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| Copyleft: 2005 photo by David Benbennick |
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| Public Domain: 2004 photo by Scott Seitz |
There is an auger (spiral blade) the full length of the drum. When the concrete is being transported, the drum is rotated in the direction that well push the material to the back of the drum. This mixes the materials and keeps the concrete liquid. At the site, the drum is rotated in the other direction to push the concrete out of the drum and down the discharge chute.
This is the first example I have seen of a ready-mix truck. See McCormick Blvd. for how paving was done before trucks became big enough to allow ready-mix loads.
As a kid, I also helped shovel gravel into a portable mixer on my Grandfather's dairy farm. Especially when they paved their barnyard. Using a shovel is one of the few things I learned to do left-handed. That was because my uncle would be on the side used for right-handed shoveling. As an adult, I again had the joy of shoveling gravel when we poured 3.5-foot deep footings for our deck.
While checking out the railroad in Macomb, IL, I came across a plant that charges the ready-mix trucks with the needed materials. (Note the covered hopper on the right side of the photo that is still in Burlington Northern green even though it has been almost ten years since it merged with Santa Fe to form BNSF.)
The ready-mix trucks during my youth would struggle to drive across the property so that the chute would discharge where it was needed. Even then, they may have to use wheel borrows and shovels to move the concrete to where it was needed. Now they build trucks with a boom that folds and that carries pipes and hoses so that the concrete can be discharged directly where needed while the truck remains off to the side.
When they poured the foundation for a house across the street from me, they used a technology I had not seen before --- a telescopic conveyor boom. They parked the truck at the curb and used the boom to deliver the concrete. They would have had a hard time doing it the old fashioned way of backing a truck onto the property close to where it was needed because the houses on the adjacent lots are rather close.
They used a smaller version than this truck. These big outriggers would have interfered with the second lane of traffic on Main Street. Just as a photo is sometimes worth a thousand words, a video can be worth a thousand photos. I learned from the video that an advantage of the conveyor belt is that it can deliver gravel for the substrate as well as the concrete. Skip to timestamp 8:00 to see the concrete being poured. The truck used for the house in our neighborhood was also controlled by a man carrying a remote control box. The beginning of the wind energy video is interesting to see how wide the support foundation is to resist the force exerted by the turbine tower.
I notice that the development of concrete pumps and conveyor trucks has reduced the need for front-discharge trucks.
In addition to advances in technologies to deliver the concrete to the forms and slabs at the construction site, advances have been made in how to mix the concrete. After concrete is poured, the cement reacts with the water to form the strong "glue" that hold the aggregates together. This hydration of cementitious materials is an exothermic reaction. In large monoliths such as dams or the 10-foot deep "mats" for skyscrapers and smokestacks, the reaction can raise the temperature of the interior high enough that it would cause cracking. To control the temperatures for the Hoover Dam, they installed pipe in the structure to pump cooling water through the dam. For modern construction they add a few ounces of several ingredients to control the temperature. For example, for Trump's Big Pour, standard concrete would reach temperatures of around 200 degrees at the center. The mix developed for that pour was specified to have a placement temperature of less than 80 degrees (F) and a maximum of 170 degrees (F). The supplier, Prairie Materials, developed a special mix that exceeded the specifications.
Update:
World's Largest Concrete Pump Truck
A video of a woman pushing the hose around and operating it with a remote strapped to her waist I wonder why the concrete doesn't flow more consistently.
Gary Ferguson Very rare that the pump operator would ever also handle the hose. It is not only wrong but very unsafe in my opinion.
Ken Degman That girl is badass!! Usually pump operators just stand there.[Normally I see the operator on the side with the remote and the crew handles the hose.]
Terry Sumner Barely a trickle there.
[There are other comments about the operator should not be on the placing hose.]
Jim Holland Looks like wet ass concrete, no consolidation being done... how much did the client pay for those shrinkage cracks he will absolutely have?
[I've seen unions use the argument for safety to justify featherbedding. But in this case, I think operating the boom and handling the hose is two jobs.]
The 92-story Trump Tower in Chicago was the world's tallest concrete-reinforced building when it was completed. Its construction used concrete pumps including "A custom-built pump imported from Germany was used to handle the uppermost stories because so much force was needed to push the concrete that high."
Six concrete-pump trucks to pour a pad with 1,700 truckloads in 20 hours.
See Buckingham Fountain for an example of how they delivered concrete on site long before the concrete pump was developed.
The technology for transferring concrete from a ready-mix truck to the forms built on the site before the pump was developed was a bucket. I'll add a closeup of a bucket when I come across one in the construction photos I took this summer. Sometimes a bucket is still used with a crane. Although I have never seen it moved as fast around here as it is in this video. Evidently the crane operator is paid by the bucket-load.
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| Mark Erskine posted Men at work in 1942 constructing a runway at RNZAF Ohakea. There are mostly older blokes on the shovels / tools because W.W.II was raging and the younger men would mostly be in the armed forces at that time. The Certified Concrete Readymix truck might be a 1936 Leyland Cub 6X4. With War time priorities / shortages, notice the truck is running on mostly bald tyres and no time to wash off the concrete splashes and cement dust!! Because of the size and importance of the job, they had a batching plant set up at Ohakea (thanks Lance) and the Readymix trucks stayed on site cycling between the batching plant and the men on the shovels. In the background, a couple RNZAF Lockheed Hudsons. Peter Fox: what's with the fancy boxing?Jim Sharp: Peter Fox the concrete was poured in hexagon shape so that any bomb damage could be easily repaired. Also any ground movement wouldn't leave Sharp corners sticking up. |
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| Public Domain: Jacks Rache |
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| 20141017-20 0136 |
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| John W. Coke posted German 30T capacity, 50T Gross Cement mixer [I've noticed in general that Europe seems to allow a lot bigger trucks on their roads than the USA does.] |
The photos of mixing the concrete on site in the 1920s have been moved to their own notes.
(Update: the world's largest concrete pump truck has its own notes.)
(Update: the world's largest concrete pump truck has its own notes.)
The ready-mix trucks during my youth would struggle to drive across the property so that the chute would discharge where it was needed. Even then, they may have to use wheel borrows and shovels to move the concrete to where it was needed. Now they build trucks with a boom that folds and that carries pipes and hoses so that the concrete can be discharged directly where needed while the truck remains off to the side.
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| Folded photo from KCP Pumps |
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| Unfolded photo from CIFA |
It is interesting to note how it was dump before pump trucks were developed.
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| Bill Betten posted Mark White: It's been said that all concrete batch plants around Seattle were occupied with this pour such that no other projects could get concrete until it was done. Chuck Gladfelter: Interesting. I drove a mixer truck 4 years and I didn’t realize it was feasible to pour a nonstop slab like that without doing it in layers. Learn something new every day. [Contemporary "Big Pours"] |
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| Schwing America posted No doubt this fine looking Schwing 58SX will star in a future publication of the GRAY MATTERS Newsletter! Special thanks to Wayne and Lori Bylsma of Cherokee Pumping Inc (Hampton GA)! |
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| Photo from Loop Belt Industries |
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| Photo from Loop Belt Industries |
They used a smaller version than this truck. These big outriggers would have interfered with the second lane of traffic on Main Street. Just as a photo is sometimes worth a thousand words, a video can be worth a thousand photos. I learned from the video that an advantage of the conveyor belt is that it can deliver gravel for the substrate as well as the concrete. Skip to timestamp 8:00 to see the concrete being poured. The truck used for the house in our neighborhood was also controlled by a man carrying a remote control box. The beginning of the wind energy video is interesting to see how wide the support foundation is to resist the force exerted by the turbine tower.
I notice that the development of concrete pumps and conveyor trucks has reduced the need for front-discharge trucks.
In addition to advances in technologies to deliver the concrete to the forms and slabs at the construction site, advances have been made in how to mix the concrete. After concrete is poured, the cement reacts with the water to form the strong "glue" that hold the aggregates together. This hydration of cementitious materials is an exothermic reaction. In large monoliths such as dams or the 10-foot deep "mats" for skyscrapers and smokestacks, the reaction can raise the temperature of the interior high enough that it would cause cracking. To control the temperatures for the Hoover Dam, they installed pipe in the structure to pump cooling water through the dam. For modern construction they add a few ounces of several ingredients to control the temperature. For example, for Trump's Big Pour, standard concrete would reach temperatures of around 200 degrees at the center. The mix developed for that pour was specified to have a placement temperature of less than 80 degrees (F) and a maximum of 170 degrees (F). The supplier, Prairie Materials, developed a special mix that exceeded the specifications.
Using a Self-Consolidating Concrete mix design that featured super plasticizers, low water and special cement, the concrete temperature never rose above 77 degrees during placement and the concrete in place reached a maximum of 155 degrees. The compressive strength reached 9,950 psi at 7 days and over 12,000 psi at 28 days - well within the specifications. (PRWEB)
World's Largest Concrete Pump Truck
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| Ahmad Akhras posted |
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| Screenshot |
I have never seen the need to have a crane assist before. Is it because they have a long hose hanging from the end? Normally, when I see a hose attached the boom is close to the ground and the hose is carrying the concrete horizontally further into a building.
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| Cerita Sakura posted BNSF Chillicothe Sub MOW crew pouring concrete using a concrete pumper supported by a railway crane. A concrete pump transfers freshly mixed concrete to difficult to reach worksites. This work was being done between MP 191.9 Ormonde and MP 197.1 Ponemah on the Chillicothe Sub. Although I could not reach the site, it looks like a bridge replacement project. Robert Brant: No outrigger deployed. Chad Doyle: Robert Brant they don’t have outriggers! We use shims. Michael Bachmann: Outriggers don't always have to be deployed and on those Ohio cranes, most are manually deployed so you work inside the load charts. Looks like a DE 650 Ohio, maybe an 80 tonner. |
Two pump trucks, each with room for two concrete trucks so that both pumps can continuously pour concrete.
They quit adding to the video gallery in 2016 even though construction is not supposed to be complete until 2018.
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| Photo from Gallery from DeBruler |
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| Schwing America posted Thanks to Michel and everyone at TPG for investing in another 8-Axle Quebec Legal Schwing 61SX. Our paint department loves this eye catching paint scheme! Westly Walker: I ran a 61m for Brundage & Bone and ACI Concrete Placement and that set up with the boom so far back really sucks! Not sure why anyone would want that. [There are some comments about the dead space behind the cab costing boom length.] |
Chance Mckibbin posted six photos with the comment: "Emergency recovery of a pump truck that went over on Friday. Went pretty smooth and amazingly there was not apparent damage to the pump truck boom. They folded her up and drive her away." (An advantage of a crane is that it can easily lift bigger mats off a support truck and place them on the ground and then extend the outriggers over the bigger mats. The cost of renting a crane to place bigger mats for this pump would be less than renting a crane to bail it out. That is, mats would need a lot smaller crane.)
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I wonder how the XXA stability assistance works. How can they support such a long horizontal boom reach with such a short outrigger offset? I don't see any counterweights on the highway side of the truck.
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| LiebherrConstruction posted Our Liebherr 36 XXT truck-mounted concrete pump with the new XXA stability assistance system. The new XXA stability assistance significantly increases the already great versatility of our XXT support and allows numerous additional support options. Of course, this is accomplished in compliance with the highest safety standards, starting with the set-up of the machine. The modern radio remote control allows sensitive boom movements and shows the operator all important parameters. |
A video of a woman pushing the hose around and operating it with a remote strapped to her waist I wonder why the concrete doesn't flow more consistently.
Gary Ferguson Very rare that the pump operator would ever also handle the hose. It is not only wrong but very unsafe in my opinion.
Ken Degman That girl is badass!! Usually pump operators just stand there.[Normally I see the operator on the side with the remote and the crew handles the hose.]
Terry Sumner Barely a trickle there.
[There are other comments about the operator should not be on the placing hose.]
Jim Holland Looks like wet ass concrete, no consolidation being done... how much did the client pay for those shrinkage cracks he will absolutely have?
[I've seen unions use the argument for safety to justify featherbedding. But in this case, I think operating the boom and handling the hose is two jobs.]
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| أبو يوسف المنشاوي commented on a video |
The 92-story Trump Tower in Chicago was the world's tallest concrete-reinforced building when it was completed. Its construction used concrete pumps including "A custom-built pump imported from Germany was used to handle the uppermost stories because so much force was needed to push the concrete that high."
Six concrete-pump trucks to pour a pad with 1,700 truckloads in 20 hours.
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| Legendary Machinery posted Dick Husted: must be 50 drum counters there ............. Robert Le Blanc: When the boss and owner hates cold joints. Adam Tutherow: Pumping from one truck to another. They aint playing. They paying. [In the upper-right corner. And I noticed that they seem to have a spare pump truck in the lower-left corner.] Donald Boles: I'm curious where and how big the mixing plant is. [I presume they are in an urban area that has multiple mixing plants.] Andrew Lobban: Concrete pour in Dubai well done ACC. |
See Buckingham Fountain for an example of how they delivered concrete on site long before the concrete pump was developed.
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| 0:29 timelapse video @ 0:10 The Walsh Group posted Archer Western poured approximately 2,600 cubic yards of concrete to construct the foundation of a new clearwell at the Pierce-Burch Water Treatment Plant in Arlington, Texas. The clearwell base measures 198 feet across and 28 inches thick. The pour started about 12:30 a.m. and lasted into the afternoon, utilizing about 280 mixer trucks and four pumper trucks. Read more via City of Arlington, TX - City Hall: https://www.arlingtontx.gov/.../news.../pierce_burch_update (Video by: Alberto Munguia / Foster CM Group). |
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| ArlingtonTX The two underground clearwells will store 8m gallons of treated water. The plant has a capacity of 75m gallons per day. Some Google search results: The tanks help the treatment plant run at a more steady flow even though demand can vary a lot. They also provide chlorine contact time for disinfection. |
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| Legendary Machinery posted [It looks like they have at least two spare pump trucks.] Art Peterson: 13,500 yards [After some comments about pumping to a pump, I took a closer look. In the upper right is two pumps feeding pumps. And five of the trucks are feeding pipes that go across the top of the floor.] Nick Race: Obviously essential to have a single pour base for ultimate strength. Roger Thieling: The trucks are coming and going constantly. I wonder how many different batch plants it took to batch this out. Kevin Frye: I’ve been part of a pour on a building 105 feet down. 27 hour pour 4 batch plants and x amount of trucks and pumpers. Reuben Jackson: That was the Enron building poor years ago I was there. Davis Bryant: Continuous pour no cold joints allowed |
MDOT posted three photos with the comment: "MDOT Pics of the Day: Pumping concrete 130 feet in the air at the InternationalBridge, to the top of Pier 19 under the U.S. arches, to finish their pier top rehabilitation project. With gracious support from the BlueWaterBridge MDOT 135-foot aerial lift."
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For smaller jobs, such as our driveway, gas powered wheelbarrows are used.
Pyramids in Bosnia were made with concrete blocks long before Roman times with concrete that is better than what we can make today.
The first concrete street in America
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| 20170712 0076 |
The first concrete street in America
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