All About Ready Mix Concrete

RMC or ready mix concrete is a concrete, a mixture of fine sand, water, Portland cement, and coarse aggregates. It is manufactured in the cement factory or batched plant instead of mixing at the construction site. A specific proportion of the material is required to prepare this mixture. Once the mixture is ready, it transported in the transit mixer to the worksite. A cylindrical truck which is known as cement mixer is used to carry the concrete mixture.

The ready-mix concrete prepared is durable and sustainable. It is eco-friendly as it is prepared in a close chamber that reduces noise and air pollution. Further, a durable structure is obtained as it increases the service life. In this article, we will discuss various types of ready mix concrete and its advantage as well as disadvantage.

Concrete Batching Plant ATP 45 and ATP 60

Types of ready-mix concrete

There are three types of RMC, that is made depending on the various material used during mixing.

  • Transit mixed concrete
  • Shrink mixed concrete
  • Central mixed concrete
  1. Transit mixed concrete

Transit mixed is also known as truck mixed concrete where materials are batched at a central plant and then mixed thoroughly in the truck during transit. It separates water from the cement and aggregate, and then the mixture is finally mixed at the site. The mixing of concrete at the site avoids the problem of premature hardening and slump loss that results in a delay in transportation. One significant disadvantage of transit mixed concrete is that the capacity of the truck is smaller.

  1. Shrink-mixed concrete

Shrink mixed concrete or ready-mix concrete enhances the load capacity of the truck where concrete is partially mixed at the plant to reduce the volume of the mixture. The balance mixing is completed in the truck during the transit or at the worksite.

  1. Central-mixed concrete

It is also known as the central batching plant where the mixture is properly mixed before loading into the truck mixer. It is also known as wet batch plants or pre-mix plants. The advantages of a wet batch plant are of better quality and consistency.

Advantages of ready-mix concrete

Till now we have read types and what RMC is, here we will discuss about the advantages of it.

  • The concrete produced is of better quality as it made of specific proportion and advanced equipment is used.
  • Storage of material at the construction site is not required.
  • Reduces labor cost
  • Reduces air and noise pollution at the site
  • Environment friendly
  • RMC avoids delay and construction work is completed on time
  • Wastage of material at the worksite is avoided.
  • The practice of proper mixing of the cement will reduce the consumption of the cement
  • Ready-mix concrete saves the use of cement as bulk concrete is used instead of cement bags
  • The concrete is delivered on time at the worksite whether the quantity is large or small

Ready-mix Concrete – Limitations

  • It requires a large amount to be invested initially
  • RMC is not suitable for a small project
  • To avoid interruption in work effective transportation system is required that will carry the mixture from the plant area to the job site.
  • As the truck reaches should be ready at the site to start working immediately to avoid slumps in the mixture.
  • The mixture must be used within the time frame that is 210 minutes from the transit of the plant. In case if the vehicle is stuck in traffic or some other problem has arisen then it would create a problem.

All About Ready Mix Concrete

Working Principle of Concrete Pipe Making Machine

There are lots of types of pipes for different purposes. These include asbestos pipe, concrete pipes, galvanized steel pipes, cast iron pipes, PVC pipes, HDPE pipes, and many more.

The concrete pipe frequently referred to as reinforced concrete, is one of the strongest material compositions. There are lots of benefit for making use of RCC pipes; they are robust, long-lasting and of excellent quality.

The RCC pipe (reinforced concrete cement pipes) is also called RCC- Hume pipe, as it was invented by the Australian inventor Walter Reginald Hume.

It’s applicable in many ways and is therefore widely used for sewage and rainwater drainage and also culverts.

They are beneficial because environmental factors don’t influence them, they don’t rust, bend or burn, and they have a strong structure, which allows the flow of large quantities of water and are inexpensive.

Concrete Pipe Making Machine

Categories of Reinforced Concrete Pipe Making Machine

Centrifugal, vertical extruding, hanging roller concrete pipe-making machines

Vertical Extruding Concrete Pipe Making Machine

The operational principle of this machine is that formation of the concrete is by extrusion method.

The cement pipe produced by this machine is generally utilized in urban housing, development of townships and rural area, sewerage and use of small bridges.

Centrifugal Concrete Pipe Making Machine

The functioning principle: the pipe pass on for fast operation in the concrete’s mould under the centrifugal force’s activity, beside the internal wall circulation of the mandrels to develop a tubular.

Production specifications: creation length 1000-4000mm, internal width 200-1200 mm various types of flat orifices, clusters, bearing socket etc. for many types of cement pipe. Generally utilized in high-class requirements of deep wells, community sewerage, public road and others.

Hanging Roller Concrete Pipe Making Machine

The operating principle: the utilization of the roller shaft uphold bender and the pipe in the roller pressure’s mould.

The roller shaft propels the mandrel to be driven at high speed, the cement inside the bender is conveyed in the pipe’s internal wall under centrifugal force activity.

When the internal concrete is driven to pivot by the tube mould via the roller shaft, the cement between the pipe die and roller shaft is compressed to create a pipe.

How Does the Concrete Pipe Making Machine Work?

The most common method of producing concrete pipes is the Hume-Spun pipe process, but alternative approaches are now available.

Because the production-process involves cage spinning during concreting, it is also called the Spun pipe. The concrete is manually poured, and cages are prepared for insertion into the mould, depending on the pipe’s size.

Here are some steps to explain how the concrete pipe making machine:

Raw Material: The raw-material is automatically removed from the stockpile or fed manually.

Making of moulds: The moulds are prepared before use by making them clean and ensuring the cage’s centering. They are also lubricated with brushes correctly.

Concrete mixing: The ideal mix-design is made to ensure that all essential material such as water & cement is made use of according to the weight and prepared for proper mixing. It’s important to get the mixture processed within 30 minutes, thereby ensuring resilient strength of the concrete pipes.

The spinning of the mould: The mould is set on the runner using a chain pulley. This initial piece is carried gently. The casting of the mixture is done with appropriate care and at a slow speed.

The rest of the process, however, is done at a faster rate.

Demoulding: This process is carried out using chain pulleys and involves the separation of the moulds.

Curing: This procedure is a chemical process to make the polymer material tough by cross-linking the polymer chains successfully.

It’s important that all concrete pipes are cured in a mould to thereby making sure they’re strengthened.

Working Principle of Concrete Pipe Making Machine

Block & Pipe Making Machines Designs That Have Dominated the Industry

The concrete blocks are manufactured either through manual method or with the use of block making machine. Manual manufacturing method involves concrete moulds kept in a row and concrete is poured and compacted in the mould with a vibrator. Over time this method has been seen to be slow for mass production of blocks and this led to the development of the block making machines.
This machine has a replaceable gang mould system that can produce many blocks at the same time. The quality of the blocks shows that they are superior in strength and have a better finish due to better control of equipment during the compaction phase of the process.

Concrete Block Making Machine

Critical Design Parameters for the Block Making Machines
Achieving the right compaction of a concrete block is an important criteria affecting the block quality and resulting strength. The compaction of a mould depends on the frequency, amplitude and duration of vibration.  In essence, ready mix concrete with coarse aggregate requires a lower frequency of vibration and higher amplitude while that of finer fractions will require higher frequency and lower amplitude.

Design Features

  • The equipment may be equipped trolley wheels, with the front pairs connected to a steering system for easier movement from one point to another.
  • Incorporation of a horizontal power shaft connected to an electric motor through a v-belt system and pulleys for off loading the completed blocks.
  • Moulding section is equipped with several slots/ cavities to enables machine deliver more than one block per cycle.
  • Fitting pads have been equipped with built in with vibration isolating devices that help confine the vibrations to the mould block.
  • With these salient features, an output of more than 150 blocks per hour can be achieved with better compaction and strength.

Pipe Making Machines Design Features
The concrete pipe making machine is another important product from the Apollo Infratech company. The development of the vertical cast process for manufacturing of concrete pipes has proved very efficient and cost effective. It has also proven to be the best automation technique requiring lesser labor force while achieving faster production, consistency and higher quality of product.

Some of the important innovations that will enhance the efficiency of the machine and improve production include;

  • Automated swivel arm operation and the concrete feeder
  • Hydraulic press / rocking functionality
  • Stationary control panel
  • Pneumatic system for casting of lined pipes
  • Elevation and cooling system for the vibrator
  • Double and triple casting stations for greater output per cycle
  • Hydraulic vibrator, with a modern frequency control system.

The incorporation of these innovative features in the pipe making machine makes the equipment extremely versatile and efficient, able to manufacture long lasting concrete pipes, culverts, manhole systems, reinforced and non-reinforced concrete pipes, non-circular pipes, manhole risers and many other related products. These machines are able effectively utilize the ready mix concrete with reduced wastage, leading to profitable operations.

Concrete Solutions with Concrete Equipments, Spun Pipe

Concrete Solutions with Concrete Equipments

Fast infrastructure development needs high end concrete equipments for mixing and preparing concrete solutions. Concrete mixer that is also known as transit mixer is one of the widely used concrete equipments for construction that not only mixing the concrete materials well but also transporting the same to the development site. The homogeneous concrete solution is prepared in the truck mounted unit is called as transit mixer. Sometimes the transit mixer is attached as trolley to the tractor or other vehicle. Continuous rolling drum mixing the aggregates thoroughly to make the mixer uniform. The truck mounted concrete mixers are categorized in two ways. One is traditional transit mixer where the rolling drum is mounted on back of the truck and need to place truck at the position to place the concrete solution at right place. This type of transit mixer is used for preparing small amount of construction solution for small projects. But second type of transit mixer is at front side to make the movement of rolling drum in any direction with the guiding remote in the cab of the truck. This way chute can be moved in any direction to place the concrete without placing the truck properly. This one is the advanced concrete machinery solutions to make the work easily and fast.

Spun Pipe

Spun Pipe is a known traditional way of making RCC pipe. Spun pipe making machine is conventional machine invented before two decades by the Australian scientist named Walter Reginald Hume. Based on his name, spun pipe is also popularly known as Hume pipe in construction industry. Now days instead of these traditional pipe making machines, advanced technological process of vertical cast, have been utilized for speedy and high quality, strong concrete pipes. Vertical cast is more automated and trust worth process to create the concrete pipes than spun pipe. Still this process has been used in many countries where labor is cheap and resources are more to handle the process. Industrial construction needs the equipments with modern features to speed up processes with quality works to handle the complex construction tasks with varieties of concrete equipments like concrete batching plant, mounted concrete pump, shotcrete machine and pre-cast applications etc. for further details and technical specification for concrete machinery equipments and building construction solutions, visit – www.apolloinfratech.com

Apollo Infratech – Supplying Concrete Pipes Manufacturing Machines in Indian Market

Apollo Infratech believes that change is the need of the time and so it has joined hands with world’s leading vertical cast pipe machine manufacturer HawkeyePedershaab Concrete Technologies Worldwide and formed a company named Apollo Hawkeye Pedershaab concrete Technologies Pvt. Ltd. This company will be manufacturing concrete pipe manufacturing machines of international standards. These concrete pipe manufacturing machines are also known as RCC pipe manufacturing machines (Reinforced Concrete Cement Pipe manufacturing machines). This joint venture of Apollo Infratech has enabled the company to provide international standard machineries in Indian market at a very competitive rate. In this way, the company has also contributed to the economic growth of the country in infrastructure development.

CAP 150 – Vertical Cast Concrete Pipe Machine

This concrete pipe making machine can enable versatile production of pipe, culverts and complete manhole systems of up to 1500 mm (60”) in diameter for circular units and up to 1500 X 1500 mm (60” X 60”) for square units. This machine will be made in India by Apollo Infratech under the license from HawkeyePedershaab and will be launched in April 2012. This vertical cast concrete pipe machine is manually operated machine and can manufacture high quality concrete pipe, box culverts and complete manhole systems which include reinforced and non-reinforced pipe, circular and non-circular pipe with “bell” or in-wall joint, lined pipe, jacking pipe, box culverts, manhole risers, cones, base sections and cover slabs.

Various optional features can be installed in this concrete pipe machine in order to improve production and handle the machine easily, which are Swivel automation for swivel arm and concrete feeder, including pendant switch for operation of concrete feeder, vibrator and swivel arm, stationery control panel, hydraulic pressing/rocking function, R4 headers, top ring system, lifting hole equipment, reinforcement centering equipment, pneumatic equipment for casting of lined pipe, elevating system, cooling system for the vibrator, double and triple casting stations, hydraulic vibrator and frequency controlled vibrator speed.

This concrete pipe making machine is versatile which enables table vibration or central core vibration and has Falcon control. It is designed with the state-of-the-art components making it suitable for all types of concrete pipes of different shapes and sizes. The capacity of this machine depends on the kind of concrete pipe being produced, the material used and the local conditions. With the help of this machine all concrete pipes and manhole systems are manufactured with an inner lining of PVC, PE or GRP with special mold attachments. This versatile concrete pipe manufacturing plant comes with a special feature of manufacturing more than one pipe diameter per production day due to its build in system for quick mold changes down to 15-30 minutes. This machine is manually operated by 1-2 workers which also depend on the specific products being manufactured, layout of the machine and selected optional features.

So, now by launching this versatile concrete pipe making machine, Apollo Infratech is going to bring a new revolution in concrete pipe manufacturing industry.