Патент USA US2409095код для вставки
IVUI Lxamme comma 0R PLAsnc .315’ c7 Patented Oct. 8, 1946 2,409,094 UNITED STATES PATENT OFFICE 2,409,094 BALLAST BLOCK Carl C. Ahles, Albany, N. Y. No Drawing. Application May 29, 1943, Serial No. 489,257 4 Claims. (Cl. 106-97) 1 2 My invention relates to ballast blocks, counter weights and the like, and particularly to articles of this type which are magnetic to facilitate the handling thereof by electromwa'lg'r'iets, and which duces a considerable quantity of ?nes which may are cold molded or cast, like concrete stron dense mass of excep o 0 form a s 1 rav y. * be readily separated from the lighter materials by magnetic separators. Such ?nes are preferably used alone with the hydraulic cement to form 5 concrete consisting en'tifélybf fine‘ aggregate and a binder, or, as a ?ne aggregate mixed with a coarse aggregate of magnetite. However, a satis At the present time due to the great demand for factory, heavy, magnetic concrete may beformed iron and steel and other heavy metals in the pro by combining a coarse, or a partly coarse and duction of war materials, substitutes for iron pigs 10 partly ?neLheavy’aggreg‘ate suchjfor example as and the like which have been heretofore used or ore, which ma or may not be magg for ship ballast, counterweights, etc., have been ne 10 W1 a. comparatively smmm sought. What is needed is a material of high Hr'ie my?etite. Of course the magnetic proper speci?c gravity which can be ‘utilized en masse, 'ties‘o concrete will vary with the proportion or in the form of blocks which can be conveniently 15 of magnetic material therein but concrete in handled and closely packed and which are formed which mjgnetite constitutes 10% or more, by weight. of the total aggregate can be handled of materials not so essential in the war effort as the various heavy metals. Ordinary concrete with the present types of magnetic equipment. Because most of the lighter materials can be of blocks and for these reasons would be an ideal 20 eliminated from the ?nely crushed ore and the resulting concrete is therefore of higher speci?c material were it not for its comparatively low can of course be cast en masse or in the form speci?c gravity and the di?iculty of handling and placing preformed blocks made therefrom. Cop per, lead, or other heavy slags might be used in gravity, I prefer to use, as an aggregateLmagne of special ?ne crushing must be undertaken to produce a desirably dense concrete. Further portion of voids. Only su?icient water to form tite. 6W‘?! mil-mesa. lioJlL'Biév'éI "The Bro=portion of dry voids in such a mass is com the concrete as an aggregate instead of stone, but 25 paratively small, usually from 30 to 40%, and the in crushing the same, insu?icient ?nes are pro cement which is required to ?ll these voids, and Vv‘liicli‘is of course much lighter than the mag duced to use with the larger particles in order to make a dense concrete and hence, either a netite, does not reduce the speci?c gravity of the fine aggregate of substantially lower speci?c ?nished concrete to the same degree as would be gravity, such as sand, must be used, or the expense 30 the case with an aggregate having a greater pro a workable mix should be used. more concrete blocks of such aggregate cannot Where the material is cast in the form of blocks be conveniently handled and are a poor substi which must be handled or shipped, as distin tute for iron pigs. 35 guished from casting en masse, I prefer to use The principal objects of my invention are to from four to six parts by weight of magnetite to ' - . '= oncrete structure having a very . a vi - “1;, e inmany localities an w c mre - yer, one part by weight of hydraulicwcem‘e?t'bécause, when the magnetite ratio is appreciably increased the blocks are not so strong. If the blocks are will impa? niag‘?i‘tic “- t e blocks 40 subjected to Mg treatment they will, maHe'Thereirom which will facilitate W intwenty-four ours, op a crushing strength nan-w With these objects in view I have formed highly satisfactory ballast blocks from a concrete com prising, by weight, one part of h draulic cemen and from four to eight parts of netite. 'Euc? blocks are highly magnetic and t?us may 5e easily handled by electromagnets. Magnetite is the of around three thousand pounds per square inch. Thus the blocks may be made one day and shipped the next. In twenty-eight days they will acquire 45 a crushing strength of about four thousand pounds per square inch. In casting, the use of vibrating molds or other means for producing a dense structure are preferably employed. magnetic oxide of iron (Fe-404) and, when pure, While, as pointed out above, I prefer .to form contains more than 72% of metal. The speci?c 50 the blocks entirely of ?ne aggregate anwg gravity is about 5.1. As found in nature, the mag-F, cementI because by ely crus g the ore a purer netite may be combined with lighter, non-mag?‘ and heavier concentrate is obtained, it is to be netic materials and the speci?c gravity may vary understood that both the ?ne aggregate and the from about 4.2 to 5.1. However, as distinguished ea ate may be magneti On the other from slags, the magnetite, when crushed, pro 55 $5, as pointed out a?a?lg‘gates of other 2,409,094 3 heavy materials such, for example, as co 4 r or By the term, f‘ballast blcclr," as used in the lead sla s may be used with a ?ne aggrega e con claims, I mean to include both precast blocks of regular shape and concrete cast en masse. What I claim is: 1. A magnetic ballast block having a specific gravity of the order/993 and up and formed of s'?'t'ing' % whole or in part'of magnetite, and blocks made therefrom will be sufficiently mag netic to permit oi’ their being handled by elec tromagnets. In any case however it should be borne in mind that a dense concrete of the heaviest materials is desired and the coarse and concrete comprising, by weight, about one part of hydraulic cement and from about four to about ?ne aggregate should be proportioned with this end in view so that the voids, which are neces eight parts of magnetite. 10 sarily ?lled with thecement which is very much lighter, are reduced .to a minimum. Ballast blocks made of ?nely crushedhmagnetite and Portland cement should weigh in excess'df one un re e y pounds per cubic foot or, in 15 2. A magnetic ballast block having a speci?c gravity of the order of 3 and up and formed of concrete comprising, by weight, about one part of hydraulic cement and from about six to about eight parts of magnetite. 3. The structure set forth in claim 1 in which other words, have a speci?c gravity of the order the cement is Portland cement. of about 3 or more; and, due to their regular size, 4. The structure set forth in claim 2 in which they may be piled or packed very closely so that, the cement is Portland cement. when any given space is ?lled thereby, the ag gregate weight is almost equal to that of the iron 20 CARL C. AHLES. pigs which can be placed in said space.