The age-herald., 1901-12-26
City Engineer Kendrick Going to Charleston to Witness
 Practical Demonstration
MOST DURABLE MACADAM
It Has Worn We'll In Washington and Other Cities, and It May Be That Birmingham
 Will Use lt.

There is a probability of some of the | streets of Birmingham being paved with asphalt.
 Mir. Pardon S. Kaull, representing War ren Brothers Company of Boston, manu- lecturers of Warren's Bituminous Maca- dam Pavement, has been in the city sev- eral days consulting with City Engineer Kendrick regarding the asphaiting of the streets of Birmingham with paving of their manufacture.
 In Successful Operation.
 The bituminous macadam made by this concern is a combination of stone with a bituminous cement, which in isolated cases even under haphazard methods, has been in successful use in street pave ments for more than a quarter of a cen tury, a notable example being Massachu- setts avenue, Washington, D. C., laid in 1873, and now In good repair, regarding which Prof. A. w. Dow, United States Government Inspector of Asphalts and Clements at Washington, certihes that it has cost less than 1 cent per square yard per year for repairs since the pavement was laid 2S years ago. In Chicago and other cities there are small sections of similar pavements laid over twenty years ago. The pavement in the roadway around the United States Government ap- praisers' building, Chicago. laid with the same m material in 1SSS was in perfect con- dition, after thirteen years use, when taken up this year. for regulating the grade necessitated by settlement of the building
 The Process.
 The construction of the pavement is briefly described as follows: The founda- tion consists of four inches of crushed stone laid and rolled in the same manner as ordinary macadam. Over this is spread two layers of bituminous cement, foundation and uniting it to the wearing surface. The wearing surface. which Is two Inches thick. contains all the ingre- dients of a stone macadam surface, f. e., stone varying in size from about two inches to fine powder. The particles of stone are carefully proportioned as to size to give the greatest possible density and least voids, and are heated and mixed by machinery with the bituminous cement. The mixture Is then hauled to the street and while still hot spread on the foundation so as to give uniform thickness and grade, and rolled with a heavy steam road roller. The roller used here weighs sixteen tons.
 The pavement when completed presents a surface similar to and affording the foothold of macadam. but the particles of stone are held together by bituminous cement similar to the ordinary asphalt pavement. which Is made of sand and bitumen.
 The Advantages.
 Asphalt is bituminous mortar pave ment (bitumen and sand). Bituminous macadam is a bituminous concrete (bitu- men. sand and hard stone). It therefore combines the advantages of asphalt and macadam. and overcomes most of the objections to each, such as: First, Slip periness and liability of the asphalt to crack and disintegrate: second. the mud, dust. rapid wear. washing out and un- sanitary features of the macadam
 In addition, 1t gives a more solid and dense and. therefore. more waterproof and durable wearing surface than either asphalt or macadam.
 Mir. Kendrich is much interested in this asphalt question and will accompany MT. Kauii to Charleston. S. C., tomorrow where he will be joined by representa- lives of at least half dozen Southern cities to witness a practical demonstra- ton of the working of this paving pro- cess.