In the same construction environment, using the same construction process, the different conditions of the base concrete (including fine stone concrete) will have a corresponding impact on the construction quality (including color, strength and wear resistance) of the cement wear floor. Therefore, when constructing Sika hardener products, we propose the following recommendations for the base concrete:
First, control the bleeding of concrete
After the concrete is vibrated, the bleeding rate should be controlled within 2%. There are three disadvantages in the production of water from concrete:
1. The surface strength is low and the wear resistance is low;
2. The admixture in the concrete (especially fly ash) easily floats to the surface, seriously affecting the apparent effect.
3. The admixture in the concrete tends to float to the surface, which may form a barrier layer, which may affect the bonding of the hardener to the concrete and partially cause shelling.
Second, control the amount of fly ash
The use of high-quality water reducer can avoid the use of fly ash, or control the amount of fly ash to within 5%. When the concrete appears to be bleeding, the fly ash is very likely to cause local "black spots" on the surface of the wear-resistant floor.
Third, avoid mixing mineral powder
Mineral powder should be avoided in concrete. Mineral powder will increase the risk of shelling on the wear-resistant floor.
Fourth, control slump
In order to ensure the quality of the wear-resistant floor, the slump should be small and not large. The mixing station should be based on the temperature and transportation distance, and the slump of concrete should be controlled within 100mm. If there is concrete pumping requirements, the slump should be controlled at 120mm ± 10mm. After the concrete reaches the site, it is strictly forbidden to add additional water.
5. No air entraining agent should be used.
When the air entraining agent is used in the concrete, the wear-resistant floor will inevitably bubbling and shelling. Therefore, the use of air entraining agents should be prohibited.
6. Avoid using early strong antifreeze
At present, most of the early-type antifreezes are sodium sulfate products, and the surface of the cement will be white after hardening (one of the so-called "pan-alkali" conditions). If it is sensitive to color, especially colored ground (such as green), it should be avoided.
Seven, water requirements
Drinking water should be used for mixing water, and should comply with the current "Concrete Mixing Water Standards" (JGJ63). When using other water sources (such as ground water, river water), there may be wear-resistant ground hair.
Eight, control intensity
The concrete grade should not be lower than C25 and should not be higher than C30.
9. Control the aggregate content of aggregates
It should be avoided that the aggregate of the concrete to be mixed contains sediment. Otherwise, the wear-resistant floor may be bubbling or shelling.
Ten, other
When the hardener is used on the fine stone concrete infusion layer, in addition to the above recommendations, there are two points to note:
1. The thickness of the entire cast layer should be ≥ 60mm.
2. It is advisable to use the interface agent (such as Sikadur 32 LP) when pouring the whole cast layer.
3. It is necessary to point out that the color of the wear-resistant floor will be affected by the concrete of the base layer. If the color requirements are high, it is recommended to make a larger test panel on site to understand the final color.
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