Document b53re4jZZNEarvMXzxBj6oLBy

FILE NAME: Trade Publications (TR) DATE: 1940 May DOC#: TR024 DOCUMENT DESCRIPTION: Trade Journal Article - Dr. Brown Lectures Harmful Dusts Charter Member LB * I 3 .1 , CEMENT MILL SECTION oi CoNC binea Conci devote and tt Published Monthly by Concrete Publishing Corporation 400 West Madison Street Chicago, Illinois Telephone CENtral 8822 # Louis Brookman, Jr., Publisher L. Moeller, Circulation Manager Donald T. Paptneau, Promotion Manager Representatives New York City E. Macdonald Bacon 17 West 45th--Room 909 Longacre 3-5260 Detroit Parker & Tarbell 419 Curtis Bldg., 2842 W. Crand Blvd. Madison 1540 San Francisco: Don Harway Room 1009, 155 Montgomery St. Exbrook 6029 Los Angeles: Don Harway & Co. 318 West Ninth Street Tucker 9706 The Cement Mill Edition o f Concrete The Cement Mill Edition of Concrete is edited exclusively for those interested in the manufacture of Portland cement and related products. Its pages are devoted to discussions of plant design, management, operation, production, effi ciency, chemical research and control, quarry op eration, progress and news of the industry. The Cement Mill Edition also contains all the material published in the corresponding Regular Edition and so provides news of the uses and merchandising of the materials whose manufacture is discussed in the Mill Edition. The Regular Section furnishes mill operating officials and mill executives valuable points of con tact with the users of the materials they produce. The subscription price is $3.00 a year in the United States and its possessions, and Mexico. One Dollar additional for postage in all other countries. Current copies, 40 cents each. Charter Member Volume 48 Established 1904 May, 1940 Number 5 Norman M. Stineman, Editor J. C. Witt, Consulting Editor CONTENTS Crushing Operations Get Much Attention in Cement Manufac ture .... 166 Dr. Brown Lectures on Harmful Dusts . . . ................... .. 157 Estimating The Amount oi Fly-Ash Emission . 168 New York Holds Big Safety Convention . . 169 Small Pioneer Cement Plant Made History in Ohio .170 Suliate.Resistance of Commercial Cements -- By Philip W. M anson.............................................................................. 171 Lincoln Arc Welding Foundation Awards to Aggregate S200.Q 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 Quicker Chemical Analysis of Portland Cements .................... 176 Prefers Sedimentation Tube for Measuring Particle-Sires............ 177 Performance of Portland-Pozzolan Cements in Concrete Work . 178 Mill Equipment ............................................... . ........ ............. . 179 Men and Mills .......................... ................ ...................................-- 180 *8? Advertisers' index. Page 48 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 Concrete Publishing Corp. Page 165 May 1940 rimary crush- i lllfc j MM I i All-Steel Crusher Unit A new type of all-steel reduction crusher has been announced by a Wis consin equipment manufacturer. This unit operates on the gyratory principle, but the improvement now introduced pro vides a higher speed than formerly. It has been designed to handle large ton 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 wear on the liner and on the manganese steel mantle. Designers of cement manufacturing plants have recognized the increased im 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 quarry 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 is transported to a cableway terminal near the quarry and from there it is transported in cableway buckets for a dis tance of five miles, to the crusher at the plant. At the crushing plant the stone is dumped from the cableway buckets to a 16-in. gyratory crusher which discharges 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 where it is fed to the raw-grinding mills as required. In a new cement plant recently built in Texas the raw material consists of shell and clay, which is delivered to an adjoining dock by barge. Here the na ture of the shell virtually eliminates primary crushing, inasmuch as the size approximates that of the output of a primary crusher. The shell, when un loaded, is carried by means of a belt conveyor and elevators to a bin directly over a ball mill. The shell is fed to the 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 Reconstruction of the Universal Atlas Cement Company plant- at Leeds, Ala bama (See Concrete, March, 1938, p. 134), involved the design of a crushing system which utilizes the most mod 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 charged on to a pan conveyor which carries the raw material to a 42 by 66-in. hammer mill. From the hammer mill the crushed stone is carried to the open stor age space by means of a belt conveyor. The raw material storage space provides room, not only for the crushed rock, but for clay, sandstone and shale. The en 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 convevor to the rock grinding mill. Dr. Brown Lectures on Harmful Dusts HARMFUL dusts constituted the sub ject-matter of a lecture given on April 23 by Dr. Carlton E. Brown at the University of Maryland. Dr. Brown, who is connected with the U. S. Bureau of Mines, presented his lectures under the auspices of the Uni versity, at the College of Engineering Auditorium at College Park, Maryland. He discussed the occurrence of the num erous kinds of dusts, their effects on hu man beings, the scientific methods used in counting them, and measures recom mended for their control. Dusts are formed by the disintegra tion of solid matter by such processes as abrading, crushing and grinding, Dr. Brown explained. The presence of dust in the air may be objectionable because of its being harmful to breathe, or irri tating to the skin; it may render the air explosive: may increase operating and cleaning costs; and may reduce atmos pheric visibility. The com position and concentration of such dusts as lead, arsenic, antim ony, cadmium, and m anganese are determined by well-established analytical proced ures. The concentration of such sub stances as free silica and asbestos is de termined usually by the use of exceed ingly ingenious counting procedures, and occasionally bv gravimetric procedures. The application of petrographic, spectrographic, and X-ray procedures to the determination of the composition of these substances, difficult to determine by chem ical procedures, is increasing. Micro scopic measurement, air and liquid lu triation, and various indirect optical and other methods are used to obtain infor mation on the size-properties of dust. The harmfulness of dusts may be controlled by such measures as substi tution of a non-injurious dust-forming material for the harmful or objection able material: prevention of formation of dust; prevention of dissemination of dust into the air by the use of wa ter, wetting agents, exhaust hoods, or good housekeeping: ventilation; removal of dust from the air by filtration, elec trical precipitation or other means; and hv the use of respirators. C O N C R E T E -- Cement Mill Seciion -- May. 1940 American Chemical Exposition Scheduled for Chicago CHEM1STR\ and the chemical indus try will feature the American Chem ical Exposition by the Chicago Section of the American Chemical Society an nounced by R. C. Newton, of Swift and Company, chairman of the committee in charge, at the meeting of the Chicago 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 bv the Board of the Chicago Section. Emphasis will be placed on chemical products and scientific exhibits will be included. The plan is to make this the first of a series of expositions to be held in even-numbered years to alternate with the Exposition of Chemical Industries in New \ ork. Approximately 32.000 sq. ft. will be available for exhibits and some 300 ex hibitors are expected. Offices of the Ex position have been opened by the com mittee at 110 North Franklin Street, Chicago, Illinois, with M. W. Hinson in charge as manager of the Exposition. Page 167 t U k L r, t I L For Better Concrete 1 Advertisers' Index I Pipe-- Use W ELDED Reinforcing Mesh-- T he A llan P o rta b le S p o t W e ld in g . A llan Mfg. & W elding Com pany................................... 48 O utfit c an b e u se d rig h t o n th e |o b speedily, efficiently, d ep en d ab ly -- A m erican Colloid Co...................................................................... 38 on all sizes of w ire. A nchor C oncrete Mchy. Co.......................................................... 2 This electric w eld in g m achine elim inates old-fashioned tying m ethods, A nchor Div of C onsolidated C oncrete Machinery Corp...... 40 A utom atic Spring Coiling Co...................................................... 37 prevents cracking, and increases pipe strength. Berg V ault Co................................................................................... 38 Cases being welded by Allan Portable Welding Machine All Machines Now WATER COOLED W rite fo r detailt Besser M anufacturing Co.............................................................. 40 Bism arck H otel ................................................................................ 48 Black & D ecker M fg. Co............................................................... 2 B utler Bin Co...................-.............................................................. 35 ALLAN MANUFACTURING AND W ELDING CO. Calcium Chloride A ssn.......................................................................... BUFFALO. NEW YORK Chain Belt C om panv...................................................................... 39 C. H & E Mfg. C o.......................................................................... 37 C lark T ru ctrac to r ....................................................................... 21 ,n ultra-modern hostelry in the Classified L iners ................................................................... 47-180 Coddington Mfg. C o . E D .................................... .........- ......... 37 Colorcrete Industries. Inc.............................................................. 31 Com m ercial Shearing & Stam ping Co................... ... 32 heart of Chicago C oncrete E quipm ent Co.................................................................. 33 Consolidated Concrete M achinery Corp............... 40 C onstruction M achinery Company .............................................. Conwell, E L.. Co ....................... . . -- .. . ............ . ... 38 D ouglas Fir Plyw ood A ssn.............. ..................................... F oote F oundry Co., J. B.................................................................... 36 B U m a v HOTEL Emil Eitel -- Karl Eitel ck Roy Steffen H ansen Co.. L .................................................................................. 47 H arshaw Chemical Co., T h e ........................................................... 38 Ideal Div. of Consolidated Concrete M achinery Corp......... 40 Iron & Steel Products, In c ............................................................ 180 Jaeger M achine Com pany, T h e .................. 27-37 K irk & Blum Mfg. Co.. T h e ......................................... 39 K oehring C o m p a n y .................... 32 Construction Contracts . . What should they cover? How can they be simplified? How can they effectively provide against hazards? How can administrative respon sibilities be made plain? L ehigh P ortland Cem ent Co..................................................... 25 L iving-Stone Co................................ . ............................. 47 L & M Mfg. C om pany................... .4 7 Lone S tar Cem ent C orp............................................ . . 11 Mall T ool Co . ...................... ................. ..... ...... . . 31 M arquette Cem ent Mfg. C o ................................ 16 M edusa P ortland Cement C o ......................................................... 19 M epham , Geo. S., & C o r p ............................................................. 39 Miles Mfg. Co................................................................ . . . 35 M ultiplex Concrete Mchy. Co................................................... 35 N ational Chemical & Mfg. Co.......................................................... 15 Here is a practical aid--a tool to save architects, engineers, and builders money New H olland M achine Co........................................ . . . . 36 Noble, T hos. W ............................................................ ..................... in the work of preparing contracts and in making them more logical and effective in the functions they must perform. O lsen, E ugene F ............................................................................ 23 Pennsylvania-D ixie C em ent C orp..................................................... -- Just Out -- P o rtlan d Cem ent A ssociation......................................................... 26 ! Professional Service ....................................................................... 38 Business Methods in the Building Field B y Schobinger and Lackey-- $3.50 j Reed Co., R. F ............................. 33 R icketson M ineral Color W o rk s................................................ 38 Ryerson, Jos. T .t & S on........................................................... 39 Sasgen D errick Co.......................................................................... 38 Skilsaw, In c ......................................................................................... ... A practical manual of business methods and documentary procedure ; SSpmeicthialCtioe.s, T......L....................................................................................................................................................................3..8-4371 in the development and execution of industrial, power and building , Stanley W orks, T h e ...........................................................................28 projects. The book covers the range of contract documents and pro Stearns Mfg. C o................................................................................... 23 vides useful checking lists, as well as specimen forms for a complete Stonex In d u s trie s .................................................. 16 building project. It also analyzes the relations of all parties to the Superock Co., T h e ...................................... . ..... .. . . . . . 29 work and is therefore useful to owner, architect engineer, builder and r subcontractor. T am m s Silica Co................................................................................. 38 U n i v e r s a l D iv . o f C o n s o l i d a t e d C o n c r e t e M c h y C o r p ............ 40 CONCRETE PUBLISHING COMPANY book d epa rtm en t 400 WEST MADISON STREET CHICAGO, ILLINOIS Wa>Ku- ( Ti e 29 W ay lite -S u p e ro c k .................... . ...................... . . . . . ... 29 W illiam s, C. K.. Co........................................................................... 39 You can buy with confidence horn C O N C R E T E advertisers OSTS JANUAR/, I960 For producers of concrete block, precast and prestressed concrete products and ready mixed concrete Published Monthly By Concrete Publishing Corp. * 4 0 0 W. Madison St., Chicago 6, 1(1. * Central 6-8822 MTROLS )onald T. Papineau Publisher 3 RAISE Jack Anderson Editor advertising iepresentatives Iidwest: Dwight Early OLD 8i Sons, 100 N. LaSalle St., Chicago 2, III. CEntral 6-2184. jiii" afety ontrol luded your 3stern: Porter Wylie & Co., 114 E. 13th St., New York 3, N.Y. GRamercy 5-3581. Western.Crawford L. Elder, 2500 El Venado Drive, La Puente, Calif. OXford 4-4116. ew England: Clarence L. Morton, 294 Washington St., Boston 8, Mass. Liberty 2-8538. your IY gan Circulation Audited and Verified by The Verified A udit Circulation Company. 1,40 Radistres-- New Prestress M e th o d ........................................................... Radial prestressing designed to make possible production of ex tra-large, thin, strong panels. Meeting R o u n d u p ............................................................................................................... A condensed report on meetings held recently by ESCS1, CMA, ASTM in Canada, California. Get Tax S a v i n g s ................................................................................................................... Using the speed up depreciation method can save you money when fax time rolls around. How To Get Safety Materials Nylon Replaces Mortar in Sweden I d e a ........................................... E d ito r ia l......................................................................................................................................... News .................................................................................................................................................. Materials and E q u ip m e n t...................................................................................... The Cover: Pictured is a view of part of NCMA's reception room in their new Washington, D. C , office. The office is highlighted by effective use of screen units, Shadowal, other industry products. 16 20 23 25 24 15 5 28 All correspondence and editorial material should be addressed to Concrete Publishing Corp,, 400 W . Madison St., Chicago 6, ill. All ad plates should be sent to Concrete in care of Wayside Press, Mendota, (It. Subscription Price: $.00 for one year, $11.00 for two years, postpaid. No subscriptions accepted for longer than two years. Single copies, 50 cents. Copyright 1960 by Con crete Publishing Corp. Accepted as controlled circulation publication at Mendota, 111. 3  A D VER TIS ER 'S u g lify 11 Autom atic Spring Coifing C o m p a n y .......................... 'B a n h U t^ C o tw e lowa-Des Moines National Bank's functional design enables bank cut temper and parking fees. 3 Th building materia/ that molds itself t and builders. 3 Penn-Dixie ceme J i B e sse r Com pany ............................................................... J3 B e sser Com pany .................................................... B ack Ce J4 C ard inal Scale M anufacturing C o m p a n y ................ ^ a / v d lb c U Suspension HOPPER SCALES Many leading concrete batching plants are now using Cardinal Dial and Beam Scales. Cardinal scales are extremely flexible and can easily be integrated into any special equipment. Manual, semi-automatic or fully automatic operation. Specify Cardinal. Capa cities from 500 lbs. to 100,000 lbs. For complete information write Dept. C JS Colum bia M achine, Inc...................................................... J6 Conw el! & Com pany, . t .............................................. J7 O avls Com pdny, Frank 0 ................................................... J8 D u r-O -W al Products Com pany .................................. W Econom y Forms Corporation .....................................J1 0 Edlck La b o ra to rie s, Inc.................................................... J11 Erickson Pow or Lift Trucks, Inc............... .. .................. J12 Fo rrer's Products for M a s o n r y .................................. .. J I 3 Frasor P a lle t C le a n in g .................................................... For Q U IC K RESULTS J I4 Gerson Company ............. .............................................. J15 Ja e g e r M achine C o m p a n y ............................................. put your problem in J16 K ent M achine C o m p an y............................................... CONCRETE'S J I 7 Lan d ers-Seg al C olor Com pany ............................... Classified Ad Section J18 Le n aw e e P e e rle ss, Inc................................................. .. TOPS FOR: J1 9 lo b sfe in P alle t C leaning ............................................. Buying and selling used equipment. Finding experienced help. Locating the job you want. The cost is low--$10.00 per column inch. All classified ads are sold in even inch multiples. Closing date for all classified ads is the 4th of preceding month. Box numbers available at no extra cost on request. SEND YOUR AD IN TODAY TO: CONCRETE PUBLISHING CORP. 400 W. Madison St. Chicago 6, III. J2 0 l & P Tool C o m p a n y ............. ......................................... J21 M aster B uilders Com pany, T h e ............. Inside Front C J2 2 M onarch Road M achinery Com pany .................. .. J23 Penn-Dixie Cement Corporation . . . . Inside Back J24 P ra sch ak M achine Company ........................................... J25 Quinn W ire & Iron Works J26 Southeastern Pallet Cleaning Service J27 Superior Contrete Machinery Company J28 Supreme Products Corporation J29 Zeidler Concrete Products jENN-OIXli^> PEN Penn-Di O FF IC E S New York Philadelphia Pittsburgh Boston Chicago Detroit Atlanta Des Moines Chattanooga Nazareth, P. O w ner. lowa-Dt Centr 40 For more information use p o stca rd fa cin g p a g e 4 0 . CONCI