Effect of Injecting Epoxy Resin Adhesive into Cement Mortar on Tile Adhesion Performance
2. Materials and Methods
2.1. Materials and Mixture Proportions
2.2. Experimental Plan and Test Methodology
- Air curing: standard condition for 28 d (23 ± 2 °C, 50 ± 5% RH).
- Water curing: standard condition for 7 d and water curing for 21 d (20 ± 2 °C).
- Freeze–thawing: standard condition for 7 d, water curing for 21 d and 25 cycles of freeze–thawing (−15 ± 3 °C, 15 ± 3 °C for 2 h ± 20 min, respectively).
- Salt immersion: standard condition for 28 d, immersion in chlorinated water (chlorine content: 0.3~0.6 mg/L, pH value: 6.5~7.8) for 7 d, rinse with clean tap water, standard condition for 24 h.
3. Results and Discussion
3.1. Permeability of Epoxy Resin into Mortar
3.2. Mechanical Properties
3.3. Shrinkage Characteristics
3.4. Adhesive Strength of Tile with Epoxy Resin Injection Reinforcement
- As a result, in the case of using an epoxy resin adhesive within the scope of this study, the adhesive strength improved up to about two times compared to that of using the existing dry cement mortar under the air curing condition. However, it was confirmed that the adhesion strength decreased by up to about 30% compared to using dry cement mortar under water curing and freeze-thaw conditions. Meanwhile, in salt immersion and laitance conditions, it showed about four and two times higher adhesion strength than dry cement mortar, respectively.
- The workability and permeability of the epoxy resin adhesive were enhanced at a solvent mixing ratio of 0.5 wt%. It is believed that this epoxy adhesive not only penetrated the interfaces of the tiles, mortar, and concrete, but also the mortar itself, thus improving the mechanical adhesion between each interface. This characteristic is potentially effective in improving the adhesion performance of porcelain and polished tiles with small pores, which make it difficult for the mortar to penetrate and mechanically adhere to the tiles.
- In addition to the improved mechanical adhesion between the tiles and mortar, the epoxy resin reinforcement also minimized the deterioration of adhesion due to shear stress by reducing the moisture evaporation and drying shrinkage of the mortar, which consequently reduced the shrinkage of the tiles themselves. In particular, the epoxy resin was expected to improve the adhesion performance of the large-sized tiles that are currently in demand because these tiles experience greater shear stress from shrinkage.
- The vulnerability of epoxy to moisture was observed under water and freeze-thaw curing conditions. However, based on the evaluation of the adhesion performance after standard air curing and salt immersion, the adhesion performance should be maintained if a stable level of performance is achieved by adequate air curing prior to exposure to harsh environments. However, further investigation of the effect of long-term exposure to harsh environments on the durability is required.
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|Quartz sand 0.3–0.9 mm||20|
|Quartz sand 0.1–0.6 mm||60||40|
|Quartz sand 0.1–0.3 mm||30|
|Redispersible polymer powder||-||4|
|Evaluation Item||Adhesive Used 1||Tile Used|
|Viscosity of the epoxy resin adhesive||Epoxy resin adhesive |
(solvent: 0, 5, 10, 15 wt%)
|Setting time of the epoxy resin adhesive|
|Permeability of the epoxy resin adhesive|
|Flexural and compressive strength of the mortar||DM|
(solvent: 5 wt%)
|Shrinkage of the mortar and tile||Ceramic tile|
(water absorption ≤ 10%)
(water absorption ≤ 0.5%)
(water absorption ≤ 0.2%)
|Adhesive strength of the tile|
|ID.||Adhesive Strength Based on Curing Conditions, Salt Immersion and Laitance (N/mm2)|
|Air||Water||Freezing-Thawing||Salt Immersion||Laitance Removal|
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Lee, S.; Lee, S.; Kim, G.; Son, M.; Choe, G.; Lee, J.; Nam, J. Effect of Injecting Epoxy Resin Adhesive into Cement Mortar on Tile Adhesion Performance. Appl. Sci. 2020, 10, 8527. https://doi.org/10.3390/app10238527
Lee S, Lee S, Kim G, Son M, Choe G, Lee J, Nam J. Effect of Injecting Epoxy Resin Adhesive into Cement Mortar on Tile Adhesion Performance. Applied Sciences. 2020; 10(23):8527. https://doi.org/10.3390/app10238527Chicago/Turabian Style
Lee, Sangkyu, Sangyun Lee, Gyuyong Kim, Minjae Son, Gyeongcheol Choe, Jaehyun Lee, and Jeongsoo Nam. 2020. "Effect of Injecting Epoxy Resin Adhesive into Cement Mortar on Tile Adhesion Performance" Applied Sciences 10, no. 23: 8527. https://doi.org/10.3390/app10238527