En Samling Afhandlinger Om Veje 1876-1881

14 OUR ROADWAYS. the longitudinal joints being kept three-quarters of an inch apart by a fillet (which is nailed to the floor- ing) and the heading joints butting. The joints from the fillet up to the surface of the road are filled in with fine ballast, run with a liquid tar, and caulked with a machine made for the purpose: the road is then strewn lightly with small gravel and is ready for use. The principal advantage claimed for this system is that the flooring of planks forms an elastic foun- dation and tends to distribute the weight equally over the whole pavement, while the additional elas- ticity will lessen the wear of the blocks. The Asphaltic Wood Pavement.—The mode of laying this system of wood paving is as follows, viz.: A concrete foundation, composed of blue lias lime and ballast in proportions of one part of lime to five or six parts of ballast, is laid to a thickness of 6 in. and to the correct curve of the road. Over this is laid a layer or bed of mastic asphalte half-an-inch in thickness, upon which wood blocks are placed in transverse courses with the grain of the wood up- wards, a space of half-an-inch (or more if desired) being left between each course. Into these spaces, or joints as they are more usually called, heated asphalte is poured to a depth of from 2 to 2 J in. up the block. This asphalte adheres firmly to the 5 asphalte layer or foundation, as well as to the blocks, thus solidifying the whole, and the remainder of