Using the method of steel fiber

Steel fiber concrete ratio

General engineering mix:

Construction technical requirements:

The 1 grade of cement, cement ratio shall not be less than 425, shall not be greater than 0.5.

2 thick bone particles diameter length should not exceed the length of steel fiber 2/3.

Steel fiber volume 3 steel fiber concrete shall not be less than 0.5%, select general in 0.5 – 2%.

4 mixing of steel fiber concrete shall not use sea water, sand, it is strictly prohibited to miserable chlorination salts.

5 in addition to the above, other materials used for steel fiber reinforced concrete, should be consistent with the provisions in the current specification for reinforced concrete raw materials used.

6 steel fiber concrete consistency can participate in the similar engineering required for ordinary concreteconsistency to determine, the slump value may require small 20mm than the corresponding value of ordinary concrete, its Vebe consistometer value value is the same as the corresponding ordinary concrete requirements.

The 7 contraction joints for flat joint structure of steel fiber concrete layer and the surface layer of cushion not shop in lime soil foundation strengthening and also meet the following conditions: 1, and reduce the front cushion layer and the surface layer thickness of not less than 130cm; the 2 foundation strengthening layer thickness is larger than the thickness of the cushion, the thickness can grasp to remove the reduction coefficient of 0.75, butshall not be less than 50cm.

Feeding requirements:

1 now the steel fiber and coarse aggregate into mixing with 30 seconds, so that the steel fiber dispersion in the stone, not unity.

2 then sand and cement into the mixer dry stir for 30 seconds.

3 then in the rotation mixer in the water, and then stirred for 3 minutes.

Compaction: steel fiber reinforced concrete, with the mix with the use, continuous pouring, not to the joint shall not be dumped construction joints of lattices, pouring should be vibration compacting.

Plaster embossing: steel fiber concrete has a set of coarse material, sand ratio, fiber random distributioncharacteristics. The use of mechanical troweling, prevent fiber exposure. The embossing device process should also to avoid napping produce fiber exposure phenomenon. After 24 hours, should according to the conventionaltimely maintenance, application of straw bag like cover cold summer, attention should be paid to thermal insulation.

Steel fiber use — mixing is the key

Steel fiber products in use process, mixing is a very important part of the decision, all physical end of steel fiber reinforced concrete properties. Therefore, we must take the scientific way of mixing to maximum depth of play tothe properties of steel fiber reinforced concrete, so as to achieve and exceed the design requirements. The use ofsteel fibres in general, no external to the manual mixing machine mixing, two. Manual mixing in general repair engineering of small, square concrete quantity is not always too much. So, as long as the general tried to mix steelfiber and concrete completely uniform. (the specific operation and avoid: sand, stone, cement, steel fiber must first dry mix completely uniform plus the amount of water, otherwise it is difficult to mix) and the need to add steel fiber in the process of mechanical mixing of concrete

Products. Mixing can be carried out in the following order:

1 the general mixing station is big is small, but the basic function is the same, so the steel fiber into programs to be basically the same.

2 in the transmission belt, generally to pass into the hopper is dry sand, stone, designed according to theproportion to pass into the mixing bucket.

3 in the dry material adding proper amount of steel fiber (adding quantity of steel fiber according to the design requirements, see the use ratio).

4, when the sand, stone, steel fiber are poured into the hopper, can dry mix (do not add water), general dry stir for a minute to two minutes.

5, and water (the amount of water) for concrete mixing (please note the admixture of water not excessive,otherwise easy to agglomerate steel fiber)

Loading of steel fiber cement concrete, 6 will be a good mixing, can be transported to the construction site, usethe.

7 paving process can use large machinery, can also manually pavement, the pavement with ordinary concrete in the same.

8 pavement after compaction by vibrating compactor is required, leaving no bubbles or blisters, really want toensure concrete.

9 at the end of the concrete surface smooth, artificial and mechanical can. Be careful not to steel fibers exposed to the surface.