Polystyrene foam concrete, many people's impression of polystyrene is a disposable lunch box. In fact, polystyrene can be used not only as a lunch box, but also to build a house. Polystyrene foam concrete can be used as foundation. The following is the relevant content I have compiled. Let's have a look.

Polystyrene Foamed Concrete 1 Foamed Concrete Used in Highway Backfilling

1. The main advantages of filling embankment on soft foundation are as follows:

1, which can greatly reduce the fill load, reduce the additional stress of soft foundation, restrain the settlement and lateral displacement of soft foundation and improve the stability of embankment.

2. It can simplify or even cancel soft foundation treatment and simplify the structural design of underground structure in soft foundation embankment.

3. The construction period is short. Especially for low-filled embankment (even if the foundation is deep soft foundation), through appropriate mechanical calculation, the replacement depth, bulk density and strength of foam concrete are determined by using the lightness of foam concrete, and the original soft foundation can be directly replaced under the condition that the force of embankment and various traffic loads on the foundation after replacement does not exceed the "natural ultimate bearing capacity" of the foundation, thus shortening the construction period required for soft foundation treatment.

Second, used for abutment backfill.

Using foam concrete technology to alleviate the problem of bump at the bridge head, the gradient change of settlement curve near the junction of abutment and subgrade should be slowed down and homogenized, that is, the transition section meeting the requirements of continuous and uniform settlement should be filled between abutment and subgrade junction. According to the causes of bump at the bridge head and the main characteristics of light soil, filling wedge-shaped foam concrete between abutment and subgrade can achieve the above purpose. Its advantages are mainly reflected in the following aspects:

1, which can greatly reduce the fill load, reduce the additional stress of soft foundation, restrain the settlement and lateral displacement of soft foundation and improve the stability of embankment.

2. Alleviate the sudden change of material stiffness at the junction of abutment and subgrade.

3. Completely eliminate the post-construction settlement of the filler itself.

4. The fill itself can stand on its own feet, and there is almost no restriction on the abutment structure;

5. The construction period is short.

Third, it is used for road widening.

Main advantages of foamed concrete in widening roads:

1, which can be filled vertically, saving land, reducing demolition and saving investment. Widening on the basis of the old road, there is almost no need to requisition land again.

2. When expansive fill is carried out in soft soil foundation, the load of fill can be greatly reduced, the settlement difference between new and old embankments can be reduced, the damage of additional settlement to buildings near embankments can be avoided, and the maintenance cost after highway operation can be greatly reduced;

3. The foam concrete is pumped through the pipeline, and the working face is small, which hardly affects the existing traffic;

4. The short construction period can make the project put into use in advance, which will bring investors early benefits.

Foamed concrete is a kind of lightweight microporous concrete, which is made of foaming agent by physical method, then added into slurry made of cement, aggregate, admixture, admixture and water, and mixed, stirred, poured, molded and cured.

Polystyrene foam concrete 2 foam concrete has the following properties and advantages:

1, heat insulation, corrosion protection

There are a lot of closed cells in foamed concrete, and the thermal inertia of air relative to other materials greatly reduces the thermal conductivity of foamed concrete. Therefore, in the field of energy saving, foamed concrete is often used as thermal insulation material. Foamed concrete is a kind of portland cement product with excellent durability and corrosion resistance. Thermal insulation, anti-freezing and anti-corrosion, effectively extending the service life of the structure.

Because foam concrete is convenient for construction, heat preservation and fire prevention, the laid pipeline is backfilled with foam concrete, and its high fluidity is used to wrap the outside of the pipeline and keep the temperature, which has good compressive strength and aging resistance. The compressive strength and aging resistance of traditional organic thermal insulation materials are poor, and the compressive strength of foam concrete blocks can reach above 7.5MPa, which can improve the stability and life of thermal insulation layer.

2. High fluidity and low filling pressure

Because foam concrete does not contain coarse aggregate of cement concrete, its fluidity is much higher than that of cement concrete (when the water-cement ratio is 0.5, the fluidity value is about 180mm), and it has the characteristics of self-leveling in construction; In actual construction, hose can be used for pumping: the horizontal pumping distance can reach 900 meters.

Abandoned mines, pits, oil tanks, pipelines (containing crude oil and chemicals), sewage pipes and other cavities are easy to cause fires or landslides. Backfilling with foam concrete can solve these problems at low cost. The density of foamed concrete depends on the pipe diameter and groundwater level, and is generally 500 ~ 1 100 kg/m3.

3, filling self-compacting

Because the production point of foam concrete can be separated from the site construction pouring point, and the pouring point occupies a very small construction space, it can be constructed in a narrow space; Combined with the characteristics of self-leveling of foam concrete, it is self-compacting by filling, without vibration and rolling, and the construction is convenient and efficient. It is an excellent material for filling narrow spaces and underground caves.

4. Adjustable density and strength

By adjusting the content of bubbles in foamed concrete, the dry density of foamed concrete can be controlled between 300 ~ 1200 kg/m3, and the control strength can be adjusted between 0.3 ~ 5 MPa (the main application range of strength in engineering is 0.3 ~ 1.3~5Mpa).

5. Compressible and low elastic earthquake resistance:

Creep deformation will still occur after deep-buried tunnel construction, which is easy to damage the structure due to excessive deformation pressure. Because of its high compressibility and good ductility, foam concrete will not be destroyed after large deformation. Foam concrete is used as filling material in the pipeline at the intersection of pipeline and road, which can bear and absorb deformation pressure and improve the structural stress.

When the earthquake occurs, the density of foam concrete is low and the horizontal inertia force is small; At the same time, the foam concrete has low elastic modulus, good impact energy absorption performance, good cushioning characteristics for the pipeline and protection of the pipeline body from earthquake damage.

6. persistence

Foamed concrete is a kind of cement material, which has the same service life and excellent durability as cement concrete.

7, superior environmental protection characteristics

Foamed concrete has no pollution to natural environment such as soil, water and air. At the same time, the application of foam concrete in filling engineering construction can avoid the damage to the environment such as high filling and high excavation, which is of great significance to the protection of natural ecological environment and has obvious environmental protection advantages.