Excellent Methods to Break Up Absolutely Two

This steel is necessary since, though very strong when subject to compressive forces—cement is weak under tension loads (it is only one-tenth as strong in tension as it is in compression). Cement by itself tends to crack under loads or as the result of contraction and expansion caused by temperature changes. When any pavement slab or support beam is subject to an applied point load or spread load it will want to compress in its upper layers and tense in its lower layers as it bends under these loads. Similarly, buried pipes, footers, fountain walls, and cement columns will experience similar reactions to applied loads. Steel, on the other hand, is very strong in tension. So steel reinforcement in the form of either a wire mesh (for cement that will be lightly loaded) or crisscrossed steel rebars spaced and sized to handle the anticipated tension is embedded in cement portions that are expected to go into tension.

Cement reinforced with steel is the basic building material of modern construction. It is used to manufacture pipeline segments that are joined together to make buried sewer lines. Buried building foundations of supporting footers of cement can extend tens of feet to hundreds of feet below the surface depending on the type and size of the building. Pavements and slabs constructed of reinforced cement are typically found at the ground surface. Support columns, arches, and beams extend from below the ground surface to the maximum height of the structures they form. Cement’s versatility and ability to be cast in place and shaped to purpose by forms, and capacity to be strengthened by steel reinforcement makes it the most useful of construction materials. These characteristics also make reinforced cement difficult to break up and excavate and expensive to haul away and recycle.

Planning and Preparation

The pervasiveness of reinforced cement makes it the most common man-made material encountered during excavation jobs performed as part of demolition operations. When planning for the excavation and removal of old, in-place cement, two questions have to be asked. First, how much cement is there? Second, what kind of cement has to be removed?

Often, the amount of in-place cement that has to be removed is easily determined from existing construction plans and as-built drawings and from site surveys. These will show the dimensions (length, width, thickness, and diameter) of in-place cement structures as well as their location (northing, easting, elevation, depth, gradient, and extent). The plan details should also describe the type and amount of steel reinforcement that needs to be removed: plain (no steel reinforcement), mesh (shrinkage and temperature reinforcement), dowel (discontinuous rebar reinforcement placed only at the cement joints), or continuous steel reinforced. Generally speaking, the greater the amount and extent of steel reinforcement, the harder it is to break up and remove the in-place cement.

The volumes of other cement structures can be more difficult to determine. Cement can be formed into complicated shapes whose volume is not easily calculated. Even relatively simple structures, such as a multilevel parking garage, require extensive and detailed computations to determine the amount of cement in-place. More complicated reinforced-cement structures also contain highly variable amounts of steel reinforcement in various locations and configurations. Planning for the demolition and excavation of cement structures must take into account the need to break up the cement and manage the scrap steel produced during the process. The typical unit of measurement and payment for cement demolition and excavation is the cubic yard. For simple structures, the end-average method is used to determine the amount of in-place cement.

As the professional manufacturer of complete sets of mining machinery, such as Rock crushing plant,mobile jaw crusher,stone production line,Cement equipment, Henan Hongxing is always doing the best in products and service.