Lightweight foam concrete construction precautions

Lightweight foam concrete construction precautions

Foam concrete with different strengths shall be constructed in strict accordance with the design requirements. The anti-seepage geomembrane on the top of the foamed concrete subgrade shall be laid under the metal mesh, and the lap joint shall be thermally welded, and the lap width shall not be less than 10cm.

When laying, it should be flattened and tightened to avoid local rolling up. If necessary, U-shaped nails can be used for anchoring. When laying the metal mesh, U-shaped nails should be used for anchoring, the longitudinal anchorage spacing is 2m, and the transverse anchorage spacing is 1.0m. The plane position of the metal mesh should be overlapped and overlapped, the width of the overlap should not be less than 5cm, and the overlap should be bound with plastic buckles and anchored with U-shaped nails.

Before the lightweight concrete is poured, according to the boundary conditions of the construction site, the pouring area and the pouring layer are first divided, and the base is checked to ensure that the base is free of debris and water, and the base elevation meets the design requirements and should meet the following requirements:

1) The top surface area of a single pouring area should not exceed 400m2.

2) The length in the long axis direction of a single pouring area should not exceed 20m.

3) 1.8cm thick wooden plywood is used to support the spacing and joints in the adjacent pouring area. The wooden plywood is a temporary support template and is also used as a deformation joint filling and must not be removed.

4) The thickness of the single-layer pouring layer should be controlled within the range of 0.3-1.0m.

5) The thickness of 0.8m at the top of the lightweight foam concrete subgrade must be used as an independent single-layer pouring layer, and the layer should be poured at one time in each pouring area.

Construction Control Points

1) For the adjacent pouring layers in the same section, when the temperature during the construction period is not lower than 15℃, the shortest pouring interval can be controlled by 8 hours; otherwise, the pouring interval should not be less than 12 hours.

2) The pouring construction time of the pouring layer in a single pouring area of Lightweight concrete should be controlled within 2 hours.

3) It should be poured from one end to the other end along the long axis of the pouring area; if more than one pouring pipe is used for pouring, it can be poured side by side from one end, or the diagonal pouring method can be used.

4) During the pouring process, when the pouring pipe needs to be moved, it should be moved back and forth along the direction in which the pouring pipe is placed, and it is not appropriate to move the pouring pipe left and right; Move to the soil surface.

5) During the pouring process, the discharge port of the pouring pipe should be placed below the current pouring surface as much as possible; in other situations such as the surface being leveled, the distance between the discharge port of the pouring pipe and the current pouring surface should not be higher than 1.5m.

Care and Maintenance

After the top surface of the lightweight concrete pouring area is poured to the design elevation, the surface should be covered with plastic film to moisturise and maintain the light soil roadbed; or the non-woven geotextile covering and watering should be used for maintenance. The curing time is not less than 7 days. 

Before the top of the light soil subgrade is filled with soil, it is strictly forbidden to drive construction machinery on it; if it is unavoidable in some areas, a temporary protective layer with a thickness of not less than 50cm should be laid at a suitable position or covered with steel plates as a temporary access road for Construction machinery travels.

Connection with other processes

The top improved soil must be constructed when the maintenance strength of Lightweight Concrete reaches 1.5MPa under the same conditions. During construction, it is strictly forbidden for large machinery such as dump trucks, road rollers, and bulldozers to directly walk on the top surface of the lightweight soil. Paving and rolling are carried out in the forward way of leveling and side-rolling, that is, the unloading truck and road roller should unload and walk at the rear end of the leveling machine.

During the rainy season, special measures should be taken for temporary waterproofing and drainage, focusing on the prevention of soil erosion. Measures such as film covering and temporary drainage ditch should be adopted to avoid slope erosion and prevent a large amount of water and soil from flowing to the lower light soil pouring surface for pollution. Light soil.

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Before the construction of foam lightweight soil, it is necessary to ensure that the foundation pit is level and free of water accumulation.