Mesh use fiberglass insulation system to prevent cracking

Mesh use fiberglass insulation system to prevent cracking, it played the role of stress scattered, and together with the floor surface mortar insulation system composed of protective surface layer, natural resistance temperature and humidity changes and accidents caused by the impact of the surface layer Cracking. Fiberglass Mesh performance, with the floor surface mortar compatibility, thermal insulation system is decided by the quality of the crack is an important factor.

?? First, the strength and alkali-off strength retention rate

Anti-off strength and strength retention rate alkali-resistant glass fiber Mesh is an important performance. Strength and resistance broken glass count or weight inseparable. At present, China's market for Exterior Insulation System fiberglass Mesh weight per square meter are generally about 130 g, and generally low intensity, the normal strength of broken only about 1,000 N/5cm. And the outer wall insulation technology and regulations more mature Europe or the United States, fiberglass grid layout of the strength of anti-off much higher than China's. German construction Technical Committee (DIBt) request for Exterior Insulation System fiberglass Mesh normal-fault ? 1750 N/5cm strength, alkali resistance ? 50 percent retention rate. Domestic products, such as to meet the requirements of fiberglass Mesh per square metre to the weight of more than 160 g.

Broken anti-raising strength is necessary. ? Especially in cement and cement high strength grade polymer cement mortar floor surface. ? These things on the glass Mesh also is not just the destruction of chemical corrosion, and calcium hydroxide, sulfur pressure on the crystallization of calcium aluminate corrosive effec At the same time the higher mineral water absorption materials on the glass Mesh also plays a negative impact. Experimental proof, immersed in distilled water, the strength of fiberglass Mesh will be the loss of about 30 percent.

China is still dedicated to the lack of Exterior Insulation System fiberglass grid layout of the standard, especially in alkali-resistant strength retention and alkali resistance test, or testing throughout the manufacturers used lye different, useful NaOH solution , 80 ? useful cement grout, but also useful NaOH, KOH, Ca (OH) 2 mixed the caustic. As the performance indicators on the development of products on the market to the performance, price, the affordability of the market, there are very big impact on the domestic research units must be the performance of fiberglass Mesh do reunification of the abuse investigations, with reference to foreign standards, develop standards suited to China's national conditions.

No cement pure polymers due to E-mortar floor surface corrosion, water absorption small, fiberglass Mesh can be a long time in which to play a normal function of the protective surface crack resistance of the long-term is undoubtedly the most safe.

?? Second, fiberglass Mesh and mortar floor surface is closely related to

Rally in the bear deformation, clean glass surface mortar must be coordinated Mesh play a role, the two materials must have a good correlation with the relevance of the floor surface mortar bad Mesh, cracks or high intensity again will be produced in the early days.

In the protective surface began to bear rally, Mesh should be able to force the state as soon as possible in order to play its tensile properties, and stress dispersed. Although Mesh not be able to stop the mortar floor surface tension reached a certain strain and it is the first of the cracks, but it can effectively delay the launching of the first cracks of the time, and restrictions of the first cracks in width, and through its distribution node to Jingwei stress, the entire floor surface of the slurry uniform thereby making cracks uniform.

Europe and the United States in general, following 0.2 mm in width of the cracks sound cracks. External wall insulation system, it was more important not to prevent the occurrence of cracks (as reinforced concrete can not stop the crack, clean surface mortar eventually cracking cracking depends on its contingency), but as far as possible delay deformation and thus delayed cracking, At the same time limit the width of a single crack.

To this end, and the relevance of the floor surface mortar good Mesh?????performance:

1. 1. Higher intensity of the node

If Mesh nodes occurred when tension slip, in the early stress on the force by more than under mortar and the floor surface cracks.

Node strength test method is: Zonal Jianqu along the 330 mm × 50mm (zonal woven silk must be odd) of the test from the end of the first trial about the cut of 150 mm on both sides of the silk weaving all (to shear in the central node) , leaving only an intermediate zonal woven silk in the 50 mm (or between six nodes), cut the middle of Haulien zonal woven silk. ? Examination of the plane to do in the Rally Rally test, a test machine surrounds the central Haulien zonal woven silk, the other cradling all woven silk, woven silk read out of the force (N). Exterior Insulation System general requirements fiberglass Mesh nodes intensity = 3.0 N / single wire.

2. 2. Lower tensile strain

If Mesh tension at the node does not slip, and stretching strain larger, it will also cause the floor of mortar cracking occurred in the early days.

Mesh glass fiber tensile strain including the Rafah early strain and the fracture strain. Available in the elongation rate of 0.25%, 0.5%, 1.0%, the Rally, as well as the fracture Rally (off-intensity), the fracture strain said.

3. 3. Small deflection of silk weaving

Mesh weaving in silk weaving, it is inevitable that deviation to happen. If deviated from too much, resulting in the force eccentric, the same effect on the results. Generally speaking, 1 m in length, silk weaving deflection not more than three woven silk.

To sum up, to meet the requirements of the above-mentioned three fiberglass Mesh, the Rally - strain curve should be a linear relationship, as the following diagram.
Figure in a nonlinear relationship between Mesh Rally T in the same role under tensile strain than a linear relationship between Mesh. ! In the scope of this deformation (??, and its common role of the clearing-mortar may have been cracking!

From the matching performance of speaking, clearing the flexibility of slurry (cracking strain) should be higher the better, Mesh the opposite. According to testing, some domestic manufacturers Mesh the fracture strain at approximately 5 percent, and cement-based mortar floor surface cracking strain is only 0.4% -0.5%.

No pure polymers cement mortar floor surface cracking contingency higher, such as in Europe Shen Exterior Insulation System of flexible fiber reinforced plastic plastering up 2.38%, and 3.5% below the fracture strain of fiberglass mesh cloth portfolio, its anti-cracking performance of Merit is obvious.

To bring into full play the fiberglass Mesh tensile properties, attention should be paid to construction Mesh location should be in the protective layer thickness on the lateral surface of the 1 / 3. Exterior Insulation system construction, the surface of the floor surface mortar to see the glass Mesh lattice and glass Mesh do not see the color (protective layer thickness of 2-3 mm, the glass thickness 0.65 mm Mesh ) is quite good.