Construction of pavement for vehicles on a steeply sloping ramp.

Descripción sistema

Due to a change of use of the building, the renovation of access ramps to the garage must be carried out. Where a pavement with high mechanical performance is required, executed on a ramp with a steep slope for vehicle use, and finished with a final protection with high resistance to abrasion and wear.

Description

Reconstruction of access ramp for vehicles to garage. With significant slopes of over 18%. Executed with high performance cementitious screed and anti-slip epoxy finish. To carry out the renovation, FERRO
FERRODUR® 600 E mortar with very high mechanical strength and high fatigue resistance, suitable for pavements subjected to high loads, classified as CT-C70-F7-A9 according to EN13813, and finished with BETOPOX® 92 epoxy coating, classified as SR-AR1-B1.5-IR4, according to EN13813, is used for the renovation.
BETOPOX® 92 is a solvent-free, pigmented epoxy paint, which is ideal for use in garage and car park flooring. It is also suitable for sealing anti-slip systems in industrial and decorative flooring.

Challenges and constraints

“Execution of very steep slopes.
“Achieve adequate planimetry.
“Pavement subject to heavy wear and tear.
“Non-slip surface that can withstand vehicular traffic.

Molins Solution

“Prepare the existing substrate by milling the existing pavement.
“Execution of a high-performance wearing course with FERRODUR® 600 E.
“Finish with anti-slip finish coating, using BETOPOX® 92.

Execution

“First of all, the substrate is prepared by milling the entire surface and then vacuuming it. In this way we eliminate all the weak parts and those in poor condition. We obtain a resistant, stable surface with adequate planimetry. The milling is carried out perpendicular to the slope of the ramp, facilitating the application of the mortar on such an important slope.

“Next, we use BETOPOX® PRIMER as a primer, which provides adequate adhesion of the screed layer to the milled concrete base slab. Due to the steep slope to be solved, it was decided to make small working areas where FERRODUR® 600 E could be applied, in an average thickness of 2.5 cm.

“3. Once the FERRODUR® 600 E screed has been applied, the FERRODUR® 600 E surface is sanded to eliminate imperfections, irregularities and joints between panels. The surface is thus left open-pored and textured. And leaving it ready for the application of the final anti-slip layer.

“4. Once the moisture content of the cementitious screed is less than 3%, BETOPOX® PRIMER, a low viscosity primer, is applied, which will act as a regulariser of the surface to be treated, filling the pores and leaving the surface uniform. In addition, due to the high final requirements, a first aggregate seeding is carried out.
a first sowing of aggregate, with a granulometry of 0.3-0.9 mm, on the BETOPOX® PRIMER primer, even when fresh. After 12-24 hours, the unbonded aggregate is swept, sanded and vacuumed.

“5. After removing the unbonded aggregate, apply a coat of BETOPOX® 92, make a second sowing of aggregate and again sweep, sand and vacuum the unbonded aggregate after 12-24 hours.

“6. Due to the high roughness generated by the two-layer aggregate seeding and the demanding conditions of the commissioning on this site, two final coats of BETOPOX® 92 are applied as a final finishing and sealing coat.

Technical note

As is well known, an adequate preparation of the substrate in pavement works is of vital importance in order to achieve the expected results. Treatments such as milling, diamond grinding or shot blasting are common techniques used in flooring in order to obtain an open-pored and rough surface. It should be noted that, despite the wide knowledge of these preparation techniques in the construction sector, it is still relatively common to find substrates that have not been prepared or have been insufficiently prepared.

However, adequate preparation is not enough; when faced with situations of high mechanical demands, the use of products that provide adequate performance for the intended use and guarantee the durability of the system must be considered.

The use of mortars with high mechanical resistance such as FERRODUR® 600 E, allows the execution of the most demanding pavements that we can face, such as taxiways, industrial pavements, joints in airport runways and bridges, among many others.
airport runways and bridges among many others. FERRODUR® 600 E meets the requirements of the EN 13813 standard, classified as CT-C70-F7-A9. In the case seen in this article, due to the steep slope of the ramp and the expected high demands due to the passage of vehicles, it was decided to use epoxy bonding bridge
BETOPOX® PRIMER, which guarantees a very high adhesion to the original substrate. For the same reason, the finishing with BETOPOX® 92, with the choice of double dusting of aggregate, allows us to achieve very high performance in terms of vehicle grip, allowing an adequate transmission of tension to the substrate without compromising adherence.