In 70 and 80s, especially in the early 80s, the precast slab used to fire a. At that time, the commercial concrete has not formed the scale. Cast in situ concrete floor is used in the construction site of the concrete mixing, mixing machinery is also very simple, the quality is uneven. And the choice of precast floorslab result quality assurance, and secondly economy. Third, the construction speed is quick, very much in line with the trend of building industrialization.

But by the late 80s, with the improvement of urban living standards, coupled with the popularity of commercial concrete, professional mixing station, new tools, etc., the shortcomings of the prefabricated floor is increasingly exposed.

First room the standard width of a room size is prefabricated modular constraints, only small standard width of a room, wall is very dense, building facades cannot therefore guise. So, we turn our attention to the way of cast-in-place floor.

Cast in place floor because it is cast, so, as long as the mechanical analysis allows, the template can shape the shape, it can be achieved, and even can be said that only think, and not do not. On the other hand, now casting slab due to the whole casting, so seismic performance is better than that of the precast floor slab, common in the prefabricated Banlou body temperature joint quality defects in cast-in-place Banlou also eliminated. Commercial concrete, professional mixing station, the popularity of the new pump car has promoted the popularization of the cast-in-place floor, especially in the cast-in-place floor.

From the appearance, the appearance of the casting plate and the prefabricated plate can be distinguished. Because of the construction technology, the floor, ceiling and other large surface of the precast slab floor is not as smooth as the floor. If the seams between the grouting treatment is not good, at the bottom of the plate will have a more pronounced waterline. Now, commonly used in the plate width of 880mm, 1180mm two specifications, so, the above mentioned traces will be distributed in parallel with this interval.