Construction Methods of AAC Block

AAC block is generally used in infill walls, and the strength grade of the used blocks is generally A3.5 for partition walls and A5 for external walls. The strength of the mortar is not less than M5.

Before building aerated concrete blocks, a block arrangement diagram should be drawn according to the plan and elevation of the building. Set the skin count bar at the corner of the wall, draw the block skin number and block height on the skin count bar, and draw the alignment line between the upper edge lines of the opposite block, and build according to the alignment line.

The masonry surface of aerated concrete blocks should be watered appropriately. Masonry aerated concrete should use special tools (laying shovel, saw, drill, engraving, straight frame, etc.).

The vertical mortar joints of the upper and lower skin blocks of the aerated concrete block wall should be staggered, and the staggered length should be 300mm and not less than 150mm. If it is not possible to meet the requirements, 2Φ6 tie bars or Φ4 steel mesh pieces should be installed in the horizontal mortar joints, and the length of tie bars or steel mesh pieces should not be less than 700mm.

The mortar joints of aerated concrete block walls should be horizontal and vertical, with full mortar. The mortar fullness of horizontal mortar joints should not be less than 90%; the mortar fullness of vertical mortar joints should not be less than 80%. The thickness of the horizontal mortar joint and the width of the vertical mortar joint shall not exceed 15mm.

At the corners of the aerated concrete block wall, the blocks of the vertical and horizontal walls should be laid on each other, and the end faces of the partition blocks should be exposed. At the T-shaped junction of aerated concrete block walls, the cross-wall blocks should be exposed on the sidewalls and sit in the middle of the vertical wall blocks.

If there are no effective measures, the aerated concrete block wall shall not be used in the following parts:

The part below the moisture barrier of the building;

Long-term flooding or chemical erosion of the environment;

Walls that have been in a vibration source environment for a long time;

The surface of the block is often in a high temperature environment above 80℃. No scaffold eyes shall be left on the walls of aerated concrete blocks. The block walls in each floor should be built continuously without any connection and rubbing. If it is necessary to leave the chase, it should be kept as an oblique chase or intermittently on the side of the door and window opening.