Why does the concrete turn the sand. What to do with 5

Sand on the surface of concrete usually occurs in large-area engineering construction such as ground and floor slabs!!

The factors that cause this are:

1. The raw material sand is too fine, the mud content is too high, and the fly ash is too coarse;

2. Mix ratio design The sand rate is too large, and the fly ash output is too high;

3. Production During production, the concrete collapse is too large, and the water consumption exceeds the standard;

4. Construction: During construction, the powder (especially fly ash) floats due to excessive vibration, and a slurry layer is formed on the surface of the concrete; At the same time, over-vibration is also easy to cause the occurrence of aggravated concrete surface water leakage, so that the surface water-cement ratio is too large, when the slurry layer and water leakage are not treated in time, it will cause the concrete surface strength to be reduced, thus producing the phenomenon of sand (note: watering and curing when the concrete has not yet been set will also cause a similar phenomenon).

The solution is nothing more than to strictly control the quality of raw materials, reduce the sand rate and reduce the amount of fly ash as much as possible (we now do not mix fly ash on the dump ground), control the collapse of concrete, and communicate with the construction site in a timely manner to avoid the negative impact caused by construction!!

Concrete, right? If you use commercial concrete, the sand part of the road is sanded, and the fly ash parameter can not be more. The only way to solve this problem is to sprinkle a layer of cement on the surface after the construction is completed.

After hardening, only a layer of glossy mortar can be applied.

1. First clean up the damaged cement pavement The concrete pavement base layer is cleaned up, and the loose stones, sand and fallen objects are removed, revealing a solid surface layer for later use. 2. Wash the road surface with a high-pressure water gun to prevent sewage from backflowing, and try to flush in one direction. 3. The clear water on the road surface washed by the road breeze, and the road surface should be kept moist without clean water.

4. Open the outer packaging bag of cement pavement concrete pavement repair materials, prepare a mixer or mixing drum, and hold a mixing drill and clean water. Put a certain proportion of clean water lead in the mixing barrel, pour in the dry powder BT water core mud pavement repair material and concrete pavement repair material, and fully stir evenly for later use. 5. Prepare the mixed BT cement pavement repair material BT concrete pavement repair material on the pavement to be repaired and compact it with a manual trowel.

6. The repaired cement pavement should be maintained in time, and it can be sprinkled and cured once within 24 hours. After the maintenance water is completely dry, Huai Shiheng can be opened to traffic.

1. First look at whether the water-cement ratio of concrete is appropriate, the water-cement ratio is too large, which is easy to segregation and water leakage, resulting in sanding of the surface layer;

2. Secondly, see whether there is excessive vibration during construction, which is very prone to serious segregation and water leakage;

3. If it is the ground, it also depends on whether the surface is plastered and calendered in time;

4. Fourth, to see whether it is maintained in time, the necessary maintenance should be carried out to prevent the water-cement ratio of the concrete surface from being too large or the water is lost before the surface strength is not established, the water dispersion of the concrete surface layer is too fast, and the surface cement can not be fully hydrated, which will also lead to low surface concrete strength and loose structure.

Generally, there are three treatment methods, first, if it is only a slight sand turning, it can be rolled two or three times more than the waterproof primer for cement foundation. Because the waterproof primer can not only isolate the water vapor and hold the mold, but also relatively improve the strength of the cement foundation.

Second, there is a "cement foundation sealing curing agent" on the market, which can very effectively improve the strength of cement foundation, but the cost is relatively high, and the treated foundation and polyamide surface layer are incompatible (i.e., poor bonding), and it is easy to have the problem of separation between the plastic surface layer and the cement foundation.

Thirdly, "Guangzhou Tysen Health Equipment" specializes in the development of a "reinforced putty" cement foundation repair material for cement foundation sand turning, unevenness and other problems, which has obvious effects and high cost performance, which can not only improve the strength of cement to C25 or above, but also repair the problem of water accumulation caused by uneven noisy sites. (4000 electricity, 879 words, 118) or (139 hands, 2501 machines, 4568) Manager Cai.

You should find some companies to explain to you in detail, of course, if there are some experienced workers, they can also meet your needs.

Summary. Concrete sanding and sand turning are two different phenomena, I will simplify your question. Concrete sanding refers to the fact that when mixing concrete, some aggregates with larger particles or lower density will detach from the surface of the concrete or fall below, resulting in sand or potholes on the surface, affecting the quality of the concrete.

Sand turning refers to the appearance of a sand-like substance on the surface of concrete during construction, which may be caused by improper vibration or pouring machinery during construction. Hope this meets your requirements.

Concrete sand and sand turning are two different phenomena, and I will answer your question in a simple return to the slag. Concrete sanding refers to the fact that when mixing concrete, some aggregate stove beams with larger particles or lower density will detach from the concrete surface or fall below, resulting in sand or potholes on the surface, affecting the quality of concrete. The concealed sand turning refers to the appearance of a layer of sand-like substance on the surface of the concrete during the construction process, which may be caused by improper vibration or pouring machinery during construction.

Hope this meets your requirements.

You've done a great job! Can you elaborate on that?

Concrete sand sand and sand turning are two different phenomena. Concrete sanding refers to the fact that when mixing concrete, the aggregate detaches from the surface or falls below, resulting in sand or potholes on the surface, which affects the quality. Sand turning refers to the appearance of sand-like substances on the surface during the construction process, which may be caused by vibration or improper pouring machinery.

I hope it doesn't meet your requirements.

Generally after three years.

Ordinary cement mixed concrete floor is generally used for 3 years, under the action of forklifts, the ground will have different degrees of sand, dust, with the growth of service life, plus carbonization, water erosion and weathering, the surface of the floor will continue. When there is a phenomenon of sand and ash on the ground, the general method on the construction site is to smear a layer of plain ash on it to cover the sand floor.

Sand turning solution

First of all, remove the dust, debris, stones and other residues on the surface, clean the rotary base surface, then select the cement floor sanding treatment agent and ground solid material at the first point, and mix the treatment agent evenly according to the proportion on the manual, and then use a brush or roller front file to dip an appropriate amount of mixture on the ground that needs to be turned sand for brushing, which must be evenly applied to the surface.

Finally, after drying, you can water and cure. Note that watering and maintenance must be carried out according to the weather temperature. Ground sand turning treatment method. Remove dust, debris, meganuclear stones and other residues from sanding on the surface, and clean the construction base surface.

Choose the most advanced cement floor sand treatment agent and ground solid material, mix the treatment agent evenly according to the proportion on the manual, and use a brush or roller to dip the appropriate amount of mixture on the ground that needs to be turned over the sand to paint, which must be evenly smeared on the surface, and then watered and cured after drying.

1. The sanding of the cement floor is not too serious, and when the sand is raised in a small area in a local area, a large terrazzo machine can be used to polish the sanding part to expose the hard surface of the cement floor, so as to reduce the sand and ash of the cement floor.

2. When the cement floor is sanded in a large area, VL-M2 cement floor sanding treatment agent can be used for surface hardening, the product is a polysilicon water-based inorganic composite liquid material with a unique formula, composed of two components (A and B), it can effectively penetrate the surface layer of concrete 3-30mm, and a series of complex chemical reactions occur with the free salts in the concrete to form a three-dimensional network dense whole, so as to greatly improve the surface strength of the concrete, and achieve complete sand-free. The effect of no ash, and long-lasting, the service life is almost the same as that of the original base concrete. The construction of VL-M2 cement floor sanding treatment agent is very simple, no special tools are required, only buckets, water scoops, brooms, mops are needed, and of course there are watering cans. Sprinkle the material on the ground, sweep (mop) evenly with a broom or mop, and keep it moist for a few hours.

The detailed VL-M2 cement floor sanding treatment agent construction process will be given to you with the material, as long as you follow the process, it is no problem to solve the cement floor sanding.

3. For the cement floor with serious sand as a whole, it should be renovated, the surface layer should be removed, the floating sand should be removed, and rinsed with clean water. Before laying the surface layer, the surface of the chisel should be kept moist, and a water-cement ratio of plain cement slurry should be brushed to enhance the cohesion, and then a layer layer should be laid with 1:2 cement mortar, and the calendering and maintenance should be done carefully to reduce the risk of sanding on the surface of the cement floor.

The risk of sand on the surface of the cement floor.

Oujin floor penetrant can be used.