The frost-resistant drainage mortar is the perfect combination to our paving joint mortars. The duo with the 5 year system guarantee.

The system solutions

The most frequent damage to paved stone surfaces is caused by permanent, heavy wear. Damage such as grooves, settling, loose, angular stones and displacements within the paved area are the result. For this reason, the correct structure for the paved stone surface must be taken into account when planning. With the drainage-capable bedding mortar ROMEX® - TRASS-BED we offer you the security for a permanent paving joint. As the only manufacturer we offer a 5-year system guarantee when installing the ROMEX® - TRASS-BED in combination with our paving joint mortar. Because we know from experience that the correct construction is the guarantor for a stable paved stone surface.

Products

ROMEX® - TRASS-BED is a frost resistant water permeable bedding mortar for bound constructions.

  • prevents frost damage
  • lessens efflorescence
  • highly water permeable)
  • Compressive strength 35 N/mm2odd

Colour: concrete grey
Standard container: 40 kg bag

Product data sheet
Safty data sheet
Standard specification

ROMEX® - TRASS-BED-COMPOUND is a binding agent for the manufacture of frost resistant water permeable bedding mortar for bound constructions with a recommended mixing ration 1 volume part compound und 4 volume part filler material, like e.g. rolled grit or gravel.

  • prevents frost damage
  • lessens efflorescence
  • highly water permeable

Colour: concrete grey
Standard container: 25 kg bag

Product data sheet
Safty data sheet
Safty data sheet (USA)
Standard specification

ROMEX® - ADHENSION ELUTRIANTS is a trass cement, tempered with plastic, adhesion bridge used for the laying of natural and concrete stone slabs on bonded constructions. It is like a kind of glue for the ideal connection between bedding and stone.

Colour: concrete grey
Standard container: 25 kg bag

Product data sheet
Safty data sheet
Safty data sheet (USA)
Standard specification

The correct installation

Basis for permanent bonded paved stone surfaces


Introduction

Roadway installations in paved stone construction are assigned to the area of road construction. Road construction includes the design, manufacture and maintenance of the road network for motor vehicles, cyclists and pedestrians. The needs of the users of the transport infrastructure are security and ease of use. This is why it is one of the tasks of the road builders to create and maintain appropriate traffic paths. Accordingly, these traffic pathways must have the characteristics of stability, load-bearing capacity, be frostproof, flat and nonslip during the intended period of use, irrespective of the way in which they are used and laid.

In order to achieve this, good planning, thorough preparation of the work, careful construction and the application of the relevant regulations are indispensable. Paved stone surfaces can be made with unbonded or bonded construction. The unbonded version represents the standard method. Bonded paved stone surfaces are produced for special areas of application and have a number of advantages over unbonded paved stone surfaces:

  • safe accessibility of the pavements for pedestrians
  • no weed growth in the joints
  • no washing out of the joints by erosion
  • good absorption of thrust and shear forces without displacement of paving stones
  • resistance to sweepers and high pressure cleaners

The Technical Rules were also supplemented by the FGSV work paper "Fastening systems with paved stone surfaces and slabs in bonded form" published in August 2007. With this development by ROMEX®, we would like to inform you in more detail about the grouting and fixing of paving stones outdoors using synthetic resin paving joint mortars and keep you up to date about this still relatively young, 30 years old method of grouting.


Foundation / Substructure

The ground (foundation) must be prepared for the paving stone construction to be applied - the so-called superstructure - in a professional manner. It is thus to be laid so it is suitable for profiles, flat and load-bearing. This also applies in the same way to a substructure which may be produced, e.g. due to specific local conditions. The suitably manufactured surface of the subsoil / substructure is called "planum". As a rule, the planum must have the same inclination and direction of inclination as the later paving slab (profile-oriented). The paving slab must be designed with an inclination of 2.5%, 3.0% or 3.5% depending on the type of paving stones used. If the ground is at risk of frost, the slope is designed with an inclination of at least 4% so that the water arriving from the superstructure can drain more quickly. However, all layers above the planum, including the paving slab, can be laid using the same incliniation as for the paving slab.

The planum must be made as level as possible so that water arriving from the superstructure does not remain in depressions for an unnecessarily long time thus risking the load bearing capacity and frost resistance of the paved stone construction. Deviations from the nominal height must not be more than + 3 cm.


General information

Paving slabs in bonded form are produced using building material mixtures with binders for the bedding and grout filling (bedding and joint mortar). Mixing methods, in which only bedding or joint filling consists of a building material with binder, do not correspond to the standard construction, but can be successfully used on site depending on the circumstances. Paving slabs in bonded design require special care and profound expertise in the planning, tendering and selection of construction materials as well as in execution. Paving stones for bonded paved stone surfaces should not exceed the usual size (maximum edge length 320 mm). There is still insufficient experience for bonded paved stone surfaces using larger stones. In contrast to the unbonded version, a bonded paved stone construction behaves like a rigid slab (similar to concrete slab construction, hence often referred to as "rigid construction"). This must be taken into account when planning the facings, the fixtures and the formation of movement joints.

Bedding and jointing mortars are to be assembled, manufactured and processed in such a way that they have the necessary material properties in the finished structure. In particular, the attainment of a sufficient adhesive strength between the paving stones and the bedding mortar, on the one hand, and the paving stones and the jointing mortar, on the other hand, is important. Weathering and laying conditions, type, geometry and surface texture of the paving stones as well as the mortar composition have an influence on the adhesive tensile strength. Therefore, not only the product properties determined in the laboratory should be used to assess the suitability of bedding and jointing mortars, but also those which have been determined under building site conditions or in the finished structure. This applies in particular to the adhesive tensile strength values.


Bedding

The tasks of the bedding layer are to dissipate the loads on the paved stone cover with sufficient resistance to deformation into the subsurface and to provide a balance between the remaining unevenness of the upper support layer and the paving surface. Various types of mortar can be used to produce a bonded bed:

  • Hydraulically bound mortar,
  • Plastic - modified, hydraulically - bonded mortar or
  • Resin-bonded mortar (fastest curing (? 24h), good adhesion and flexural strength).

The starting materials for each type of jointing mortar must comply with the relevant technical rules, e.g. norms. In order to assess the basic suitability of a bedding mortar, the determination of certain product properties is carried out under defined laboratory conditions. Bedding mortars must fulfill certain requirements with respect to compressive strength, adhesive strength, resistance to freeze-thaw cycles and water permeability. These are described in the FGSV workbook "Surface coverings with paved stones and bonded slabs" (Edition 2007). The work paper also provides recommendations for compliance with the requirements in the finished structure. The processing of the bedding mortar in principle requires a sufficiently high temperature of the air, the ground and the materials to be processed. This is at least +5° C for hydraulically bonded bedding mortar and at least +1° C for resin-bonded bedding mortar (observe manufacturer's instructions). If special bedding mortars are used, processing at a lower ambient temperature may be possible. At lower temperatures, an extension of the hardening time of the mortar must generally be considered. If the substrate is frozen (<0 ° C), mortar should not be used. In the case of hydraulically and synthetic resin-bonded bedding mortars, the execution of the work must be coordinated in such a way that the solidification start of the jointing mortar only begins after the leveling and setting of the paving stones.