Lean concrete is a mixture of coarse and fine graded aggregate, cement and water. The cement content of this kind of concrete is lower than that of ordinary concrete, and compared with semi-rigid materials such as cement stabilized macadam and lime-fly ash macadam, it has higher strength, rigidity and integrity, and has good anti-scouring, anti-freezing and anti-fatigue properties.

Plain concrete: an important part of reinforced concrete, which consists of cement, sand (fine aggregate), stone (coarse aggregate) and additives. , mixed according to a certain proportion, and mixed with a certain proportion of water.

2. Different application fields

There are different names because of different application fields. The underground part of building engineering generally adopts plain concrete, and the structural part is called cushion; Lean concrete is usually used in road base, which bears the repeated action of vehicle load and temperature load together with the surface layer.

Extended data

pay attention to

When the lean concrete base needs to be slit, it should be slit about 20 h after paving, with the slit depth of 1/3 h ~ 1/4 h and the width of about 6 mm, and it should be operated by professionals to prevent the slit from being straight and dislocated. The incision should be impervious, generally using geotextile or glass fiber. After each section of grass-roots rolling is completed and passed the inspection, health preservation shall be started immediately.

Moisturizing geotextile is generally used for the maintenance of lean concrete base, and anti-seepage materials such as plastic film and curing agent can also be used. Traffic should be closed during health maintenance, and the number of sprinklers depends on the weather. In order to maintain moderate humidity, sprinklers should be sprinkled at least twice a day. The curing period depends on the specific situation, and generally takes about 2 weeks. Special attention should be paid to the maintenance of the first 7 days to prevent or reduce cracks.