Bubble mixed light soil (light) foam concrete filling is used special machine will be made of foam, foaming agent and foam slurry and cement materials mixed into foam slurry, through good or mechanical pump to send casting to foundation pit excavation base trough, the dry solid, curing and become porous lightweight concrete material.

  It is characterized by the formation of foam holes in concrete and the lightweight and functional properties of heavy cement concrete, which is one of the most functional inorganic light materials to date. At present, light - quality foam concrete is known in China as: foam light soil, bubble mixture light soil, bubble light soil and other names.

  Lightweight foam concrete materials of light, the intensity of the availability of regulatory independence, high liquidity, after curing, good workability, durability, good heat insulation, sound insulation effect and freezing-thawing resisting performance, and many other advantages, in the process of the infrastructure used in road subgrade, vertical lift, load reducing filling in soft clay, fill, fill, bridge bridge abutment back filling, bridge load reducing filling, high speed of sound insulation, and other fields, can effectively reduce the high fill section, tunnels, underground continuous channels such as backfill load, reduce the ground stress and decrease differential settlement of foundation, impact energy absorption pavement, effectively solve the soft embankment of vehicle dumpping, road widening embankment thermal insulation and cold areas, increase the stability and safety coefficient of engineering. It can also reduce project cost and reduce maintenance costs.

  Japanese light foam concrete (FCB) technology has been applied in the light filling field of construction engineering for many years, which has solved a lot of technical problems for the construction of basic construction. 

However, in recent years, China has successfully applied foam concrete to several projects through extensive research and application of technology.

In the application of light-weight filling project, lightweight foam concrete mainly embodies the following characteristics:

1. Light quality:

The core of the application of light quality is to reduce the load, reduce the load and reduce the settlement and uneven settlement. Traditional filler material often turns the soil and concrete, its weight is bigger, prone to settlement, other structural layer can cause joint in engineering quality problem, through lightweight foam concrete load reduction can meet the design requirements;

2. Self-reliance:

The self-reliance of solidification means that the light foam concrete can be added vertically, and its vertical plane side pressure is zero. According to the properties of independence of lightweight foam concrete, foam concrete can be used for road subgrade, if the road to the substrate layer is soft, directly on the soft base construction, construction completion after Louis appear cracking down phenomenon, if the foam concrete replacement soft base, which can effectively avoid this kind of phenomenon.

3. Strength characteristics:

In filling engineering applications, the apparent density of lightweight foam concrete can be controlled between 300 ~ 1600 kg/m3, intensity range generally from 0.3 to 0.3 MPa, within the scope of the strength, on the one hand, foam concrete pouring construction easy, on the other hand can be solidified self-reliance, and meet the design requirement for strength.

4. Self-leveling characteristics:

The light foam concrete slurry has the liquidity, the construction with the base level is good, there will not be empty drum and empty phenomenon.

5. Quick construction speed:

Light foam concrete construction adopts professional foam concrete production equipment, automatic production, quick construction speed, saving labor and shortening construction period.

Main performance indexes of lightweight foam concrete filling materials:

The dry density and thermal conductivity of light foam concrete

Dry density level m3 dry apparent density is less than or less than kg/m3 thermal conductivity is less than W/(m • k)

A03 0.08 300

A04 0.10 400

A05 0.12 500

A06 0.14 600

A07 0.18 700

A08 0.21 800

A09 0.24 900

A10 0.27 1000

A12 1200 --

A14 1400 --

A16 1600 --

Note: the dry apparent density should not be greater than the index specified in the table. The allowable error should be + 5%.

Light foam concrete strength grade

The average value of each group of intensity MPa is greater than or equal to the minimum value of a single block

C0.3 0.30 0.225

C0.5 0.50 0.425

C1 1.00 0.850

C2 2.00 1.700

C3 3.00 2.550

C4 4.00 3.400

C5 5.00 4.250

C7.5 7.50 6.375

Application scope of lightweight foam concrete:

The lightweight material reduces the load and fills the foundation pit to fill the bridge of the soft foundation

The application of road, railway, high speed and high railway base foam concrete in backfill grouting

Subway-tunnel subtraction, subsurface continuous channel reduction backfill