DE19505008A1 - Steel fibre-reinforced floor mortar - Google Patents

Abstract

A fibre-reinforced floor mortar, for thin layers anchored in the substratum, consists of about 1/3 wt. parts cement with conventional setting additives, 4-10 wt.% steel fibres with a thickness/length ratio of 1:6-10 and sand or hard material of 0-4 mm particle size fraction, the mortar layer being 1.5-2 cm thick.

Description

Under thin-layer screed in this document in construction Repairs to existing, especially oiled or otherwise contaminated, floors to be used Screed with a non-self-supporting layer thickness Roger that.

When repairing oils, cutting aids etc. Chemical contaminated floors under Object renovations focus on two aspects:

• - the existing height offset of the doors, windows or similar Reference dimensions do not allow a layer to be applied a self-supporting layer thickness and
• - The entire construction process requires the fastest possible Reusability of the floor.

In the prior art, these problems are solved in two ways solved:

1st way

The existing old floor becomes a self-supporting one Layer thickness of the new floor milled or otherwise removed, transported and disposed of as special waste. After that becomes a common screed layer in self-supporting Layer thickness of at least 5 cm introduced. This is time consuming, costly and material intensive. Furthermore, the Disposal of hazardous waste and machine wear cost-increasing factors, so that costs of 455 DM / m² must be expected. So this procedure can no longer economically sensible.  

2nd way

Application of a thin-layer screed based on epoxy resin Anchoring in the subsurface and steel fiber reinforcement. This System causes somewhat lower costs of approx. 300 DM / m². It is indeed used by manufacturers as material to be supplied offered. However, this is unrealistic because the processing only by specially trained personnel with approval under consideration the special occupational safety, storage and Disposal regulations for both the raw materials and may also be carried out for waste and auxiliary materials. This Ultimately, this means that only specialty companies Special machines can do this processing and then Refurbishment companies these special operations as Subcontractor, with all the disadvantages of scheduling and the known additional cost of running Work outside the place of work, must use, so that the above Costs will increase. Also increase costs the disposal of waste and auxiliary materials that are considered Hazardous waste are classified.

Both solutions must in the future because of the increasing Disposal fees for hazardous waste with increasing costs be counted.

The subsoil anchors suggested in the second way are (e.g. after EP 017.154, DE-OS 29 12 166 or DD-WP 203.765) for Plastic screeds also known and used successfully, like the proposed use of steel fibers (e.g. after DE-OS 27 54 218, DE-OS 37 39 997, DD-WP 264.420) for general Concrete parts or shotcrete.  

Despite the popularity of the described means and the Need for easy to handle and by everyone Construction materials that can be used in construction operations have so far been Building materials industry the proposed according to the invention Solution did not go.

The invention specified in the main claim is the problem to reduce costs and process through every renovation company without additional training of the Personnel, without additional occupational safety law and without to enable special disposal requirements.

This problem is covered by a thin layer screed Anchoring in the subsurface and fiber reinforcement, which consists of around 1/3 Parts by weight of cement per se for cement hardening known additives, 4-10 wt .-% steel fibers with a Thickness / aspect ratio 1: 6 to 1:10 and sand or hard material There is grain size 0-2 and a layer thickness of 1.5-2 cm owns.

The advantages achieved with the invention are in particular in that no hazardous waste requiring disposal, neither by Milling off the old floor using processed chemicals, more is incurred and that the thin-layer screed from any construction company without occupational health and safety Special measures can be processed.  

An embodiment of the invention is in the drawing shown and will be described in more detail below.

Show it:

Fig. 1 schematic section.

The following reference symbols are used:

1 concrete slab (available)
2 dowels
3 anchors
4 thin-layer screed

In a concrete floor to be renovated, dowels and Anchor attached. Then a thin-layer screed becomes liquid introduced and subtracted according to known technologies. Of the Thin-layer screed settles in a preferred Embodiment in its dry matter as follows:

• - 30-40% by weight cement (consisting of 500 - 600 kg alumina cement, 200-300 kg Portland cement, 40-60 kg gypsum, 40-60 kg hydrated lime, 10-15 kg tartaric acid, 380-500 g Lithium carbonate, 1-3 kg of soda and 2-6 kg of casein or 1-3 kg lignin sulfonate)
• - 4-10% by weight steel fibers with a thickness of 1-3 mm and a length of 10-18 mm
• - 40-50% by weight hard material of the grain fraction 0-4 mm

and is turned on with water.

After about 3 hours, the thin-layer screed can be walked on and after The thin-layer screed is fully loadable for 24 hours.  

The following strength values were determined experimentally:

The particular advantages of the invention Thin-layer screeds are therefore a short setting time, a short one Drying time and quick installation.

Claims (1)

Thin-layer screed with anchoring in the background and fiber reinforcement, characterized in that a thin-layer screed made from around 1/3 parts by weight of cement with additives known per se for cement hardening, 4-10% by weight steel fibers with a thickness / length ratio of 1: 6 to 1:10 and sand or hard material of the grain fraction 0-4 and has a layer thickness of 1.5-2 cm.