Construction steps of foam concrete

Overview of lightweight concrete

Lightweight concrete, also known as foamed concrete, is to fully foam the foaming agent mechanically through the foaming system of the foaming machine, mix the foam and cement slurry evenly, and then pass the pumping system of the foaming machine for in-situ construction Or mold forming, a new type of lightweight thermal insulation material with a large number of closed pores formed by natural curing. It is a bubble-shaped heat-insulating material, and its outstanding feature is the formation of closed foam cells inside the concrete, which makes the concrete lightweight and heat-insulating; it is also a special variety in aerated concrete, and its pore structure and material properties are close For aerated concrete, the difference between the two is only the difference between the shape of the pores and the means of aerated concrete.

Construction technology of foam concrete cushion:

1. Grassroots cleanup

Use brooms, shovel and other tools to clean the foam concrete floor slab to avoid debris, hollowing, sanding, and dust falling.

2. Elevation control and finished product protection

Before pouring the foam concrete cushion, a foam concrete block with the same proportion as the ground cushion concrete must be prefabricated for ground reinforcement. The prefabricated height of the foam block is the designed pad height -5mm, so cement mortar can be used on site. Fix the bottom and use it horizontally. According to the design requirements and the +50mm line in the building to strengthen the ground, the setting principle is a plum-shaped layout. After the ground is reinforced, the finished and semi-finished products of the previous process (such as doors, lower thresholds of fireproof door frames, putty walls, etc.) must be protected and pre-packaged to avoid contamination.

3. Formwork support and base layer watering and moisturizing

According to the design requirements, support the side formwork according to the construction scope of the foam concrete pad (for example: 300mm from the bathroom door, kitchen door, radiator root, etc.). The template is supported by square timber and bamboo plywood. The verticality and flatness of the panel must be ensured. After the support of the formwork is completed, water the ground to wet it. Due to the low water absorption rate of foamed concrete, it is recommended not to over water to ensure that the ground is moist.

4. Production of foam concrete

(1) The production of bubbles

Foam preparation uses a special preparation machine (foam generator). The preparation principle is a physical method, and the foaming agent is input into the automatic foaming system through an air compressor to prepare foam.

(2) Production mixture

According to the needs of the project, select the foam concrete mixture preparation machine. First, add a certain amount of water to the mixer, and then put the weighed cement and admixtures into the mixer for mixing for no less than 2 minutes.

(3) Formed foam concrete

After the mixed materials are evenly mixed, they are mixed with the foaming agent in the pipeline and transported by the high-pressure pump to the construction site for pouring and molding.

5. Pouring molding

First, water and wet the cleaned ground, and then pump the configured foam concrete on-site to the corresponding building floor to pour the ground cushion. In the pouring process, two people work at the same time, and one person holds the pouring tube to perform pouring. The ground cushion and pouring surface should be leveled and shaped at one time. Another person will hold a 2m scraper until the pouring volume reaches the calibrated height, and then slide the newly poured concrete from the inside to the outside. After surviving, the finished product must be protected, and the channel must be temporarily closed. In order to avoid cross-working damage. Foamed concrete is a viscous fluid, which contains a large amount of air and adsorbed water. The discharge pipe shall not enter or exit the foamed concrete to avoid destroying the bubbles. The formwork can only be removed after the foamed concrete has cured. The foamed concrete must be used up within 1 hour after mixing, otherwise it cannot be used continuously.

6. Protection and maintenance of finished products

After pouring the foam concrete cushion, the passages, entrances and other components must be sealed, and 24-hour care must be specified, and only professional maintenance personnel can be allowed to enter and exit during the care. The foam concrete cushion layer should be maintained by moisturizing and watering after 12 to 14 hours of casting and molding, and the curing time should not be less than 72 hours.

Quality Assurance Measures

1. The type and specification of foam concrete should conform to the design and relevant standards. For foamed concrete foamed on-site, its mixing ratio should be accurately measured and evenly mixed, and its thermal conductivity, density and compressive strength should be randomly observed and inspected.

2. Before a large-scale construction project, a model guidance system must be adopted. After the model technology is qualified, the model can be promoted in a larger range. After the model is made, the test block must be retained for compressive strength test, and it can be used only after the test is qualified.

3. The "three inspection system" must be strictly implemented during the construction process, that is, self-inspection, mutual inspection, and handover inspection. Only after passing the inspection can proceed to the next step.

4. Tap water or purified water must be used as construction water. It is strictly forbidden to mix acidic water into the foaming agent to avoid chemical reaction and affect the foaming effect of the foaming agent.

5. After pouring the foamed concrete, the entrance must be closed, and a special person must be assigned to be responsible for 24-hour maintenance. It is forbidden to rise before the final setting. After reaching the strength, a dedicated person must be sent for maintenance immediately to ensure the strength of the foam concrete cushion and avoid cracking.

6. The construction environment temperature of foam concrete must be higher than 5°C, and construction in high temperature weather should be avoided.

Comprehensive comparative analysis

Compared with the original design of lightweight aggregate concrete, after using foamed concrete as the floor mat of the residence, it has the following advantages:

(1) Reduce the load on the floor and make the structure stronger.

(2) Enhance the sound insulation between the floors to make the design more humane.

(3) Provide good thermal insulation performance for the pipeline in the cushion layer, reduce the adverse effect of thermal expansion and contraction on the pipeline, and extend the service life of the pipeline.

Application of lightweight concrete

Lightweight concrete is widely used in energy-saving wall materials due to its good characteristics, and has also been used in other areas. At present, the application of lightweight concrete in China is mainly cast-in-place roof insulation, lightweight wall panels, and compensation foundations. However, making full use of the good characteristics can continuously expand its application in construction engineering, speed up the project progress, and improve the quality of the project.

Lightweight concrete price

The price of lightweight concrete will vary randomly according to the production cost of lightweight concrete, transportation cost, international situation, exchange rate and demand of market supply and demand. Tanki New Materials Co., Ltd. aims to help all industries and chemical wholesalers find high-quality and low-cost nanomaterials and chemicals by providing turnkey customized manufacturing services. If you are looking for lightweight concrete, please feel free to send the latest inquiry price of lightweight concrete.

Lightweight concrete suppliers

As a global supplier of lightweight concrete bodies, Tanki New Materials Co., Ltd. has extensive experience in the performance, application and cost-effective manufacturing of advanced engineering materials. The company has successfully developed a series of powder materials (including boron carbide, aluminum carbide, titanium carbide, etc.), high-purity targets, functional ceramics and structural devices, and provides OEM services.