Document YD2904Zp6n6n63nvRn2NRDEwN

ted SepL 3, IZSEttiL united: nvention relates sc 1 particularly to a c_ ete, or cement arxc-- /hen the wall memc . It is exposed to a m nges, and lfs interim s oi the ensilage-- that where the r.-.c U member is macci ition sets In due to -- : member causing .-- to be etched away, le purpose of st.t: , the concrete imr__ : is a binder and arid -- rock or the like, a __ ularly noted fore in order to ovr ace portions of t.tsd with some son resistant material, -m m contact with tier treatment works rm as the material ticuiariy in coldj rafWII "contract rc^romlcal ana: le wall member alone without am: a and such a wall .nr: to the action one ilie acids would : the wall member r or face surface come negligible inr cc that, what TM ames stopped on ace produced win cirar- cent and in themses ice in this case cm .here would be i i cement bond ai Ipptng or etching arm y spalling of the bove Indicated, it ts-= al to make the ws= nd. therefore, the c=c must be protecicgnir primary object or rm otectlve zone ai ber which Is nor ige. and to create, 'ermanent in natur im as well as a me le degree of acid m rimary object or -- i structural port c. c ian as an after r cc ,2 213,687 PATENT OFFICE MEMBER lioomficld, Ind. It. Serial No. 193.C68 rT-72--6) -resistant film to be incorporated directly within an concrete and to be so sealed therewithal as ic prevent loss of that material due to weather conditions or temperature changes. These and many other objects and advantages e: the invention will become apparent to those -versed In the art In the following description of ms particular form of the invention as Is lllus- crcted more or less diagrammatically in the ac companying drawing, in which 10 Tig. 1 is a vertical section through a wall mem ber within a mold; Tig. 2, a detail on a greatly enlarged scale of a section through the Inner face portion of the wall mnember on the line 2--2 in Fig. 1; and 15 Tig. 3. a view in top perspective of a finished -gal) member. Tike characters of reference indicate like parts mrrroughout the several views In the drawing. The invention is most easily carried out by wet 20 casting of concrete in horizontally disposed forms i- molds. The usual concrete consisting of ce- msent, aggregate, and water is prepared In the de- mred proportions and placed In a flat mold 10 in sufficient quantity as to bring the level of the con crete up to within a slight distance below the top cage of the walls of the forms, such as from one- emmer to one-half inch therebelow. The mold is -crrouglily vibrated in order to settle the con crete therein so as to bring the upper face of the 30 concrete then in the mold into a flat surface on c .Horizontal plane. It Is to be noted that the concrete is sufficiently wet so as to permit it to be -unrated to this level condition as opposed to the c-ter concrete mixture employed in power tamp- 35 ~ machines. in the present instance, fhe wall member 11 -smug described is that as employed in a silo g-xterein the thickness would be about two and mm-half inches and the width about twelve and 40 cnc-half inches with any desired length such as c=c and one-half feet. Preferably the member cm this application would be-provided with a remove on one side and a tongue on the other for -matching when the members are placed one 45 cjramst the other, edge to edge to form the silo. in a suitable mixing mill, sand is heated to a temperature well above (he melting point of the material to be employed as the acid resisting c hum. While it is pos.-ihle to use n number 0f 50 ccaierials for tins pill IB.le. suclt ns asphalt, tars. r yiv tha Wax is easily handled, is Iiclently low in price to permit its economical and lias certain additional qualities as will rsmafter become apparent. For the present 65 aple, the acid resisting medium will be re ferred to as wax. To the heated sand is added cm melted wax in the desired proportions.. This g-il. depend somewhat upon the size of the indl- -vcanal grains of sand, but in practice one par- 00 DSW 379500 STLCOPCB4100272 2 ticular twelve jjB=rz a through ~tx ar^f self thrmig--.tfau S uniformly- --~rr proximoti the wax The rr is then cr 10 mixer w.-aarr -mhented w:i. : -- of sand. ~c:--: t mixed foruniform ~ 15 The re*wm~.---- mold <0 its top the initial--- a::__-- moist str 20 the sand-arm:-- to a smo this top Givitr as to form 2: of cleavage: a^rr 23 concrete "ter j\s illu: in Fig. 2. side of the: tt-e also the 30 positioner. ~ major pert; n: represented x tides of and bontirre xr 35 facing zoitEe xi of sand lt around wtirr down ir concrete in 40 of the pan contacted but each ---- - wax 15. Trr 45 sand pars, of the invert! Since the cement: -- coming into; asm 60 action da particles, the cement: r sand parnrrs". in film about any invwrt s! tlculariy afterr to the weatts*=r CO : becoming spread th; the sand air of wax tli time the 5i~ c uted even mm: tween ti.e weather be a greater rr tm the wax err 70 faclr.q zentlike spaces .nm sand. Theme-Una. .zjji3,ea7 again, or when the wall members become warmed - by the heat transmitted from the fermenting en silage, the wax la still there and upon expansion will refill that spacing. - In other words, by reason of the unique man* 8 ner of Introducing the wax into the facing zone of the wall member, the wax Is not only placed more deeply Into the zone than It would be If It were merely painted or spread on the surface, but the wax is placed there in a permanent fash- 10 ion without danger of being scraped off, cracked off. or otherwise lost. Referring again to the method forming the in dividual member, the cast member Is left in the mold until it is hardened sufficiently that it may if be removed without damage. The removed mem ber is then cured in the usual manner. Inciden tally by reason of the presence of the facing sur face zone, the Water does not evaporate from the member as quickly as it would otherwise and, 2 therefore, good curing conditions are extended in a very beneficial manner. .. When it is desirable to employ less water than required in the above' indicated procedure, the facing mixture of sand-wax-cement may be "dry- 22 mixed." that is, mixed with a minimum amount of water, and then this "dry-mix" may be placed first in the mold on its pallet or floor and then vibrated at a sufficiently high frequency to level It. Thereafter, the main body of concrete of the 20 usual "wet-mix" may be added to fill the mold, the mold vibrated.for a brief period, and then the- surface of the concrete smoothed off to com plete the casting. This procedure forms the face side down instead of on top as in the procedure first explained. .. Also it is to be noted that there is an actual saving of labor in preparing the wall member in the manner stated in that the wax may be intro duced Into the wall member as described with 40 less labor than it could be by first putting the member through a heating operation and then Immersing it in molten wax so that the wax may penetrate the pores or capillaries of the mem ber. as has been done heretofore. While the 45 process has been described in reference to a silo wall member, it Is, of course, well adapted to other concrete members such as building blocks and the like where a water resistant surface zone is desirable as well as an acid resisting zone. 63 While I have herein shown and described my invention in the one particular form, it is en tirely obvious that structural changes and method changes may be employed without departing from the spirit of the invention and I, therefore, do 53 not desire to be limited to that precise form be yond the limitations as may be imposed by the following claim. . . . . I claim: ' A structural concrete member having a body 63 of cement bonded aggregate normally susceptible to acid and water penetration, and a cement bonded facing zone integrally a part of the mem ber having finely divided aggregate particles each separately embedded in a paraffin wax film, said 65 particles being closely spaced to have a thin en velop of bonding cement therebetween outside of said films, the capillaries of said bonding cement causing spreading of said films under favorable temperature conditions therethrough from one 70 particle to another. . WALTER O. BRASSERT. DSW 379501 Sept. 3, 1940. w. o brassert CONCRETE WALL MEN9ER Tiled March 3. 1933 2,213,687 z~r Tntsertior' 0. JjllGTneys. DSW 379502 STLCOPCB4100274