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Place concrete floor brick house Cracks analysis, treatment and prevention


Short negative reinforcement, and in the building interior and exterior corners of the hard corner of T-intersections in the construction of negative reinforcement can easily be stepped on, resulting in reduced effective thickness of plate,[link widoczny dla zalogowanych], which also increased the generation of crack-r. NA me WHY the corners than the rrl T-shaped corner Hao Yan say nothing of crack? This is mainly because the outside edges of the plate edges are simply supported by design calculations, the negative reinforcement only in the structural requirements allocation,[link widoczny dla zalogowanych], and the bar is shorter; The T-site is calculated by a continuous design, the larger negative reinforcement, and the extended length of the larger. So then WHY this phenomenon caused cracks in the south than the north side of house much? This is mainly because the south side of house from direct sunlight by day and night temperature difference than the north side of big, so brick ring beam and the tomb exists within the concrete board temperature difference than the fire temperature should produce concrete plate with the superposition of the internal shrinkage stress the role of the results. (3) transverse cracks in the floor board of the ruin place because gluten is usually unreasonable long, only t. . . _ ��. . . . ��. , ��. _. A boundary set a shorter negative reinforcement. When pouring concrete in the construction, laying frame for the board, construction workers can easily trample tread on the steel, causing the upper partial protective layer 1 reinforced large. Reduce the effective thickness of the plate, causing the board I crack can also cause serious cracks penetrate the floor. Especially when the negative reinforcement unreasonable length settings, cracks will be f in carrying out the ends of negative reinforcement, and moisture in the body approximately parallel to the development of i in a straight line. (4) unrepresentative Crack l irregular surface when the leveling layer Slab thick, it's: bad crack resistance, easy to produce from the shrinkage cracks. Should such a crack if its separate existence of the problem is not j large, but if the cracks and the lower structural layers re-merge: superposition of harm to a large �� rI3 Cracks side. To j to meet the requirements of use, anti-I} = steel corrosion: corrosion. Reduce leakage, improve the durability of components,[link widoczny dla zalogowanych], building a board cracks must be processed. J shrinkage cracking of concrete is up to the inherent characteristics of different materials, in order to fully carry out crack resistance is impossible, so I was certain specification of the component is to allow the cracks, place {floor shall be guilty of this case, but limits maximum crack width of 0.3 �� lm. The following is based on crack width and through the floor, etc. I wear a different situation, the following several cracks; treatment. (1) Surface treatment method for crack width of less than 1 0.3I m, the blind child; fill. When the surface cracks a little while, the concrete surface cleaning a clean, dry wells, brushing the surface of epoxy resin when J t have more cracks, the surface with a wire brush to wash 1: Net and dry, apply 2 ~ 3frillI ring j epoxy cement for a water positive side the requirements of anti-leakage, l f the table Ya wash off the net _ dry. Paste 2 to 3 layers of epoxy resin glass fabric that is r. l (2) f scarf filling method for crack width of 0.3mm when the big patch treatment. First by mechanical or hand along the crack ��__: hewn f ... V 'shaped groove, and then steel brush and compressed air to remove dust �� concrete debris clean, dry and then filled with resin mortar. (3) pressure grouting depth or penetration with a dry floor of the crack treatment. Pressure delivery device with concrete slurry poured into the interior of the component after hardening grout cracks condensation from the Summer Day together, closed, and reinforcing the role and restore the role of functional components to improve durability. Strength of cement grouting and chemical grouting with grouting in two ways. Cement grouting for large crack width of crack repair _ Bu lIIXIll, pouring chemicals for crack width or other dry 0.3rr1In big deal when, with a dry chemical grouting material structural reinforcement for the epoxy resin and methyl major acrylate Yu par 4 measures porridge seam cracks of concrete structures inside the material due to initial imperfections, the general to l against the inevitable. But never count. To improve the construction side, it can reduce and refine cracks (1) design specifications and engineering requirements to meet the prerequisite as far as low-grade concrete floor slab thickness of not less than 100into should adopt the thin and dense reinforced steel and, in easy to produce cracks structural reinforcement part of strengthening measures, such as double levy placed radial corners reinforced parts - pipe threading through the entire floor layout should be avoided. (2) Shi: [parties did not count the drawer should be strictly in accordance with the construction specifications construction, should not cut corners, but not into the design requirements with Pouring the floor above. Because of the higher grade of concrete, the greater the shrinkage of concrete shelter with strict control over,[link widoczny dla zalogowanych], properly control the use of water-cement ratio and adding material to maximize the use of less mud in the sand, well graded select H. Husband as the maximum size of coarse aggregate limestone gravel. Take measures to ensure the reinforcement of the protective layer thickness; threading pipe should be arranged in the structure of the neutral axis position on the pouring of concrete facilities are forbidden to l: l officers to strengthen concrete reinforcing mesh stampede conservation, ensuring the conservation of the conditions and time to minimize the thickness of screed . I (2006 a _l1 a l1)
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