What to do if the lime on the surface of the concrete aerated block bursts

1) Surface cracks and bursts.

Crack refers to the appearance of fine cracks on the surface of the green body when it is stationary, mainly due to the large temperature difference between the upper and lower parts of the body, and the expansion and cracking of the surface due to the rise of internal temperature and increased pressure, which can be found from the following factors: a Check the lime quality, too much powder ash or over-burned ash. b Room temperature is too low.

c The amount of lime is small. d The temperature of the green body is low in the later stage. e Indoor air flow is large.

Bursting refers to the surface cracking caused by the reaction of a small amount of quicklime and water in the body when the steam is high in the process of high-pressure heating in the kettle.

2) Stir unevenly, white spots appear.

Generally, the mixing effect is not good, the slurry is too thick, the lime is fast lime, or the fineness of the lime is too large or too small when grinding. The solution is as follows: a Increase the mixing intensity, such as increasing the speed of the mixer.

b Extend the stirring time appropriately. c Adopt fractional feeding. d Control lime fineness.

e Increase the water-to-material ratio appropriately. f Pouring low bulk weight products. g Change the lime variety where possible.

Summary. The peeling off of the stucco layer may be caused by water seepage, freezing of the paint before it dries, cracks in the insulation layer, etc. You can remove the detached part, re-scrape the putty, apply primer, and brush again. If it is the junction of different materials, it is also necessary to do a good job of anti-crack treatment.

Hello. There may be many reasons for the cracking of lime masonry, such as the ash drying too fast, uneven ash and ash when scraping, the putty of the base shirt is too thick, and the anti-crack treatment is not done. The treatment method is generally to knock off the wall skin along the cracked sides and do a new plaster52.

If the cracked part or the combustion site is at the junction of different materials, it is also necessary to hang the net.

The bricks were hung two centimeters.

The stucco layers are all peeling off.

The peeling off of the stucco layer may be caused by water seepage, the paint is not dry, the front is only frozen, and the insulation layer has cracks. You can remove the detached part, re-scrape the putty, apply primer, and brush again. If it is the junction of different materials, the puncher should also do a good job of anti-crack treatment.

It's not the paint that comes off, it's the mortar that comes off.

Mortar shedding may be caused by improper treatment of the base layer, inaccurate mortar mixing, and too high or low temperature during construction. You can clean up the parts that have fallen off, reapply the mortar, and add some trembling 107 glue to strengthen the adhesion. If the tile falls off, scrape the mortar behind the tile and paste it back to Yu Xi.

Add 107 glue to paint, and then hang the general barbed wire and then paint is not useful.

Yes, there is.

If the cement quality is unqualified, we need to knock off the floor slab and re-pour. If the floor slab is cracked due to construction and other reasons, we need to clean the cracks first, then pour epoxy resin liquid into the cracks, and then repair and seal the mouth of the irrigation river with plugging spirit.

In the absence of structural columns, there may be a risk of cracking after the aerated concrete block has been plastered on both sides. This is because the plastered masonry will increase the overall stiffness and expansion coefficient, but because there are no tensile members such as structural columns to connect the upper and lower parts of the block together, it may lead to inconsistent deformation of the upper and lower parts of the block, resulting in cracking.

In order to avoid this situation, it is suggested that when plastering on both sides of the aerated concrete block, structural columns or tensile members should be set in the wall to strengthen the overall stiffness and stability of the wall. At the same time, the following points should be paid attention to during the construction of the rolling hall:

1.The block should be used in a dry and waterless condition to prevent the block from absorbing water and expanding inside the wall and causing cracking.

2.The blocks should be regular and consistent in size, and special aerated concrete block binders need to be used at the joints to ensure the tightness and stability of the blocks.

3.The plastering material should be a material with a low elastic laughing modulus, such as putty with good expansion.

Paying attention to the above points in the construction process can effectively reduce the risk of cracking of aerated concrete blocks and improve the structural stability and service life of the wall.

And the solution aerated concrete exterior wall surface to solve the technical problem of aerated concrete exterior wall plastering layer cavitation, in addition to the selection of special masonry mortar for construction, the most important thing is to choose the special plastering mortar suitable for the aerated concrete material for construction, the strength, thermal conductivity, elastic modulus, linear expansion coefficient, linear shrinkage coefficient and other properties of this plastering mortar should be adapted to the aerated concrete, but also to have strong water retention and water absorption, workability, good affinity. Practice has proved that in order to prevent cracking, the deformation capacity of the selected plastering mortar should be greater than the deformation capacity of aerated concrete, and its flexibility is better than that of aerated concrete, and the strength is not much different from aerated concrete; At the same time, the deformation ability and flexibility of the anti-crack layer material and the finishing layer material outside the plastering layer should also be strengthened layer by layer, and gradually changed layer by layer. That is to say, the whole plastering material system adopts the flexible gradual change technology of allowable deformation and induced deformation, so that the flexible deformation of each structural layer is higher than the deformation of the inner layer, and the elastic modulus change index matches each other and gradually changes layer by layer, which meets the principle of unification of allowable deformation and limited deformation, and can disperse and dissipate temperature stress at any time.

The simple process flow of aerated concrete exterior wall plastering is as follows: 1. Base treatment: brush off the fish scale loose powder particles of aerated concrete wall with a wire brush, wipe it with cotton silk, and then water it to fully moisten.

2. Painting interface mortar: use a special spray gun to evenly spray the ZL sandblasting interface agent onto the wall, with a thickness of 2 3mm. The function of interface treatment is not to make the aerated concrete absorb too much water in the plastering mortar, so as to avoid the mortar losing water before it is fully hydrated and forming hollow cracking.

At the same time, it can also enhance the adhesion between the plaster layer and the aerated concrete wall. 3. Use plastering materials to hang vertically, horizontally through the line, and paste ash cakes. 4. Plastering:

Because when carrying out external wall external insulation, only aerated concrete materials are used for thermal insulation, it is difficult for local places such as beams and columns to meet the requirements of thermal insulation, therefore, supplementary thermal insulation should also be made. The selection of ZL rubber powder polystyrene particle insulation slurry as aerated concrete exterior wall plastering material can not only achieve the effect of supplementing thermal insulation, but also meet the requirements of aerated concrete exterior wall plastering. At the same time, the powder of the material is composed of a variety of fiber composite inorganic powders and polymer organic bonding materials with different proportions, different elastic modulus, and length matching, which has good construction performance and crack resistance.

The plastering thickness is about 20mm. The frame, special-shaped columns, etc. are in different proportions with the properties of aerated concrete materials, and they are all uniformly plastered and leveled with ZL rubber powder polystyrene particle insulation slurry.