DE2944910C2 - Method for jointing paved surfaces made of natural stone - Google Patents

Description

30th

The invention is a method of grouting of paving surfaces made of natural stones according to the preamble of claim I.

In a known method of this type ("Straßen- und Tiefbau", No. 6, -964, page 697), the jointed a road surface was peeled off with water about an hour after the trass lime mortar had been slurried in to remove the excess mortar from the ceiling. By purification may in this case however are spoken only partially, on the one hand because after a short setting time, a thin ^r mortar film adheres to the surface of the paving stones, and since the paving stones on the other hand troughs jnd have depressions in which the still present even after a spraying mortar abbindet . Such impairments cannot be avoided with natural stone paving, even with mechanical cleaning at the same time.

It should be noted that when laying natural stone pavement two contradicting one another Facing claims. On the one hand, a joint bond that is as resistant as possible is required, the only by using a high quality! Cement-mortar mix can be achieved, but that on the other hand, it also adheres to the surfaces of natural stones where this is not desired, namely on the exposed stone surfaces from which the hardening or already hardened mortar mix difficult to remove again. The lukewarm treatment, especially in the area of pedestrian zones, Using high pressure water flushing devices and self-collecting brooms can cause serious damage and you think about releasing individuals Remove stones from the pavement.

Setting retarders known in the construction industry are not suitable for use when grouting natural stone paving surfaces with a flowable, or at least moist, mortar mixture for various reasons. So the iör have such paved areas 3t.iiicuitt.iic iviraviiuiigarci l

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However, it should be noted that the setting retarders are known to accelerate when incorrectly metered can work. In any case, tests have shown that with the known setting retarders Desired cleaning effect of mortar residues and cement paste residues on natural stone paving surfaces, which have been grouted with a flowable or at least moist cement-mortar mixture, not can be reached.

The invention is based on the object of the method specified in the preamble of claim 1 to improve so that a contamination of the stone surfaces to a greater extent and without Impairment of the joint bond is prevented.

This object is achieved according to the invention by the characterizing part of claim 1 Claims 2 and 3 are particularly advantageous developments of the method according to the invention marked

The cationic surfactants are used in a variety of ways become known from other types of applications, such as. B. as emulsifiers in processing bituminous materials for black pavement production in road construction, as emulsifiers in food ^ rich and in the petroleum refinery, aL> anti-corrosion agent for metals or as a flotation agent in various areas of industry, as well as bactericides or epoxy hardeners, but not for Treatment of natural stone paving surfaces.

Through the outwardly oriented organic Chains of kaiionic surfactants is a subsequent Hydrophobing the surface of the Zemsntpartike! Are cement particles achieved in such Way completely wetted, the setting of the water film can occur due to the infiltration of the water film excess mortar mixture by preventing the access of water necessary for setting the cement particles no longer take place. Quaternary ammonium compounds are particularly suitable for this as a spray.

As research has shown, the

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in accordance with the procedures. , one; Flotation effect through = the "surface-active substances used becomes the surface tension of the water present in the excess mortar mix largely reduced, and due to the intensive mixing of the surfactants with the

Foam formation resulting from excessive mortar mix is due to smaller particles of the mortar mix larger and therefore heavier particles separated by the flotation effect, which has the consequence that the Cement separated from the mortar mixture and the remaining components of the excess mortar therefore become so emaciated that their setting is no longer or only incompletely possible The setting of the cement separated from the mixture is disturbed. The flotation effect as a result of the intensive Mixing occurs only at the excess mortar mix on the natural stone pavement, but not in the area of the pavement joints, as the Flotation effect does not occur due to the lack of a thorough mixing of the surfactants with the grouting material can. The joint material therefore remains completely intact

When using the method according to the invention, the procedure is as follows:

After sludging and sweeping into the Most Fäiien liquid mörieimisehung will be the sprayed the entire surface with the spray and the one lying on the pavement Sweep excess mortar back and forth with it a short-haired broom or mop with the Thoroughly mixed spraying agent This procedure prevents the spray agent from penetrating into the already Sludged-in joint dimensions, but guarantees the necessary for the chemical agent to take effect intensive mixing with the excess mortar. This process can vary depending on the amount of cement of the mortar can be repeated once or twice. The pavement is then used to set the Left grout to itself, being merely Care must be taken to ensure that the water content required to set the mortar remains. This requires similar to screed work, for example covering the paved surface with plastic sheeting, if this is necessary because of the outside temperature or because of solar radiation and wind drying

After the appropriate setting time, the excess mortar material on the pavement surface can be removed simply with a sharp jet of water, given ioils brushing off. What remains is a paved area without any contamination Cement veil, but with a completely tight, well-adhering joint.

Due to its ease of use, this method is not only suitable for creating new ones Paved surfaces, but can also be used to renovate paved surfaces, if only deep enough before grouting again Cleaning of the joints by blowing out and the like suitable measures are guaranteed

Claims (3)

Patent claims: 1. Method of grouting paved surfaces made of natural stone, in which first a flowable or at least wet mortar mix, essentially Consisting of sand, cement and water, preferably by sludging and sweeping into the pavement joints and then the Jointed pavement surface is hosed down with water, if necessary with mechanical cleaning, to characterized in that the pavement surface after filling the pavement joints during the processing time of the mortar and before hosing down with a spray on the base Cationic surfactants sprayed and the excess mortar on the pavement with thoroughly mixed with the spray. 2. The method according to claim 1, characterized by the use of quaternary in particular Ammonium compounds as spray media !. 3. The method according to claim 1 or 2, characterized characterized in that the Sprühirittel with the on Excess mortar located on the pavement surface by sweeping it back and forth, preferably with it a short-haired broom or scrubber. The natural stones used in many cases are very different Surface structure with considerable height differences on the laid natural stone pavement act as collecting troughs for the cement-mortar mixture. Because of the very different The depth of the trough must be reckoned with very different setting times for the mortar mixture deposited therein be, with an added complication that the known setting retarders with a subsequent Spraying onto the jointed natural stone pavement surface does not allow sufficient dosage, which is completely significantly because even with one even distribution of the setting delay over the pavement surface larger accumulations of Cement-mortar mixture should naturally be mixed with a lower proportion of setting retarder than smaller amounts of mortar. Mixing is also useful the setting retarder with the cement-mortar mixture little, since then there is always no