Bubbles of lightweight soil roadbed filling, the abutment back fill, high-speed road widening and construction, the application of air bubbles of lightweight soil is also called the bubble concrete or light foam concrete, through the bubble machine of foaming system will be fully foaming in mechanical way, foaming agent and foam slurry mixing with water, and then after a foaming machine of cast-in-place construction of the pumping system or molding, formed by the natural curing a new lightweight thermal insulation material contains a lot of closed porosity.
It is an air-bubble insulator, which is characterized by the forming of closed foam holes inside the concrete, which makes the concrete light and heat insulation.
The Characteristics:
1) light quality: the dry bulk density is 300-1600kg/M3, equivalent to 1/5 ~ 1/8 of ordinary cement concrete, which can reduce the overall load of the building.
2) integrity: the construction of on-site pouring can be closely combined with the main body, without the need to keep the boundary between the joints and the vent pipe.
3) low elastic damping: the porosity of the mixed light soil makes it have a low elastic modulus, so that it has a good absorption and dispersion effect on the impact load.
4) compressive strength: the compressive strength is 0.6-30.0 MPA.
5) water resistance: the water bubble mixture is relatively small in water absorption, relatively independent of the enclosed bubble and good wholeness, so that it has certain waterproofing properties.
6) durability: same as the main project life.
7) speed of construction: only simple machines can be used to realize automatic operation, which can be delivered at a distance of 300 meters, with a workload of 150-300m3 / working days.
8) environmental protection: the raw materials needed for air bubble mixing light soil are cement and foaming agent, and the foaming agent is neutral, without benzene, formaldehyde and other harmful substances, avoiding environmental pollution and fire hazard.
9) economy: low comprehensive cost.
Ii. Application scope
(1) used as retaining wall. A rock wall mainly used as a port. After the bank wall is used as lightweight backfill material can reduce the vertical load, and also reduce the lateral load of the wall. This is because he is a rigid body with good bond performance. It does not exert lateral pressure on the wall around the perimeter, the settlement is reduced and maintenance costs are reduced, thus saving a lot of expenses. Bubble concrete can also be used to improve the stability of embankment slope and replace the soil of the slope with it, which reduces the effect of the slope stability by reducing the quality.
(2) build sports ground and track and field runway. The use of high - drained and permeable foam concrete is used as a light base and covered with gravel or artificial turf as a playground. Bubble concrete has a density of 800-900kg/m cubed and can be used for hockey, football and tennis. Or you can build a layer of porous asphalt and a layer of plastic with a thickness of 0.05 m, which can be used as a track and field runway.
(3) make the core member. Bubble concrete can be used as the inner core in precast reinforced concrete member, so that it has good performance of light high heat insulation. Foam concrete usually has a density of 400-600kg/m cubed.
(4) the pipeline backfill. Within underground waste oil tank, pipeline (crude oil, chemicals), sewage pipe and other holes is easy to cause fire or landslides, the bubble concrete backfill can solve these future trouble, less cost. The density of bubble concrete depends on the diameter of the tube and the water table, which is generally 600-1100kg/m cubed.
(5) poor concrete filling. Because of the flexible hose, the bubble concrete has a great degree of work and adaptability, so it is often used in poor concrete filling. If the requirements of heat insulation are not high, the average thickness of the poor concrete with a density of 1200kg/m cubed is 0.05 m. If the heat resistance requirement is high, the average thickness of the poor concrete with a density of 500kg/m is 0.1-0.2m.
(6) roof slope. Bubble concrete is used for roof slope, which has the advantages of light weight, fast construction speed and low price. The slope is usually 10mm/m. The thickness is 0.03-0.2m, and the density is 800-1200kg/m cubed bubble concrete.
(7) the support of the bottom of the tank. Foam concrete pouring order at steel storage tanks (crude oil, chemicals) installed inside the bottom of the foot, when necessary, also can form a convex foundation, this ensures that the whole of the bottom support in welding at the age of the best stress state, the continuous support can make the tank with the bottom plate. The convex foundation is also easy to clean. The density of bubble concrete is 800-1000kg/m cubed.
(8) used for landscaping. The foam concrete can be used for the weight of 600-1000kg/m cubed, which can be used for garden rockery, dustbin, table stool and so on.
(9) defense (modern warfare is to use information and advanced mobile equipment for attacking tools), the bubble of concrete can be used in military engineering such as the airport has been damaged by the enemy bombing, important implement immediately repair, such as traffic roads with our equipment and technology to destroy the enemy quickly repair engineering, the experiment of the result is 10 minutes after repair can be used for aircraft take-off and landing, chariot through.
(10) application of freeways to relieve load or earth pressure.
1) the problem of the settlement of engineering settlement that is not sufficient to solve the preloading of the soft base section is effectively solved by the backroadbed of the new highway bridge.
2) the bridge deck backroadbed reconstructed by the old road can solve the problem of the bridgehead jump caused by the settlement of the post-work settlement at one time.
3) the widening of the roadbed in the road expansion can better solve the problem of deformation of the old and new roadbed, and can save land expropriation and avoid demolition.
4) the roadbed in the steep section of the mountainous area will avoid the construction technical difficulties caused by high filling and excavation.
5) the overburden reduction of the underground large-span structure project.
Self-leveling character
1) ignorant and narrow space filling.
2) the empty area, the lava area, the building foundation pit, the hole formed by the collapse of the tunnel and the surrounding space of the underground pipeline.
