多层室庐砼小型空心砌块墙体裂缝操纵(国外英文资料).docVIP

多层住宅砼小型空心砌块墙体裂缝控制(国外英文资料) Multi-storey residential concrete small hollow block wall cracks control As countries protect arable land, measures of implementation, the use of clay brick is gradually under control, concrete small hollow block started getting more and more application in residential projects. Now completed concrete small hollow block from Shanghai multi-storey residential overall look, most of the engineering quality is good, but there are also some multilayer residence there are cracks in the wall. In order to make concrete small hollow block housing project quality can make more users are satisfied, and reduce the crack influence on housing quality, must therefore be on the wall crack under effective control. The parts and characteristics of the cracks The most commonly seen fissures in multi-storey houses are the terraced cracks in the upper wall of the wall. Horizontal crevices occur between the roof and the wall of the wall or the bottom of the beam and the wall. There is a vertical crack in the lower sill of the windowsill, and the two corners of the window-sills and the top wall of the upper wall have the diagonal cracks. Vertical cracks exist in the phase junction of reinforced concrete columns and concrete small, hollow blocks of concrete. Cracks are created around the block. The cause of the fissure The elements of the small block itself. First, small, hollow concrete blocks are concrete made from gravel or pebbles, and it has the brittleness of concrete. Block at the same time there is a significant characteristic of drying shrinkage, after 28 days natural curing, drying shrinkage is about 60% complete, so the concrete small hollow block with will inevitably occurred cracks in the wall; Secondly, used in concrete small hollow block and masonry mortar material such as cement, lime, sand source is very wide, its performance is not stable, so it will affect the quality of the brick and masonry mortar. The effect of temperature. The temperature d