US2264223A - Analyzing device - Google Patents

Description

NOV- 25, 1941- c. w; srANcLlFl-E I 2,264,223

ANALYZING DEVICE Filed` June 13, 1938 A 'lill/A Patented Nov. 25, 1941 ANALYziNG nEvioE,

Cecil Wheatley Stanclie, Rochester, England,

assigner of one-half to WingetLimited, Rochester, England Application June 13, 193s, serial No. 213,549 In Great Britain June 21, 1937 3 Claims.

wet and in accordance with this invention We take a sample of this Wet mixture and subject it to a sieve analysis.

The usual concrete is gauged with a specified amount by weight or volume of cement, a specied amount by weight'or volume of sand or ne aggregate and a speced amount by weight or volume of gravel or coarse aggregate. Occasionally the coarse aggregate is further subdivided according to sizes.

An object of the present invention is to provide a method of, and means for, analyzing a Sample of concrete to ascertain th'e relative proportion in that sample of cement, ne aggregate and coarse aggregate or aggregates.

By taking different samples of the wet mix from a batch, for example from the beginning and the end of the batch, or from different points just after placing, the degree of uniformity of the mix may be ascertained, thus serving as a test of the eiciency of the mixer.

Another object of the invention is to provide apparatus in which the cement or other binding material is washed from the aggregates which are themselves separated by sieving into two or more grades so that the proportions by weight or volume of the different grades of aggregate and of the cement if required can be determined approximately.

The separation is conveniently effected by placing the sample in the uppermost of two or more superposed graded sieves which are fully immersed in water and agitating the sieves till the cement is washed from the aggregate and the latter is separated on the various sieves.

With th'e above and other objects in View, the invention consists in the improved combinations and arrangements contained in the embodiments now to be described in detail and features of which are set out in the claims which follow.

In the drawing:

Fig. 1 represents a cross-section of one form of apparatus and,

Fig. 2 represents a cross-section of another form.

Referring to Fig. 1, a number of graded sieves I, 2, 3 are supported one above the other ina cradle 4 which is removably suspended from a spring balance 5.

The cradle 4 is positioned within a container 5 which is preferably of glass, but may be of any other suitable material, and which is also removably suspended from the spring balance 5. The container 6, if not made wholly of glass may have a glass window in one side.

The container 6 is arranged to be filled with water and its base is provided with a drain cock l which as shown forms the entire base of the container. i

In order that the approximate cement ratio may be determined the base of the container is conveniently reduced in section as at 8 and is graduated at 9 to give quantities of cement by weight or by volume.

The spring balance 5 from which the cradle 4 and container 6 are suspended is carried by a tripod or other frame and at a suitable point in the suspension of the cradle 4 below the spring balance 5 and a spring 8 is provided by which the cradle 4 may be agitated in order to separate the constituents of the mix placed therein.

The sieves l to 3 are arranged to t one on the other and when three are used they may for example be of the order of SA, 1% and '76 X 'i6 mesh.

In use of the apparatus a known quantity of concrete forming the sample is placed in the top sieve (which is the coarsest) and the container 6 is lled with a known weight of water. The cradle 4 is then agitated up and down in the water .until the aggregates have been shaken down to the appropriate sieves and the cement has been washed off as far as practicable into the water in the container.

When the agitation is stopped the cement settles intothe graduated portion 8 at the base of the container and its volume in a saturated state can be read. The calibration may be made so as to give directly the equivalent dry weight of cement.

By weighing the cradle with the sieves empty and with one, two or three sieves respectively containing wet sieved aggregate, the weight of aggregate of each grade may be calculated.

By placing a known weight of water in the container and then weighing the latter containing the cement and water from the mixed sample, the amount of cement and water of the sample may be calculated.

From a visualjinspection of the graded vtiaslned-vv aggregates in the sieves a rough indication of the proportions of the mix is given and the qualf, ity of the aggregates may also be seen.

Where it is found desirable means may ibepmvided for raising the cradle, above the Ilevel of the water in the container for .weighing purposes.,

By providing a series of testers which can" be operated at once several samples may be tested at the same time.

In another form of sampling apparatus which is shown in Fig. 2 four cylindrical sieves I I, I2 I3 and I4 of successively ner mesh are arrangedvcoaxially. Thesieves are Ixelat one yend to a plate I5 and are progressively longer so that each-.sieveglies enti-relywithin lthenegit largest sievegleavinga spacebetween them. Thebottom ends ofthe sievesi I I Vto, vI 4 areV closed-by plugs I5, I'I, I8 and I9 respectively. g

Aninlet chamber 22is provided. on the. plate ligand; communicateswith the interior. o f the coarsestf. sieve I I (that is the` innermost: one) by anaperturemin tnenlate.- The. chamber 206s closed by Aa detachable cover plate,.22.-

The sieve assembly isnrountedon a-,shaftf23- 25 which permits rotation of the shaft (fo reX-' ample by .the crank 2 6 .or by power drivenmeans) and also, permits mQVSmCnt of thersieve assembly as a Awhole ink substantially anypdirection.

Thecontamer Zillisrartally filled with Water.,- 40 to a depth sufcient to immerseva :substantial part.

ci, each sieve. A lrricvvn Weight ofthe concrete to,.,besamplecl,is, then dumped into the inlet chamber 29;-,and .so into the.,v coarsest sieve.,l I I and/the licllgkis replaced. k

Theisieves are thenrotatedby thezcranl and arealsomeved bodily in, the,-Waterbyosillatf ing the shaft 23,so that `the concrete is, sieved,`

through-the sieves, the, successivesieves, retaining Sussivelylner grades of the materals'aed the cement and fine sand beingvvvashed throughvinto s the container.

Theicontentspfthe successive sieves are remavd .Separately andmid. ,111. an-Oven and, then.;

thus .obtained.

The ne Sandvhih has DeSSQdzihS-leet Sieve.. isseparated from the cement by` furtherWashing.j

itswenn.,beiiiaaeddto. hatloffiae0-thet sand to give the total we i l1 t.\of ,a sand inthe.,

sample.Y

cement als@y driedanld weighed' The tqiallweieht; of the; draak-materialen@ .that be.

subtracted from the Weight of the4 sample to obtain the moisture content of the sample.

It will be clear that either form of the apparatus illustrated may be arranged as a battery containing a number of sampling units so that a plurality of samples may be treated simultaneously.Av When the form shownl in Fig. 2 is so arranged, it'is desirable to connect the shafts of each unit by means of a side bar so that the units all move similarly and to rotate the sieves by a common drive.

It is to be understood that the invention is not restricted to the details which have been described as they have been given by way of example only, butlthat it includes all such embodiments as come within the broad idea underlying it.

I claim:l

1. Apparatus for the analysis of concrete comprising areceptacle for water, a shaft protruding through the side of the receptacle, a rocking bearinabetweee tbashaf andtheside 0f ,the recepta egaahgpperrigidly ,connected to thev shaft Within the receptacle, a plurality of coaxial sieves Of/imSlT-S.deipgaffom the. inner t0 the outersievefmgnntedfcoaxially.of the shaft on the endg thegoiherisevee being Closed ai each end, and means for rotating-:the shaft about its axiefaaapseillatinstee Stettin arokieg bearingatusfortlieY analysis of concrete complielna- @.Ceptale few/@i811 ashaftproifudin g thruglnthe, side of; the container, a plate member rigid with theshaft andfhavinga central gcoaxlial Withtheshaft, aninlet chamber lbythetplate. and-Qin .communication with the..centraldopeningytherein, a plurality of sieves cfg,rriesl'tsize',decreasingV fromv the inner to the outer .sieve projecting from the plate member coagrially, ofluthe shaftv the` innermost sieve surroundingthe opening in the plate'and the remainingzslievesfbeing,closedby the plateagainst direct communicationkwith the inletchamber, all of the siev close'dat the end remote from the plateiniemb'er, and means for rotating the shaft.

3. Apparatus for the, analysis o concrete comprisingazireceptacleforwater, a vshaftprotruding thronffhthe'side ot ,the container, a plate. member rigid hvthgshat ,and having a central opening coax al Withlthehait, an inlet chamber carried bythe .plate andin ycommunifcation with the central opening therein, a pluralityof sieves of mesh sigedecreasing and lof length increasing from the innentot the puter.,sievaprojecting from` the vplate ber coaxiallylv of, the.` shaft,A the, innermost sieyesurroundingrthe, ,opening in the plate and they rem ning,sieves .beingA closed bythe plate N' A irect',vv communications with the inlet chamber, all ,of .thesieves being closed at the end remote from the plate member by removable plug membsrsland rasees forrpiaiine the Shaft QEQIL WHEATLEYSTANCLIFFE-

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