The physical testing of rock for road building : including the methods used and the results obtained . al togood results. Further than this,the hardness and toughness of thebinder surface, more than of therock itself, constitute the hardnessand toughness of the road, for ifa load be sufficient to destroy thebond of cementation of the uppersurface of the road, the stones be-low are soon loosened and forcedout of place. The impervious shellobtained by the use of a rock of highcementing value gives the greatestprotection to the foundation of aroad. Moreover,, it is a matter ofcommon observation t
The physical testing of rock for road building : including the methods used and the results obtained . al togood results. Further than this,the hardness and toughness of thebinder surface, more than of therock itself, constitute the hardnessand toughness of the road, for ifa load be sufficient to destroy thebond of cementation of the uppersurface of the road, the stones be-low are soon loosened and forcedout of place. The impervious shellobtained by the use of a rock of highcementing value gives the greatestprotection to the foundation of aroad. Moreover,, it is a matter ofcommon observation that a goodsurface which binds well is lessdusty and less muddy, while theadvantage from the standpoint ofeconomy is very great, as it is onlythe loose, unbound material whichis ordinarily carried away by windand water. 1 aia X* 1 U. S. Department of Agriculture, Bureau of Chemistry, Bulletin-7§,-Bull. 44—12 2 32910c 18 PHYSICAL TESTING OF EOCK FOE EOAD BUILDING. Investigations in the U. S. Bureau of Chemistry indicate that thecementing value depends on certain hydrated colloid conditions of the. FRONT VIEW. ?!%?? B! EACH CYLINDER, 20 CM. IN DIAMETERAND 34 CM. IN DEPTH. /3#- - b: S/DE V/EW OF CYLINDER.
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Keywords: ., bookauthorunitedst, bookcentury1900, bookdecade1910, bookyear1912
