What is the difference between gypsum-based self-leveling mortar and fine stone concrete used for floor leveling?
As a floor leveling layer, gypsum-based self-leveling mortar has advantages that other materials cannot match. It is an important product that replaces fine stone concrete and reduces carbon emissions, and has social and economic benefits of energy conservation and emission reduction.
1. Product quality
Self-leveling mortar: The formula of dry-mixed mortar produced in the factory is scientifically measured and accurately mixed, and the mixing is uniform.
Fine stone concrete: The raw materials are mixed on site, and the measurement ratio is difficult to guarantee.
2. Construction
Self-leveling mortar: Dry-mixed mortar (bags/bulk) is easy to stack on site, which is conducive to civilized construction. On site, it is only necessary to stir and discharge evenly according to the corresponding amount of water or directly use mechanical mixing for construction. The mortar has good fluidity and can be evenly distributed and flow into the gaps between floor heating pipes by its own fluidity.
Fine stone concrete: Stacking cement and sand and gravel on site is prone to dust pollution and other dirty phenomena. It is difficult to ensure uniform mixing of cement and sand and gravel, and the fluidity is poor. The construction personnel are responsible for spreading the mortar evenly into the gaps between floor heating pipes.
3. Construction speed
Self-leveling mortar: Mechanical construction can greatly improve the progress of the project. Under normal circumstances, mechanical construction can reach 50-80㎡/h. The thickness of one construction can be 4-60㎜. Due to its low internal stress, even a larger thickness will not produce cracks.
Fine stone concrete: Due to on-site mixing, the construction speed is slow. If the thickness of the mortar is too large, it is easy to form cracks on the surface if it is not well maintained.
4. Density and heating effect
Self-leveling mortar: Since self-leveling mortar has good anti-segregation ability, the hardened mortar is evenly distributed and has a dense mortar structure. This dense mortar structure is conducive to uniform upward conduction of heat, thereby ensuring the maximum thermal effect. In addition, self-leveling mortar has a good grip on hot water pipes, and is particularly suitable for use with PB pipes with good high temperature resistance.
Fine stone concrete: Due to improper construction, segregation is easy to occur, coarse aggregate is easily distributed in the bottom layer, and fine aggregate and powder are distributed in the upper layer. Since the aggregate particle matching is not optimized, the mortar contains more pores, which is not conducive to heat conduction and easily causes heat loss. Due to the addition of some coarse aggregates, some sharp corners may squeeze or even damage the hot water pipes.
5. Surface quality
Self-leveling mortar: Due to the advantages of self-leveling, the surface is flat and smooth.
Fine stone concrete: The uniformity and surface flatness of the mortar layer are difficult to guarantee
6. Early strength
Self-leveling mortar: High early strength, usually 1-2 days can be used, the corresponding flexural strength can reach 5-10N/㎡, and the compressive strength can reach 15-30N/㎡.
Fine stone concrete: low early strength.
With the promotion of residential finished products, building floor heating backfill, ground elevation application is huge. Gypsum-based self-leveling mortar can achieve two-in-one elevation and leveling. Subsequent construction can directly carry out thin floor tiles, wooden floor assembly, and elastic floor paving. This not only greatly shortens the construction period, but also has good leveling effect and low overall cost. It is the only choice for ground raising and leveling in the construction industry.
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