ee Per Cent Passing 1/4" 54 eon »" #10 51 eon " £10 16 non » #80 2 ® uw #200 1 A The correct amount of Bitumuls HRM for the above blend is 8 per cent which, for astimating purposes, equals .8 gallon per square yard per compacted inch of thickness, and for batching purposes in the mix- pot equals .8 gallon per cubic foot loose of the aggregate blend. For sand mixes only using the coral beach sand the correct amount of Bitumuls HRM to use is 10 per cent which, for estimating purposes, equals 1 gallon per square yard per compacted inch of thick- ness, and for batching purposes 1 gallon per cubic foot loose of the coral sand. Conclusions If an ideal blend of aggregates is desired, this could be achieved by blending 40 per cent of the ledge coral of the above gradation with 40 per cent of the coral beach sand, and with 20 per cent of the crusher dust produced at the rock plant as a byproduct of the crushing operations of the ledge coral. The above laboratory study clearly discloses that the ledge coral ia perfectly satisfactory for making Bitumulis mixes in combination with the coral beach sand, or if necessary it could be used as a straight crusher run without the addition of sand. The coral beach sand is unusually good and if desired, could be used exclusively for a Bitumuls sand mix for any type of paving and would give very satisfactory results. On the basis of the above tests and analyses, the decision was reached by H & N engineers that the use of Bitumuls for paving purposes at Eniwetok Atoll had many advantages and warranted thorough study to determine the best design mix to be used in the evaluation of the various materials proposed. As a result of this decision an engineering expert with many years experience in the asphalt field and a broad knowledge of the characteristics of coral aggregate when used with asphaltic binders for pavement was selected to inspect the test strips on Parry Island and report his findings. His conclusions and general remarks were as follows: 5-285