Shandong Sheng Machinery Co., Ltd. has many years of sub-cement pipe and cement pipe mold manufacturing experience, in recent years, developed a variety of pre-cement products processing equipment and building materials machinery and equipment.

The collapse of the large diameter roller tube hanging in the production of quality problems prevalent in the steel skeleton deformation under control and protective layers thick case of obvious, if the cohesion of concrete is significantly less than the upper die weight of concrete and reinforced resilience in a very short downtime occurs roller pressure and centrifugal force lost after the collapse; If the concrete has a greater cohesion, but in the upper die weight of concrete and reinforced the role of resilience under creep speed is still faster, deformation after the increases to a certain value, and self-adhesion of concrete and steel arch weakened, the collapse will occur (this generally occurs when at rest stops and heating).

    Hanging roller cement pipe machine is a dry hard concrete material, after forming with high initial strength, so the rheological properties similar to Maxwell model, namely the series by elastic element and viscous components together (Figure 1). At the moment of the external force, the first elastic deformation, with the external force to extend the time t increases viscous flow v, that is v = tt / n. Thus, the protective layer thicker concrete and reinforced cohesion and adhesion of the hour, force t, the more easily the collapse; while the greater water-cement ratio and cement hydration slow, viscosity coefficient n is small, it is easy to the collapse. Collapse prominent reason is that the winter hydration is slow, resulting in concrete and reinforced cohesion and adhesion of small, n value is low.

     This paper tries to plasticizing functional application compacting agent to make concrete with an appropriate degree work at low water-cement ratio, high compactness, better visual quality; compacting agent after the plasticizing effect of the use of the limited time that the molding concrete restore its special dry hard, has a high initial strength, cohesion and adhesion with the steel, thereby reducing the force and increase the viscosity coefficient, thus preventing the collapse.

One, hanging roller compacting agent performance

The agent for the powder, a surfactant composition has a special function, the dosage of 0.3 to 0.5% by weight of cement, concrete mixture with improved work, increase cohesion, improve the density and prevent the collapse and improve steam raising the intensity of other functions.

An impact on the degree of work, compacting agent for dry concrete has good plasticizing effect. Seen from Figure 2, doped with 0.25 to 0.5% of the compacting agent, the dry hard concrete work degree from 50 seconds down to 30 to 20 seconds, or 35 seconds down by about 20 seconds (low plasticity concrete). This is due to the compacting agent for cement paste with adsorption dispersion, lubrication and wetting action's sake. Mixed concrete compacting agent mixture while maintaining the physical and mechanical properties of dry hard concrete and has a certain plasticity, which is suspended roller forming process desired. Compacting agent doped up to the following effect, cloth uniform thickness, steel skeleton deformation is small, easy to roll when a slurry, wall smooth, dense and uniform die once impermeability pass rate increase.

2, the plasticizing effect of aging

Compacting agent for dry hard concrete plasticizing effect for how long? That could end when the suspended roller molding plasticizing effect is lost, restoring its dry hard? Be seen from Figure 3a, the material hardens doped faster compacting agent, the work of 10 seconds and 20 seconds parked softer material of 30 to 60 minutes after the work has been 35 to 45 seconds dry-hard materials; compacting agent is not mixed with softer material (Figure 3 1,5 curve) park still soft after 30 to 60 minutes, so mixed concrete compacting agent, although relatively soft material, not after forming the collapse; not doped compacting agent softer material, often after shutdown appear in the collapse. Compacting agent content of 0.3 to 0.5 percent is appropriate, if the content too (Figure 3 curve 4 dosage of 1%) the plasticizing effect of time is too long, you can not restore it dry hard.

Hanging roller cement pipe machine production process, the material from the concrete mixer through transportation, fabrics and molding, the cycle is generally 15 to 20 minutes (no more than half an hour). Be seen from Figure 3b, the work of the compacting agent mixed sand around the material 20, 20 to 30 minutes is still parked more suitable workability, parking harden rapidly after 40 minutes.

      Shandong Sheng Machinery Co., Ltd has been committed cement products machinery research and development, production and sales, with advanced equipment, professional and technical skills, and two decades of practical experience, the company has always been at the forefront of research and development center block making machine market development , concerned about the advanced technology at home and abroad, to develop products for the investment needs of different users, there are block making machine, hydraulic tile machine, cement pipe machine, blender, suspended roller machine, wire rod machine equipment. Currently has 19 branch offices and six foreign countries (Nigeria, Tanzania, Algeria, Kenya, Mozambique, Ethiopia) and exported more than 100 countries and regions.