Concrete Roads
and Their Construction

CHAPTER VII CONCRETE KERBING Concrete kerbing and channelling have been used extensively in many of our counties, and the practice adopted by surveyors in Surrey, Brighton and Aylesbury, may serve as a useful guide as to the method for making kerbs of concrete. Aylesbury. Mi. H, laylor, Borough Engineer and. Surveyor of Aylesbury, gives the following account of concrete kerbing in his district:— The Aylesbury Corporation have made concrete kerb and chan- nelling for the past eight years. The kerbs are 5 in. by 10 in. by 3 ft. long, and the top face is chequered to give a good foothold. At the commencement the kerbs were cast in wood moulds, but after a time the moulds became warped and iron moulds were obtained. The channel-blocks are 9 in. by 4 in. by 15 in. long, and the upper face is slightly dished. They are cast in wood moulds face down- wards. The materials used for making both the kerb and channel- blocks are one of Portland cement to three of Clee Hill granite chippings I in. to dust. In mixing the materials, great care is taken, as it has been found from experience that this is most essential, or the results are not so good. The aggregate is measured and well mixed with the cement both before and after the water is added. As the moulds are being filled the material is rammed gently by means of a small wood rammer, and if this is done a good surface is obtained. Many thousand yards have been laid and the first length is still excellent. 168