JPS60210556A - Additive with prolonged working time for concrete and cementmortar - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an additive with an extended period of action for concrete and cement mortars, consisting of a liquefying component and a slowing component.

BACKGROUND OF THE INVENTION It is generally known that the workability of cement-bonded concrete or mortar mixtures after admixture with water or initiation of hydration decreases more or less rapidly depending on the type of cement. This process, called consistency loss, is temperature dependent and becomes more pronounced as the temperature increases.

This can be determined, for example, by the degree of casting of the concrete or mortar.

Consistency loss has a negative effect on the processing time or the time available between mixing and pouring of the concrete, which has to be transported over long distances in the case of building site concrete and especially in the case of transported concrete. Something unexpected happens.

The desired extension of the processing time of cement-bonded concrete or mortar mixtures cannot be achieved to a satisfactory extent by the incorporation of additives such as customary setting slowing agents or liquefying agents.

It is generally known that even at low dosages setting slowing agents have a strong effect on the strength development of cement-bonded tailing materials.

This occurs, for example, upon the addition of set-retarding agents based on sugars or hydroxycarboxylic acids, phosphates, boric acid and silicofluorides.

For example, a liquefier such as a melamine-formaldehyde-sulphite polymerization product according to West German Patent No. 1,671,017 or a naphthalene sulfonic acid φ formaldehyde resin according to West German Patent No. 2,846,966 is used to form a cement tablet. Or, it is generally known that after being added to a mortar mixture, it quickly loses its action. In concrete engineering practice, this means that the initially advantageous consistency and workability obtained with liquefaction agents decreases relatively quickly, thereby increasing the processing time of concrete from the point of mixing to pouring at the building site. results in a corresponding decrease.

Therefore, attempts have been made to find drugs or methods that can avoid the listed drawbacks.

From West German Patent Application Publication No. 2261659, fluidity of a hydraulic cement base is maintained by repeatedly dispensing a liquefying agent mainly consisting of naphthalene sulfonic acid and formaldehyde resin in a time-limited manner. The method is known.

Other patent specifications, such as West German Patent Application No. 1 696 427 or West German Patent Application No. 2 704 929, refer to melamine, formaldehyde, sulfite resins or naphthalene sulfonic acid,
Additives consisting of a combination of known liquefiers, such as formaldehyde resins, and known set-retarders, such as gluconic acid, heptonic acid, boric acid, orthophosphoric acid and their salts, causing an extension of the setting time of cementitious mixtures. The target is Similar additive mixtures consisting of plasticizing and slowing components are disclosed in DE 2902094, DE 2937835 and DE 3101104 and DE 3141145. It is also stated in the specification.

However, the described methods and/or the additives or additive mixtures have important drawbacks in practical use and do not solve the problem of a rapid decrease in consistency over time. The process requires repeated, time-limited additions of additives, or a large number of additives
This is partly complicated because it necessitates a ranked allocation that is variable depending on the intended use, which is combined with the risk of incorrect allocation. Combinations of known liquefiers and set-thinning agents, as described in the above-cited patent specifications, require high dosages of set-thinning agents in order to obtain a sufficient extension of processability; Furthermore, they have the disadvantage that, during use, they lead to a series of disadvantages, such as insufficient strength, above all premature strength. A need therefore arises for additives that do not have these drawbacks.

Solution 1 of the Invention The problem of the present invention is to provide a concrete or mortar that is easy to process and has a consistency that remains unchanged over a long period of time, the workability of which can be improved without compromising its strength. The aim was to prepare an additive for cement-bonded building materials that would add and with it extend the processing time, but would not have any significant defects or shortcomings during use.

Means for solving the problem This problem is solved using the present invention. The subject of the invention is an additive with an extended action time for concrete and cement mortars containing a liquefying agent and a setting slowing agent, the liquefiing agent containing acid groups containing ketone-aldehyde condensation products and/or It is characterized by being a co-condensation product of a ketone and an aldehyde.

Liquefiers consisting of acid group-containing cocondensation products of ketones and aldehydes are in particular cocondensation products of ketones and aldehydes with acid group-containing compounds and aminoplast-forming agents and/or aromatic compounds and/or condensation products thereof and /or lignin sulfonate resin and/or cellulose
It is a co-condensation product with a gas derivative.

The additives according to the invention can be present in solid form of suitable particle size, for example as powders or granules, and/or in the form of aqueous solutions or dispersions. The solids content of the solution or dispersion is generally from 10 to 70 parts by weight, in particular from 20 to 50 parts by weight. For the use of the additives according to the invention, it is also advantageous to formulate the components of the liquefier and the setting agent separately in solid and/or aqueous solution or dispersion form.

The use of additives according to the invention makes it possible to add liquefiers and slowing agents individually or in mixtures, in the form of solids, such as powders or granules, and/or in the form of water bath liquids or dispersions. The additives according to the invention are used in particular for the cracking of easily processable concrete and cement sortar, in order to reduce the loss of consistency over time.

Acid group-containing ketones used as liquefaction agents according to the present invention●
The aldehyde condensation product is described in West German Patent Application Publication No. 3
As ketones, cycloaliphatic, aliphatic, araliphatic and/or or combination products in which symmetrical or asymmetrical ketones with aromatic groups, in which case at least one group is a non-aromatic group, are used.

The group B of the aldehyde R-CHQ may be, for example, hydrogen, an aromatic or non-aromatic (cyclic or non-cyclic), carbocyclic or heterocyclic group or an araliphatic group, in which a carbon atom or a carbon atom The number of heteroatoms is especially 1~
10, aromatic radicals are for example phenyl or furfuryl, araliphatic radicals such as benzyl, non-aromatic radicals such as cycloalkyl, especially of 1 to C, special alkyl radicals such as methyl, ethyl. It is the basis. The aliphatic group may be branched or unbranched, in which case it is, for example, a vinyl group.

The aldehyde may be substituted with one or several substituents which do not impair the condensation reaction, for example by amine groups, hydroxy groups, alkoxy groups or alkoxy carbonyl groups and/or by acid groups contained in the condensation product. It's okay. It is also possible to use aldehydes with more than one aldehyde group, such as chloride or trialdehyde, which are particularly advantageous in some cases because of their high C. reactivity. It is also possible to use polymeric forms in the case of low M saturated aldehydes such as formaldehyde or acetaldehyde (eg paraformaldehyde or paraldehyde).

Examples of saturated aliphatic aldehydes are formaldehyde (or paraformaldehyde), acetaldehyde (or paraaldehyde); examples of substituted saturated aliphatic aldehydes are 6-methoxynoropionaldehyde, acetaldol; Examples are acrolein, crotonaldehyde, furchlor, 4-methoxyfurfurol, propargyl aldehyde; examples of dialdehydes are glyoxal, glutardialdehyde. Particular preference is given to using formaldehyde as aldehyde.

The ketones used in the condensation product according to the invention are in particular symmetrical or asymmetrical ketones with acyclic aliphatic, araliphatic and/or aromatic hydrocarbon groups, in which case at least one group is non-aromatic. It is the basis. In particular, the hydrocarbon group has 1 to 10 carbon atoms.

Acyclic aliphatic groups are straight-chain or branched, unsaturated, especially saturated, alkyl groups, such as methyl, ethyl, probyl. Aroaliphatic groups are, for example, pencil or phenethyl groups; aromatic groups are, for example, α- or β-
- naphthyl group, especially phenyl group. Cycloaliphatic radicals are derived in particular from alkanones, such as cyclopentane and cyclohexane or their methyl-substituted derivatives. Ketones may be provided with one or more substituents which do not impair the condensation reaction, such as amine groups, hydroxy groups, It may be substituted by alkoxy or alkoxycarbonyl groups and/or acid groups contained in the condensation product.

Examples of saturated acyclic ketones are acetone, methyl ethyl ketone, examples of substituted saturated acyclic ketones are methoxyacetone, diacetone alcohol, examples of saturated cyclic ketones are cyclohexanone, methylcyclohexanone, unsaturated aliphatic Examples of family ketones are methyl vinyl ketone, mesityl oxide, examples of araliphatic ketones are acetophenone, 4-methoxyacetophenone, 4-acetylbenzole sulfonic acid, and examples of diketones are diacetyl, acetylacetone, It is benzolic acetone.

Aldehydes and ketones are used in pure form, but also in the form of addition compounds with acid radicals, for example aldehydes
It can also be used as a sulfite adduct or as a hydroxymethanesulfinate. It is also possible to use two or several different aldehydes and/or ketones.

The total number of carbon atoms or, where appropriate, carbon atoms and heteroatoms in the aldehydes and ketones used according to the invention is selected in particular in such a way that the hydrophilic character of the condensation product is maintained. This therefore depends on the number of acid groups in the condensation product, but also on the ratio of ketone to aldehyde. Advantageous total numbers are from 1 to 11 for aldehydes and from 6 to 12 for ketones.

The molar ratio of ketone to aldehyde V to acid group-introducing compound is generally 1=1 to 18:0.2 to 6, and can be varied depending on the particular purpose of use.

Condensation products can be obtained by reacting ketones, aldehydes and acid group-introducing compounds under alkaline monovalent conditions, in which case a one-pot reaction (Eintop
freaktion). The following methods are possible as embodiments for producing the condensation product: ■. Introduction of ketones and acid group-introducing compounds, addition of aldehydes ■. Charge of aldehyde and acid group-introducing compound, addition of ketone■. Charge of ketone, addition of a mixture of aldehyde and acid group-introducing compound or (for example in the case of sulfites) aldehyde and acid group-introducing compound ■. Charge of aldehyde, addition of a mixture of a ketone and an acid group-introducing compound or a compound of a ketone and an acid group-introducing compound, and (1). For general simultaneous charging of aldehyde, ketone and acid group-introducing compound, method I is advantageous; method I is particularly suitable for the reaction of less reactive components.

The reaction generally begins upon slight heating and then proceeds exothermically, so that it is usually cooled. In order to obtain a homogeneous product or in particular when less reactive starting materials are used, post-heating is advantageous and may last for up to several hours.

The reaction is generally carried out at a value of K8 to 14, especially -1 in the range of 10 to 13. The pH number adjustment can be carried out, for example, by adding hydroxides of monovalent or divalent cations or by introducing acid radical-introducing substances, such as sodium sulfite, which in water baths are added to water under an alkaline reaction. Disassemble.

The reaction can be carried out in homogeneous or heterogeneous phase. The reaction medium used is usually boiling water or a mixture with water, the proportion of water being preferably at least 50 °C.
Weight%. Non-aqueous solvent additives include in particular polar organic solvents, such as alcohols or acid esters. The reaction can be carried out in the open as well as in an autoclave, in which case it may be advantageous to work under an inert gas atmosphere, for example nitrogen.

The condensation product can, if desired, be isolated from its solution or dispersion obtained after the reaction, for example by concentration in a rotary evaporator or by spray drying. However, the solutions or dispersions obtained can also be used directly as such.

As starting materials for the aldehydes and ketones it is possible to use the abovementioned aldehys and ketones, in which case it is also possible to use mixtures of ketones and/or aldehydes. Aldehydes and ketones, even in their pure form,
It can also be used as a compound with an acid group-introducing substance (for example, a sulfite-containing compound). These can be introduced or added in aqueous as well as non-aqueous, for example alcoholic solutions.

The reaction proceeds particularly rapidly and exothermically in the case of aldehydes or ketones with lower alkyl buttons, but is not complete in compounds with sterically hindered substituents, such as methyl probylketone or benzolacetone. A long thermal post-treatment is required for the reaction.

As acid group-introducing compounds, all compounds that introduce acid groups under condensation conditions, such as pure acids, monovalent to 311
It is possible to use salts or addition compounds of inorganic or organic cations of 11i with acids, in particular with the aldehydes and ketones used according to the invention. Examples of this are sulfites, bisulfites, birosulfites, sulphite addition compounds of aldehydes or ketones, amidosulfonates, taurates, sulfanilates, amine acetates.

The co-condensation products of ketones and aldehydes used as liquefiers according to the invention are, for example, the condensation products described in West German patent application P3.315152.0 or by the process described therein. It can be torn.

The condensate compositions according to the invention contain carboxyl, phosphono, sulfino and especially sulfo groups as acid groups, in which case these groups can be hydrogen or oxygen or -N
- may be bonded via an alkylene or 10-alkylene bridge, such as a sulfamide group, a sulfoxy group, a sulfoalkyloxy group, a sulfinoalkyloxy group or a phosphonooxy group. The alkyl A/ radical in the radical preferably has 1 to 5 carbon atoms and is in particular a methyl or ethyl group.The condensation products according to the invention may also contain two or several different acid groups. ℃・.

As aldehydes and ketones for the cocondensation product it is possible to use, for example, the aldehydes and ketones mentioned above for the ketone-aldehyde condensation product.

The molar ratio of ketone to aldehyde to acid groups generally ranges from 1:1 to
18:0.2 to 6, and in this case, deviations can be made depending on the special purpose of use.

As aminoplast products which can be used according to the invention, it is possible to use all aminoplast products customary for aminoplasts, in particular for condensation with formaldehyde, in particular melamine and/or urea, guanamide, zoancyamide. eg aminoacetic acid can also be used. As aromatic compounds it is possible according to the invention to use phenols suitable for the formation of phenolic resins, in particular phenols, cresols and sirenols;
In addition, it is also possible to use reactive, substituent- and/or multi-group compounds, such as naphthalene and its derivatives.

Instead of aminozolast products or phenols, it is also possible to use, in whole or in part, their precondensates or condensation products of various degrees of condensation, such as novolacs.

Acid group-containing aminozolast products and aromatic compounds, such as naphthalene sulfonic acid, can likewise be used.

The lignin sulfonate resin used according to the invention is
Lignosulfonates formed when wood is treated with sodium sulfite (sulfite process) and/or their reaction with formaldehyde and/or sulfonated compounds, such as sulfites, birosulfites or aldehydes - sulfite addition compounds It is a thing.

Cellulose derivatives are in particular cellulose esters, such as acetylcellulose and primarily cellulose ethers,
Tatoeha methyl cellulose, hydroxymethyl cell 4-
cellulose, hydroxyethylcellulose and carboxymethylcellulose.

The proportion of the aminoplast product and/or the aromatic compound or its condensation product, the lignin sulfonate resin and/or the cellulose derivative is generally between 2 and 50 parts by weight, in particular between 10 and 40 parts by weight, based on the resulting condensation product. In this case, an upward or downward deflection is also possible depending on the desired effect.

The cocondensation products can be obtained by reacting the components under alkaline monovalent conditions, which can also be carried out according to the format of a one-pot process. Generally, the aldehyde is added to a solution or suspension of the remaining components, but other methods may be used, such as co-condensation components and/or ketones, aldehydes and acid-transforming compounds or (for example, in the case of sulfites) aldehydes and acid-transforming compounds. addition to the remaining ingredients,
Alternatively, simultaneous charging of all components is also possible.

The reaction generally begins already on slight heating and then proceeds exothermically, so that it is usually cooled. Post-heating is advantageous in order to obtain a homogeneous product or when less reactive starting materials are used, and this may last for several hours.

The reaction is generally carried out at a monovalent value of 7 to 14, in particular within the range of 10 to 12. The river price adjustment can be carried out, for example, by the addition of hydroxides of monovalent or divalent cations or by charging acid radical-introducing substances, such as sodium sulfite, which are hydrated in aqueous solution in an alkaline reaction. Disassemble.

The reaction can be carried out in homogeneous or heterogeneous phase.

Water or a mixture with water is usually used as reaction medium, the proportion of water being preferably at least 50% by weight. Non-aqueous solvent additives include in particular polar organic solvents, such as alcohols or acid esters.

The reaction can be carried out both in an open tank and in an autoclave, in which case it may be advantageous to work in an inert gas atmosphere, for example under nitrogen.

If desired, the co-combination product can be isolated from its solution or dispersion obtained after the reaction, for example by concentration in a rotary evaporator or by spray drying. but,
The solution or suspension obtained can also be used directly as such.

Aldehydes and ketones As starting materials, the aldehydes and ketones mentioned above can be used; mixtures of ketones and/or aldehydes can also be used. Aldehydes and ketones can be used both in pure form and as compounds with acid radicals (for example as sulfite addition compounds). It can be introduced or added in aqueous as well as non-aqueous, for example alcoholic solutions.

The reaction proceeds particularly rapidly and exothermically in the case of aldehydes or ketones with lower alkyl chains, but may not reach complete reaction in the case of compounds with sterically hindered substituents, such as methyl probyl ketone or benzol acetone. This requires long-term thermal post-treatment.

Compounds that introduce acid groups include all compounds that introduce acid groups under condensation conditions, such as pure acids, salts of acids with monovalent to hexavalent inorganic or organic cations, or addition compounds;
In particular, the addition compounds with aldehydes and ketones used according to the invention can be used. Examples are sulfites, bisulfites, pyrosulfites, bisulfite addition compounds of aldehydes or ketones, amidosulfonates,
These are taurine salt, sulfanilate, and amine acetate.

However, the acid groups can also be introduced in whole or in part by acid group-containing aminoplast products, aromatic compounds and/or condensation products thereof or by corresponding acid group-containing lignin sulfonates and/or cellulose derivatives. can.

The additives according to the invention include two or several ketone aldehyde condensation products and/or cocondensation products, or one or several known dispersants with the same, similar and/or different action, surface-active Mixtures with concrete additives or concrete additives can also be used. In this way, the properties of the additives can often be additionally varied or differentiated.

The setting agent may be a known setting agent such as phosphoric acid, phosphonic acid, boric acid, hydroxycarboxylic acid, ligninsulfonic acid or its salt, shields, silicofluorides (which may be present alone or in any combination). Consists of a binder.

Surprisingly, with the additive according to the invention, the workability of cement-bonded building materials, such as concrete, for example, is not significantly impaired when the liquefiers are used simultaneously with binders or binder mixtures. It has been found that it can be maintained for a long period of time without significantly reducing the degree of flow, thus resulting in a significant reduction in slump loss effects.

The degree of incorporation and dosing of the liquefier versus the setting agent depends on the desired time of effect, the composition and temperature of the building material mixture and the ambient temperature. Typically, the mixing ratio of liquefier to setting agent is 10
0:1 to 100:200 parts by weight, especially 100:10 to
The ratio is 100:50 parts by weight.

The advantages of the additive according to the invention over the known processes or additive mixtures are, in particular, the relatively low setter dosage, which leads to significantly more favorable strength values of the concrete and mortar mixtures, especially early strengths. economical due to low additive consumption. Furthermore, the additive according to the invention can be used repeatedly to obtain a satisfactory extension of the processing time.
Therefore, it has the advantage of being easy to use since there is usually no need for complicated post-dosing.

The invention will be explained in more detail with reference to the following examples, but is not limited thereto.

EXAMPLES Preparation Example 1 (according to DE 31 44 673, Example 11) 1000 parts by weight of water, 6 parts by weight of sodium sulfite were added in sequence into an open reaction tank equipped with a Keyaki stirrer, an internal thermometer and a reflux condenser.
60 parts by weight and 580 parts by weight of acetone are charged and stirred vigorously for several minutes. During this time, a considerable amount of sulfite is decomposed and the temperature of the reactants rises to 31-32°C.

Heat the patch to an internal temperature of 56°C (acetone reflux) and add a total of 3 60% formaldehyde solution (formalin) to the reactant.
000 parts by weight are added dropwise.

Due to the strong exothermic reaction, the initial addition of formaldehyde solution should be avoided when formalin is added. is added gradually and uniformly, and the reaction is then waited for to begin (this is manifested by the onset of yellowing of the charge and the increase in the acetone reflux).

Cooling begins as soon as the first signs of reaction are observed. The reaction proceeds under red coloring of the starting material and strong acetone reflux. After this initial phase has stopped, the remaining formalin is allowed to flow in and the temperature is kept at 60-75°C by cooling.

Once the aldehyde has been added dropwise, heat to 90-95°C.
Treat at this temperature for 1 hour.

The cooled condensation product solution has a solid content of 64.5 cm and a viscosity of 25 (!P) at 20°C.

The condensation product is referred to as 1-ton resin' in the examples below.

Production Example 2 (West German National Special Housing Application No. P3315152.0
5860 parts by weight of water, 1664 parts by weight of solid sodium hydroxide, 1250 parts by weight of amine acetic acid, 1567 parts by weight of phenol and 967 parts by weight of κ acetone were charged in sequence into a stirred vessel with an internal thermometer and a condenser. and heat until acetone reflux begins.

A total of 5000 parts by weight of 30% formaldehye V solution is flowed into this charge from a storage tank.

The batch temperature then reaches 98°C by the end of the formalin addition.
rises to ℃.

Following the addition of formalin, the solution is kept at 95° C. for another hour and, after cooling to room temperature, adjusted to slightly alkaline.

The orange-red low viscosity resin solution has a solids content of 66.

Example 1 Bortland cement in a 75 liter forced mixer
A paste concrete was produced using an aggregate of 35F and a particle size distribution curve mA/B of 32.

Cement: 300k9/m3, Aggregate: 1997#/77
13. Water-cement ratio: 0.576, mixing time: 3 minutes, fresh concrete temperature = 20±2°C 0. The degree of spreading was measured immediately after mixing or after 60 minutes, 60 minutes, and 90 minutes, respectively. At an intermediate time, the concrete IJ was soaked with a poultice, and the mixture was soaked once more at 50% each before measuring the degree of casting.
Mix thoroughly for seconds.

In order to investigate the strength development of concrete, from the concrete mixture produced under the same conditions as above, the length of one side was 1.
A 5x15x15cIIL test specimen was prepared and the 2d compressive strength was measured.

Castability and strength tests were carried out on the concrete mixtures listed in Table 1, with and without additives.

The results shown in Table 1 and FIG. In contrast, the combination of melamine formaldehyde sulfite resin and tetrapotassium birophosphate according to German patent no. It is clear that, in order to obtain the same extension of processing time, significantly higher binder dosages are required, while giving rise to distinct disadvantages in terms of κ strength development.

In Table 1, the numbers represent the following = 1...
Blank test value 2...Tetrapotassium birophosphate 0.10%6...
...Liquefier 0.40qb4 according to Production Example 1...
- Liquefaction agent according to Example A of West German Patent No. 1 < 571017 0.40 factor 5 ... Liquefaction agent according to Production Example 1 0.4% + tetrapotassium birophosphate 0.10 factor 6 ... ... 0.4% liquefaction agent according to example A of West German Patent No. 1671017 + 0.10 tetrapotassium birophosphate
% 7...0.4% liquefaction agent according to example A of West German Patent No. 1671017 + 0.4% tetrapotassium birophosphate. ，!
lqb The listed coating is a function of the cement content of the concrete mixture. In additive solutions, the metering relates to the solids content of the solution.

Example 2 A standard mortar with D-tech N1164 from Bortland Cement 35F and CEM-Bureau θ's mixing program Lilemusem (R-IM-OEM) is stirred, followed by mixing with D-tech N116d. The ductility was measured. After this creation, the mortar was covered with a poultice and stored at 60°C, 15 minutes, 60 minutes, 4
The castability measurements were repeated after 5 and 60 minutes. A 60 second mortar remix was performed before each new pourability measurement.

Furthermore, a mortar mixture produced under the same conditions was treated with a pure setting agent (sodium gluconate) and a pure liquefying agent (Production Example 2).
(co-condensation product) and a combination of liquefier and set-retarder were added to carry out the above test of time-dependent casting degree.

According to the results according to Table 2 and FIG. 2, the combination according to the invention of liquefaction agent and setting slowing agent causes a very good time extension of the processability of the mortar at 30.degree. In Table 2, the numbers represent the following 21... Blank test value 2... Sodium gluconate 0.15%3...
...Liquefaction agent 0.7%4 according to Production Example 2
Liquefaction agent 0.7% + sodium gluconate 0.15% according to Production Example 2 Example 6 At 20°C, Bortland Cement 35F and D engineering n1
A mortar with a water-cement ratio of 0.56 was prepared from standard sand according to No. 164 in the manner described in Example 2, and the time-dependent evolution of the degree of casting was determined. The mortar was stored at 20°C.

To the same mortar mixtures produced under the same conditions, a pure set loosening agent {21, a pure liquefying agent (6) and a combination of KIfL agent and set slowing agent were added, respectively, with sodium ligninsulfonate as the set loosening agent, The condensation product according to Preparation Example 1 was used as liquefying agent. For these mortars with additives, control the degree of casting in 1 hour in the same way as above]
Established.

The results according to Table 3 show that the combination according to the invention consisting of a liquefaction agent and a loose binder significantly increases the time of processability of the mortar.

Example 4 The time decrease in pourability of concrete with and without additives according to the invention is compared with each other.

In a 75l forced mixer, Bortland cement 35F, 6CIOkg/m3, particle size distribution curve A/Bx
From aggregate No. 2 1997 ky/@'', concrete with a pourability of 42-43 ky was produced with or without additives according to the invention.

No additives were added to Mixture 1. Mixture 2 contains 1% by weight of the aqueous solution of the additive according to the invention: it contains 19.62% by weight of the liquefaction agent prepared according to Preparation Example 1 and the same ψ of sodium ligninsulfonate and potato a+0.
It contained 75% by weight. Mixture 3 contains i. irrt% was added. Mixture 4 contains 19.64% by weight of sodium ligninsulfonate and 0.75% of sucrose.
One volume of an aqueous solution containing 1:2 was added.

The results summarized in Table 4 demonstrate the good effect of the additive according to the invention on prolonging the processing time of concrete.

[Brief explanation of the drawing]

Figure 1 is a flowability/time curve diagram of concrete with various additives at 20°C, and Figure 2 is a flowability/time curve diagram of mortar with various additives at 60°C. It is a curve diagram. In Figure 1: Line 1...Blank test value +%! 2...Tetrapotassium birophosphate 0.10 connection line 3...
・Liquefied liquid 0.40% line 4 according to Sake Example 1...Liquefied agent 0.40 according to Example A of West German Patent No. 1671017
% Line 5: 0.4% liquefaction agent according to Production Example 1 + 0.10% of tetrapotassium pyrophosphate Line 6: 0.4% liquefaction agent according to Example A of West German Patent No. 1671017 + tetrapotassium pyrophosphate Potassium 0210% Ray γ...West 1 Itsu L! if% liquefaction agent according to example A of patent no.
In Figure 2: Line 1... Blank test value line 2... Sodium gluconate 0.15% line 3...
Liquefaction agent according to Production Example 2 0.7 Coupling line 4... Liquefaction agent according to Production Example 2 0.7% + sodium gluconate 0.15% -340-1

Claims (1)

[Claims] 1. Extended action time additives for concrete and cement mortars containing liquefaction agents and slowing agents, at °C, the liquefaction agent contains acid group-containing ketone-aldehyde condensation products and/or ketone and aldehyde condensation products. Additive with extended action time for concrete and cement mortars, characterized in that it is a co-condensation product. 2. 'The liquefying agent is a co-condensation product of ketones and aldehydes with acid group-introducing compounds and aminoplast-forming agents and/or aromatic compounds and/or condensation products thereof and/or lignin sulfonate resins and/or cellulose derivatives. , the additive according to claim 1. 6. A patent in which the setting agent consists of a setting agent known per se or a combination thereof, such as phosphoric acid, phosphonic acid, boric acid, hydroxycarboxylic acid, ligninsulfonic acid and/or its salts, sucrose and/or silicate. The additive according to claim 1. 4. 2. Additive according to claim 1, wherein the liquefier and the setting agent are added individually or as a mixture in the form of solids such as powders or granules and/or in the form of aqueous solutions or dispersions. 5. Claim 1 used for producing easily processable concrete and cement mortar
Additives listed in section.