CONCLUSIONS These tests have proved that a very satisfactory asphaltic concrete can be made using Bitumuls HRM and ledge coral and coral beach sand. Where ledge coral is scarce a satisfactory pave- ment can be made using Bitumuls HRM and coral beach sand. A very small patch was made of this mix and looks very good. Where ledge coral is available and coral beach sand is scarce, a good open graded mix can be made using the ledge coral crushed and graded from 1 inch down to dust (crusher run) and mixed with Bitumuls HRM. As a general rule Bitumuls mixes will be more satisfactory than Bitumuls macadams. A Barber-Greene mixing plant is available and is an ideal unit for making Bitumuls mixes either as a central mixplant or as a travel mixer if it is pro- vided with an elevator. A very substantial amount of money can be saved by shipping Bitumuls to the job bulk in tank steamers instead of shipping in druns. Adequate floating storage is available. Floating storage is ideal for direct transfer in deep water from tank steamer and can be moved close to shore ‘at any desired location where the Bitumuls can easily be pumped to shore through a fire hose using a centrifugal pump. Since Bitumuls is asphalt emulsi- fied in water, it is always handled cold, it is easy to pump end presents no fire hazard. SURFACE TESTS The method of testing the surface of the test pavement sections was as follows: a 5 foot diameter circle was marked out on top of the Bitumuls mac- adam section and also the Bitumuls mix section, con- taining 6 per cent and 10 per cent of Bitwauls HRM, A transit was first used to establish the elevation at each circle. The actual test consisted of plac- ing a wooden tripod directly over the circle, and suspended under this tripod and exactly 24 inches above the pavement surface was a charge of 18 pounds of 60 per cent hi-pressure gelatin which was then exploded, S&ftanaktch-an observation was made of the damage done to the pavement area underneath. 5-286