DE643338C - Process for improving the properties of hydraulic binders - Google Patents

Description

Process for improving the properties of hydraulic binders Many requirements are placed on hydraulic binders. One tries, therefore, to improve their properties by various additives, and demands of these, that they have the strength, room resistance. Resistance to chemical gel fluids, waterproofness, adhesive strength, etc. increase and a reliable and bring about steady hardening. So z. B. Chlorides, IFluorides, nitrates, Sulphates, phosphates, alkali aluminates, silicates, carbonates and rhodanates and others Use salts as additives to the Zetnent or to the Annachewasser. For waterproofing of the building materials mentioned have various organic and inorganic colloids and emulsions and dispersions have found their way into practice. For the production It has been proposed to use oxalic acid as an additive for saltwater-resistant concrete structures to use, and to Erlhölutng the initial strength of cement is after a tannin added to other known processes.

Strangely enough, most of the remedies work with the desired one favorable effect a disadvantageous change in the properties of the building materials in hand. For example, the addition of calcium chloride increases the strength and acceleration of the setting, on the other hand, causes strong changes in space at the same time emerged. Organic substances may have sealing properties, but impair the strength and are subject to aging and decomposition influences. Trass and Si materials can also have a sealing effect, but increase shrinkage.

It has now been shown. that by adding small amounts of organic Oxic acids and their compounds and derivatives have the properties of hydraulic Can affect binders in an extraordinarily beneficial way. without that at the same time the disadvantages arise that other additives entail. Have investigations come out that3 z. B. myic acid, citric acid, sugar acid, etc. and their salts the have a peculiar effect of increasing the plasticity of the mortar and concrete, so that it is possible to achieve the dyke plasticity with a significantly lower addition of water to achieve, as without the addition of the substances mentioned. what an increase in strength of mortar and concrete means.

Because through the use of organic oxy acids and their compounds If the water-cement factor can be decreased, this also becomes a decrease the pore volume and thus an increase in the specific weight of the mortar and concrete. At the same time, Glas Sch "vinden is approximately proportional to the Reduced water reduction and increased density.

The mentioned moth also affect @ie setting time, by delaying the setting of the mortar and bleton. last property permitted. the setting time of full raw clit relli by full or partial replacement of the and to influence the binding regulator known per se by organic oxyacids.

It has already been suggested that wine barrels be made of cement with a cement plaster to provide. the Winstein is added in quantities of about @ n ° 0. With this well-known Adding tartar to cement, however, is merely a hasty chemical Discharge of cement and its ability to react with tartaric acid To diminish wine. By the known method, the lime of the cement is supposed to be as a whole or mostly saturated by the added tartar. The mechanical The properties of the cement, however, are adversely affected by the addition of 20% tartar influenced. In contrast, the invention is an increase in the Plasticity and strength, i.e. a general improvement in the mechanical Properties of the cement. which are already full of alcoholic acids due to very small additions and their derivatives is effected during larger amounts (over 5 @ g t already disadvantageous works.

It is also known to use protein as an additive to cement and in doing so, salts of ricinoleic acid can also be used to reduce foaming. In contrast, your additive is full of alcoholic acid according to the invention not about the prevention of blueprint, should only be used Increasing the plasticity and improving the mechanical properties of the Cement. Preventing the formation of foam is out of the question, eia wedge foams Substances such as protein pods. Find use.

The additions made by the invention are full of otxy acids and their Veroilldullgen induced setting delay can if necessary through known additions of oxylating agents, such as fermatganat, chromate, Bichronate, chlorate etc .. or other types of hydraulic binders, such as I to 2% electrocement at 7777 Portland ltnent, avoided and regulated. olne because this would impair the other beneficial effects of the oxysattres Merden.

Incidentally, there can be no further improvement in properties hydraulic mortar, if one also adds alkali pllosphates, all of which already resemble the properties of hydraulic bits Way, i influenced like the txy acids. An addition of 0.5% sodium lipid phosphate Na2HPO4 @, calculated on glass cement weight, reduced e.g. B. the water requirement about 5%. an addition of about 0 @ 2% (aluminum tartrate um7l about 12%.

Compounds with finite sesquioxides are also advantageous Fluorine or oxalic acid has been found in oil or easily dispersible form. how z. K potassium aluminum fluoride. Aluminum oxalate aluminum iron oxaht etc.

The effects of the above-mentioned stolts are very beneficial when used with such substances are used. the quick mapping, high strengths and cause increased chemical resistance. For example, you can a mixture of alkali aluminate- and use alkali carbonate solution with a specific face of about i, i. This latter mixture has its own characteristics. except for the greatest reduction in the setting time the initial fixation to increase and the adhesive strength of the attached To redeem Zumentes in great measure. The same effect can be achieved with the individual components cannot be achieved.

Exemplary embodiments I. A mix of I part Portland cement. 3 Parts of sand times 5 parts of gravel will cure with 0.7 of a 0.18% sugar acid solution turned on. A pourable concrete mass is created.

2. To a mix of Ino parts of portland, 400 parts of sand and 60o parts of gravel are hurriedly homogeneous mixture of 100 parts of wine satire with parts of molten cement and processed in the usual way to Bkon.

3. M7a2n dissolves 6 parts of calcium carbonate and 4 parts of potassium alatinate in so much water. that a solution of the specific gravity I, o9 arises. Besides one adds to this solution still o.5% precipitated Catliumalultilllllmfluorid and 0.2% o pulverized tartar as well as o.25% @ dry thought Weldon sludge and wetted They're gettin 'on full of cement. The solution can also be used fine or diluted of mortar can be used by e.g. Et. Finite of the threefold diluted solution hurry mixture should elilem Tfeil Portland cement and 2 parts sand to rapidly hardening Processed mortar. Such a mortar is suitable for the mortar spraying process because of its increased adhesive strength suitable.

Claims (5)

PATENT CLAIMS: t. Procedure for improving the properties hydraulic binder, characterized by the addition of less Amounts of alcohol acids or their compounds and derivatives to binders or for mixing water. 2. The method according to claim I, characterized by the further Addition of soluble phosphates. 3. The method according to claim I and z. marked by the further addition of compounds of sesquioxyden with fluorine or oxalic acids. 4. The method according to claim I to 3. characterized by the further addition of Abhindlel accelerators in a manner known per se. 5. The method according to claim 4, characterized by the addition of oxidizing agents.