temperature relationships could be formulated because the relationships vary even within 100 m long sections of road. it is concluded that it is necessary to undertake deflection-temperature tests when carrying out deflection surveys on roads containing bituminous materials in tropical environments.(a)

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