What are the technological process and construction points of aerated concrete block infilled wall?

What are the technological process and construction points of aerated concrete block infilled wall? The following Zhong Da consults the bidding teacher to answer your questions for your reference.

Process flow:

Elastic wall line → determine the number of poles → determine the masonry method → pour block → mix mortar → arrange block → build block wall → pour ring beam, constructional column and other concrete components → acceptance.

Key points of construction:

(1) After the structural experience is qualified, according to the control axis in the foundation or floor, the axis of the wall and the position line of the door and window openings are measured in advance, and the position elevation lines of the door top and the window sill top are marked on the wall or column. Wall masonry can be carried out only after it is accepted by the quality department.

(2) Cleaning at the grass-roots level Before bricklaying, the grass-roots level should be cleaned up, and the laitance and dust on the wall should be cleaned and rinsed, and the grass-roots level should be wetted with water.

(3) When arranging bricks, the number of skins and rows must be calculated according to the design size, block modulus, horizontal mortar joint thickness and vertical mortar joint width, and the number of skins and mortar joint thickness of bricks should be set out on the skin pole or column wall, and the elevation of windowsill, hole and ring beam should be marked to ensure the masonry size.

(4) When arranging blocks, try to use standard blocks, and use less or no special-shaped blocks. When autoclaved aerated concrete blocks are laid, the product age should exceed 28d.

(5) During transportation and loading and unloading of autoclaved aerated concrete blocks, throwing and dumping are strictly prohibited. After entering the site, it shall be neatly stacked according to varieties and specifications, and the stacking height shall not exceed 2m. Aerated concrete blocks should be rain-proof.

(6) When laying autoclaved aerated concrete blocks, the masonry surface should be properly watered.

(7) When autoclaved aerated concrete blocks are used to build walls, sintered common bricks, perforated bricks or cast-in-place concrete windowsills should be used at the bottom of the walls, and the height should not be less than 200mm.

(8) In the process of masonry, always check the axis and sideline of the wall. When the hanging line is too long, check whether it meets the requirements of straightness and flatness to prevent the axis from shifting.

(9) The mortar mixture ratio is determined by the laboratory, and the mass ratio is adopted. Mortar should be mechanically stirred, and mortar for masonry should be mechanically stirred evenly and used as it is mixed. Cement mortar and mixed mortar should be used within 3h and 4h respectively. Fine stone concrete should be used up within 2h.

(10) The mixing time of cement mortar and cement mixed mortar shall not be less than 2min, mortar mixed with additives shall not be less than 3min, and mortar mixed with organic plasticizer shall be 3 ~ 5 min. At the same time, it should have good workability and water retention, and the general consistency is 5 ~ 7 ㎝. The batching accuracy of additives and organic plasticizers should be controlled within 2%, and other batching accuracy should be controlled within 5%.

(1 1) In each layer or every 250m3 masonry, at least one set of test blocks (six in each group) shall be made for mortar or concrete of each strength grade. If the strength grade or mixture ratio of mortar and concrete changes, test blocks should also be made for inspection.

(12) The vertical mortar joint width and horizontal mortar joint thickness of autoclaved aerated concrete block shall be 20mm and 15mm respectively. The fullness of horizontal mortar joint of aerated concrete masonry infilled wall should be greater than 80%, and the vertical mortar joint should be filled with mortar after being clamped by temporary splint, and there should be no through joint, blind joint and false joint.

(13) The construction hole should be retained on the larger wall, and its side should not be less than 500㎜ away from the junction wall. The clear width of the hole should not exceed1m. When repairing the overlay hole, the joint surface must be cleaned, watered and wetted, and filled with mortar to keep the mortar joint straight.

(14) When laying mortar for aerated concrete masonry, the length of masonry mortar shall not exceed 750㎜. When the temperature exceeds 30℃ during construction, the slurry laying length shall not exceed 500㎜.

(15) When laying, try to arrange test blocks in advance, giving priority to the whole block. When it is necessary to disconnect the test block, tools such as hand saw and cutting machine should be used to cut it neatly and protect the edges and corners of the masonry. The mortar joint between the upper and lower skins shall be staggered, and the length of mortar joint shall not be less than 1/3 of the total length of the block. When the build by laying bricks or stones length is less than 150㎜, the so-called joint is formed, and the vertical joint should not be greater than 2 skin blocks.

(16) During masonry of mixed water wall, attention should be paid to scraping off the ash stains (tongue ash) overflowing the wall surface at any time and leveling them off. Half a brick should be dispersed. When laying the first leather block on the first floor or floor, check the number and elevation of leather poles.

(17) The daily masonry height of the wall shall not exceed1.8m. No feet, hands and eyes shall be left on the filler wall, and no scaffolding shall be erected.

(18) The reserved holes and walls shall be laid according to the design requirements, and the walls shall not be cut afterwards. The location, specification, quantity and spacing of the seismic Rachel reinforcement of the wall shall be retained according to the design requirements, and shall not be misplaced or missed.

(19) When building doors and windows, if the door window frame is erected first, the block should be about 3mm away from the door window frame. If the door and window frames are plugged afterwards, they should be laid in the right position (generally, the line width is 10 ~ 20 mm larger than the actual size of doors and windows).

(20) The connection between the autoclaved aerated concrete block filled wall masonry and the back plug doors and windows can be realized by embedding wooden bricks or concrete precast blocks. After anticorrosion, wooden bricks can be embedded in precast concrete blocks and laid together with aerated concrete blocks. The size of precast concrete blocks shall conform to the masonry modulus.

(2 1) When the aerated concrete infilled wall is built near the bottom of beam and slab, there should be some air holes. After the infilled wall is laid, at least 7 days later, the sintered standard brick or perforated brick should use 60? Oblique build by laying bricks or stones is dense, to prevent the upper masonry from cracking due to mortar shrinkage. It is forbidden to cross build by laying bricks or stones and swing.

(22) The corner of masonry and the intersection of vertical and horizontal walls should be laid at the same time, and the blocks should be staggered. The upper and lower skin blocks of masonry should be laid alternately, and the overlapping length should not be less than 1/3 of the block length. The minimum build by laying bricks or stones length shall not be less than 150㎜, and the vertical joint shall not be greater than 2 skin block height.

(23) The vertical mortar joint of masonry should avoid forming a joint with the edge of the hole such as doors and windows.

(24) Before laying, the blocks should be arranged according to the actual size of the wall section and the size of the blocks. If the block is smaller than the whole block, it can be sawed to the required size, but it shall not be less than 1/3 of the block length. When the bottom thickness of mortar joint is greater than 20mm, it shall be leveled and paved with fine stone concrete, and the mixed mortar shall not be less than M2.5 It shall be laid by full spreading and extrusion method, with the upper and lower skins staggered and the corners overlapped. At the T-joint of the block wall, the skin of the cross wall block should be exposed.

(25) Aerated concrete blocks with different dry densities (bulk density) and strength grades should not be mixed. It shall not be mixed with other bricks and blocks, but the local use of sintered ordinary bricks or perforated bricks at the bottom of the wall, the top of the wall and the openings of doors and windows shall not be regarded as mixed masonry.

(26) The reinforcement position of constructional column is correct, the overlapping length of reinforcement meets the specification requirements, and the Rachel reinforcement of the wall should be extended into the constructional column, and the spacing is not more than 500㎜.

(27) Frame columns, shear walls and other structural parts should be embedded? ⑥ Wall reinforcement and constructional column, ring beam steel dowel, or wall reinforcement, ring beam and constructional column steel dowel are implanted after structure construction.

(28) During the construction of autoclaved aerated concrete block infilled wall, the constructional column should be designed in strict accordance with the design requirements. When there is no requirement in the design, a constructional column should be set every 5m according to the wall length. In addition, constructional columns are arranged at the end of the wall, at the corner and at the intersection of vertical and horizontal walls.

(29) attention should be paid to make the constructional column wall build by laying bricks or stones into a horse tooth if, when setting Rachel reinforcement, it should start from the column foot and proceed backwards first. The advance and retreat size should be 60㎜, and the advance and retreat height should be 1 ~ 2-storey plot, and it should be around 300㎜. The lower end of the block should be cut into a 45 inclined plane to ensure that the upper corner is dense when pouring concrete. The floor ash and brick slag in the constructional column should be cleaned to prevent slag inclusion, so as not to affect the integrity of the constructional column.

(30) The position, anchorage length and lap length of ring beam, constructional column and wall Rachel should meet the design and specification requirements.

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