What are your views regarding the Advanced Concrete Technology Course (ACT) offered by the Institute of Concrete Technology, UK? Is it applicable in your part of the world and is it highly regarded? Have some of you completed this course?
Dik - will see what I can find out on your request. Thank you.
dicksewerrat - He is a Pr.Eng with close to 40 years experience and holds a Ph.D, not a lecturer.
Dik,
The engineer is a senior with a Ph.D in water engineering - he is sure that cavitation is not the problem, maybe I am just not understanding his explanation well enough or am failing to convey it properly. I have not been able to go out to the site again as it is some distance away, but...
I have little hydraulic experience, but requested that the design engineer have a look at this thread and provide accurate info and answers. It is possible that I misunderstood his explanation.
Gents,
I have been away for a long weekend and could not answer sooner - thank you for all the feedback so far. Unfortunately I don't currently have other/more closeups photos, but will take some more during our next site visit and get some more info if possible. I will also have another chat...
Dik, just spoke to the designer and he is adamant that it is not cavitation as pressures are to low. Thus sediment is the culprit.http://files.engineering.com/getfile.aspx?folder=02648478-c270-4d09-8949-7cbb3ebd75c1&file=Selati_Wier_(Medium).jpg
Hi,
We are currently repairing some concrete weirs. The constant problem we are experiencing is the abrasion found on the downstream side of the crown (see picture below). The sediment has erodes the concrete, exposes the aggregate and so decreases the durability.
The flow speeds of the river...
I once made two batches of test cubes with the same w/c ratio but the 1st batch was the normal stone/sand/cement mix we use on site for water retaining structures, while the 2nd was a sand/cement mix. For the sand/cement mix I just left out the stone and replaced it with more sand.
The...
I have heard of guys doing a similar competition that cooled their aggregates in the fridge before mixing, as they did the water. This apparently slowed down the hydration and so increased the long term strength.
Silica fume will increase your density - it might also increase your water demand...
