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  1. ansys54

    Refractory Cost??

    Does anyone know what refractory is costing, supply and install per cft, per bag. Anything would help. We are trying to set up a budget for casting about 1400 cft of material. 600 to be gunited and 800 to be cast-in place.
  2. ansys54

    Refractory Cost??

    We are trying to set up a budget to install approx. 1400 cft of refractory. 800 cft to cast and 600 clean cft to gunite. Does anyone know what this goes for (supply and install) per cft, per bag, whatever.
  3. ansys54

    Concentrated load on slab

    Can anyone suggest a good book, reference material etc., to deal with calculating moment, shear, etc as a result of point loading a concrete slab. I just realized I've only ever dealt with beams. Even my old engineering texts have alot on beams but nothing about concentrated loads on slabs.
  4. ansys54

    Has anyone use Mastertop 300 Anvil Top

    Used a similar product from Sika. Problem was after a short time, the metal fibers rust and leave a dark orange colour. Client was not pleased since it really darkened the warehouse.
  5. ansys54

    Concentrated Load on Slab

    We're looking at hanging a monorail from from the underside of a concrete slab. I just realized after all my years as a professional engineer, I've not dealt with anything other than beams. Can anyone suggest any books to help determine moments created by point loads on slabs?
  6. ansys54

    Fibre Mesh vs Welded Wire Mesh

    We are considering replacing 6x6 6-6 wwm with fibre mesh in an office slab on grade. We are concerned only with crack control. Does anyone have information on the performance of fibre mesh.
  7. ansys54

    Concrete Slab Inside Tank Has Bulged Up

    We have a 60' dia tank. From the base working up is a concrete base slab, welded steel tank bottom, 3' of granular fill and a 6" slab on a 30 degree incline toward the centre of the tank. At approx. 17' out radially from the centre of the tank, the concrete slab has bulged up about 2'...
  8. ansys54

    Cannot Get 98% Compaction

    Thank you to everyone. As an engineer who has been in construction for many years, I agree with DRC1 in that a 1000lb diesel hits hard and deep. We took FOCHT3's advice and requested another proctor, and guess what? The proctor value was not 2350 as originally presented, it was 2140. Right...
  9. ansys54

    Cannot Get 98% Compaction

    We are working with a crushed rock from a mine site as a subgrade and the requirement is 98% compaction. The proctor values show 8% optimum moisture and density of 2350 kg/cum. We sat in one area for three minutes with a 1000lb diesel tamper and the density went from 89 to 89.5, a long way...
  10. ansys54

    Corrosion Resistant Fasteners

    I don't Metalguy however that's a good and obvious question which I hadn't thought of until now. I will test it. Kenvlach, this is not effluent and is NOT discharged directly into the environment. It gets recycled back into the process after it enters the trench.
  11. ansys54

    Corrosion Resistant Fasteners

    Yes they mix then spill onto a coated floor and run into the trench.
  12. ansys54

    Corrosion Resistant Fasteners

    Trench is made of concrete.
  13. ansys54

    Corrosion Resistant Fasteners

    Sodium Hydroxide PH is 14 and 93% Sulphuric is 0.3. I suspect a "Bad" and a "holler back" are consistent with what I thought but wasn't sure until now. Thanks to both of you. My specialty is concrete so if I can ever be of help just ask.
  14. ansys54

    Corrosion Resistant Fasteners

    Not sure if such a steel exists but here goes. We have a trench drain in a concrete slab. Draining into the trench is 50% Sodium Hydroxide(Caustic) and 93% Sulphuric Acid. Rather than form a ledge into the concrete to carry the trench grating, we're considering installing angle iron with...
  15. ansys54

    When to backfill a foundation??

    You should get 70% of your 28 day strength in about 14 days. It depends how high you're backfilling also but I would say a minimum of 14 days.
  16. ansys54

    Apron Slab Deterioration

    I agree dik. However I've done a lot of work around this mill and many times when we're breaking out old deteriorated slabs, we've found big and many chunks of clay mixed in with the granular base. Your comment this morning reminded me of that fact and that's why I wouldn't be surprised to...
  17. ansys54

    High Temperature Chemical Resistant Concrete

    Silica fume will increase resistance to sulphate attack. It acts like type 50 cement(type 5 in the U.S.) Sulphate Resistant Cement. So it depends what chemicals you're trying to ward off.
  18. ansys54

    Apron Slab Deterioration

    Thank you dik. The native soil in the area is a stiff clay and I wouldn't be surprised if clay got mixed in with some of the subbase backfill. I'm going to consider some of your points as I seek to unravel this mystery.
  19. ansys54

    Apron Slab Deterioration

    We have a 100' long heated(in winter) scale for weighing pulp trucks. At each end is a 10' long x12" thick approach slab which is deteriorating immediately adjacent the scale where the tires run over. The potholes are 30"x30" and 4" deep and appeared slowly over the past 5...
  20. ansys54

    High Temperature Chemical Resistant Concrete

    Depending on the quantity you require, there are many bagged mixes available that fit your needs. Masterbuilders, CPD, Sternson all have bagged mixes however cost/.45cu.feet is usually around $40. Generally these are used in pulp mills as floor toppings.

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