Concrete Pavement common quality defects and prevention measures
Standard, to meet the appropriate standards, to pay attention to the concrete at the corners of the vibrating, vibrating faster when inserted into the time, taking time to slow, too fast and left out to avoid the gap, affecting the density of concrete, thereby affecting concrete strength. In the corner at the addition of steel mesh, face weak roadbed section, but also additional steel mesh, made of reinforced concrete pavement to prevent cracks. 1.3 hair-like cracks in the shallow surface, such as small surface cracks. Shallow surface cracks mainly health hairy enough, due to contraction of the surface dry. The impact of surface durability and wear resistance, surface appearance of the severe impact on quality. Control measures: survival in the concrete slab after the time according to specification (final setting) covering health, and health must always be kept moist during the period, not to exposure and drying, the general health of time not less than 14 days. 2. Damaged expansion joints, arch expansion, dislocation, loss of filling material a number of roads in use for some time, the expansion joints on both sides of the plate surface cracks, damage, serious two adjacent panels will be the wrong station and arch, expansion cracks in the filling material is extruded off. These phenomena are mainly due to the following reasons caused by: expansion joints board long enough to make a concrete link between two adjacent panels, or expansion joints filler off,
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Salvatore Ferragamo outlet, hard stones and other debris out of people, when the thermal expansion of concrete panels produce upper concentrate stress, concrete compressive strength than squeeze occurs when broken, destructive phenomenon. Expansion joints spaced too long, because year after year, thermal expansion and contraction, so that within the joints of people out of sand, stone and other objects, resulting in joints is gradually increasing. When the thermal expansion of concrete panels produced by primary and concrete compressive stress is greater than the friction between the plates (but not over when the compressive strength of concrete), gave rise to the phenomenon of the two adjacent arched plate. Expansion joints and the lower part of the upper plate seamless parts of the seams are misaligned, or not set the vertical expansion joints, the force transmission lever position is not placed correctly, expansion joints on both sides of the plate in the expansion stretched the extrusion process, formed the wrong move at the wrong station . As the expansion joints filler material within the poor or improper sealing process, the board of the expansion and contraction and the effect of vehicle vibration is out and fall off. Road expansion joints properly handled, coupled with improper maintenance, is the bane of the early damage caused, will greatly reduce the life of the road. Concrete road surface of the dislocation, holes and other phenomena, it is difficult to repair, this situation also occurred in our city, repair of the effect is unsatisfactory, not only affects the appearance of the road, also resulting in economic losses. Control measures: expansion joints board to set the correct position, the force transmission lever must be parallel to the surfaces and the centerline, in the process of pouring concrete, to prevent force transmission lever is shifted. Filling material to heat cold can be a good choice, bond strength, and not fall off of the material, currently used with asphalt rubber and PVC packing clay. Expansion joint filler, to regular maintenance, the maximum distance between expansion joints in the winter, it will fail the filler and tick off the cracks of the debris, fill one new filling material, in order to ensure the normal use of expansion joints . 3. Vertical and horizontal seam is not straight vertical and horizontal seam is not straight, the beauty of the roads affected. The main reason is because the template is not firmly fixed, concrete pouring process easier in the run-mode, as well as the template itself, Washington is not enough. Control measures: a template should be strictly checked before use, shall not be used until smooth enough,
Beats By Dre Studio, the stiffness does not meet the requirements of the template, the template should be close links between the template to be firmly fixed on the base, with resistance to lateral pressure of concrete and construction interference adequate strength and control of the template profile with the theodolite I top degrees. 4. Board peeling, explicit, potholes in the use of some roads for some time, there will be surface hemp, off the road surface, exposed aggregate, potholes and so on. The main reasons are the following aspects: the process of pouring concrete in or just finished pouring the rain, the surface has not yet received final setting of the amount of water soaking, the water slurry diluted, can not be hardened into a loose state; grout failure, precipitated sand,
vibram five fingers outlet, the road surface after use by abrasion, exposing the aggregate. Water-cement ratio is too large,
herve leger skirts, the board of severe bleeding phenomenon or sprinkle dry cement powder, the surface loss is also one of the reasons. The materials used are not clean, with mud and other debris. These diseases affect the quality of road surface roughness and appearance, reduces the service life of concrete pavement, over time, increasing degree of damage is not conducive to road safety. Control measures: strict control of water-cement ratio, water-cement ratio not greater than 0.5. Measures to make rain, sprinkler maintenance to be timely. Strict material quality, gradation of aggregate do screening tests and clay content, prohibited the use of substandard materials. Concrete pavement by the above common causes of defects, hazards and prevention of, I think in the concrete road construction, should be strictly according to the drawings, the strict implementation of norms, strictly good quality material, constantly learning new techniques and raise the level of construction technology is to reduce or avoid damage to the concrete road surface of the important measures. Shao Fang concrete pavement common quality defects and anti-2003 1
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