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  1. 4wilmar

    Concret Pile Caps

    Sorry I haven't visited the forum in a while. Just to let you know, the pile cap was poured with a mix design which included 25% flyash, but no addition of any ice (despite my concerns) to control the initial concrete temp. which went in at about 90 degrees. Day time temps were runing about...
  2. 4wilmar

    Concret Pile Caps

    We have made them aware of ACI's recomendations including the 3 ft criteria, but they don't seem to care. They'll start early in the morning and they do have some fly ash in the mix which should help but they are not going to add any ice or chilled water in the mix.
  3. 4wilmar

    Concrete Pile Caps

    Sorry if the 2cd sentence in # 2 confuses the issue, I meant to say that the achors extend only 2 ft into the bottom of the pile cap.
  4. 4wilmar

    Concrete Pile Caps

    Thanks for your comments: 1 They plan to cast full height in one pour, which has me worried as well since they do not intend to take any precautions such as chilled water, ice or insulating blankets (nothing really). 2 I am not sure about the magnitude of the up lift since I was not envolved...
  5. 4wilmar

    Concrete Pile Caps

    As part of the on site QC team, I am concerned about thermal cracking in some up-coming pile cap pours which are over 10 ft thick, 15 ft wide and 20 ft long. However the designers have declared that these are not really mass concrete pours and no speacial precations need to be taken. 1. If...
  6. 4wilmar

    Concret Pile Caps

    As part of the QC team on site I am concerned about thermal cracking on some up-coming pile cap pours which are over 10 ft thick, 15 ft wide & 20 ft long. However the designers advise that these are not really mass concrete pours and no speacial precautions need be taken. 1 If none of the...
  7. 4wilmar

    Concrete Pile Caps

    As part of the QC team on site I am concerned about heat of hydration and thermal cracking on several up-coming pile cap pours which are over 10 ft thick, 15 ft wide & 20 ft long. However the designers have advised us that they are not really to be considered as mass concrete pours and we need...
  8. 4wilmar

    Full depth slab replacement for concrete balcony?

    I agree with Jike and others above: be careful about bonding agents. If you chip out only the loose or fractured concrete (even if it leaves the holes rough and irregual) the repairs may be small enough to consider an epoxy grout rather than a bonding agent with cementitious material. I think...
  9. 4wilmar

    slipform

    Try "DOKA Formwork" , "Siemens" or some of the other major formwork manufacturers and search the web for concrete formwork or slip forms.
  10. 4wilmar

    HDPE Butt Fusion Machine for Arctic Pipe

    All butt fusion machines that I know of require a grip on the pipe itself so any exterior insulation (CMP) would have to be stripped back. However such a machine may exist, so I suggest you search the net & talk to the equipment manufacturers. Butt welding machines are generally larger &...
  11. 4wilmar

    sizing standees in a concrete slab

    CRSI Manual of Std. Practice does not actually recommend #3 standees. For slabs 2 ft thick & less you should use #4 standees (see section 3.14.2) spaced at about 3-4 ft.
  12. 4wilmar

    CONCRETE SPECS & FLOOR FLATNESS

    Further to the ACI & ASTM references above you can go to faceco.com/40q.htlm (40 most asked questions about F numbers). This was put together by Face Company who make profile surveys and/or equipment to do so. I have not used them or their equipment, but they seem to know a lot about it. I do...
  13. 4wilmar

    Decoding foreign rebar markings

    Sorry I missed your post, I don't often look under Concrete Formwork. I spent a number of years working in the United Arab Emirates and a lot of Turkish rebar was used there, some good, some bad. I don't recall the KWT mark, but it has been a few years since I worked there. I suggest you...
  14. 4wilmar

    Shear/Tension capacity of rebar?

    Anchoring into rock is rather speacialized work and you might want to contact "Williams" or another manufacturer that makes rock anchors. Regardless of what the numbers say I would also do a pull test on a couple of installed anchors just to be sure the rock, grout & anchor are all working...
  15. 4wilmar

    Traditional heel on the retaining wall's footing

    Yes, you have to excavate and it must be shored, sloped or stepped back in a safe manner to prevent soil collapse.
  16. 4wilmar

    Traditional heel on the retaining wall's footing

    The heel of a retaining wall footing is typically longer than the toe and is placed under the slope or higher side of the wall. However in order to avoid disturbing adjacent structures I have made the heel very short and the toe very very long (not the most efficent way to design a retaining...
  17. 4wilmar

    Weight Room Live Load

    You might contact Natalus or some of the other companies that manufacture weight lifting machines & equipment and ask what they recommend. In addition, the weight room should probably have some type of flooring (thick rubber pads or wooden platforms) to absorb the repetative impact. Years I...
  18. 4wilmar

    Rebar Detailing

    Thanks for your help, I will discuss the issue with our Eng. & detailer.
  19. 4wilmar

    Rebar Detailing

    We are currently constructing several low rise (2, 3 & 4 story) office buildings. All cast in place with concrete shear walls. The column spacings and beam spans are quite uniform so we are looking for ways to pre-fab the beam cages & slab steel and drop them into place. I recon this could be...
  20. 4wilmar

    Concrete Crank Injection

    There was a flexible vinlyester injection resin on the market which swells tight when exposed to water. I have used it with good success on concrete reservoirs in the middle east. A bit expensive and difficult to mix as there are several components, but it is probably your best bet to keep the...

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