I think at that time, many people had muddy grounds in their houses and it was easy to get ash. It was even more "disastrous" on rainy days, and it completely turned into a "cement land." Later, with the improvement of living conditions, people are playing cement on the floor of the house, bringing great convenience to life. However, the cement floor often encounters sanding. Why is this? Is it the use of poor quality cement? In fact, there are many reasons for sanding on the concrete floor. Finding the right causes the problem to be solved better.
First, cement floor sand Why is this?
Causes of sanding on the concrete floor Many people will feel that it is caused by insufficient cement. It is not only so. The reasons for the sanding of concrete floors are almost the following:
1, the water-cement ratio is too large: that is, the amount of concrete water mixing, resulting in concrete surface bleeding, reduce the concrete surface strength.
2. Gravel grading is unreasonable and the clay content is high: the gradation of aggregate is unreasonable, too fine earth sand can easily cause sanding on the ground, affecting the early hydration of cement and the concrete condensation.
3. Excessive vibration in the construction process: Exacerbate bleeding on the concrete surface, resulting in lower strength of the concrete surface.
4. Improper maintenance: Failure to timely maintain or maintain adequately. Exposure or gale causes a large amount of water loss on the surface of the concrete. The surface is not fully hydrated, resulting in low strength.
5, other reasons: the calendering time is not good, the concrete surface does not reach a certain intensity on the homework, the construction of the concrete surface under low temperature freeze.
Second, how to solve the cement floor sanding?
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.
Material Usage: In two steps, first use No. 1 material for hardening treatment, and then use No. 2 material for abrasion treatment.
1, the basic requirements
For the cleaning of the sand floor, no dust, keep it dry (may allow moisture, but there should be no clear water);
After cracking and defect application engineers grouting series and A3 high-strength repair materials are repaired, they are uniformly hardened with A5 concrete hardener.
2, hardening treatment
Directly spray 1# material to ensure that the grassroots fully infiltrate and absorb, absorb the 1# material at any time, maintain the infiltration state, and completely soak the entire ground;
At any time, remove the excess 1# material from the low-lying area to the place where it has been absorbed, and ensure that the primary layer fully absorbs No. 1 material within 2 hours, and there should be no excess material piled up; The ground with severe sanding can be sprayed 1# continuously for 3 consecutive days.
3, wear-resistant treatment
1 # material construction at least 48 hours after the use of 2 # material directly brushed on the hardened ground, once you can, should be evenly full, no maintenance, 7 days after normal use.
In the second point mentioned above, there are actually two methods to deal with the special cement floor treatment. One is to ask the professionals to solve the sanding problem on the cement floor, and the other method is to use the cement floor. Sand treatment agent, this can be considered a construction glue. However, it is worth mentioning that this treatment agent is divided into many types. Everyone must choose for their own home when they are purchasing.
Third, the cement floor should also pay attention to conservation
1, maintenance methods
For mechanically paved concrete floors, a curing agent can be applied first and then moisturized. It is best not to use water conservation.
2, plastic film
The film thickness should be moderate and the width should be greater than 600mm coverage. When the two films are docked, the overlap width should not be less than 400mm, and the film should always be fully covered during maintenance.
3, cover maintenance
Moisturizing membranes, geotextiles, geotextiles, sacks, straw bags, straw curtains, etc. shall be used to moisturize and timely water, keeping the concrete surface in a state of moisture all the time. In areas where the temperature difference between day and night is more than 10 degrees or the average daily temperature is not more than 5 degrees, the construction ground shall adopt measures for conservation of heat and moisture.
4, curing time
According to the growth of concrete ground compressive strength, it should not be less than 80% of the designed compressive strength. Special attention should be paid to the first 7 days of moisturizing and heat preservation. The average number of days for conservation should be 14-21 days, the high temperature weather should not be less than 14 days, and the low humidity weather should not be less than 21 days.
There is actually a way to sand the concrete floor. We can sprinkle water on the ground in the original sand water and clean it. Then we put a layer of good quality cement on the ground in the original water. This is very Save time and effort. However, it is recommended that you help yourself when you help but you should not be too thin.
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