AU2006319360A1

AU2006319360A1 - Use of an additive as an agent aiding in the removal of formwork

Info

Publication number: AU2006319360A1
Application number: AU2006319360A
Authority: AU
Inventors: Guillaume Francqueville; Uwe Holland; Guy Laurent; Denis Le Cheviller; Nicolas Moins
Original assignee: Construction Research and Technology GmbH
Current assignee: Construction Research and Technology GmbH
Priority date: 2005-12-01
Filing date: 2006-11-30
Publication date: 2007-06-07
Also published as: JP2009517317A; EP1963239A2; CN101321711A; DE102005057507A1; WO2007062854A2; WO2007062854A3

Description

AUSTRALIA VERIFICATION OF TRANSLATION I, Hans Weickmann, c/o Weickmann & Weickmann, Kopernikusstr. 9, 81679 MOnchen, Germany competent in the art and conversant with the English and German languages, hereby solemnly and sincerely declare that to the best of my knowledge and belief the appended translation is a faithful and true translation of international patent application No. PCT/EP2006/011 532 filed on 30 November 2006. Munchen, -0,-0 -1 USE OF AN ADDITIVE AS AN AGENT AIDING IN THE REMOVAL OF FORMWORK Description The present invention relates to the use of an additive as a parting auxiliary in the use of construction chemical compositions. From cost points of view, more and more processes within the construction industry which hitherto have still mainly been carried out manually in situ at the construction site are being replaced by rationalization measures, for example in the form of an industrial prefabrication. All sorts of methods are employed here, which are supported by varying individual measures. Uppermost here are in particular the design of the overall process and an optimization of the process connected therewith, in which a wide range of special additives which influence the processability of the construction chemical composition and the quality of the construction product are also employed. A substantial factor in the industrial prefabrication of concrete construction parts here is the time which has to be spent marginally in order to allow the correspondingly produced articles to remain in the shuttering. In an easily comprehensible manner, the production here is all the more efficient and more cost effective, the shorter the shuttering period. For instance, in the production of green rigid concrete parts which can also be provided with prestressed structural steel reinforcements, processes are employed in which extrusion operations and continuous production of construction parts play an important role. In such processes, one of the main focuses depends on the adhesion of the manufactured article to the shuttering employed. Only by means of an absolute minimization of the adhesion forces can those forces which have to be employed for the removal from the shuttering of the green rigid concrete parts or for the moving on of the boarding in the continuous production be kept so low that the number of the construction parts destroyed or damaged during the shuttering procedure with the correspondingly more rapid operation mode and sufficiently good compaction of the construction chemical compound can be kept within acceptable bounds. The person skilled in the art on-site is here thoroughly conscious of the fact that for this air pore -2 formers often also have to be employed as auxiliaries. Through their use, however, on the other hand the strength of the construction parts is markedly reduced by the air carried in. This should be counteracted by appropriate basic process conditions which, however, predominantly is only a poor compromise. Numerous instances of these are known from the prior art, as construction chemical compositions can be positively influenced with respect to their processability and the product properties by the addition of additives. At this position, in addition to the already mentioned air pore formers, dispersants (flow agents), accelerators, retardants, stabilizers but also "fluid loss additives", rheology modifiers and anti-fade agents may be mentioned by way of example. Numerous representatives of silicic acid derivatives have also been employed for a long time in the construction industry for the production of concrete compositions. Thus, from US 3,135,617 a cement mortar is known which contains 0.25 to 2% by weight of pyrogenic silicic acid. Among the properties of the mortar mentioned therein, a high early strength and the avoidance of "bleeding" are also mentioned. In German Patent DE 25 10 224, a process for the production of concrete articles using a special concrete additive is described, which contributes to an increase in the early strength. This patent right also comprises a concrete additive, which is a stable suspension of 10 to 50% by weight of a finely divided silicic acid having a preferred particle diameter as colloidal silicic acid < 0.1 pm. For the acceleration of the setting of a hydraulic and mineral binder which contains an additive having hydrophilic groups, according to WO 2004/002915 A2 calcium silicate hydrate or else alternatively a silicic acid having a high surface area is added. Both accelerators can additionally contain alkali metals. A concrete composition which, in addition to the hydraulic binder, also contains aggregates, water, silica sol and a super liquefier in the form of a polycarboxylate is known from WO 01/90024 Al. The silica sol used in this case is cationically stabilized and has a particle size between 2 and 200 nanometres. Its use should -3 prevent bleeding and simultaneously not far too strongly adversely affect the processability of the concrete composition. European Application EP 0 931 030 Al records a method for the production of concrete or mortar having increased early strength with a simultaneously good permanent strength. Here, a mixture consisting of a hydraulic binder, aggregates, water and colloidal silica is initially produced, the relative standard deviation of the particle size of the colloidal silica being at least 30%. In the International Patent Application WO 01/98227 A1, a construction material is disclosed which comprises a hydraulic binder, water and an aluminium-modified colloidal silica, which is preferably a silica sol. In the description, it is indicated that such construction materials have an improved strength and processability, which is to be attributed, in particular, to the aluminium-modified colloidal silicon constituents. WO 01/98210 Al claims a defined silica sol composition, comprising a first silica sol component having a wide particle size distribution and a second silica sol component having a narrow particle spectrum. Additionally comprised is also the use of such compositions as additives to concrete or mortar, and concrete and mortar compositions which, in addition to hydraulic binders, aggregates and water, also contain a silica sol composition of the said particle size distributions. The use of colloidal silica components as additive to cementitic materials is described by WO 2004/035473 Al. The silica components employed in this composition must have been produced by a special process, where at least one silane component is mixed with colloidal silica particles in the weight ratio of silane to the silica component of about 0.003 to 0.2. The silica dispersion thus obtainable has a silica content of at least 20% by weight. Mixtures of silicic acid with other additives are also adequately known from the prior art. Thus the Patent Application US 2004/0127606 describes a hydraulic cement composition having an improved bleeding resistance. In addition to puzzolans, this composition also contains polycarboxylate ethers, where the expression "puzzolans" -4 in the further sense can also cover pyrogenic silicic acid. European Application EP 0 602 541 Al describes a thixotroping and setting-accelerating additive for hydraulic or latent hydraulic mixtures, comprising silicic acid esters as thixotroping agents. An improved water resistance and a higher mechanical strength should be imparted to self-flowing mortar compositions such as, for example, levelling compounds and balancing compounds, which contain calcium sulphate hemi hydrate, lime and precipitated or pyrogenic silicic acid and also reactive aluminium oxide (WO 96/20901 Al). As already explained, the main disadvantage in the removal from the shuttering of concrete finished parts consists in the fact that the adhesion forces between the construction chemical composition and the shuttering material still cannot adequately be lowered so far that damage or partial destruction of the construction parts can be avoided. It was therefore the object of the present invention to make available an additive, with which construction chemical compositions can be better processed in the shuttered state or can more easily be removed from the shuttering in the (partly) hardened state. The decisive point of view here was to aim at the minimization of the rejects ratio and at an eased packing of the shuttering elements during the continuous production. At the same time, strength-reducing additives should also be dispensed with as far as possible. This object was achieved by the use according to the invention of an additive comprising at least one representative selected from the series 1.1) suspension of inorganic particles based on aluminium oxide and/or silicon oxide, 1.2) polymeric (meth)acrylic acid derivatives, 1.3) saponificated polyvinyl alcohols, or -5 1.4) water-soluble sulpho group-containing co- or terpolymers having a number-average molecular weight of 50 000 to 20 000 000 g/mol as parting auxiliaries when using construction chemical compositions. In addition to the complete achievement of the task, it was surprisingly found that, for example, by the addition of a silica sol as a preferred representative of the additive 1.1, the necessary initial force for the first movement of a concrete finished part in a mould in the area of continuous production can be markedly reduced. The pressing out of the (partly) hardened product from the shuttering is also made markedly eased compared to the prior art. In addition, by means of this decisive reduction in the forces to be employed for the moving forward or removal from the shuttering, the rejects ratio in the large-scale process could actually be clearly minimized with a simultaneous improvement in the surface properties of the construction articles. Also surprising was the fact that further additives such as, for example, air pore formers can be dispensed with, the amount of hydraulic binder employed even being reduced with simultaneously improved early and final strengths. This is all the more remarkable, as the importance of the influence of the amount of cement to be employed on the final product price and the economy of the production process connected therewith is very well known to any person skilled in the art. Furthermore, it was not to be expected at all that the hoped-for effects according to the task can be achieved both by inorganic and by organic compounds and their arbitrary mixtures. In addition, the respective additives are essentially not restricted to strictly defined compounds, but the respective representatives can be selected from an unexpectedly large number of suitable compounds. The present invention provides as preferred component 1.1 an aluminium-modified colloidal silica, the colloidal silica in particular being silica sol, precipitated silica, silica gel and finely divided silica. Representatives of the type "stable dispersion or sol of amorphous silica" having a preferred particle size of 0.001 to 100 pm, a particularly preferred particle size of 0.01 to 30 pm and a most particularly preferred particle size of 0.1 to 15 pm, are regarded as particularly preferred. The term "colloidal silica" is regarded according to the -6 present invention as corresponding to the definition of K. Iler, as is stated in "The Colloidal Chemistry of Silica" Chapter 4, Wiley & Sons (1979, pp. 312). This definition is a substantial part of the present invention. According to the invention, component 1.2 should in particular be polymers of hydroxyalkyl (meth)acrylate, acrylamide, methacrylamide, 2-acrylamido-2-methyl propanesulphonic acid (AMPS) methyl methacrylate, methyl acrylate, butyl acrylate or cyclohexyl acrylate, which particularly preferably in each case should be present in partly or fully crosslinked form. Water-soluble or at least partly water-soluble polyvinyl alcohols, which preferably should be present in partly saponificated form and which particularly preferably have a degree of saponification of 60 to 96%, are regarded in the context of the present invention as preferred representatives of component 1.3. Polyvinyl alcohols having a degree of saponification of 85% to 96%, particularly preferably of 90 to 96%, are particularly suitable. Generally, the polyvinyl alcohols should have an average molecular weight between 20 000 and 80 000, preferably between 25 000 and 70 000 and particularly preferably between 30 000 and 65 000. The water-soluble sulpho group-containing co- or terpolymers, which characterize the alternative additive 1.4 according to the invention, are essentially known from the prior art, although their inventive use is disclosed. Reference is in particular made to the laid-open specifications DE 199 26 611 Al and DE 190 37 629 A1, and the International Patent Application WO 2005/035603 A1, the respective disclosure contents of which are a substantial part of the present disclosure with respect to additive 1.4. As a preferred component 1.4, in the context of the present invention polymer compounds are employed having the general composition a) 3 to 96 mol% of structural groups of the formula (I) -7

-CH

2 -- CR' CO I co

(CRR

3 )n

CH-

4

-

SO

3 Ma (1) where R 1 = hydrogen or methyl

R

2 , R 3 , R 4 = hydrogen, aliphatic hydrocarbon radical having 1 to 6 C atoms, linear or branched, phenyl radical optionally substituted by methyl groups V = NH or oxygen M = hydrogen, mono- or divalent metal cation, ammonium or organic amine radical n= 1 to5 a = 2 or 1 , b) 3 to 96 mol% of structural groups of the formula (11)

-CH

2 -CR - -CH 2 -CR' I I W N-CO-R I I NRsR 6 Q (Ila) (lib) in which W = -CO-, -CO(O)-(CH 2 )x-, -CO-NR 2

-(CH

2 )x x = 1 to 6 -8

R

5 and R 6 = hydrogen, optionally substituted aliphatic hydrocarbon radical having 1 to 20 C atoms, linear or branched, cycloaliphatic hydrocarbon radical having 5 to 8 C atoms, aryl radical having 6 to 14 C atoms and Q = hydrogen and -CHRs 5

R

7 , and in the case of Q = H, R 5 and R 6 in (lib) together form a -CH 2

-(CH

2 )y-methylene group where y = 1 to 4, R 7 = hydrogen, aliphatic hydrocarbon radical having 1 to 4 C atoms, -COOH or -COOM. and

R

1 , R 2 , M and a have the abovementioned meaning, and/or c) 0.05 to 75 mol% of structural groups of the formulae (111) - CH 2 -- CR' CO -CH 2

-CH-CH-CH

2 y (X)

CH

2

CH

2 V , Z I N R- N-/ R s R 2

R

3 R (ma) (Ilfb) in which the meanings are Y = O, NH or NR s V =-(CH 2 ),x-, ,

R

8 = R 5 or R', -(CH 2 )-SO Ma, -- SO3 e Ma. -J SSO3eMa X = halogen, C 1 -to C 4 -alkylsulphate or Co- to

C

4 -alkylsulphonate, and R', R 2 and R 3 , M and a are as defined above, d) 0.01 to 50 mol% of structural groups of the formula (IV) -9 -- CH 2 -CR z (IV) where Z = -COO(CmH 2 mO)n-R 9 , -(CH 2 )p-O(CmH 2 mO)n-R 9 , RIO

R

9 =H, R1- R where at least one radical R 1 0 , R 11 and/or R 12 must be represented, and saturated or unsaturated, linear or branched, aliphatic hydrocarbon radical having 1 to 40 C atoms Ro = H, C1 - C 4 -alkyl-, phenyl-, benzyl-, C, - C 4 -alkoxy, halogen, cyano, -COOH, -COOR s , -CO-NH 2 , -OCOR s R = an arylalkyl group having a Ci - C 1 2 -alkyl, linear or branched, and C6- C 1 4 -aryl radical R1 2 = alkylaryl group having a C, - C 1 2 -alkyl, linear or branched, and C6 - C 1 4 -aryl radical m = 2 to 4 n = 0 to 200 p = 0 to 20 and R 1 and R 5 have the abovementioned meaning. In preferred embodiments, n = 1 to 150, more preferably I to 100, and P = 1 to 15, more preferably 1 to 10. In special variants of the present invention, in component 1.4 up to 50 mol% of the structural groups a) are replaced by other sulpho group-containing structural units which are derived from methallylsulphonic acid or allylsulphonic acid monomers. According to the present invention, component 1.4 can also consist of 30 to 80 mol%, preferably 35 to 70 mol%, of the structural group a), 5 to 55 mol%, preferably 10 to 45 mol%, of the structural group b), 2 to 30 mol%, preferably 5 to 25 mol%, of the structural group c) and/or 0.2 to 15 mol%, preferably 0.5 to 10 mol%, of the structural group d). A further variant of component 1.4 is comprised by the present invention which has a number average molecular weight of 50 000 to 10 000 000 g/mol. The proposed additive is intended to be used as a parting auxiliary, in particular in the employment of construction chemical compositions, which contains at least one -10 representative of the series hydraulic binder, filler, accelerator and disperser additive. Of course, the proposed additive can also be used according to the invention in construction chemical compositions which contain further functional additives. Particularly positive effects are possible with the use according to the invention in construction chemical compositions which as a hydraulic binder contain cement, lime, gypsum, anhydrite or another calcium sulphate-based binder, where cements of the type CEM I to CEM V and also aluminate cements and any desired mixtures thereof are regarded as particularly preferred. From the series of further ingredients of the construction chemical compositions, the present invention takes into consideration disperser additives in the form of a water reducer and/or of a super liquefier according to standard EN 934/2. With respect to the likewise already mentioned fillers, representatives have shown themselves to be particularly suitable which have a particle size of 0.1 to 100 mm. The breadth of the use possibilities according to the invention is reflected in diverse variants which are claimed as preferred by the present invention. Thus, the respective additive can be added to the mixing water and introduced with this into the construction chemical composition. However, it is also possible to dissolve the respective additive in a dispersing agent and/or to introduce the additive at the same time with the dispersing agent, but separately therefrom. Alternatively or additionally, the additive which is to be used as a parting auxiliary according to the invention can also be applied to the interface of contact of the shuttering with the construction chemical composition before the introduction of the construction chemical raw composition into the shuttering. In this case it acts particularly obviously as a release agent, in order in this way to be able to detach the partially or completely hardened construction chemical product either more easily from the shuttering or else to be able to move the parting in the course of a continuous production without impairment of the surface of the construction chemical product. Of course, the application of the novel parting auxiliary to the shuttering wall is the most economical, as in this case far smaller amounts are needed in comparison with mixing into the construction chemical composition. The introduction of the additive used as a parting auxiliary into the construction chemical composition can on the other hand, however, have the advantage that the components 1.1, 1.2, 1.3 and/or 1.4 used in each case additionally positively influence the processability or the properties of the hardened -11 product, in that the respective component displays its additive action already known from the prior art, for example as a liquefier, retardant or dispersing agent. Finally, one use variant is still also additionally comprised by the present invention, in which the additive is used as a parting auxiliary in the production of concrete finished parts, particularly for the production of green rigid and in particular prestressed concrete finished parts. The amounts in which the respective additive is added to the construction chemical composition depend, of course, on the specific composition of the construction chemical composition; it is recommended, however, to choose amounts which are between 0.001 and 1.0% by weight and preferably between 0.01 and 0.5% by weight, in each case based on the total composition. In summary, it is to be noted that the components 1.1 to 1.4 proposed as parting auxiliaries according to the present invention concerning their structure, but also concerning their ability to function as construction chemical additives, are admittedly largely known from the prior art, but that surprisingly, in addition to their known action in each case, in particular in connection with the production of concrete finished parts or very generally construction parts during whose production shuttering parts are used, a completely new action which can especially be utilized to carry out known processes even more economically. The additives employed in each case are namely surprisingly able to reduce the adhesion forces which act on the interface surface between the construction chemical composition and shuttering to such an extent that the shuttering can now be removed from this without relatively great damage to or destruction of the construction part or can be more easily moved in the case of continuous production. Important in this connection, above all, is also the fact that in the case of moving of shuttering parts the relatively large adhesion forces hitherto known as negative now no longer have to be overcome, so that the parts can slide more easily on or against one another. The following examples illustrate the advantages of the present invention.

-12 Examples The shuttering removal test and the determination of the compressive strength DF after heat treatment are carried out according to the following prescription: The concrete to be characterized is freshly prepared and, immediately after mixing, transferred into an appropriate slipform shuttering for the shaped article to be produced (open top and bottom, closed on the front side and equipped with a removable closure on the reverse side) and consolidated by suitable vibration. The front side of the slipform shuttering is connected by a steel rope to a dynamometer and the latter to an appropriate hand crank. To remove the shuttering from the shaped article, the rear closure of the slipform shuttering is removed and the remaining slipform shuttering is pulled off the shaped article frontwards and downwardly using the hand crank. Fi describes the measured dynamometer variable needed to get the slipform shuttering moving for the first time; Ffb describes the measured dynamometer variable to keep the slipform shuttering moving at constant speed. Concurrently with the filling of the slipform shuttering, appropriate molds for determining the compressive strength of concrete are filled with the corresponding concrete, suitably consolidated and thereafter heat treated at 80 0 C in a covered state for 5 h 30 min. Some of the test specimens thus produced are measured immediately after the heat treatment has ended; the remaining ones are stored in a standard atmosphere for 28 days and are then appropriately measured.

-13 Examples Experiment Experiment Experiment Experiment 4 1 2 3 invention) FORMULATION (kg) (comparison) (invention) (invention) CEM I, 52.5 (binder) 420 380 380 380 Sand 0/0.315 - 180 180 180 Sand 0/4 - 730 730 730 Sand 0/4 825

-

Aggregate 2/8 865

-

Aggregate 4/6 890 890 890 Total water 180 162 165 165 Additive Rheobuild 2000 pF 0.73% 3.10

-

Pozzolith 390HE 0.53% 2.25 Micro Air 200 (air pore former) 0.10% 0.40 Glenium 21 0.90% - 3.40 Glenium ACE 43 0.80% - - 3.05 XASP POUT 1.00% - - 3.80 Silica sol (1.1) 0.42% - 1.60 1.60 1.60 Air pores % 2.0% 1.5% 1.7% 1.5% Slump test 5.5 cm 3 cm 4.5 cm 4.5 cm Shuttering removal test Fi (initial force) 70 kg 65 kg 45 kg 50 kg Ffb (force for moving forward) 30 kg 15-20kg 25 kg 15-20 kg DF after heat treatment 5h 30min, cube (Mpa) 33.7 38.9 37.5 37 28 d, cube (Mpa) 57.3 63.4 66.4 71.4

Claims

1. Use of an additive comprising at least one representative selected from the series 1.1) suspension of inorganic particles based on aluminium oxide and/or silicon oxide, 1.2) polymeric (meth)acrylic acid derivatives, 1.3) saponificated polyvinyl alcohols, or 1.4) water-soluble sulpho group-containing co- or terpolymers having a number average molecular weight of 50 000 to 20 000 000 g/mol as parting auxiliaries in the use of construction chemical compositions.

2. Use according to Claim 1, characterized in that component 1.1) is an aluminium modified colloidal silica, the colloidal silica being silica sol, precipitated silica, silica gel and finely divided silica, in particular of the type "stable dispersion or sol of amorphous silica" having a preferred particle size of 0.001 to 100 pm.

3. Use according to Claim 1, characterized in that component 1.2) represents polymers of hydroxyalkyl (meth)acrylate, acrylamide, methacrylamide, 2 acrylamido-2-methyl-propanesulphonic acid (AMPS), methyl methacrylate, methyl acrylate, butyl acrylate or cyclohexyl acrylate, in particular in each case in partly or completely crosslinked form.

4. Use according to Claim 1, characterized in that component 1.3) is selected from the series of water-soluble or partly water-soluble polyvinyl alcohols, preferably in partly saponificated form and particularly preferably having a degree of saponification of 60 to 96%.

5. Use according to Claim 1, characterized in that as component 1.4) polymer compounds are employed having the general composition -15 a) 3 to 96 mol% of structural groups of the formula (I) -CH 2 -CR' I co V (C R 2 R 3 )n CH---R 4 1 SO3- Ma (I) where R' = hydrogen or methyl R 2 , R 3 , R 4 = hydrogen, aliphatic hydrocarbon radical having 1 to 6 C atoms, linear or branched, phenyl radical optionally substituted by methyl groups V = NH or oxygen M = hydrogen, a mono- or divalent metal cation, ammonium or an organic amine radical n = 1 to 5 a = 1 or 1, b) 3 to 96 mol% of structural groups of the formula (ll) .- CH 2 -CR' - -CH 2 -CR I I W N-CO-R NRsR 6 Q (Ila) (Ilb) in which W = -CO-, -CO(O)-(CH 2 )x-, -CO-NR 2 -(CH 2 )x x = 1 to 6 -16 R s and R 6 = hydrogen, optionally substituted aliphatic hydrocarbon radical having 1 to 20 C atoms, linear or branched, cycloaliphatic hydrocarbon radical having 5 to 8 C atoms, aryl radical having 6 to 14 C atoms and Q = hydrogen and -CHR 5 R 7 , and in the case of Q = H, R 5 and R 6 in (lib) together form a -CH 2 -(CH 2 )y-methylene group where y = 1 to 4, R 7 = hydrogen, aliphatic hydrocarbon radical having 1 to 4 C atoms, -COOH or -COOMa and R 1 , R 2 , M and a have the abovementioned meaning, and/or c) 0.05 to 75 mol% of structural groups of the formula (Ill) - C- H - CR I CO -CH 2 -CH-CH-CH 2 CH 2 CH 2 V z N++ RSN+ 6N R - N - R/ R (ma) (Hib) in which the meanings are Y = O, NH or NR s V = -{CHz)-, " , R = R s or R', -(CH 2 )-SO 3 M, - SOe Mo. -aI~- S0 3 M 8 P X = halogen, Cl- to C 4 -alkylsulphate or Ci- to C 4 -alkylsulphonate and R 1 , R 2 and R 3 , M and a are as defined above; d) 0.01 to 50 mol% of structural groups of the formula (IV) -17 - CH 2 -CR z (IV) where Z = -COO(CmH 2 mO)n-R 9 , -(CH 2 )p-O(CmH2mO)n-R 9 , R 9 = H, R ' R W where at least one radical R 1 0 , R 11 and/or R 1 2 must be represented, and saturated or unsaturated, linear or branched, aliphatic hydrocarbon radical having 1 to 40 C atoms R 1 o = H, C1 - C 4 -alkyl-, phenyl-, benzyl-, C1 - C 4 -alkoxy, halogen, cyano, -COOH, -COOR s 5 , -CO-NH 2 , -OCOR s R " = arylalkyl group having linear or branched Ci - C 12 -alkyl- and C6 C 1 4 -aryl radical R12 = alkylaryl group having linear or branched C 1 - C 12 -alkyl- and C 6 C 14 -aryl radical m =2 to 4 n = 0 to 200 p = 0 to 20 and R 1 and R 5 have the abovementioned meaning.

6. Use according to Claim 5, characterized in that in component 1.4) up to 50 mol% of the structural groups a) are replaced by other sulpho group containing structural units which are derived from methallylsulphonic acid or allylsulphonic acid monomers.

7. Use according to one of Claims 5 or 6, characterized in that component 1.4) consists of 30 to 80 mol% of the structural group a), 5 to 55 mol% of the structural group b), 2 to 30 mol% of the structural group c) and/or 0.2 to 15 mol% of the structural group d).

8. Use according to one of Claims 5 to 7, characterized in that component 1.4) has a number average molecular weight of 50 000 to 10 000 000 g/mol. - 18

9. Use according to one of Claims 1 to 8, characterized in that the construction chemical composition contains at least one representative of the series hydraulic binder, filler, accelerator and disperser additive.

10. Use according to Claim 9, characterized in that the hydraulic binder is selected from the series cement, lime, gypsum, anhydrite or another calcium sulphate based binder and in particular cements of the type CEM I to CEM V and also aluminate cements and any desired mixtures thereof.

11. Use according to either of Claims 9 or 10, characterized in that the disperser additive is a water reducer and/or a superliquefier according to standard EN 934/2.

12. Use according to one of Claims 9 to 11, characterized in that the filler has a particle size of 0.1 to 100 mm.

13. Use according to one of Claims 1 to 12, characterized in that the additive is added to the mixing water and/or pre-dissolved in the disperser additive and/or employed at the same time with the disperser additive and/or applied to the contact interface of the shuttering with the construction chemical composition before the introduction of the construction chemical composition into the shuttering.

14. Use according to one of Claims 1 to 13 for the construction of concrete finished parts, in particular for the production of green rigid and in particular prestressed concrete finished parts.

15. Use according to one of Claims 1 to 14, characterized in that the additive is added to the construction chemical composition in amounts of from 0.01 to 1.0% by weight and preferably of from 0.01 to 0.5% by weight.