Thick-layer, crack-resistant self-leveling backfilling process for underfloor heating
Release Time:
2016-03-16
Source:
Thick-layer, crack-resistant self-leveling backfilling process for underfloor heating
The thick-layer, crack-resistant self-leveling backfill process for underfloor heating can revolutionize traditional installation methods. With a single pour of self-leveling mortar, the floor surface becomes smooth and even, allowing direct installation of the finishing flooring material, with a thickness of 20–50 mm. Thick-layer self-leveling cement The mortar layer can simultaneously address two major challenges in construction: cracking of the floor surface and insufficient floor flatness. This innovation significantly reduces the loads borne by the structural system, allowing for smaller cross-sectional dimensions of beams, columns, and foundations. Moreover, it enables an increase in the usable ceiling height without altering the storey height, or a reduction in storey height while maintaining the same interior clear height, thereby achieving substantial savings in building materials and lowering overall construction costs. On the other hand, when these older buildings are demolished, the volume of construction waste is also reduced. Undoubtedly, these characteristics exert positive impacts on the construction, operation, and demolition phases of buildings, delivering clear economic, social, and environmental benefits.
Ground cracking is primarily determined by the temperature difference and overall temperature of the floor. In conventional underfloor heating systems, the supply water is typically set at 60°C and the return water at 50°C, resulting in a significant temperature differential and substantial thermal expansion and contraction of the floor surface, which can easily lead to cracking and deformation. By contrast, when high-efficiency terminal units are added to the radiant heating surface, the supply water temperature can be substantially reduced, thereby narrowing the temperature differential. Under these conditions, the floor temperature closely resembles the heating pattern experienced during summer, when the floor does not crack or undergo excessive thermal expansion and contraction. Consequently, high-efficiency underfloor heating terminals allow for a significant reduction in the thickness of the screed layer, while still achieving rapid heat-up, effective heat storage, and energy savings.
Advantages of the thick-layer, crack-resistant, self-leveling underfloor heating backfilling process:
1. The product is flowable and can be placed using manual or mechanical pumping.
2. With a construction thickness of 30 mm or more and no cracking, this is an exceptionally high-quality underfloor heating backfill mortar.
3. The compressive strength of the material shall be not less than C20.
4. The flatness shall meet the requirement of a deviation of no more than 2 mm when measured with a 3-meter straightedge.
5. No traditional curing is required; other interior finishing work can be carried out 24 hours after construction.
(After 2 hours of summer construction or 6 hours of winter construction, the Shore hardness reaches 60, allowing personnel to walk on the surface.)
6. After construction, there is no need to install the floor finish or the leveling layer; other flooring materials can be directly laid on the surface, thereby shortening the construction schedule and reducing labor costs.
