This agent is the national academy of sciences and coal science research institute jointly developed the latest products. It is a kind of powder concrete, mortar admixtures, quick-setting rapid hardening of cement, mixed with suitable amount of accelerator of net cement slurry can quickly condense sclerosis, have higher early strength and increasing the later strength, and can keep the other properties of cement. Accelerator can be used in sprayed concrete and mortar engineering. It is used in national defense, railway, metallurgy, coal, hydropower and other departments of the underground engineering and tunnel engineering, rock excavation and lining support after seam mining. Compared with ordinary pouring concrete support, to speed up the construction speed, to reduce the engineering cost. J85 accelerator by national identification, product performance and comprehensive technical and economic effect, are better than others

The main technical indicators and performance characteristics:
1, the appropriate mix content water cement ratio 0.4 under normal temperature, can make the net cement slurry initial setting in 3 minutes, 10 minutes final set.
2, the early strength of cement stone (one day) don't mix of 2-3 times, 28 days compressive strength increase by about 10% compared with domestic other accelerator.
3, sprayed concrete rebound quantity is little, hardened concrete volume change is small, the decrease of strength of concrete in the late little, alkaline small, small corrosion to the human body, at the beginning of final setting time interval is short.

Transportation and storage:
1, the accelerator has a strong hygroscopicity, will have to fight to be affected with damp be affected with damp. Therefore, accelerating agent packed in sealed plastic bags, plus a layer of woven bags, bags of 25 kg net each.
2, in the process of transportation, to should take put down gently, prevent to tear, invalidate accelerator be affected with damp be affected with damp.
3, hardener should be stored in dry warehouse, shall be properly kept, and not to be affected with damp be affected with damp, can use for a long time.

Use method and matters needing attention:
1, when used according to determine the appropriate mix content (usually is 3-5%) the weight of the cement mixed with. The sprayed concrete adding method is first and then add two: the former is the accelerator dry mix with cement, sand, gravel, and then to the injection machine for injection; The latter is to add hardener evenly on the feeding belt, together with the mixture to join in the jet pipe, or adding accelerator evenly directly within the jet injection. Stop every time as short as possible, avoid accelerating absorption of moisture in aggregate, causing condensation in advance, affect the quality of the project.

2,Accelerating agents for a variety of cement has good adaptability, but still need to determine before use of cement quick-setting effect. The best cement varieties to select adaptive performance. Appropriate USES fresh cement has not be affected with damp be affected with damp, in order to achieve the best effect of condensation