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<br />o <br />,- <br />~ <br />N <br /> <br />c <br /> <br />2 <br /> <br />MODEL TESTS OF BOULDER DAM <br /> <br />PRELIMINARY EXPERIMENTS <br />SECTION PAGE <br />17 Tar, pitch, and resin..m............-- ..........hu..._........m......___n...................mn... 34 <br />18 Sulphur and cel1te.........................n..... ............n.......... __n.....................__..._ 34 <br />19 Linseed oU mixtures.......... mum...m.. ..............____.. 85 <br />20 Undersanded concrete ..............nnm.n... ...n....___h.. .....hm___n.......___..._ n.m._m_._.__.. 35 <br />21 Cement-asbestos sheets ._..........__..........................__... ...m....un....___..__...........____.... 35 <br />22 Rubber-aggregate concrete nu ............................ ......................___.. 35 <br />23 Hard rubber _...........__....._...._...........hnu........................._...... .m._._...........___...........___. 35 <br />24 Cement and plaster of Paris....___._......___...........__. .....__........__....__...__..................... 36 <br />25 Cem-ent or mortar and asbestos ........h..........__.....h.....h....................................... 36 <br />26 Cement and celite.................................................................... ................................... 36 <br />27 Cement, asbestos, and celite...h...........h. ........__n..h..____........................................ 37 <br />28 Plaster of Parts and asbestos. ................... ....mh...................m............ 37 <br />2-9 Plaster of Pa.ris and celite...................__...........__............__.......__... ...................-....... 38 <br /> <br />COMMBJRCIAL BUILDING PLASTERS <br /> <br />30 Characteristics .......0................__ ....................0... ..........0..__.0...... ................... 40 <br />31 Certainteed plaster of Parts......__ m................... ...............................0.......... 41 <br />32' Red Top quick-set plaster.__............ .......h..............h.................__....__............... 41 <br />33 Red Top slow-set plaster....h.......m.................... ..............__.h.................... 41 <br />34 Retarders h.................._........__.....__...h............. .....,.____.................0......__...........__........... 44 <br />35 Sunllower molding plaster................. ...........__......0..................... 44 <br />36 Ideal finishing plaster.............__.................h ...........0.................0.____....................__.... 46 <br />37 Acme finishing plaster................__......................... ...00... _..............................__........ 50 <br />38 Acme plaster, celite, and lead...................h..__... ._m........h______.. ...__..0<_____............. 51 <br /> <br />TESTS OF RECOMMENDED MIX <br /> <br />39 Recommended mix __....hhm............. .........................m... 53 <br />40 Shrinkage of recommended mix........ ................__ ...".h.u.................__.__._......h. 56 <br />41 Workab1l1ty of recommended mix __....'''''m...''''__ .......0.....................__.__............. 56 <br />42 Bond at metal inserts............____.............................__. ___.....h....__.................__....h...... 62 <br />43 Evaporation rates ..__.... ............0... ......._...__...._.... __...__.........h...m.............h.............. 64 <br />44 Plotting test data......_.................... ...........,.......... ..n.............................................. 67 <br /> <br />CHAPTER III-PLASTER-CELITE MODEL AND <br />MA TERIALS TESTS <br /> <br />45 Design of modeL.hm............ <br /> <br />....................... 71 <br /> <br />CONS1'RUCTION OF SUPPLEMENTAL BASE <br /> <br />46 Method of construction.....__.__................_. ..m...h.....__. <br />47 Form for casting ca~yon walls....h..__..... . <br /> <br />............................................ 74 <br />74 <br />