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Show rpiT PIILBII Ipid of University riy Modern Mcth-fcstructioii. Mcth-fcstructioii. A KAVELS AND l pISCUSSED I i in Utah Can Be m After Careful rjmeiifs. IKkstrand of tho Unt-KRscnsspd Unt-KRscnsspd the various JR. building beforo tho ..IMiinn Thursdn-. Prof. Up tho subject from n HlVas a practical stand-;'Shat stand-;'Shat certain material XiMa certain cases, but 41 Inns, Buck as haulage. imp' ln decision ftjBp'ckatrand's paper, in ' JBSls subject to the ;Srw of economics as . jWticTP. tho structure is jMr material, which also fctrll)utcd so that over-ljMJTCSult. over-ljMJTCSult. It Is. thcrc-$Ksa- good knowledge of ;Bic, material from which build must ho had. Tho 'iwono 'will yield to, tho 11 can resist without rfejatono will resist the '.jKences'Of the atmos-JptHtUB atmos-JptHtUB worn from the .aHprlll rcccment and re-jHjoldlng re-jHjoldlng other stone ln Hfoslrig them and not iRablc -mud these aro iWfc know about all the iaKjr which are available ' tp. geologic map of the i i51ocat(on of available Khe useful information - :"R?and' kind of stone, JSfa genenil knowledge Mul to ns alK vjMbh Roads. ' on roai,R nerds but '-'B'ho larger varieties !qually good for road . ' Wlpack well on the sur-an sur-an not. (gravel is an Rmo varying ln size -"Bfe'sizc of one's fist. If uBdy proportioned, there II IK fine material to fill I'lHmrscr. There should QUHuvpcr kind of clay to - Bid hokl them in place. IK'nBf allowing the mass ill WKflthcr. forming a mud. U IM& "work to the surface, INBevcn Tho largest size "T'Ks given by Professor 4Bec-fourlhs of an inch Cftlargcst size and then 'fjUsand. Gravel usually iiflBieli to carry heavy haTd matcrfnl which WKar of the water for an Jjfjjf. time. Gravel does foundation for a road, Hmc a good wearing sur-fcwvllh sur-fcwvllh broken stones, and 'iWy' distributed in the jg&nt Lake Bonneville. Wfc streams that flowed HflBfereat deltas of gravel 4fcKilleys uiid widely dls-SjoVcr dls-SjoVcr the stale. 3uokcn Stone, Ktllstrluts. most any of JHwnlch aro found there, JB'iupon the road, will iwlti especially If the gBroperly graded before- '.naJorily of cases, the Impleading, Into cities from Heading from one city to, ,yKnovcred with and sur-.iWstone sur-.iWstone of different sizes, Ssufflclont to cany the ysK. construction Is usu-Ppi usu-Ppi pavement. It Is the p'giwMn'okcn stone, when li0B,-.umlcr the influenco of 'he different kinds of jyor it, that we wish to )MKile Intelligent sclee-im sclee-im Pso In Utah after fted wllh a great deiil JBonc. If a committee VfjBnppolntori to gather iJstcnlc that may be ipllnRr and make tests gMiulate their .results. IHcq of a stone for auy lwild be made, then in LBis, making estimates. NBu engineers and iond lijBA know, iippro.vlmatc-Wjgotkslrnblc iippro.vlmatc-Wjgotkslrnblc grades of rrwk could be found. It. seems absurd to make an estimate of tho ,cost of a road, vol" the money to build it. draw up specifications, speci-fications, and then go out and bunt for a rock that will fulfill the conditions. In the delivery of steel, or brick, or any manufactured product, that might be done; the. tests might be made after nil Is manufactured and acceptance or rejection re-jection might, be had as a result of the tests. "With stone, however, we. would not go out Into the open mnrket and purchase a stone of a speritled coefficient coeffi-cient of wear, hardness, toughness, etc. The engineer Is npt to select the kind of i stone and nuarry and ask the contractor to bid on the delivery of that particular rock. - Testing Utah Bock. Having In mind the usefulness of ad-vancestudy ad-vancestudy of the. properties contained by different rock for roHdbuildlng. the ("niverslty of Utah, and In particular the testing department of the State School o( Mines, an institution of the stale, began the Installation of a road-testing laboratory. labora-tory. During the. past two yearn thorn have been Installed standard abrasion cylinders for testing paving brick and macadam rock, standard testing machine?, ma-chine?, etc. A lather preliminary investigation in-vestigation of many of the rocks ln the valley was miido and a report of the same" was published by the State School of Klines in their bulletin No. 2 These tests show a wide variety of results. Of the limestones tested some are useless, while others could b easily accept ed. Them Is a great deal of difference in the wear of the same kind of stone coming com-ing from different quarries only rhort distances apart. The results convinced us ihat the wise plan would bo to spend a little effort now in studying what wc have In tho nature of valuable road materials ln the different parts of the state, so that when we. begin to build long roads into tho country districts we will make no mistakes In the selection of our material. There are limestones, sandstones, sand-stones, granites, shales and Igneous rock In great abundance all over the state; wc can set to and use them when wc will. Nature has been liberal in her supply of rock. "Wc only must be careful In our selection. Good road materials will stimulate stim-ulate their use. whilo the discouragements discourage-ments which will follow the unwise use of poor materials, although good materials ma-terials may be at hand, will result in retarding re-tarding our progress. In conclusion. I want to say that the testing of stone for roads can be made a safeguard against the uso of poor material ma-terial just the same as the use of tho other engineering materials, and the engineer en-gineer who will accept nothing short of materials that will pass the prescribed tests will secure a quality of material that Is bound to be more durable and useful. No one wotdd think of accepting accept-ing largo consignments of steel rails for the railroad bed without knowing what its composition is and physical proper-lies. |