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Brava: Multifamily High-Rise At 414 Milam St.

brijonmang

By brijonmang
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Avossos

Avossos

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21 hours ago, ekdrm2d1 said:

 

It was nice to meet you!  Thanks for coming out.

 

Here's my photos of the mat pour this morning.

 

 

 

Great meeting you as well! I enjoyed your take / passion for large scale construction projects. Looking at your pictures, you definitely have a good eye... Our pictures were good, but I think you caught the scale of development and effort much better.

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Luminare

Luminare

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Posted
20 minutes ago, Nate99 said:

Baking foundation...

 

 

4517AC98-7A33-4188-B6FE-0448F712D156.jpeg

4844DAC0-889E-4451-A3D2-7D2944416CEA.jpeg

 

Wouldn't it be fun if you could actually "bake" a building. In this example with all the tarps the building could come out like a souffle. Just pull the tarps and out grows a full building.

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Purdueenginerd

Purdueenginerd

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20 hours ago, Luminare said:

 

Wouldn't it be fun if you could actually "bake" a building. In this example with all the tarps the building could come out like a souffle. Just pull the tarps and out grows a full building.

 

A few years ago I had a repair project at petrochemical facility where we had a mass-pour with a high-early strength concrete. A 2' thick concrete roof deck for a below grade structure.  After the concrete set (to give you context on how fast it was setting, I could walk on one side of the roof while the other side I would sink into), the contractor basically flooded the top of the concrete with 3 inches of water. The next morning, I recorded the water temperature at 120ºF. It was stunning to me how much energy it put out curing. The contractor indicated they had a fire break out several years back because of extreme exotherming of the setting concrete. 

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Purdueenginerd

Purdueenginerd

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5 minutes ago, wxman said:

Can somebody please explain what's going  on here? I've never seen or heard of this before. What makes this different from all the other pours where they pump the concrete in and it's done?

 

Concrete curing procedures are based on ACI 308.1 (http://dl.mycivil.ir/dozanani/ACI/ACI 308.1-98 Standard Specification for Curing Concrete_MyCivil.ir.pdf) (link is for the 1998 version, I think the latest version is actually 13). Can't tell what they've put down from the photos but at least from 200' away they appear to be complying with section 2.

 

A contractor, should follow curing procedures on all of their concrete placements. Outdoor Flat work pours are especially susceptible to damage if procedure isnt followed. 
 

Quote

 

SECTION 2—MOISTURE RETENTION 2.1—

General 2.1.1 Description—This section covers methods and procedures for curing concrete using plastic sheets, plastic sheets bonded to water-absorbent fabric, or reinforced paper.
2.2—Products

2.2.1 Plastic sheets shall be polyethylene with a minimum thickness of 0.1 mm (0.004 in.) or 4 mil plastic sheets bonded to water-absorbent fabric shall have a minimum thickness of 0.1 mm (0.004 in.) or 4 mil polyethylene film bonded to a layer of cotton, burlap, manufactured fabric, or other absorptive material. Sheets shall meet the requirements of ASTM C 171.

2.2.2 Reinforced paper shall consist of two layers of kraft paper bonded with a layer of bituminous adhesive, reinforced with non-asbestos fibers. Reinforced paper shall comply with ASTM C 171. 2.3—

Execution 2.3.1 Place material on the concrete surface as soon as possible without marring the surface. Cover all exposed concrete surfaces and beyond the edge of the concrete surface. Securely tape sheets together or lap them. Maintain the integrity of the material and the ability to contain the water on the concrete surface throughout the curing period. 2.3.2 Verify that the concrete is continuously wet under the sheets; otherwise, add water through soaker hoses under the sheets.

2.3.3 Use black or dark colored plastic sheets when the daily high ambient temperature is below 15 C (60 F). Use white or similarly reflective plastic sheets when the daily high ambient temperature is above 30 C (8 5F). Use any color or transparency of plastic sheet at temperatures between 15 and 30 C (60 and 85F)

 

 

The reason for performing these actions is because when concrete cures, the chemical reaction of water and cementitious materials puts off heat, ie, it is an exothermic reaction. A temperature differential between the interior and the exterior faces of the concrete can built up tensile stresses and cause large cracking in the face of the concrete (this is bad!) In addition, for flatwork and/or outside pours, air flow, evaporation, and sunlight can change the strength characteristics of exposed sections of the concrete(this is bad!). Curing procedures are put in place to make sure these bad things dont happen or are mitigated. IE, ensuring that exothermic concrete can dissipate heat more quickly, or alternatively, make the concrete uniformly warm. 

 

For Mass pours.. or concrete placements that are huge. Additional steps have to be taken to mitigate these affects. ACI207.1R-14 (http://dl.mycivil.ir/dozanani/ACI/ACI 207.1R-05 Guide to Mass Concrete_MyCivil.ir.pdf) (i've provided an older version). Provides guidelines and specifications on how to handle that. The history section of the commentary is quite educational if you'd like to learn more. There are additional specifications for Hot weather and Cold Weather concreting. 

 

 

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jmitch94

jmitch94

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Soooo glad you posted this I was about to ask if they needed to do anything to cool down pours this big. I'm a decent history buff and have heard a 100 times about how they had to run cooling pipes in the Hover dam because the heat generated would be immense and I was wondering if pours of this size needed cooling down too. 

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Nate99

Nate99

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14 hours ago, jmitch94 said:

Soooo glad you posted this I was about to ask if they needed to do anything to cool down pours this big. I'm a decent history buff and have heard a 100 times about how they had to run cooling pipes in the Hover dam because the heat generated would be immense and I was wondering if pours of this size needed cooling down too. 


I saw a documentary on the Burj Khalifa where they showed the construction crew dumping massive amounts of ice into the concrete mix as it made its way to the pumps. Interesting stuff. 

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Purdueenginerd

Purdueenginerd

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8 minutes ago, Nate99 said:


I saw a documentary on the Burj Khalifa where they showed the construction crew dumping massive amounts of ice into the concrete mix as it made its way to the pumps. Interesting stuff. 

 

more common than you think! Even for small-ish pours. Refer to section 2.4

 

http://dl.mycivil.ir/dozanani/ACI/ACI 305R-99 Hot Weather Concreting_MyCivil.ir.pdf    (older version)

 

 

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hindesky

hindesky

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The tower crane is going up this weekend and Milam and Prairie will be partially closed.

Reduced Traffic Lanes on Milam and Prairie
Friday, December 20 - Sunday, December 22
Harvey will be reducing the traffic lanes on Milam and closing the 700 block of Prairie Street in order to erect our tower crane. The closures are scheduled to begin 12/20 at 7 pm and continue until 12/22 at 11:59 pm.

During these hours, Milam traffic on the 400 and 500 block will be reduced to a single lane on the east side with all business entrances along Milam remaining accessible. Prairie street will also be reduced to a single lane on the 800 block (northern lane). Lastly, the western traffic on Prairie will be required to turn south onto Milam with a full closure of the 700 block of Prairie.
Contact: DE HARVEY, Dean Braddock 😄 832-768-7331

 

QRYvng3.png

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ArtNsf

ArtNsf

Posted
Posted (edited)
On 12/19/2019 at 9:15 PM, hindesky said:

The tower crane is going up this weekend and Milam and Prairie will be partially closed.

Reduced Traffic Lanes on Milam and Prairie
Friday, December 20 - Sunday, December 22
Harvey will be reducing the traffic lanes on Milam and closing the 700 block of Prairie Street in order to erect our tower crane. The closures are scheduled to begin 12/20 at 7 pm and continue until 12/22 at 11:59 pm.

During these hours, Milam traffic on the 400 and 500 block will be reduced to a single lane on the east side with all business entrances along Milam remaining accessible. Prairie street will also be reduced to a single lane on the 800 block (northern lane). Lastly, the western traffic on Prairie will be required to turn south onto Milam with a full closure of the 700 block of Prairie.
Contact: DE HARVEY, Dean Braddock 😄 832-768-7331

 

QRYvng3.png

 

Okay, I'll say it.  Wow, just wow.  I'm so happy they are alerting us to this erection. LOL !  Good news however that it has started though.

 

Edited by ArtNsf
correction of grammer/spelling
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mls1202

mls1202

Posted
Posted

Sorry if this has been mentioned elsewhere, but I am surprised at how close it is to the adjacent building (Hogg).  If those windows are residential units (as opposed to say, an interior hallway, the value of those units has to be pretty much destroyed as they will be looking straight into what I imagine is a parking garage!

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hindesky

hindesky

Posted
Posted
2 minutes ago, Urbannizer said:

Why was the tower crane installation delayed?

I don't know. Wanted to ask a guy I had talked to before but he was always on the phone when I rode by. There was an At crane on the south side but it wasn't anywhere big enough to set tower crane parts. I assume the crawler crane might set parts of it but it doesn't have the main block on it and when I operated a crawler crane like this it's only good for about 15,000 lbs on the jib.

DLPcPtm.jpg

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jermh

jermh

Posted
Posted
On 12/23/2019 at 6:39 PM, mls1202 said:

Sorry if this has been mentioned elsewhere, but I am surprised at how close it is to the adjacent building (Hogg).  If those windows are residential units (as opposed to say, an interior hallway, the value of those units has to be pretty much destroyed as they will be looking straight into what I imagine is a parking garage!

 

Hogg Palace is more or less an Airbnb style hotel at this point. You can find a bunch of the apartments for rent on sonder. As for the view, I'm betting you're right! Depending on the height of the garage, those windows are going to get a lot of privacy or a close up view of the Preston's pool deck. 

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