DE1523005C - Device for the production of large fractions of fresh concrete for analysis purposes - Google Patents

Description

3 4

longer time and the beginning of the setting of the cement cup flowing out washout liquid a velvet in the water bath can the calculation results. Melkanal provided, which in a collecting vessel influence. opens, to which a pump is connected.

In a further known device for the The pump can also be connected directly to the collecting

Wet sieve analysis of fine-grained material will be connected to the 5th channel.

Passage through the finest-meshed sieve through a The drawing shows schematically, partly in

Filter separated from the washing liquid. With the vertical section, an embodiment of one

Filters can be the finest components, filters and devices according to the invention.

Cement can be excreted from the washing liquid fairly in its The device shown has a pass-through totality. Cumbersome centrifuge with a housing 1, in which, however, the collection of the finest return occurs. a motor 2 via any gear 3 a stand from the filter for drying and weighing in the housing built-in, suitable centrifuge spindle of the same. The filter must be driven carefully by all 4, 5. In the upper part 5 of the centrifugal fine particles are cleaned, which is a joint spindle with the interposition of cumbersome and tedious work, so 15 taker rings 7 a centrifuge cup 6 easily one that there is a risk that due to lack of detection stored and removable. The drive of all residues in the filter the result of the centrifuge spindle could also ^v in any analysis is inaccurate. other way, e.g. B. via a belt drive,

It is the object of the invention to provide a device to be made. The top of the centrifuge cup 6

The production of grain size fractions of fresh ^ao is surrounded by a collecting channel 8 from which

to create concrete, by means of which an outlet line 8 α, if possible, opens into a collecting vessel 9,

precise, simple and quick disassembly of a freshly on a support rod attached to the housing 1 10 ^

concrete can take place in its components and is a sieve box 12 by means of a swivel arm 11

by means of which the disadvantages of known devices are connected. This sieve box can, as shown,

be avoided. 25 in a position above an inlet funnel 13 of the

According to the invention, this task is brought about by centrifuge, or from this position

solved that the sieve set on one of the spindle in the position shown in phantom outside

centrifuge carried by a centrifugation device; 'are swiveled in order to

Fugierbecher arranged and transversely to its axis lift the collecting channel 8 ^: and a removal of the

is pivoted, and that a pump in front of 3 ° centrifuge bucket 6 to allow

is seen, which are from the centrifuge beaker in the sieve box 12 are four in the example shown

running washout liquid in the circuit in the sieves 14, IS, 16 and 17 of different mesh sizes

returns the top sieve of the sieve set. arranged one above the other. The lowest sieve 14 loads

This device enables a quick, complete sitting, for example, a mesh size of 0.075 mm and exact analysis of a fresh concrete ^{sample and 35 (64} ° 0 meshes per cm ² ) and that above it allows the totality of the sieve 15 contained in the sample to be 0.15 mm, while the two finest components can be determined quickly and easily. Upper sieves in staggered order have larger mesh sizes of the preferably metallic centrifuge. Depending on the needs, the separated fine materials can easily be used with more or fewer sieves. and can be removed without loss. The drying of this 4 ° Also on the rod 10 is a vibrator 18 fine components is preferably done in that the cup, which is firmly connected to the sieve box 12, is burned out together with its contents. A vibration of the sieve box is necessary, which is easily possible, since the washing takes place around a clogging of the lowest fine sieves with alcohol; the residues that remain in the beaker and that help prevent the aggregates from being washed out to alcohol need only be accelerated and intensified. In the further is to be ignited. After the cup has burned out, a holder is attached to the rod 10 for a collecting tray 22 which can be placed on the rod 10 for the complete removal of all residues and in which the smooth cup wall does not cause any difficulty. flowing liquid when changing cups

Because after the determination of the grain size frac- is caught. This is then again in the seventions by wet sieve analysis after drying the 5 ° rate poured.

Residues and the sieves still a dry sifting The collecting vessel 9 is to be carried out with a pump 20 all aggregates must be carried out in connection with any kind of construction in order to separate the washout still adhering to the aggregates liquid from the vessel 9 for reuse, upwards in to pump the sieve box 12,
the sieve set in an embodiment of the invention is around 55 Instead of using the collecting vessel 9, a support rod is pivotably arranged, which could carry the vibrator emerging from the centrifuge beaker 6 interacting with the sieve set, liquid also directly from the collecting channel 8 so that after wet sieving and Drying can be pumped up into the sieve box. Like the sieves and residues, the sieve set is shown from its, for example, dash-dotted lines, the collecting duct 8 can be swiveled out 60 above the centrifuge beaker via a pump 24 in order to carry out the dry sieving. Line 25 be connected, which the washout

When operating the centrifuge, it can happen that the liquid in a sieve box 12 on a

that the centrifuge beaker with residues over- extension of the support rod 10 carried vessel

is filled and the residues with the washing liquid 26 delivers. There is one at the outlet of the vessel overflow. To avoid a loss of residue 65 flexible conduit 27 connected, which allows

to avoid an incorrect result of the analysis "the contents of the vessel 26 in the uppermost sieve

lysis would result, the box is to be allowed to flow out in a further embodiment.

Invention for receiving from the centrifuge- In this embodiment it is necessary

5 6

at the collecting channel 8 an overflow line 28 to vibrator prevents clogging? the lower one, which in the event of a fault in the Abfühmaschigen 'sieves and accelerates ^! Aüswäsch-. ning; the. Directs liquid into a collecting vessel 29. process.

.: To the. Carrying out a fresh concrete analysis with the pivoting mounting of the sieve box 12

Using the 'device described can, for. B: 5 of the support rod 10 ^; allows easy replacement, proceed as follows: be the centrifuge beaker 6 \ because-the separating-

A sample is taken from the fresh concrete delivered in proportion to the 'quantities of finest constituents' supplied by a concrete preparation machine. can be big; it can happen ^ that one for the larger the maximum grain size of the ^; In concrete, an analysis is not carried out with an aggregate used: cup alone, the greater the should come. As soon as ⁵ a beaker 6 with centrifuge pressure sample, be. The weight of the sample is to be exactly overfilled, what can ^{be determined by a 1} turbidity: and is then: then mixed with a suitable amount of alcohol from the “flowing” alcohol-water mixture. The concrete sample becomes noticeable the washing-out process must be done - thoroughly stirred under the alcohol, which breaks it; The SiebkaSfeff 12 is 'then bound in water and a setting' of the concrete 15: the layer dotted in the drawing is prevented. The mixture of alcohol and water swirls; so; that the funnel 13 ^; and ^! the "Samirnel-- and: Concrete is then lifted off in the uppermost sieve 17 of the channel 8 of the centrifuge ¹ are able · ^ emptied sieve set 12 and removed by addition of weite- whereupon the centrifuge cup and 6 'a; rem alcohol washed!. The new cup is inserted in the liquid. The Aüswasehprözöß ¹ · suspended: finest constituents of the aggregates and ™ can then be continued ", of the cement, which with the liquid the 0.075 mm- After the washing out ^ det aggregates on

Mesh screen 14 'pass through the. Check all seven is terminated ;, which etwai ^l daüert h hour; -lauftrichterlS 'ih; den: centrifuge beakers6 where they will be; the contents of the sieves and; the residues separate as a result of centrifugal force: The 'in · the; Centrifuge cups' dried and then ¹ practically clear; Mixture of alcohol; and water - weighed exactly. Since the finest sieve irtP is shown - emerges at the upper edge of the beaker and arrives at the example; one; 0 ^ 75 mm mower sieve · is', received in; the ^ collecting channel 8 ^ from: where it is in the: vessel 9 through this Wiegüngenidas dry weight that flows or directly through the line 25 to the top: solid components of the prayer: greater: than Ö; 075-rnm ^ and 'pumped: will; This liquid: can return to · the dry weight; d ^ r; Fixed parts of the? Betbns washing-out can be used and can from ^: the 30 smaller: than ¹ 0.07SmHi'üttd · ^ Is pifferenzzbetween: the 'vessel 9 by means of the pump 20 through the line 21, sum of these two · weights = lirld' dem ": Ainfangs - or from the container 26 through the line 27 to the weight of the sample, the water content: uppermost sieve; of the sieve box. 12; returned

become ;: it, arises; in: this way a circuit gate after the usual'Methodensvdrzühehrherti ^ that of the washout liquid; which continues for so long. 35 share · att ";. Feinstbestandteiien) of the:; beli this ^ Aue-bis..sämtliche aggregates are washed ^clean: screening ;: obtained ;, must: - the; amount..", The · "Zeritriiugen - The; upper part 23 of the line ^ 21 "is flexible · and ^{residues; counted 1} and: voftT weight 'of the ⁷ fixed -. has on the mouthpiece ·, a; handle - which enables components - larger" than 0.075rnfn; be deducted '; I-lichtj the contents of the sieves, from: Hand on the whole ■■ With the: Bestiffimungides; Totalgewichtes'deFBbtÖh--

Spray the sieve surface. 40 sample, des-TfockengeWichtösider; Festrjestä'ndteiie'dess

The washout! the aggregate is made of ^ above 'concrete; larger than'- Ö, Ö755mm "itticH .de ~ s- <dry- · her sieve-wise: made;, first the-:. weight of the; solid constituents-smaller ^r al ^ 0.075 ^ πίίή 'coarse aggregates: on, the upper . seven outgoing der'mit * the beschriebenfeö · VomchtungA dureh ^'1 -waschen Sobald- feasible approach is the aggregates of a ~ screen clean finished:.. · For ^ this ^one gefündferieö · _sihd: the screen is lifted undün a ^ dry! --45; Values can: daftn. WäsisergfeHalt ¹ and: '' Zefnent- "oven, brought ;. Both; lower; fine mesh: content ^: dar ^; Pfobe: bechnetiwetdeni-Sieben must 'die- washing: especially, thoroughly: On this occasion käiini aach'- the-

happen;. The; on: deni sieve set. 12 'acting of the units ^ b'estiröfrttiWeräeiii

For this purpose V leaflet drawing

Claims (6)

1 2 and tensile strengths, the volume weight and patent claims: if applicable, the modulus of elasticity and other physical properties. The usual norms 1. Device for producing grain sizes are based on assessing the concrete fractions of fresh concrete for examination quality, primarily on the strengths, purposes, with a number of sieves which are used 28 days after the adversary has been brought in Sieves lying one on top of the other with von tons can be detected. mesh size increasing from bottom to top, ^{- 'fC} in which a fresh concrete sample is preferably carried out with the relatively large .. time between Alcohol washed out and sieved in io the moment of pouring the concrete and the different grain size fractions split up time of assessment of the quality of the material, is characterized in that which is conditioned by the setting time of the cement Set of sieves (14, 15, 16, 17) above one of which has significant disadvantages. If z. B. Spindle (4, 5) of a centrifugation device. after a period of one month after carried centrifuge beaker (6) and found 15 pouring of the concrete on a structure is supported transversely to the axis pivotable that the prescribed for certain components and that a pump (20, 24) is provided, the strength values have not been reached, so it is, the one overflowing from the centrifuge beaker (6) at today's construction rate, usually too late, Wash-out liquid in the circuit in the top one in order to prevent the elements concerned from breaking off The sieve (17) of the sieve set returns. 20 to think about. 2. Apparatus according to claim 1, characterized recently a method for the analysis of records that the sieve set (14, 15, 16, 17) has been developed around fresh concrete, which is the exact one support rod (10) pivotably arranged, determination the following properties of the fresh concrete or mortar to be found under the one cooperating with the sieve set are permitted:
Vibrator (18) carries. 25th 3. Device according to claim 1, characterized in a) cement content,
shows that the centrifugation device for b) water content, Recording of the granulometric composition from the centrifuge beaker (6) c),
The outflowing washout liquid has a collecting channel (8) which opens into a collecting vessel 30. In principle, it consists of a washout of the (9). . . concrete or mortar that has not yet set 4. Apparatus according to claim 3, characterized by means of technical alcohol and separation of the indicates that the pump (20) is connected to the ultra-fine material collection vessel contained in the wash-out liquid (9) is connected. parts (cement and rock flour). 5. Apparatus according to claim 3, characterized in that it is known to control the sieve curve of indicates that the pump (24) has a sieve directly on slams during concrete production Collective channel (8) is connected. device with superimposed, vibrating 6. Apparatus according to claim 5, characterized to use sieve box, wherein the mesh size indicates that the collecting channel (8) decreases with one of the individual sieves from top to bottom. . Overflow (28) is provided, which is in a receiving 40 In a known device for controlling the vessel (29) opens. Composition of fresh concrete before the Ab bind a fresh concrete sample in a screening device with several consecutive arranged sieves of increasing mesh size 45 Stirring or shaking in a water bath and washed out in different grain size fractions The invention relates to a device for manufacturing 'separately. The through the sieve with the smallest mesh of Grain size fractions of fresh concrete are used for large, continuous fine components Investigation purposes, with a number to one- by sedimentation on the basins of the washing sieve set united, superimposed sieves with 50 containers excreted. For the control of from bottom to top increasing mesh size, fresh concrete is the exact determination of the cementine which a fresh concrete sample preferably contains, i.e. the proportion of fine components Alcohol washed out and of decisive importance by sieving in the sample. To the different grain size fractions is divided. Determination of the cement content of the sample At the moment, the concrete is being collected on a construction site. subjected to different controls, which are dried and weighed in two. By regrouping can be broken down. - 'stir and shake the sieve device in the water bath' are in this known device a) testing of raw materials, d. H. Cement fines initially in the liquid in the Aggregates, water, additives, etc. suspended before the 60 wash tank and in the subsequent one Concrete. On the basis of the results of this sedimentation, you will not only be involved in investigations the actual concrete container base, but also on the container walls, is formulated and the concrete preparation and sieves knock down, and it becomes difficult machine on the construction site may be one or even impossible, the totality of the finest adjustment. 65 components of the sample to collect and dry, b) The tests on the finished set so that with this device the cement content of the Concrete, normally 28 days after the first trial, can only be calculated approximately, generally include the pressure. The sedimentation of the fines also takes a long time.