FR2701705A1 - Adjuvant and composition for the preparation of hydraulic binders, hydraulic binders thus obtained and process for preparing them - Google Patents

Abstract

Adjuvant for hydraulic binders, characterised in that it consists essentially of at least one soaking liquor or of its constituents, the said soaking liquor originating from the wet milling of cereals, in particular from the wet milling of maize or of wheat.

Description

ADJUVANT AND COMPOSITION FOR THE PREPARATION OF BINDERS
HYDRAULICS, HYDRAULIC BINDERS THUS OBTAINED AND METHOD
TO PREPARE
The subject of the invention is a novel adjuvant and a novel composition which can be used for the preparation of hydraulic binders, in particular with a view to ensuring or improving their homogeneity.

 It also aims, as a new industrial product, a hydraulic binder containing said new adjuvant or said new composition and a method for preparing said hydraulic binder.

 By "hydraulic binder" is meant more particularly any composition, including any mineral powder, capable of forming with water a paste setting and gradually hardening, even in the absence of air.

This definition applies and this list is not the least restrictive:
cements, and in particular those belonging to the group comprising artificial Portland-type cements, Portland-type composite cements, blast furnace cements, clinker slag cements, slag and cement cements, as well as cements of particular uses of lime slag cement type, masonry cement, natural cement, super-sulphated cement, fast curing cement, rapid setting and curing cement, cement for work in low or high sulphate waters ,
- natural or artificial hydraulic lime,
- mixtures, such as mortars, grouts and concretes, based on cement and / or lime, water and aggregates, in particular those belonging to the group consisting of premixed dry industrial mortars, mortars prepared on building sites, mortars pre-dried dry processors, ready-mixed mortars, fluid mortars, injection mortars, grouts and grouts, reinforced or un-reinforced concretes, ready-mixed concretes, fluid concretes, concretes light concretes, lightweight insulating concretes, cellular concretes, fiber concretes, prestressed concretes and exposed concretes.

 A particularly surprising aspect of the present invention lies in the fact that the hydraulic binders, in particular the mortars, grouts and concretes, targeted by the present invention can be of extremely varied natures, in particular as regards the quality of their main constituents and the applications intended hydraulic binders, in particular in the field of building and public works.

 By "main constituents" is meant in particular cement and / or lime, water and aggregates, it being understood that the latter may have very diverse natures and characteristics, in particular as to their origin (organic or inorganic, natural or not), their appearance (particle size curve in particular), their density, their affinity for water (more or less hydrophobic character), their porosity or their mechanical strength.

 It should be remembered that, among other things, the characteristics of a concrete for example, and in particular its density and compactness, are influenced by the nature and the specific characteristics of the aggregates it contains.

For information purposes only, the aggregates listed below can be advantageously used depending on the desired quality of concrete.
- conventional concretes for the construction site or prefabrication (density generally sought: 2200 to 2400 kg / m3): all natural aggregates rolled or crushed, in particular of siliceous, calcareous or silico-calcareous nature,
- apparent concretes (2200 to 2400 kg / m3): aggregates as specified above but also colored aggregates such as porphyries, basalts, granites, diorites,
- lightweight concrete for structures (1500 to 1800 kg / m3): expanded clay or shale, expanded slag,
- light semi-insulating or semi-loadable concrete (1000 to 1500 kg / m3): expanded clay, pozzolan, pumice,
- lightweight insulating concrete (300 to 800 kg / m3): vermiculite, cork, expanded polystyrene, expanded glass, wood chips,
- heavy concretes (3000 to 5000 kg / m3): corundum, barite, magnetite,
- refractory concrete (2200 to 2500 kg / m3): corundum, refractory waste, bricks, slag,
- concrete / screeds for industrial floors (2400 to 3000 kg / m3): corundum, carborundum (carbon silicide), metal aggregates.

 The terminology adopted for mineral aggregates in terms of increasing particle size, is generally the following: fines or fillers (dimensions less than or equal to 0.08 mm), then sands, chippings and pebbles (maximum dimensions of 80 mm), it being understood that for example, the composition of traditional concretes may use discontinuous granulometry (absence of aggregates between 5 and 15 mm for example).

 Moreover, one skilled in the art knows how the water / cement weight ratio (W / C ratio) of a hydraulic binder is an essential parameter of its workability and quality, in particular of its mechanical resistance to compression. and its durability.

 And it is remarkable to note already, that the hydraulic binders targeted by the present invention are likely to have E / C ratios lying in truly very wide ranges and in particular between about 0.05 and about 2 , 0.

As examples, we can indicate that:
so-called "traditional" concretes generally have an E / C ratio close to 0.5,
mortars and fluid concretes have an E / C ratio greater than 0.5 and which may especially be between approximately 0.6 and approximately 0.7,
light insulating concretes may have an E / C ratio of about 0.3 to about 0.5,
- injection grouts may have a ratio
E / C approaching or reaching the value of about 2.0,
- Conversely, hydraulic binders for the manufacture of articles of the "block" type can have very low W / C ratios, especially less than 0.1.

 And one of the fundamental problems faced by the preparer or the user of hydraulic binders is to be able to ensure on all occasions and whatever the field of application, in particular for wide ranges of I / C reports and for very varied natures of aggregates or mixtures of aggregates, a good homogeneity and thus a good workability, said hydraulic binders and without harming the other desired properties of the latter.

 For example, problems of homogeneity arise from the fact that it is appropriate to combine such disparate materials as water, cement and expanded polystyrene beads, which are hydrophobic and therefore difficult to "wettable" as may be the case in the preparation of light insulating concretes.

 Similarly, in applications requiring a high water content (W / C ratio> 0.7), as is the case, for example, in mortars and grouts or fluid concretes, it is necessary to maintain an overall homogeneity so as to avoid bleeding or settling phenomena. Indeed, in the sheaths subjected to the injection pressure or that of the circulation pumps, the mix of mortar, grout or fluid concretes, which are non-homogeneous, undergo a separation of water (more easily pulsed), remains of materials, which causes the creation of aggregates plugs. However, the proper use of grouts, injection mortars and fluid concretes requires that these hydraulic binders are low viscosity and free of flocculated cement grains.

 In the context of the preparation of hydraulic binders for block-type articles, which generally have a very low W / C ratio (<0.1), the problems of homogeneity arise in terms of viscosity nonuniformity of the mixture and thereby even bad pressing conditions of the latter.

 In his incessant search to find new ways to improve the techniques of preparation and implementation as well as the characteristics (time of setting and hardening for example) of hydraulic binders, in particular concretes, mortars and grouts, the A person skilled in the art has up to now designed, developed and exploited industrially various categories of adjuvants.

 By "adjuvant" is generally meant a product whose incorporation at low dose (in practice less than 5% of the mass of cement) to the hydraulic binders during the mixing or before the implementation, causes the sought modifications of such or such of their properties, fresh or hardened.

There are generally three broad categories of additives, hereinafter referred to collectively as "traditional additives": - those which modify the workability of the organic binder and
especially:
a) plasticizers such as, for example, soaps
anionic, lignosulfonates, synthetic detergents
nonionic,
b) plasticizing water reducers such as, for example
for example, desulphurized lignosulfonates, soaps
resin, melamine or naphthalenesulphonates and derivatives,
(c) superplasticizers or fluidifiers such as (for example
example) melamine or naphthalene derivatives
such as sulphonated naphthalene condensates and
formaldehyde and lignosulfonates,
- those that modify setting and hardening
that setting accelerators, accelerators
hardening and setting retarders,
- those that modify certain properties
particular such as air coaches
(lignosulfonates, resin abietates, salts
ethanolamine), gas generators,
water repellents (fatty acids and derivatives
(stearates), dyes, and so-called products
"Cure" such as resins, waxes and paraffins, it being understood that, firstly, the main function of each adjuvant may vary according to its dosage and the components of the hydraulic binder and that, on the other hand, an adjuvant may also have one or more secondary functions that may be independent of its primary function.

 Despite the continuous progress made in the development of admixtures, in particular admixtures modifying the workability of hydraulic binders, up to now, there was no medium that was suitable in wide areas of application. and in particular for wide ranges of E / C ratios and / or for very varied natures of aggregates or aggregates mixtures, to guarantee a regular homogeneity of said hydraulic binders and without significantly impairing all or part of other characteristics sought for these.

 Thus, in the context of the preparation of light concretes, the profession uses, as recommended in European Patent EP 185 583, blood proteins, collagen or gelatin which, by lowering the surface tension of water, on the surface of the aggregates, to ensure better homogeneity of all the constituents and thus prevent said microporous aggregates from separating from the whole of the batch during hardening in the storage molds.

 However, very widely used products such as blood proteins or byproducts (cruor), in addition to the problems inherent in their poor conservation, have an extremely fluctuating technical quality and thus pose problems of non-reproducibility of the characteristics of the product. final product. In addition, the resistance that these products give to lightweight concrete at "young age" (24 hours after molding) is too weak to allow stripping.

 Similarly, by way of example, the sulphonated naphthalene and formaldehyde condensates used to improve the homogeneity of injection-type or fluid concrete hydraulic binders, have, as a side effect, to limit the filterability of the wasted.

 The object of the invention is therefore to overcome the drawbacks of the prior art and to provide a means of guaranteeing a regular basis and this, in wide areas of application and in particular for wide ranges of E / C and / or or for very varied natures of aggregates or mixtures of aggregates, good homogeneity to hydraulic binders and without significantly impairing all or part of the characteristics sought for them.

 And the merit of the Applicant Company is to have found, after much research, that such a means could be constituted by the incorporation within said hydraulic binders, at any stage of their preparation, of at least one water dipping from the wet milling of cereals, or constituents of this water.

 By "cereals" is meant in particular the group containing corn, wheat, barley, oats, rye, rice and sorghum, corn and wheat being preferred.

 The subject of the present invention is therefore a novel adjuvant for hydraulic binders, characterized in that it consists essentially of at least one soaking water or its constituents, said soaking water originating from the wet milling of cereals, in particular corn and wheat. When applied to said soaking water, the term "adjuvant" should not be construed as being restrictive in its rate of incorporation into a hydraulic binder, which incorporation rate may, although not generally preferred, be greater than at 5% of the mass of cement and reach about 10% of said mass. In practice, said level will be between about 0.1 and about 10 *, preferably between 0.15 and 5 weight of cement.

 Particularly advantageously, said soaking water comes from the wet milling corn. Such products are commonly designated by those skilled in the art under the terms "corn-steep liquor" or more simply "corn-steep".

 The adjuvant for hydraulic binder according to the invention is obtainable in various ways and in particular according to the teachings of European Patent EP 26 125 which the Applicant Company holds and in particular in the manner described in line 24 to the line 55, column 3, page 3 of said patent, this passage being incorporated in the present description.

It can also be obtained according to the teachings of the European patent EP 235 530 and the European patent application EP 272 049 and in particular according to the methods respectively described:
- line 45 to line 56, page 2 of the patent
EP 235 530 mentioned above,
- and line 3, page 2 to line 48, page 3 of the
European patent application EP 272 049 sus
mentioned, these two passages being also incorporated in the present description.

 In particular, the soaking water used according to the invention, in particular of the "corn-steep" type, can be used in the state, that is to say as obtained directly at the end of the wet milling of the cereal and have for example a dry matter content (ms) of less than about 15, in particular between 8 and 13%, but also be implemented in a more or less concentrated form obtained in any manner and in particular by more or less evaporation of the water it contains, for example so that the ms of said soaking water is brought between about 40% and about 60%, especially between 45 and 52%. The so-called "steepwater solids" are mainly composed of proteins and amino acids, lactic and phytic acids and are preferably used in a dry form or significantly free of water obtained in any way. their salts as well only mineral salts (ashes).

 In particular, it is possible to use, in the context of the invention, a product of the "corn-steep" type having previously been subjected to any spraying technique and which is in dry form or significantly free of water.

 It should be remembered at this point of the presentation of the invention that, for several decades, cereals and starch producers have sought to value the soaking water from the wet milling of cereals, in particular maize.

 The applications for which the soaking waters are generally intended relate to the fields of animal nutrition, fermentation (antibiotic production in particular) and fertilizers, as is the result of one and / or the other of the patents. EP 26 125, EP 235 530 and EP 272 049 mentioned above.

However, as indicated above, the Company
Applicant has had the merit of finding that said soaking waters, obtained in the state, in more or less concentrated form or in dry form or significantly free of water, could also be advantageously used in the field of hydraulic binders.

 And the merit of the Applicant Company is all the greater if we take into account the great power of application of these soaking waters in the field of hydraulic binders, which embrace, as specified above, a very a wide variety of compositions, especially with regard to their respective levels of water, cement and other components, and with regard to the nature (particle size, density, hydrophobicity, porosity, etc.) of the granules they contain.

 And it is remarkable to point out, as will be detailed further in the examples, that said soaking waters, not only provide or improve the homogeneity of hydraulic binders as varied as lightweight insulating concrete and grout injection, but still they are able to favorably influence certain characteristics (for example mechanical strengths in bending and compression at the young age of light insulating concretes) of articles obtained from these hydraulic binders and this, compared with the results observed with adjuvants traditionally used according to the prior art.

 Following which, the subject of the present invention is the use of at least one soaking water or its constituents, this soaking water originating from the wet milling of cereals, in particular corn or wheat, for the preparation hydraulic binders, in particular with a view to ensuring or improving their homogeneity.

 Without wishing to be bound by any theory concerning the function of "homogenizing agent" of hydraulic binders of said soaking waters which it has personally brought to light, the Applicant Company believes that such a function can be hypothetically connected, while at least in part, to a role of "interface agent" that would fill said dipping water in hydraulic binders, namely the ability of said soaking water to ensure or improve the wetting of microporous aggregates or no, incorporated in grouts, mortars, concrete and lightweight concrete.

 The concept of "interface agent" refers to the concept of reduction of surface tension and a study by CERIB (Center for Studies and Research in the Manufactured Concrete Industry) teaches about lightweight insulating concrete that the good cohesion of the material goes hand in hand with the best possible coating and wetting of polystyrene aggregates, which have a hydrophobic nature (Technical Publication CERIB, FR, Jan. 84, N 67, 31p).

However, if the Applicant Company has thought well to study the possible role of "interface agent" of corn-steep or corn-steep soaking water and thus has found that such products were likely to lowering the surface tension of the aqueous phase of a batch of concrete according to the methodology described in the CERIB publication cited above, the
Applicant company has however been able to observe jointly that such dipping waters had a surfactant activity not significantly greater, or even less, than the adjuvants recommended in the prior art such as blood proteins, gelatin or casein.

However, and as will be described in detail in the examples below, it is found that, surprisingly and unexpectedly, such dipping water can behave, in practice, generally more advantageous than a protein of blood, particularly as regards the parameters:
- maneuverability at young ages and therefore productivity in molded / unmolded articles,
- mechanical resistance to compression after storage at 28 days.

 On the other hand, the Applicant Company believes that the quality of "homogenizing agent" of hydraulic binders that can be attributed to the soaking water from the wet milling of cereals, in particular corn, can be connected, while at least in part, to a function of "water-retaining agent", especially in the context of hydraulic binders having a high E / C ratio such as mortars and injection grouts or pumpable concretes, and / or to a function "Lubricant" in the context of hydraulic binders having a low W / C ratio such as those used for the manufacture of blocks.

 It follows that in any case, said soaking waters can be advantageously used in the context of the preparation of hydraulic binders having a wide range of E / C ratios and the present invention is particularly intended for the use of said dipping water for the preparation of hydraulic binders containing cement having a water / cement ratio (W / C ratio) of between about 0.05 and about 2.0, said dipping water being preferably used to represent from about 0.1 to about 10% and especially from 0.15 to 5 weight of cement contained in said hydraulic binder.

 Such hydraulic binders can in particular consist of light concretes, light insulating concretes, mortars or injection grouts, mortars or fluid concretes.

 It also remains that the adjuvant for hydraulic binder according to the invention is apt, and this is not the least of its surprising qualities, to advantageously replace a very wide range of traditional adjuvants natures and functions extremely variety.

 The adjuvant for hydraulic binder according to the invention, namely at least one soaking water from the wet milling of cereals, can be introduced (as is, in more or less concentrated form or in dry form or significantly free water, especially atomized), at any stage of the preparation of hydraulic binders and without any need to use equipment or other technical means that are usually available to those skilled in the art.

 The adjuvant according to the invention, which is particularly useful for ensuring or improving the homogeneity of hydraulic binders, in particular slurries, mortars, concretes, may in particular be introduced into ready-to-use products or into water. mixing at the time of their preparation.

 It can also be used, as it is, in more or less concentrated form or in dry form or significantly free of water, in particular atomized, in a composition whose dry matter consists of or essentially comprises either cement and / or hydraulic lime, either aggregates (for example expanded polystyrene beads), or one or more conventional additives such as those previously described, or any mixture of at least two of these constituents such as cement / aggregate mixtures, traditional cement / additive (s), conventional aggregates / additive (s) or cement / aggregates / traditional additive (s).

 As a result, there is now a new composition useful for the preparation of hydraulic binders, in particular mortars, grouts and concretes, characterized in that it comprises at least one soaking water or its constituents, this dipping water originating from the wet milling of cereals, in particular maize or wheat, and at least one second component chosen from the group comprising hydraulic cements and lime of all kinds and functions, aggregates of all kinds and functions, traditional additives of all kinds and functions, mixing waters and mixtures of at least two of these constituents.

 By way of example, such a composition, useful in particular for the preparation of hydraulic binders of the light concrete or lightweight insulating concrete type, may in particular contain, in addition to said soaking water from the wet milling of cereals, in particular corn or wheat. , and preferably maize, at least a second constituent chosen from the group comprising hydraulic cements and lime, aggregates for lightweight concretes or lightweight insulating concretes, mixing waters, traditional additives of all kinds and functions and mixtures of at least two of these products.

 In this specific case, the aggregates can in particular be made of expanded polystyrene beads.

 Also by way of example, in the context of the preparation of hydraulic binders of the mortar or grout type or of the mortar or fluid concrete type, such a composition may in particular contain, in addition to said soaking water originating from the wet grinding of cereals, at least one second constituent selected from the group consisting of cements and hydraulic lime for mortars or grouts or for mortars or fluid concretes, mixing waters, traditional additives of all kinds and functions and mixtures of at least two of these products.

 For such hydraulic binders, said composition will preferably contain at least one traditional adjuvant, in particular a superplasticizer or fluidizing type adjuvant, chosen in particular from the group comprising melamine derivatives, naphthalene derivatives, lignosulfonates and their mixtures.

 It will be possible to use, as described in the examples below, an adjuvant consisting of a sulphonated naphthalene condensate and formaldehyde.

 Consequently, those skilled in the art now have a new process for the preparation of hydraulic binders, in particular mortars, grouts and concretes, characterized in that it comprises at least one stage during which one implements at least one soaking water or its constituents, this soaking water from the wet milling of cereals, preferably corn and wheat and especially corn, or at least one composition as described above.

 According to a variant of said method, described hereinafter in the examples, said stage of implementation of the soaking water is carried out prior to any step of implementation of cement.

 And the hydraulic binders according to the invention, which are new industrial products, may in particular be characterized by the fact that they contain at least one soaking water or its constituents, this soaking water from the wet milling of cereals, in particular corn and wheat and especially maize.

 And said hydraulic binders, especially mortar type, grout or concrete, since they contain a cement and have a water / cement ratio of between about 0.05 and about 2.0, call, for their preparation, to a dipping water from wet cereal milling, preferably from about 0.1 to about 10% and even more preferably from 0.15 to 5% by weight of the cement.

 The invention can be better understood from the following examples which show some particularly advantageous embodiments of the hydraulic binders according to the invention, which have improved homogeneity and hence workability compared with binders of the same compositions but free from soaking water from the wet milling of cereals, while at the same time meeting at least the other requirements of industrial practice in this field.

EXAMPLE 1
PREPARATION OF A CONTROL LIGHT AND AN ADJUVANT LOCK
WITH SOFT WATER FROM THE WET MILLING OF THE
BUT (CORN-STEEP), FOR THE CONFECTION OF EPROWETTES
LIGHT INSULATING CONCRETE.

For the preparation of a control mixture is introduced into a RILEM type mortar mixer
CEMBUREAU, 67.5 g of expanded polystyrene beads (75% of the balls have a diameter between 0 and 2 mm, 25% between 2 and 6 mm), 67.5 g of drinking water, 2.25 g of blood proteins marketed by the company FCTC

under the name "ISOLITH", then 225 g of cement type
CPA 55HTS.

 The hydraulic control binder as obtained consists of a mix having a water / cement ratio (E / C ratio) equal to about 0.3.

The same batch is carried out by substituting the blood proteins of the control batch by 4.05 g of soaking water from the moist corn mill, namely Corn-steep called "SOLULYS L48L" marketed by the Company. Applicant and having a dry matter (ms) of about 49%. 6.75 g of lime marketed by the company DUMONT-WAUTIER under the name ROKAL is then introduced, it is allowed to react for approximately 2 to 3 minutes and 0.225 g of methylhydroxyethylcellulose MHEC 15000 PFF marketed by the
Company AQUALON, and finally 225 g CPA 55HTS cement.

 In order to compare mixes of equivalent maneuverability, the W / C ratio of the batch according to the invention, namely containing corn-steep soaking water, is adjusted to 0.46.

 The determination of the constant maneuverability has been carried out in accordance with the requirements of the French standard NF P 18352.

 MECHANICAL RESISTORS IN FLEXION AND COMPRESSION.

 In order to measure the mechanical strengths, prismatic test pieces are prepared in molds 70 mm high, 70 mm wide and 260 mm long, with the moldings previously described.

The specimens thus produced are immediately demolded and stored in a humid room at 20 C and 95%
RH (relative humidity) until the age set for the strength test.

 The measurement of the mechanical resistance to bending is carried out according to the methods of standard NF P 18407.

 The results are collated in Table I.

The values are an average of 5 measurements expressed in megapascals (MPa) and the percentages of incorporation of the adjuvants are expressed relative to the weight of the cement.

TABLE I

<SEP> Product <SEP> Naming <SEP> Manufacturer <SEP>% <SEP> 18h <SEP> 24h <SEP> 2d <SEP> 3d <SEP> 7d <SEP> 28d
<tb> Protein
###
<tb><SEP> of <SEP> blood
<tb><SEP> Cornsteep <SEP> SOLULULYS
<tb><SEP> ROCKET <SEP> 1.8 <SEP> 0.14 <SEP> 0.24 <SEP> 0.47 <SEP> 0.47 <SEP> 0.47 <SEP> 0.59
<tb><SEP> 49% <SEP> L48L
<tb> ms
<Tb>

The measurement of the mechanical resistance to compression is performed according to the NF standard
P 18406. The results are collated in Table II.

The values are an average of 10 measurements expressed in
MPa, and the percentages of incorporation of the adjuvants are expressed in relation to the weight of the cement.

TABLE II

<SEP> Product <SEP> Name <SEP> Manufacturer <SEP>% <SEP> 18h <SEP> 24h <SEP> 2d <SEP> 3d <SEP> 7d <SEP> 28d
<tb> Protein
<tb><SEP> ISO @ TH <SEP><SEP> C @ P @ <SEP><SEP> 1 <SEP> 0 <SEP> 0 <SEP> 064 <SEP> 069 <SEP> 072 <SEP> 080
<tb><SEP> of <SEP> blood
<tb><SEP> Comsteep <SEP> SOLULYS
<tb><SEP> ROCKET <SEP> 1.8 <SEP> 0.19 <SEP> 0.31 <SEP> 0.61 <SEP> 0.68 <SEP> 0.60 <SEP> 0.77
<tb><SEP> 49% <SEP> L48L
<Tb>
During these laboratory tests, the test pieces were demolded before being stored. In an industrial manufacturing process, lightweight concrete baffle elements manufactured are of such dimensions that immediate demoulding is impossible without disintegrating said elements.

It is then understood, from the results expressed in Tables I and II, that the use of a soaking water from the wet milling of cereals, in particular corn, according to the invention has the very great advantage. to give lightweight concretes resistance at young ages (24 h) sufficient to allow handling, which can significantly increase production rates.

 In addition, the strengths obtained between 2 days and 28 days with said soaking water, although they are, in this case, slightly lower than those obtained with a blood protein, remain entirely satisfactory and compatible with the requirements. of the profession.

 MEASUREMENT OF TAKING TIMES.

 The determination of the start and end times of setting is carried out in accordance with the requirements of the standard NF P 18356 on the VICAT probe.

The compositions tested are those described above. The results are collected in the table
III.

TABLE III

Tps <SEP> of
<tb>% <SEP> weight <SEP> Start <SEP> End <SEP> of
<tb><SEP> Product <SEP> Name <SEP> Manufacturer <SEP> E / C <SEP> harden
<tb> of <SEP> Cement <SEP> of <SEP> Take <SEP> Take
<tb><SEP> -ment
<tb><SEP> Protein <SEP> of <SEP> lSOUTH <SEP> CFPl <SEP> 1 <SEP> 0.3 <SEP> 23h04 <SEP> 26h26 <SEP> 3h22
<tb><SEP> blood
<tb><SEP> corn-steep <SEP> SOLULYS <SEP> ROQUETTE <SEP> 1,8 <SEP> 0,46 <SEP> 6:57 <SEP> 9:27 <SEP> 2:30
<tb><SEP> 49% <SEP> ms <SEP> L48L
<Tb>
It is clear from the view of these results that the use of a soaking water from wet corn milling according to the invention has the major advantages, on the one hand to significantly advance the start times and end of setting and, secondly to very significantly accelerate the curing time. Said soaking water thus gives much earlier homogeneity required for the handling of lightweight insulating concrete elements, which induces a particularly advantageous acceleration of the manufacturing rhythms.

 TESTING IN INDUSTRIAL CONDITIONS.

 A trial of fabrication of low height insulating concrete storey elements has been carried out.

Each element has a longitudinal core and transverse cores to ensure solidification with adjacent elements after filling on site with a plastic concrete.

 During this test, in addition to the elements to be bancher, cylindrical specimens of a height of 320 mm and a diameter of 160 mm, in accordance with standard NF P 18400, were manufactured.

 The compositions tested during this test, as well as the order of incorporation of the various adjuvants, are shown in Table IV.

TABLE IV

Step <SEP> Product <SEP> Name <SEP> Manufacturer <SEP> Unit <SEP> 1 <SEP> 2 <SEP> 3
<tb><SEP> ball <SEP> of
<tb> 1 <SEP> - <SEP> - <SEP> 1 <SEP> 400 <SEP> 400 <SEP> 400
<tb><SEP> polystyrene
<tb><SEP> 2 <SEP> water <SEP> - <SEP> - <SEP> 1 <SEP> 20 <SEP> 20 <SEP> 20
<tb><SEP> protein <SEP> from
<tb><SEP> 3 <SEP> ISOLLTH <SEP> @ E @@ <SEP> kg <SEP> 1 <SEP> @ <SEP> @
<tb><SEP> blood <SEP>
<tb><SEP> 3 <SEP> com-steep <SEP> SOLULYS <SEP> ROQUETTE <SEP> kg <SEP> - <SEP> 1 <SEP>
<SEP> liquid <SEP> L48L <SEP> sec
<tb><SEP> corn-steep <SEP> SOLULYS
<tb> 3 <SEP> BOOB <SEP> kg <SEP> - <SEP> - <SEP> 13
<tb><SEP> atomized <SEP> AST
<tb><SEP> 4 <SEP> lime <SEP> - <SEP> ROKAL <SEP> kg <SEP> - <SEP> 3 <SEP> 3
<tb><SEP> MHEC
<tb><SEP> 5 <SEP> 15000 <SEP> PFF <SEP> CULMINAL <SEQ> AQUALON <SEP> kg <SEP> - <SEQ> 0.1 <SEQ> 0.1
<tb><SEP> NOTE: <SEP> 6 <SEP><SEP> mixes for <SEP> 2 <SEP> to <SEP> 3 <SEP> minutes
<tb> CPA <SEP> 55 <SEP> CEMENT
<tb><SEP> 7 <SEP> cement <SEP> kg <SEP> 100 <SEP> 100 <SEP> 100
<tb><SEP> Telur <SEP> FRENCH
<tb><SEP> 8 <SEP> water <SEP> 1
<tb><SEP> (E / C = 0.3) <SEP> (E / C = 0.32) <SEP> (E / C = 0.34)
<Tb>
The test pieces thus manufactured are stored for 28 days at 20 ° C. and 65% relative humidity.

 Measurements of mechanical resistance to compression in accordance with standard NF P 18407, as well as measurements of the density are carried out. The values obtained are collated in Table V.

TABLE V

<tb><SEP> Composition <SEP> 1 <SEP> Composition <SEP> 2 <SEP> Composition <SEP> 3
<tb> Resistors <SEP> to <SEP><SEP> Compression <SEP> 0.7 <SEP> 0.77 <SEP> 0.62
<tb> to <SEP> 28 <SEP> days <SEP> (MPa)
<tb> Mass <SEP> volume <SEP> (kg / m3) <SEP> 341 <SEP> 369 <SEP> 353
<Tb>
The results thus obtained show that a soaking water originating from the wet milling of cereals, for example of the corn-steep or corn-steep atomized type, confers on the lightweight insulating concrete framing members in which said dipping water is incorporated, the characteristics, in particular resistance to 28 days, required by the profession in this field of application.

EXAMPLE 2
USE OF SOILING WATER FROM MILLING
WET CORN (CORN-STEEP) FOR THE PREPARATION OF GROUT
INJECTION.

 It should be remembered that no injection grout intended to infiltrate porous rocks must have, on the one hand, the lowest possible viscosity to be pumped and injected (FANN and MARSH viscosity), and on the other hand, the most possible homogeneity between its constituent elements so as to avoid bleeding (bleeding test) and this, even under pressure (filterability at 1.93 × 10 5 Pa and 6.9 × 10 5 Pa).

 Finally, said injection grout must be able to be validly injected into a porous rock (injection test).

As a control hydraulic binder, the injection grout is prepared in the following manner: 300 g of water are poured into a two-liter beaker
stainless steel - a condensate is added as a fluidizing additive
of sulfonated naphthalene and formaldehyde at 44% of ms

label "RESI N 40" marketed by CONDAT
ADJWANTS 'INDUSTRIES (CIA), - 150 g of "SPINOR" designation cement is then added
As manufactured by LES CIMENTS D'ORIGNY, a hydraulic binder having a
E / C ratio of about 2.0, the whole is mixed with the deflocculating spindle for
10 minutes at 2000 rpm.

Said control hydraulic binder based on fluidizing adjuvant "RESI N 40" is hereinafter referred to respectively:
FORMULATION 1 for a hydraulic binder containing 4 by weight of "RESI N 40" expressed relative to the weight of cement, and
- FORMULATION 12 for a hydraulic binder containing 6 by weight of "RESI N 40" expressed relative to the weight of the cement.

 Furthermore, various injection grout formulations (hereinafter FORMULATIONS 2 to 11 and 13 to 18) containing, besides said product "RESI N 40", various other additives whose nature and percentage of incorporation are described in Table VI below.

 It should be noted that said adjuvants are incorporated into the formulations just before the cement.

 FORMULATIONS 6 to 11, 13 to 15 and 18 containing corn steep as dipping water from the wet milling of cereals, are hydraulic binders according to the invention.

 In addition, a formulation (hereinafter called FORMULATION O - see Table VI) is made free of both "RESI N 40" product and other adjuvant of any kind.

TABLE VI

<tb><SEP> Formulations <SEP> O <SEP> to <SEP> 18
<tb> Percentage <SEP> of adjuvant <SEP> per <SEP> ratio <SEP> to <SEP> weight <SEP> of <SEP> cement
<tb><SEP> Adjuvant <SEP> Name <SEP> Manufacturer <SEP> 0 <SEP> 1 <SEP> 2 <SEP> 3 <SEP> 4 <SEP> 5 <SEP> 6 <SEP> 7 <SEP><SEP> 9 <SEP> 10 <SEP> 11 <SEP> 12 <SEP> 13 <SEP> 14 <SEP> 15 <SEP> 16 <SEP> 17 <SEP> 18
<tb><SEP> 1 <SEP> RESI <SEP> N40 <SEP> CIA <SEP> 4 <SEP> 4 <SEP> 4 <SEP> 4 <SEP> 4 <SEP> 4 <SEP> 4 <SEP> 4 <SEP> 5 <SEP> 5 <SEP> 5 <SEP> 6 <SEP> 6 <SEP> 6 <SEP> 6 <SEP> 4 <SEP> 4 <SEP> 4
<tb><SEP> 2 <SEP> VEPRO <SEP> 95MAF <SEP> VEOS <SEP> 1
<tb><SEP> 3 <SEP> VEPRO <SEP> 75PSC <SEP> VEOS <SEP> 1
<tb><SEP> 4 <SEP> PG / 20 <SEP> LAVIOSA <SEP> 1
<tb><SEP> 5 <SEP> 90 <SEP> - <SEP> 100 <SEP> SCANLEM <SEP> 1
<tb><SEP> 6 <SEP> SOLULYS <SEP> L48L <SEP> ROCKET <SEP> 0.2 <SEP> 0.5 <SEP> 0.7 <SEP> 0.2 <SE> 0.5 <SEP> 0.7 <SEP> 0.2 <SEP> 0.5 <SEP> 0.7
<tb><SEP> 7 <SEP> SOLULYS <SEP> AST <SEP> ROQUETTE <SEP> 0.5
<tb><SEP> 8 <SEP> ALBUREX <SEP> SP <SEP> ROQUETTE <SEP> 0.5 <SEP> 1
<tb> 1 - sulphonated naphthalene condensate formaldehyde 2 - hemoglobin 3 - plasma 4 - collagen 5 - casein 6 - liquid corn-steep 7 - atomized corn-steep 8 - solubilized potato proteins.

 MEASURE VISCOSITY FANN.

 In the bowl of a FANN model 35 SA viscometer using the rotor / stator combination R1-B1, with a radius ratio Rr / Br = 1.0678 and a gap of 0.117 cm, the FORMULATIONS described in the table are poured. VI by adjusting the volume to the height engraved in this bowl.

 The level of the preparation is then adjusted to the engraved line on the periphery of the stator. Then two readings are made: at 300 rpm and 600 rpm.

 The values obtained, expressed in mPa.s, with the various FORMULATIONS of Table VI are collated in Table VII.

 The level of increase of the FANN viscosity or plastic viscosity is determined, for each FORMULATION, making the difference viscosity at 600 rpm - viscosity at 300 rpm.

TABLE VII

<tb> Formulation <SEP> 600 <SEP> RPM <SEP> 300 <SEP> RPM <SEP> 600-300 <SEP> RPM
<tb><SEP> 0 <SEP> 0 <SEP><SEP> 14.5 <SEP> 12 <SEP> 2.5
<tb><SEP> 1 <SEP> 6.5 <SEP> 3.5 <SEP> 3
<tb><SEP> 2 <SEP> 116 <SEP> 123 <SEP> 43
<tb><SEP> 3 <SEP> 42.5 <SEP> 23 <SEP> 19.5
<tb><SEP> 4 <SEP> Too many <SEP> of <SEP> Materials <SEP> insoluble-to-measure <SEP> not possible
<tb><SEP> 5 <SEP> 45 <SEP> 31 <SEP> 14
<tb><SEP> 6 <SEP> 7.5 <SEP> 3.5 <SEP> 4
<tb><SEP> 7 <SEP> 10 <SEP> 5.5 <SEP> 4.5
<tb><SEP> 8 <SEP> 8 <SEP> 5 <SEP> 3
<tb><SEP> 9 <SEP> 6.5 <SEP> 4 <SEP> 2.5
<tb><SEP> 10 <SEP> 6.5 <SEP> 4.5 <SEP> 2
<tb><SEP> It <SEP> 8 <SEP> 4 <SEP> 4
<tb><SEP> 12 <SEP> 6.5 <SEP> 3 <SEP> 3.5
<tb><SEP> 13 <SEP> 8.5 <SEP> 5 <SEP> 3.5
<tb><SEP> 14 <SEP> 10 <SEP> 5 <SEP> 5
<tb><SEP> 15 <SEP> 6.5 <SEP> 4 <SEP> 2.5
<tb><SEP> 16 <SEP> 73 <SEP> 47 <SEP> 26
<tb><SEP> 17 <SEP> 105 <SEP> 73 <SEP> 32
<tb><SEP> 18 <SEP> 11 <SEP> 4.5 <SEP> 5.5
<Tb>
It can be seen from the results of Table VII that proteins of animal origin (see FORMULATIONS 2 to 5) or plant proteins (see FORMULATIONS 16 and 17) generally cause a consequent rise in plastic viscosity. injection grout. Only among the adjuvants studied here in combination with the product "RESI N 40", those consisting of a liquid corn-steep or corn-steep soaking water allow to obtain and maintain a low viscosity to hydraulic binders in which they are incorporated (see FORMULATIONS 6-11, 13-15 and 18).

 MEASUREMENT VISCOSITY MARSH.

In a MARSH viscometer provided by the Company
BAROID, having a mesh grid of 2 mm on its upper part and a flow orifice with a diameter of 45 mm at its lower part, is introduced 400 ml of some of the FORMULATIONS described in Table VI, by sealing the lower end.

 Simultaneously, it starts the start of the stopwatch and the flow of the preparations in a beaker.

The stopwatch is stopped when the 400 ml of preparation has elapsed.

The flow times obtained with the different
FORMULATIONS tested are shown in Table VIII.

TABLE VIII

<tb> Formulation <SEP><SEP> Flow Time <SEP> at
<tb><SEP> viscometer <SEP> MARSH
<tb><SEP> 0 <SEP> 13s71
<tb><SEP> t <SEP> 12S29 <SEP>
<tb><SEP> 6 <SEP> 12s13
<tb><SEP> 7 <SEP> 12s62
<tb><SEP> 8 <SEP> 12s62
<tb><SEP> 9 <SEP> 12s14
<tb><SEP> 10 <SEP> 12s28
<tb><SEP> 13 <SEP> 12s10
<tb><SEP> 14 <SEP> 12S97 <SEP>
<tb><SEP> 15 <SEP> 12s50
<tb><SEP> 16 <SEP> 27s85
<tb><SEP> 18 <SEP> 12s70 <SEP>
<Tb>
It is generally found that the incorporation of an injection grout-type hydraulic binder with at least one soaking water originating from the wet milling of cereals, such as liquid corn steep or atomized corn-steep, does not modify not significantly the flow viscosity of said hydraulic binder.

 On the other hand, the incorporation of vegetable proteins of the solubilized potato protein type has the effect of increasing said viscosity very substantially (viscosity multiplied by approximately 2 - see FORMULATION 16), which is incompatible with the requirements of the technique in this area.

 MEASURE OF SPINNING AND DECANTATION.

 The measurement of the amount of water evolved is carried out on certain FORMULATIONS described in Table VI and this, according to the requirements of standard NF P 18359, in a test tube of 100 cm3 after three hours of rest.

 The volumes, measured in milliliters (ml), are collated in Table IX.

TABLE IX

<tb><SEP> Formulation <SEP> Volume <SEP> of water <SEP> breathed <SEP> (ml / h)
<tb><SEP> 0 <SEP> 15
<tb><SEP> 1 <SEP> 5
<tb><SEP> 2
<tb><SEP> 3
<tb><SEP> 4 <SEP> 1
<tb><SEP> 5
<tb><SEP> 7 <SEP> 1
<tb><SEP> 8 <SEP> 3
<tb><SEP> 9 <SEP> 2
<tb><SEP> 10 <SEP> 3
<tb> It <SEP> 11 <SEP><SEP> 2
<tb><SEP> 12 <SEP> 2
<tb><SEP> 14 <SEP> 1
<tb><SEP> 15 <SEP> 3
<tb><SEP> 16 <SEP> 20
<tb><SEP> 17
<tb> **** Foam too large: impossible to read.

 The results of Table IX show that overall, the incorporation of corn-steep, liquid or atomized, in an injection grout according to the invention, increases the homogeneity of said grout, the latter being, from now on, less subject to the bleeding phenomenon and this, very significantly.

 MEASUREMENT OF THE FILTRABILITY (1,93.105 Pa).

 In the cells of a BAROID press filter 6 ramp equipped with a 325 msh stainless steel grid on which a BAROID filter paper 9 cm in diameter is placed, 200 ml of some of the FORMULATIONS described in Table VI are poured. .

 The cell is replaced in the filtration ramp and subjected to a pressure of 1.93.105 Pa, or about 2 bar of compressed air. The amount of filtrate collected as a function of time is measured in the specimens placed under the cells.

 The values obtained, expressed in milliliters (ml) and in minutes (min) and / or seconds (s), are collated in table X.

PAINTINGS

<tb> Formu- <SEP> Filtrat <SEP> collected <SEP> in <SEP> ml <SEP>
<tb> lation
<tb><SEP> 5 <SEP> 10 <SEP> 15 <SEP> 20 <SEP> 30 <SEP> 40 <SEP> 50 <SEP> 60 <SEP> 100
<tb><SEP> 0 <SEP> 8s <SEP> 25s
<tb><SEP> 1 <SEP> 25s <SEP> 8 <SEP> min
<tb><SEP> 2
<tb><SEP> 3 <SEP> 60 <SEP> s <SEP> 3 <SEP> min <SEP> 20 <SEP> min
<tb><SEP> 4 <SEP> 2min <SEP>
<tb><SEP> 6 <SEP> 8 <SEP> min <SEP> 17 <SEP> min <SEP> 28 <SEP> min
<tb><SEP> 7 <SEP> 25s <SEP> 2 <SEP> min <SEP> 4 <SEP> min <SEP> 9min30s
<tb><SEP> 8 <SEP> 21s <SEP> 48s <SEP> 6 <SEP> min <SEP> 16 <SEP> min
<tb><SEP> 9 <SEP> 57 <SEP> s <SEP> 5min47s <SEP> 20 <SEP> min
<tb><SEP> 10 <SEP> 51s <SEP> 3min25s <SEP> 10 <SEP> min
<tb><SEP> 12 <SEP> 22 <SEP> s <SEP> 1 <SEP> min <SEP> 4min <SEP> 8 <SEP> min
<tb> **** Foam too large: impossible to read.

 MEASUREMENTS OF FILTRABILITY (6.9.105 Pa).

In the cells of a press filter ramp
FANN model 12 BL, provided with a filter paper FANN 90 mm in diameter, are poured some of the FORMULATIONS described in Table VI.

 The cell is replaced in the filtration ramp and is subjected to a pressure of 6.9.105 Pa (about 7 bar) of compressed air. The amount of filtrate collected as a function of time is measured in the specimens placed under the cells.

 The volumes of filtrate collected are collated in Table XI.

TABLE XI

<tb> Formu <SEP> Filtrat <SEP> collected <SEP> in <SEP> ml <SEP>
<tb> -lation <SEP> 5 <SEP> 10 <SEP> 15 <SEP> 20 <SEP> 30 <SEP> @ <SEP><SEP> 40 <SEP> 50 <SEP> 80 <SEP> 100
<tb><SEP> 0 <SEP> 5s
<tb><SEP> 2
<tb><SEP> 3
<tb><SEP> 5
<tb><SEP> 6 <SEP> 5s <SEP> 30 <SEP> s <SEP> 1 <SEP> min <SEP> 2min30s <SEP> 9 <SEP> min
<tb><SEP> 7 <SEP> 20 <SEP> s <SEP> 1 <SEP> min <SEP> 2 <SEP> min <SEP> Gmini5s <SEP>
<tb><SEP> 8 <SEP> 16 <SEP> s <SEP> 45 <SEP> s <SEP> 1min30s <SEP> 4 <SEP> min
<tb><SEP> 9 <SEP> 12s <SEP> 44 <SEP> s <SEP> 4 <SEP> min <SEP> 8 <SEP> min
<tb><SEP> 10 <SEP> 25 <SEP> s <SEP> 2min15s <SEP> 9min20s
<tb><SEP> 11 <SEP> 11s <SEP> 45 <SEP> s <SEP> 3 <SEP> min <SEP> 5 <SEP> min <SEP> 14 <SEP> min <SEP> 21 <SEP> min20s
<tb><SEP> 12 <SEP> 22 <SEP> s <SEP> 4min <SEP> 8 <SEP> min
<tb><SEP> 13 <SEP> 1min50s <SEP> 21 <SEP> min
<tb><SEP> 14 <SEP> 5 <SEP> min <SEP> 12 <SEP> min <SEP> 27 <SEP> min
<tb><SEP> 15 <SEP> 3min25s <SEP> 13 <SEP> min <SEP> 30 <SEP> min
<tb><SEP> 16 <SEP> 20 <SEP> s <SEP> 505 <SEP> 2min30s <SEP> 4min <SEP>
<tb><SEP> 17
<tb><SEP> 18 <SEP> 15s <SEP> 40s <SEP> 1min30s
<tb> too much foam: impossible to read
The results shown in Tables X and XI clearly show the advantage of using, in accordance with the invention, at least one soaking water originating from the grinding of cereals, in particular maize, for the preparation of hydraulic binders, said soaking water to limit the amount of filtered water and the filtration rate and this, by its ability to homogenize the constituent elements of the slurry and even under a high pressure of about 7 bar.

 In addition, said soaking water, unlike the admixtures incorporated in FORMULATIONS 2 to 5 and 17, does not generate any problem of foam formation capable of calling into question its application at the industrial stage.

INJECTION TEST
The injection tests are performed according to a protocol inspired by the NF P 18981 standard.

The equipment used consists of:
- A metal container for receiving the mix, from a EUROMATEST mortar aerometer, this container being provided with its sealing system. Its lid is equipped with a manometer, a nitrogen inlet and a pressure regulating valve,
- A 380 mm high column and 24 mm inner diameter, closed at each end, two plugs N "7 drilled through a steel tube 95 mm long and 4 mm in diameter. Inside this column are placed, against the plugs, a disk 20 mm in diameter of 1 mm mesh and a microporous nylon fabric of the same size,
two metal plates placed at each end of the column, which are interconnected by two threaded rods and which are placed along this column,
- a 60 mm diameter hose connecting the steel tube from the lower end of the column to that placed on the lid of the container and a hose attached to the steel tube of the upper end of the column and which feeds a beaker of 1 1.

 Normal sand from the NEW COASTAL COMPANY conforming to the ISO 679 standard is introduced into the column.

 Ten spatula strokes are given on the side of this column to gently pack the sand. Then the top of the column is closed and 100 ml are injected, previously placed in the injection vessel, by applying a pressure of 1.2 × 10 5 Pa of nitrogen.

 The time required to inject the 100 ml of water through the sand column is measured.

Subsequently, one or other of the FORMULATIONS 1 and 7 described in Table VI and one or other of the FORMULATIONS 19, 20 and 21 containing respectively: FORMULATION 19 (not in accordance with FIG. the invention): 5% of
product "RESI N 40" and 0.5% corn-steep at 49% of ms,
the percentages being expressed in relation to the weight of the
cement, - FORMULATION 20 (not according to the invention): 5% of "RESI
N 40 "and 0.5 t of" VEPRO 95 MF "type hemoglobin, - FORMULATION 21 (not according to the invention): 5% of" RESI
N 40 "and 0.5 of type potato protein
"ALBUREX SP".

 The time required for 20 ml of a batch of each of these FORMULATIONS is measured to cross the sand column.

 With each new FORMULATION tested, we change the sand column.

 Each of FORMULATIONS 1, 7 and 19 - 21 is tested twice.

The results obtained, expressed in minutes and seconds, are given below:
FORMULATION 1: 1st test: 1 min 30 s
2nd try: 1 min 16 s
FORMULATION 7: 1st test: 1 min
2nd try: 1m07s
FORMULATION 19: 1st test: 1 min 27 s
2nd try: 1 min 31 s
FORMULATION 20: no changeover in both
trials
FORMULATION 21: no changeover in both
trials.

 The results above show that grouts according to the invention, namely containing at least one soaking water from the wet milling of cereals, in this case maize (see FORMULATIONS 7 and 19), are perfectly injectable, this is not the case of slurries not in accordance with the invention based on hemoglobin-type adjuvant (FORMULATION 20) or potato protein type (FORMULATION 21).

 In addition, said soaking water does not significantly alter (see FORMULATION 19), or even improve (see FORMULATION 7), the "injectability" of a slurry prepared according to the prior art (see FORMULATION 1). .

Claims (14)

 1. Adjuvant for hydraulic binders characterized in that it consists essentially of at least one soaking water or its constituents, said soaking water from the wet milling of cereals, in particular wet milling corn or wheat .  2. Composition for the preparation of hydraulic binders, in particular mortars, grouts and concretes, characterized in that it comprises at least one adjuvant according to claim 1, and at least one other constituent selected from the group comprising cements and hydraulic lime, aggregates, traditional admixtures, mixing waters and mixtures of two or more of these products.  3. Composition according to Claim 2, for the preparation of hydraulic binders of the light concrete or light insulating concrete type, characterized in that the second component is chosen from the group comprising hydraulic cements and lime, aggregates for light concretes or concretes. light insulators, mixing waters, conventional admixtures and mixtures of two or more of these products.  4. Composition according to claim 3, characterized in that the aggregates consist of expanded polystyrene beads.  5. Composition according to Claim 2, for the preparation of hydraulic binders of the mortar or grout type or of the mortar or fluid concrete type, characterized in that the second constituent is chosen from the group comprising hydraulic cements and lime for mortar or grout or mortar or concrete fluid, mixing water, traditional admixtures and mixtures of two or more of these products.  6. Composition according to claim 5, characterized in that it contains at least one traditional adjuvant, in particular a superplasticizer or fluidizing type adjuvant, preferably selected from the group comprising melamine derivatives, naphthalene derivatives, lignosulphonates and mixtures thereof, the sulphonated naphthalene and formaldehyde condensates being preferred  7. Use of at least one soaking water or its constituents, this soaking water originating from the wet milling of cereals, in particular corn or wheat, for the preparation of hydraulic binders, in particular with a view to ensuring or to improve their homogeneity.  8. Use of at least one soaking water or its constituents, this soaking water originating from the wet milling of cereals, in particular corn or wheat, for the preparation of hydraulic binders containing cement, and in particular mortars grouts and concretes having a water / cement ratio of from about 0.05 to about 2.0, said quenching water being preferably employed to be from about 0.1 to about 10%, and more preferably from 0.15% to 5%, of the weight of the cement contained in said hydraulic binder.  9. Use of at least one soaking water or its constituents, this soaking water from the wet grain mill according to one of claims 7 and 8 for the preparation of light concretes, light insulating concretes, mortars or grout. injectors, mortars or fluid concretes.  10. Hydraulic binder characterized in that it contains at least one soaking water or its constituents, this soaking water from the wet milling of cereals, preferably corn or wheat and especially corn.  11. hydraulic binder according to claim 10, in particular of the mortar, grout or concrete type and in particular of light concrete type, light insulating concrete, mortar or grout, mortar or fluid concrete, characterized in that it contains cement, it has a water / cement ratio between about 0.05 and about 2.0 and that the soaking water or its constituents from the wet milling cereals it contains is preferably about 0 , 1 to about 10%, even more preferably from 0.15% to 5%, weight of cement.  12. Hydraulic binder according to one of claims 10 and 11, characterized in that it has an improved homogeneity compared to a hydraulic binder of the same composition but free of soaking water from wet grain milling.  13. A process for the preparation of hydraulic binders, characterized in that it comprises at least one step during which at least one soaking water or its constituents is used, this soaking water originating from the wet milling of cereals, preferably corn or wheat and especially corn, or at least one composition according to one of claims 2 to 6.  14. The method of claim 13 for preparing hydraulic binders containing cement, characterized in that said step is performed prior to the implementation of the cement.