Curing requirements for aerated concrete blocks

Aerated concrete blocks should pay attention to certain specifications and standards in the construction process, and there should be certain requirements for construction details, aerated concrete blocks are widely used in various construction industries, and in order to prevent cracks in concrete during the construction process, the following should be paid attention to:

1) The construction process often needs materials of different materials, the most common is concrete blocks and steel bars, steel bars often form some filling materials in the process of use, so that lightweight aerated concrete blocks and reinforced concrete blocks belong to different materials of materials, wall cracks caused by differences in physical properties are inevitable, but if the construction is standardized, the selected materials can still reduce the cracks to a minimum.

2) The thickness of the ash joint should be reduced as much as possible when the fly ash aerated concrete block is stacked, and the gap should not be less than 30mm at the bottom of the beam and slab, and the void filling should be carried out more than 3 days after masonry. The filling material should be filled with fine stone concrete (mortar shrinkage is greater than concrete), or used side bricks or standing bricks to be obliquely tightened.

3) In the manufacturing process of the block, because of the internal tension and external pressure, it is easy to produce block cracks, which belongs to its own block cracks, which are often proved to be substandard products, and also in the process of concrete block use, there may be no cracks when used, but after pouring with water, there is a shrinkage, so that the cracks are generated. It is shown that the moisture content of the aerated concrete block should be controlled below 15% when it is to be constructed, the block should be watered and moistened 24h before masonry, and the masonry surface should reach a saturated and dry state.

4) The project is not as fast as possible in the process of stacking, especially the block building, the daily workload is to be controlled, the daily masonry height should be controlled below, the block lap size is controlled according to the standard, the damaged block shall not be used, the brick knife and other broken blocks shall not be used, the special tools should be used to cut, and the same batch of concrete blocks should be used to build the same wall. When the length of the block wall is greater than 5m, structural columns and tie ribs should be added, and when the height is greater than 4m, ring beams should be added, and steel wire mesh sheets should be added at the junction of the wall and beams, plates and columns.

5) Before masonry, the block arrangement diagram should be designed according to the wall size, and the upper and lower lap joints of the block should be considered at the same time, and the lap length should not be less than 1 3 of the length of the block, and not less than 150mm. When some parts of the lap can not meet the requirements, can be provided in the horizontal ash joint 2 6 steel bar or 4 reinforcement mesh piece reinforcement, length not less than 500mm.

The curing process of aerated concrete blocks is done in an autoclave, which is different from ordinary concrete hollow blocks (this one takes 28 days), the national standard, and five days to leave the factory.

According to the implementation standard, it can be built on the site after 28 days, and it can be shipped in 3-5 days in actual use.

Summary. Hello, concrete aerated block lime and cement as raw materials, after batching and pouring, gas expansion, cutting and curing and other processes made of lightweight thermal insulation new building materials, the process is divided into raw material transportation, lifting and grinding, measuring, pouring, curing and other processes. It is characterized by light bulk density, high thermal insulation performance, noise insulation, and processability.

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Hello, concrete aerated hidden block lime and cement as raw materials, after ingredient pouring, gas expansion, cutting and maintenance and other processes made of slippery spring light thermal insulation new building materials, the process is divided into raw material transportation, lifting and grinding, measuring, pouring, curing stove and other processes. It is characterized by light bulk density, high thermal insulation performance, noise insulation, and processability.

1. The aerated mixed spring concrete block is suitable for all kinds of inner and outer filling walls above the ground of Liangsun buildings and the inner filling walls below the ground, except for the walls with special requirements. Aerated concrete blocks should not be built directly on the floor or ground. For the root of the wall that is often subjected to alternating dry and wet, it is advisable to pour a C20 plain concrete wall mat with a width of the same wall thickness and a height of not less than; For other walls, autoclaved lime sand bricks should be used to build masonry at its root, with a height of not less than 0.

2m wall mat. 2. These parts shall not be used for aerated concrete blocks: the following parts of the building (except for the basement indoor filling wall); Long-term immersion in water or frequent alternating wet and dry areas; Environments subject to chemical attack, such as strong acids, alkalis, or high concentrations of carbon dioxide; The surface of masonry is often in a high temperature environment above 80; Roof parapet.

The masonry surface of aerated concrete blocks should be sprinkled with an appropriate amount of water.

Aerated concrete block masonry and painting also need to take watering measures, aerated concrete walls generally use cement mortar as the surface stucco layer, in order to ensure that the cement in the cement mortar has enough moisture to hydrate after painting the wall, before masonry are poured enough to absorb water.

However, aerated concrete absorbs water slowly, especially for walls that have been built, and needs to be watered many times. The amount of watering should be determined according to the season and dry and wet temperature conditions at the time of construction, and the surface wetness should be controlled. It is forbidden to use blocks that are saturated with rain or overwatered.

1. Aerated concrete block masonry must strictly comply with the requirements of the national standard "Code for Acceptance of Construction Quality of Masonry Engineering". When building a masonry wall, the production age of aerated concrete blocks should be more than 28 days. Cracked, irregular and contaminated aerated concrete blocks must not be used.

It is strictly forbidden to use dry bricks or water-saturated bricks. 2.Release the edge of the wall at the masonry position, use the height of each skin of the block to make a number of poles, and stand at both ends of the wall.

The number of poles should be set at the corners of the wall, and their spacing should not be greater than the moisture content of the masonry of the strictly controlled aerated concrete block wall. 4.The bottom of the block wall should be built with a small piece of solid cement bricks (or tamping C10 concrete), and its height shall not be less than the mortar with good cohesiveness, and its strength grade shall meet the design requirements.

Aerated brick is a kind of aerated concrete block made of fly ash as raw material, and then added with cement, lime, foam stabilizer and other materials, and processed by high-temperature autoclaving equipment. It has the advantages of light weight, high strength, heat preservation, sound insulation, and earthquake resistance. Secondly, aerated bricks can be made into wall blocks, insulation blocks, pressure plates, floor slabs, wall panels and insulation pipes, which are widely used in load-bearing or non-load-bearing structures and pipeline insulation of industrial and civil buildings.

Legal analysis: 1. The on-site stacking time between the entry of the block and the upper wall shall not be less than 28 days.

2. Use a brush on the aerated block to mark the date of entry, and make a sign to indicate the date of entry and the inspection situation.

3. After the materials enter the site, they should be stacked neatly according to different production dates and specifications.

4. The stacking of aerated blocks should pay attention to safety and stability, and the height should not exceed two meters (no more than 6 bricks) Legal basis: "Standard Specification for the Construction Points of Aerated Concrete Blocks" Before the start of the masonry project, all the units of the construction unit shall be confirmed by Party A and the supervisor before the large-scale wall masonry construction can be carried out.