Have you discovered a phenomenon that many houses will have sand on the ground after the renovations, cracks on the ground, and pitting phenomenon. This causes the ground to look very unsightly. What are the causes of sanding on the ground ? What are the ground sanding methods? The following small series will introduce you to the floor sanding method.
Ground Causes
1. The ratio of water to cement is too large: that is, the amount of concrete water mixed is large, leading to bleeding on the surface of the concrete and reducing the surface strength of the concrete.
2. Gravel grading is unreasonable and the clay content is high: Unreasonable aggregate gradation, too fine earth sand can easily cause sanding on the ground, affecting the early hydration of cement and the condensation of concrete.
3. Excessive vibration in the construction process: Exacerbate bleeding on the concrete surface, resulting in low strength of the concrete surface.
4. Improper maintenance: Failure to timely maintain or maintain adequately, exposure to high winds or large winds causes a large amount of water loss on the concrete surface, and the surface is not fully hydrated, resulting in low strength.
5. Other reasons: The calendering time is not good, the surface of the concrete does not reach a certain level of strength, and the surface of the concrete is frozen at low temperatures.
The interface agent is often used to stir cement on the construction site and it is hoped that the sand will be covered. In fact, this will not achieve the desired effect. In general, the surface layer will crack, peel off, and cause large areas to form shells. This is due to the fact that the grass roots have not been treated well, and the grass roots are flourishing, and it is totally wrong to think of the effect of repair through coverage.
[ground sanding solution]
Concrete pavement repair material can solve the problem of sanding on the cement floor. Its main principle is: the end product of the complex chemical reaction will block, seal the structural pores of the concrete, increase the strength of the surface hardness, improve the impermeability caused by the improvement of the density. Reducing the path of moisture flow, that is, reducing the intrusion of harmful substances, greatly enhances the ability of concrete to resist chemical attack. Therefore, the concrete surface curing agent can bring about a long-term seal, strong, wear-resistant, dust-free concrete surface.
The compounds that penetrate the concrete and the semi-hydrated cement contained in the concrete that has been coagulated, free calcium, silicon oxide and other substances undergo a series of complex chemical reactions to produce hard substances that eventually make the concrete surface dense Improve the degree of concrete surface to improve the strength, hardness, wear resistance, impermeability and other indicators. .
[How to prevent the ground from sanding]
Strict control of water-cement ratio: The ratio of water to cement directly affects the mortar strength. Water-cement ratio is too large, the ground strength is low, the surface is rough, not wear-resistant, easy to sand; excess free water evaporates, resulting in the appearance of capillary holes in the cement slurry layer, reducing the density of the mortar, easy to wear sand.
l Use ordinary portland cement as much as possible (strength level not less than 42.5 MPa)
Compared with slag cement and pozzolanic cement, ordinary portland cement has the advantages of better water retention, less shrinkage, and high early strength, which is very favorable for ensuring the quality of the ground and the construction schedule.
The use of ordinary Portland cement is an essential prerequisite for ensuring the strength of cement mortar and preventing sand from building ground.
Prohibited to use expired cement and damp cement
Cement storage period of more than three months is called expired cement. When the expired cement is used in the ground surface, its strength, hardness and wear resistance will be significantly reduced, resulting in sanding. The moisture-contaminated cement is cement and water that condense into pieces, so that the activity is greatly reduced and the cementation performance is poor. Compared with the expired cement, the quality is worse, so it cannot be used on the ground surface layer.
Summary: Flooring sand treatment Xiaobian will introduce to you here and hope to help everyone.
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