(1) Aerator block The masonry must strictly comply with the technical index requirements of the national standard Code for Acceptance of Construction Quality of Masonry Engineering (GB 50203-2002).
(2) Reasonably arrange the construction period and do not rush blindly. If possible, masonry shall be avoided in rainy seasons all the year round.
(3) The masonry mortar should be a special mortar with good bonding performance, and its strength grade should not be less than M5. The mortar should have good water retention and can be mixed with inorganic or organic plasticizers. If possible, special aerated concrete masonry mortar or dry mortar shall be used.
(4) In order to eliminate the shrinkage cracks caused by temperature changes between the main structure and the enclosure wall, tie bars must be reserved at the junction of the block and the wall column, with a vertical spacing of 500~600mm (depending on the height specification of the selected product), and 2 Ф 6 Rebar, with both ends extending into the wall no less than 800mm; In addition, 2 Ф 6. The full-length reinforcement is tied to prevent the wall from shrinking and cracking.
(5) Structural beams and columns are set in walls with large spans or heights. Generally, when the wall length exceeds 5m, reinforced concrete structural columns can be set in the middle; When the wall height exceeds 3m (≤ 120 thick wall) or 4m (≥ 180 thick wall), reinforced concrete waist beam can be added at the middle and middle waist of the wall.
(6) The junction between the window sill and the wall between windows is a stress concentration position, which is prone to cracks caused by masonry shrinkage. Therefore, it is advisable to set reinforced concrete cast-in-place belts at the window sill to resist deformation. Cracks and hollowing are also likely to occur at the corners above the door and window openings. Ring beams should be used here to replace lintels.
(7) The concave and convex parts of the aerated concrete exterior wall in the horizontal direction (such as moldings, rain covers, cornices, windowsills, etc.) should be flashing and dripping to avoid ponding.
(8) Before masonry, calculate the number of bricks and rows according to the size of the block, check and correct the tie bar. A certain height of plain concrete with the same thickness as the wall can be poured in advance at the root of the wall. At present, the common practice is to lay two red bricks, so that the top one has a gap of about 20mm high, so that solid auxiliary small blocks of the same material as the original blocks can be used for oblique masonry, and squeezed firmly.
(9) Due to different dry density and strength grade Aerated concrete block The performance indexes of aerated concrete blocks with different dry densities and strength grades are different, so aerated concrete blocks shall not be mixed with other bricks and blocks.
(10) Strictly control the moisture content of the upper wall of aerated concrete block. According to relevant specifications and regulations, the moisture content of aerated concrete blocks during construction should be less than 15%, and for fly ash aerated concrete products should be less than 20%. The drying shrinkage law of aerated concrete shows that the shrinkage value of the moisture content between 10% and 30% is relatively small (generally 0.02~0.1mm/m). According to experience, it is appropriate to control the moisture content of aerated concrete blocks at 10~15% during construction. The depth of water content of blocks should be 8~10mm in the surface layer. The depth of water content of the surface layer can be determined according to experience by scraping or tapping a small edge to observe the law. Generally, water 24 hours before masonry. The amount of water shall be determined according to the season and dry and wet temperature at the time of construction, and controlled by the surface wetness. It is prohibited to directly use blocks that are full of rain or excessively watered.
(11) The masonry height of aerated blocks shall be controlled within 1.4m every day. The masonry height of aerated blocks shall be controlled within 1.2m every day for spring construction. Masonry shall be stopped in rainy days. When the masonry reaches about 200mm from the beam bottom, it shall be stopped for 7 days, and after the deformation of the masonry is stable, it shall be tightly pressed with solid auxiliary small blocks of the same material.
(12) When building aerated blocks, the mortar joints shall be horizontal and vertical. The upper and lower layers shall be staggered. The corners shall be interlocked with each other. The mortar shall be full. The horizontal mortar joints shall not be more than 15mm, and the vertical mortar joints shall not be more than 20mm. The mortar plumpness shall be more than 90%. The vertical joints should be filled with internal and external temporary plywood. After building, the mortar joints shall be immediately marked with the original mortar inside and outside to ensure the mortar plumpness.
(13) The construction joint of the wall must be built into a diagonal tenon, and the length of the diagonal tenon shall not be less than 2/3 of the height
