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You can think of it this way jfudo, you can cut slabs longitudinally along the cores without compromising strength. (ie. two slabs cut at 24" widths, acting together should behave mechanically as the original single 48" width slab, with and without topping). For modulation purposes you have...

I agree. However, in a few cases Concrete segregation also produces a weak and scaly top surface layer, which scratches easily revealing a powdery surface underneath which is about 3 mm thick.

Well, thank you very much Dick. I will have that in mind. It is probably quite cheap to have cement transported from elsewhere.

Hello, I've been trying unsuccessfully to locate a 52,5 cement manufacturer in Saudi Arabia or UAE. Can anybody enlighten me on the subject?. Thanks in Advance.

Should you wear a helmet in your car to get to work in the mornings?. I can imagine that having a cup of tea at home will soon be more hazardous than the work environment.

Thanks Dik

Hello, Has anybody used humidity sensors to keep mixed concrete Water/Cement ratios as constant as possible. If so what do you recommend. We use crushed limestone aggregate. Best wishes

I will have a look at the CaO content, Thanks

These panels are plant cast, There are no differences in batching or curing between panels with streaking and those with not. It just affects the surface of the panel, rain seems to wash the surface and cause streaking. It does not seem to be atmosphere contaminants, we tried tap water and the...

Thanks for all the information.

Thanks for the replies, By keeping the test cylinders covered up in the mould we get results which vary considerably, delaying stripping or strand cutting unnecessarily in occasions. We find that the reliability of our test results are affected by the shape of the element being manufactured...

Hello, I would like to know which concrete maturity meters are most popular in Precast applications. Where can I find more about them?. Best wishes

In theory the cement has no slag. I will however ask the manufacturers if there is any. Thanks for the reply.

Hello, I have a dark streak problem on my gray concrete panels. It occurs from what I gather after rain. It seems that the panel is OK if it does not rain on it shortly after de-moulding. The dark streaks seem to harden and it becomes almost impossible to remove them effectively. In my opinion...

Depends on various variables: 1. Coating on strands (original or contaminants from the bed) 2. Local strength (sometimes breaks are not representative i.e temperature gradients in the slab) 3. Compaction around the wire. 4. Type of hollow core machine used (some movement in the wire occurs...