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What does a low-investmen...
Forum: Earth moving machinery
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How much does a concrete ...
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Stationary concrete batch...
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What Is a Concrete Mixer ...
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Some knowleage about oper...
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How to prevent the concre...
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concrete tractor pump, co...
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11-04-2024, 07:19 AM
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| What is concrete mixer in construction? |
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Posted by: concretemixer - 09-15-2022, 12:45 AM - Forum: concrete machinery
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A concrete mixer (often colloquially called a cement mixer) is a device that homogeneously combines cement, aggregate such as sand or gravel, and water to form concrete. A typical concrete mixer uses a revolving drum to mix the components. For smaller volume works, portable concrete mixers are often used so that the concrete can be made at the construction site, giving the workers ample time to use the concrete before it hardens. An alternative to a machine is mixing concrete by hand. This is usually done in a wheelbarrow; however, several companies have recently begun to sell modified tarps for this purpose.
Today's market increasingly requires consistent homogeneity and short mixing times for the industrial production of ready-mix concrete, and more so for precast/prestressed concrete. This has resulted in refinement of mixing technologies for concrete production. Different styles of stationary mixers have been developed, each with its own inherent strengths targeting different parts of the concrete production market. The most common mixers used today fall into three categories:
Twin shaft concrete mixer for a concrete plant
Twin-shaft mixers, known for their high intensity mixing, and short mixing times. These mixers are typically used for high strength concrete, RCC and SCC, typically in batches of 2–6 m3 (2.6–7.8 cu yd).
Vertical axis mixers, most commonly used for precast and prestressed concrete. This style of mixer cleans well between batches, and is favoured for coloured concrete, smaller batches (typically 0.75–3 m3 or 0.98–3.92 cu yd), and multiple discharge points. Within this category, the pan mixers are losing popularity to the more efficient planetary (or counter-current) mixers,[3] as the additional mixing action helps in production of more critical concrete mixes (colour consistency, SCC, etc.).
Drum mixers (reversing drum mixer and tilting drum mixers), used where large volumes (batch sizes of 3–9 m3 or 3.9–11.8 cu yd) are being produced. This type of mixer is capable of high production outputs.
All the mixer styles have their own inherent strengths and weaknesses, and all are used throughout the world to varying degrees of popularity.
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| Why is it called concrete mixer? |
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Posted by: concretemixer - 09-15-2022, 12:43 AM - Forum: concrete machinery
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The cement mixer shot is both one of the most popular shot drinks and, in some opinions, one of the most disgusting. Why it has endured is a great mystery in the bar world. The reason may have a lot to do with the reaction of those who drink it and the laugh their friends get out of watching it go down.
The drink itself does not taste bad—citrus and cream are not a poor combination. The real problem is the texture; it is named the cement mixer because it's imagined to be a lot like drinking concrete. If you have a tendency to gag on certain food textures, this shot is probably not for you. It can be a hard drink to get down and there are plenty of tastier shooters to enjoy instead.
An interesting chemical reaction takes place when you make the cement mixer. As the shot sits, the fat of the Irish cream and the acid of the lime juice slowly combine. Within seconds, a thick, lumpy slurry is created that will get thicker over time, especially when it's agitated. If you need a visual, go ahead and stir it with a straw and watch the "magic" happen. The texture is best compared to cottage cheese or (more appropriately) uncured cement. Timing is important when drinking a cement mixer; you don't want to wait too long or the mix will become too thick. Also, the more lime juice you use, the chunkier it will become.
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| What are Concrete Placers? |
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Posted by: concretemachine - 09-13-2022, 06:42 AM - Forum: concrete machinery
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Concrete placers are large, motorized, conveyor-equipped, heavy construction machines. They can be either chutes conveying concrete from a mixer to a narrow formed area, or very wide dumpers averaging approximately 60 feet (18.6 m) in width that convey uncured concrete from a mixer and place it efficiently within a wide area.
Hand-wielded implements that are advertised and sold as concrete placers are more properly concrete levelers which are blades, averaging some 19 inches (48.3cm) in width and are usually constructed of aluminum or steel, with a long wood or fiberglass handle attached. The blade at the working end of these hand-wielded concrete placers/levelers looks like an ice scraper or a squeegee.
The large, mechanical, conveyor-equipped concrete placers resemble very low roadway bridges. These machines are designed to place and level the concrete mix across the entire width of a road using a combination conveyor and tilt-dumping system fed by concrete mixing trucks or vehicles capable of transporting the mixture without allowing it to cure. These conveyor-type placers are most commonly used to pave roads, highways, airport runways, culverts and large parking lots. Conveyor-type concrete placers are either tracked or mounted on pneumatic tires and are capable of self-maneuvering. After the concrete has been poured, spread and leveled by a mechanical placer, workers will then use hand-held concrete placers/levelers or other concrete tools to accomplish any minor touch-up tasks.
Concrete placers can also be small, drum-style mixers that can be mounted between the blade arms of a front-end loader and maneuvered in areas that are too restricted for a conveyor-type placer. The mixer is motor driven and the mixing drum can be tilted using the machine's hydraulic system which allows the mixture to be poured wherever desired and then spread rapidly and efficiently with a spreader mounted below the mixer. These types of mechanical concrete placers would be utilized to lay concrete driveways, patios, or floors for small and medium-sized structures.
The hand-wielded concrete placer or leveler can be used in a number of applications such as placing, spreading, leveling and smoothing the uncured or liquefied mixture. These small concrete placers/levelers are useful for anything from minor touch-up work on large paving projects to working concrete in a localized area. Other types of hand-held concrete tools include trowels, rakes, edgers, floats and brushes.
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| What Is a Concrete Conveyor? |
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Posted by: concretemachine - 09-13-2022, 06:40 AM - Forum: concrete machinery
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A concrete conveyor is a piece of heavy machinery used to transport mixed concrete from a truck or other containment system to another location for pouring and curing. Sometimes the concrete conveyor is a part of a cement mixing truck, and the conveyor can be moved into position once the truck is parked. When the truck is in transport, the conveyor can be moved flush with the body of the vehicle for safety and aerodynamics. In other instances, the conveyor system is an independent unit that can be hauled into place by a towing vehicle.
Once in position, the concrete conveyor will allow workers to mix concrete in one location, and then transport that mixed concrete to another location quickly and easily so it can be poured in place. This is useful in situations in which the mixing equipment cannot be positioned close enough to a mold or other location in need of mixed concrete. The concrete conveyor is also useful in pouring very large sections of concrete: the conveyor can be positioned at the far end of the marked location, then moved as the concrete is poured over the large area.
The specific design of the concrete conveyor can vary, though most will feature a hopper of some sort in which the mixed concrete will be poured. This hopper will then release a measured amount of concrete at one time onto the conveyor belt, which will then transport the mixed material to the other end of the conveyor system. Once the concrete reaches the end of the conveyor system, it will fall through a funnel or tube that can be manipulated so a user can control where the concrete falls. The walls of the conveyor system will help prevent the mixed concrete from falling off the sides, thereby preventing concrete from curing where it should not otherwise be.
If the concrete conveyor is affixed to a cement mixing truck, the concrete will be fed into the hopper from the rotating mixing drum automatically. If the conveyor is an independent unit, concrete may need to be fed manually onto the conveyor by a worker with a shovel. The specific process will vary according to the size of the construction process and the amount of access space available for transporting equipment and concrete. The length of the conveyor itself can also vary significantly according to the size of the job.
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| What is earth-moving machineries? |
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Posted by: concretemachine - 09-09-2022, 02:01 AM - Forum: Earth moving machinery
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Earth moving machinery is heavy equipment, typically heavy-duty vehicles designed for construction operations which involve earthworks. They are used to move large amounts of earth, to dig foundations for landscaping and so on. Earthmoving equipment may also be referred to as; heavy trucks, heavy machines, construction equipment, engineering equipment, heavy vehicles and heavy hydraulics. Most earthmoving equipment uses hydraulic drives as the primary source of motion.
On the bases of operation, earthmoving equipment categorised as:
Excavators (compact excavator, dredging, dragline excavator, front shovel and others).
Loaders (skip loader and wheel loader).
Construction tractors (grader, scraper, track loader, material handler).
Others.
Earthmoving equipment is mainly used in the construction industry, but other major applications include mining, digging and other heavy duty work.
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| What Is A Concrete Pump? |
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Posted by: Eddiejet - 09-08-2022, 03:24 AM - Forum: concrete machinery
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concrete pump is a time-, cost-, and back-saving machine that moves wet concrete to places where concrete mixer trucks cannot reach. There are two main types of concrete pumps—boom pumps and line pumps.
Both of these pumps can reach over, under, high up, deep down below, and far away from the concrete mixer trucks to pour concrete quickly and accurately.
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| HOW DO CONCRETE PUMP TRUCKS WORK? |
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Posted by: wade - 09-08-2022, 03:21 AM - Forum: concrete machinery
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The simple answer to "how concrete pumps work" is, a concrete truck discharges its concrete into a hopper on the back of the pump truck. The hopper has a mesh grate the concrete falls through which prevents any large rocks or chunks from plugging the pump truck hoses. The hopper also has an auger that churns the concrete keeping it liquid and flowable.
Once the concrete is in the hopper, it gets sucked into a valve system in small intervals or strokes. As some of the concrete is being sucked into the valve, the concrete before it is being simultaneously pushed through the concrete pipe on the pump truck boom until it reaches the end of the concrete hose and placed where you need it.
Some concrete pump trucks have different types of valve systems, s-valves, ball-valves, but basically that's how a concrete pump works. As long as the hopper stays full and there are no blockages in the concrete hoses, the process of pumping the concrete goes quite smoothly.
Having a good concrete pump truck operator is also very important. Their experience and wisdom is key to handling any problems that may occur, fixing them, and keeping the pour going.
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| WHY USE A CONCRETE PUMP TRUCK? |
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Posted by: wade - 09-08-2022, 03:19 AM - Forum: concrete machinery
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Some advantages for using a pump truck to place your concrete are; the pump truck can reach over houses and into backyards, a pump truck can pump concrete up 2, 3, 4 floors and more, pump trucks place the concrete right where you need it, pumping concrete is fast which saves on labor cost, pumping the concrete reduces the amount of manpower you need to place the concrete.
If you've ever wheelbarrowed 10 - 20 yards of concrete over a long distance or used a concrete powerbuggy to place a 100 yard slab, you know exactly what I mean. You know why it makes sense to use a concrete pump truck.
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| How Does the Pumping System work? |
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Posted by: wade - 09-08-2022, 03:18 AM - Forum: concrete machinery
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The concrete trailer pump is a hydraulic double cylinder piston type pump, which is driven by an electric or diesel motor. The pump system adopts a closed oil circuit, constant power control, and concrete conveying volume adjustment.
how does the concrete pump work
(1)(2) main oil cylinder ; (3) water tank ; (4) reversing device; (5)(6) concrete cylinder; (7)(8) concrete piston; (9) hopper; (10) distribution valve; (11) swing arm; (12)(13) swing cylinder; (14) concrete outlet
![[Image: pumping-system.png]](https://ltconcretepump.com/wp-content/uploads/2021/06/pumping-system.png)
First, the concrete piston is respectively connected with the piston rod of the main oil cylinder. Under the action of the hydraulic oil of the main oil cylinder, one cylinder moves back, while the other cylinder moves forward.
Second, the outlet of the distributing valve connects with the outlet. The other end connects with the swinging arm through a spline shaft and can swing left or right under the action of the swinging oil cylinder.
Then, when pumping concrete materials, the concrete piston advances, the concrete piston retreats under the action of the main cylinder.
At the same time, under the action of the swinging cylinder, the distribution valve connects with the concrete, and the concrete cylinder connects with the hopper.
In this way, the concrete piston backward, then the concrete in the hopper into the concrete cylinder, concrete piston forward, the concrete cylinder send material into the distribution valve pump.
When the concrete piston retreats to the end of the stroke, the reversing device in the water tank is triggered. Again, the main oil cylinder is reversed to start continuous pumping.
The main oil cylinder changes direction simultaneously swings the oil cylinder to change direction. Then the distribution valve connects with the concrete cylinder, and the concrete cylinder outlet connects with the hopper.
At this time, the piston retreats and goes forward, achieving continuous pumping.
When the reverse pumping starts, in the suction process, the distributing valve connects one concrete cylinder with the pump outlet. On the contrary, in the push process, the distributing valve will connect this concrete cylinder directly with the concrete hopper. In this way, pump will draw the concrete in the pipeline back to the hopper.
The distribution valve is the key part of the concrete pump, and its type will directly affect the performance of the concrete pump.
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