Document Va7mz8vdMX8kpwe98O3m57Go

FILE NAME: Concrete (CONC) DATE: 1940 May DOC#: CONCOIO DOCUMENT DESCRIPTION: Journal Article - Dr. Brown Lectures Harmful Dusts n 3u Im m n Charter Member CEMENT MILL SECTION of Associated Business Papers Concrete, w ith which h as been com bined Cem ent Age, N ew Y ork, and C oncrete E ngineering, C lev elan d , is devoted to the P ro per U se o f C oncrete and the M anufacture of C em ent. Volume 48 Established 1904 M ay, 1940 Number 5 Published. Monthly by Concrete Publishing Corporation 400 W est M adison Street Chicago, Illinois Telephone CENtral 8822 LL. oMuioselBlerro,okCmiracnu,laJtri.o,nPMubalnisahgeerr Donald T. Papineau, Promotion Manager Representatives E. NMeawcdYonoarkldCBitaycon 17 WLeostng4a5ctrhe--3R-5o2o6m0 909 ParkeDre&troTiat rbell 419 Curtis BiMda..di2s8o4n2 1W54.0Crand Bivd. RoSoamn F10r0a9n,ci1s5c5o:MDoonntgHomarewryavSt. Exbrook 6029 Los A3n1g8elWese:stDNonintHharSwtraevet& Co Tucker 9706 T he C em ent M ill E dition o f C oncrete itcTluhsetvCeelymefonrt tMhoilsleEindtietiroensteodf Cinonthceremteaniusfaecdtiuterde of Iptsordpaangdesceamreendteavnodterdelatoteddipsrcoudsusicotns.s of plant dcieesnigcyn,, cmheamnaigcaelmreenste,arocpheraantidonc,onptrroold,uqctuiaornr,y eofpfi- eraTthioen,CpermogernetssMainlldEndeiwtisonofatlhsoe icnodnutastirnys. all the mEdaitteiroinal apnudblissohepdroivnidtehse nceowrrsesopfontdhiengusReesgualnadr misedricshcaunssdeidsiningtohfethMeilml Eatdeirtiiaolns. whose manufacture offTichiaelsRanegdumlairll Sexecetciuotnivefsurvnailsuhaebslempiollinotspeorfactionng tacTthweitshubthsceriupsteiorsn opfrtihcee misat$e3r.i0a0ls atheyyeapr roindutchee. OUnneitedDoSlltaartesadadnitdioniatsl pfoorssepsossiotangse, ainnd alMl eoxtihceor. countries. Current copies, 40 cents each. Norman M. Stineman, Editor J. C, W itt, Consulting Editor CONTENTS Crushing Operations Get Much Attention in Cement Manufac ture ................................................................................................. 166 Dr. Brown Lectures on Harmful Dusts .................. ... ... 167 Estimating The Amount of Fly-Ash Emission . ........................168 New York Holds Big Safety Convention ............... .... 168 Small Pioneer Cement Plant Made History in Ohio ..... 170 Sulfate-Resistance of Commercial Cements -- By Philip W. Manson...................................................... ................................... 171 Lincoln Arc Welding Foundation Awards to Aggregate S2QQ.Q00 173 There Is No Mystery About Arc Welding--By J. F. Lincoln . . 174 Editorial Discussion ........................ ............................................. 175 Cement from the Home State The Debit Side of Reduced Labor Where Potential Demand Is Big Prefers Sedimentation Tube for Measuring Particle-Sixes............ 177 Performance of Portland-Pozzolan Cements in Concrete Work .... 178 MiU Equipment ............................................................................. 179 Advertisers Index. Page 48 Charter Member CONCRETE is indexed in INDUSTRIAL ARTS INDEX, which may be consulted in any Technical or Public Library. # Audit Bureau of Circulations _____ C O N C R E T E -- Cement Mill Section -- May. 1940 Copyright, 1940, by Concreta Publishing Corp, Page 165 All-Steel Crusher Unit A new type of all-steel reduction ccrounsshiner ehqausipbmeeenntanmnaonuunfcaecdtubreyr.a TWhiiss buuntitthoepiemrapterosvoenmethnet ngoywraitnotrryodpurciendcipprleo, vhiadsesbeaenhidgehseirgnsepdeetdo thhaanndlfeorlmaregrely.tonIt nages and large sizes of stone. Even though the new unit is of all-steel con struction, it is said to be of simplified design. Among other features the spider and top shell are cast in one piece, which is readily removable for the replacing of its manganese steel concave ring. Ad justments can be made for taking up the wsteeealr monantthlee.liner and on the manganese plaDnetssihgnaveres reocfogcneizmeedntthemianncurefaascetudriinmg portance of crushing operations--a point that may be verified when one considers some of the recently constructed or re constructed plants. South America and Texas For illustration, in a large plant re cently completed in Argentina, the nat ural deposit of limestone in the quarrv is drilled with pneumatic jack-hammers and is blasted down and further broken up, if necessary, by means of auxiliary blasting or even with sledge hammers. It niseatrranthsepoqrtueadrryto aandcafbrloemwaythetreermiitnaisl ttaranncsepoofrtefidveinmcialbesle,wtoaythbeucckruetsshfeorraat dthise plant. At the crushing plant the stone is d1u6-minp.egdyrfarotomrythcerucsahbelrewwahyichbudciskcehtsartgoeas into the raw storage space. A clam-shell with a capacity of 2 cu. yd., operated by a travelling crane, carries the crushed material to the grinding mill bins, from awshererequitireisd.fed to the raw-grinding mills [n a new cement plant recently built sinheTlleaxnads cthlaey,rawwhicmhaitserdiaellivceornesdisttos aonf taudrjeoinoifngthdeocskheblyl bvairrgtuea.llyHeerelimthienanteas papripmroaxryimcartuesshitnhga,t ionafsmthuechouatsputht eosfizea primary crusher. The shell, when un loaded, is carried by means of a belt coovnevreayobralalnmd ielll.evTathoersshtoelal ibsinfeddirtoectthlye ball mill with a vibrating feeder, and the mill operates in closed circuit with a vibrating screen. The tailings are re turned to the feed end of the ball mill, and the fine, semi-finished product flows by gravity to a large storage tank from which the feed for the tube mill is taken. A Huge Crusher Unit CeRmeecnotnsCtorumcptiaonnyofpltahnet-Uant ivLeeresdasl, AAtllaas bama (See Co n crete, March, 1938, p. s1y3s4te)m, inwvohlivcehd uthtielizdeessigtnheof maocsrtusmhiondg ern equipment available. The primary crusher is a huge unit described as a 42-in. gyratory crusher which has a rated capacity of about 500 tons an hour. From the primary crusher the rock is dis cchararrigeesdtheonrawto maateprainal ctoonav4ey2obry w66h-iicnh. chraumshmeedr smtoinlle. iFsrcoamrritehde htoamthme eorpmenillsttohre aTghee srpaawcembaytermiaelanstsoroafgea sbpealctecopnrovveiydoers. rfooormc,lanyo,tsoannldystfoonrethaencdrusshhaeled. roTchke, beunt tire space is served by an electricallyoperated travelling crane having a span of 100 ft. and a lifting capacity of 10 tons, and equipped with a bucket of 3 cu. yd. capacity. This electrically-oper ated crane delivers any of the raw ma terials to their respective storage bins, and proportioning feeders installed be neath the bins carefully control the pro portions of the raw materials by means of a belt conveyor to the rock grinding mill. Dr. Brown Lectures on Harmful Dusts HARMFUL dusts constituted the sub by well-established analytical proced Ajpecritl-m2a3ttbeyr Dofr. aCalrelctotunreE.gBivreonwnonat thsuetraensc.esTahse frceoencsielnictraatainodn aosfbesstuocshissudbe University of Maryland. termined usually by the use of exceed Dr. Brown, who is connected with the U. S. Bureau of Mines, presented his oincgclaysiionngaelnlyioubsycgoruanvtiimngetprricocpedroucreeds,uarensd. lectures under the auspices of the Uni The application of petrographic, spec- versity, at the College of Engineering trographic, and X-ray procedures to the Auditorium at College Park, Maryland. determination of the composition of these He discussed the occurrence of the num substances, difficult to determine by chem erous kinds of dusts, their effects on hu ical procedures, is increasing. Micro man beings, the scientific methods used scopic measurement, air and liquid lu in counting them, and measures recom triation. and various indirect optical and mended for their control. other methods are used to obtain infor Dusts are formed by the disintegra tion of solid matter by such processes as mation on the size-properties of dust. The harmfulness of dusts may be abrading, crushing and grinding, Dr. Brown explained. The presence of dust controlled by such measures as substi tution of a non-injurious dust-forming tonf tihtse baeirinmg ahyarbmefoubl jetoctiborneaatbhlee, boercaiurrsie material for the harmful or objection able material; prevention of formation tating to the skin; it may render the air explosive; may increase operating and of dust; prevention of dissemination of dust into the air by the use of wa cplheearniicnvgisciboisltisty; .and may reduce atmos tgeoro, dwheotutisnegkeeapgienngts;,veenxthialautsitonh;oroedms,ovoarl sucThhedcuostmspaossitlieoand,ariadrsceonnicc,enatnratitmioonnoyf, otrficdaul spt refrcoipmitatthieonaiorrboythfeirltrmateioanns,;ealencd cadmium, and manganese are determined hv the use ot respirators. C O N C R E T E -- Cement Mill Section -- May, 1940 CAmeSrcihcaednuClehdemfoicraCl Ehixcpaogsoition HtEryMwISilTl RfeYatuarnedththeeAcmheemriiccaanl Cinhdeums ical Exposition by the Chicago Section onfoutnhceedAbmyerRic.aCn. CNheewmtoicna,lofSoScwieitfyt aannd cChoamrgpea,nya,t cthhaeirmmaenetionfgthoef ctohme mCihttieceagion Section held at Chicago on March 29. Plans for the first Exposition, to be held December 11 to 15, 1940. at the Stevens Hotel, have been perfected by a committee of ten and approved by the Board of the Chicago Section. Emphasis will be placed on chemical products and scientific exhibits will be ifnircsltuodfeda. seTrihees polfaenxpisostiotiomnaskteo tbheishethlde itnheevEexnp-onsuimtiobneroedf CyehaermsitcoalalItnedrnuasttreiewsitihn New York. Approximately 32.000 sq. ft. will be ahvibaiitloarbslearfeorexepxehcitbeidts. aOnfdficseosmoef 3th0e0 Eexx pmoisttietieonathav1e10beNenorothpenFerdanbkylintheStcroemet, cChhaircgaegoa,sIlmliannoaisg,erwoitfh thMe. WEx.pHosiintsioonn. in Page 167 C U Mt E 1 L For Better Concrete Pipe-- Use WELDED I Advertisers' Index ^iiiuiiiuiimKiimmtuKumiiiiiiiiumiiimiiumtmmimmmmmtmmmmmmtmuHtuuimmmmummumimmmim^ Reinforcing Mesh-- The A llan Portable Sp ot W eld in g O utfit can b e used riq h t on th e Job sp eedily, efficiently, d epend ably-- on all sizes of w ire. This electric w eld ing m achine elim inates old-fashioned tyin g m ethods, prevents cracking, and in creases pipe strength. Ca'.es beinWg weledlidnegd MbyacAhlilnaen Portable AU Machines Now WATER COOLED IFVtte fo r detail A LIA N MANUFACTURING AND WELDING CO. 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