Two dead after a walkway collapse of an aging Italian housing estate.
https://www.theguardian.com/world/article/2024/jul/23/walkway-collapse-naples-le-vele-di-scampia
I have a pile wall composed of large diameter steel tubes linked by clutches and a very stiff capping beam.
I am concerned that clutch friction might increase the assessed capacity of a pile (tested individually) when in reality all piles in the locality would be loaded simultaneously and...
I have a project with 1500mm and 1800mm cast in situ piles. Long sacrificial liners driven through the seabed (soft silt), pulling up in weak rock, socket cut into hard rock. Some piles are being CAPWAPed (high strain dynamic test), more are being low strain integrity tested. It is the low...
I am looking for a Chinese construction materials testing lab that has a history of producing accurate results, regardless of who is paying for the testing. Any suggestions?
I've done some work with steel fibres in small aggregate concretes (almost grouts) for a couple of tricky situations but I've now been asked to look at something a notch harder than that.
Does anybody here have experience with fibres in cementitious grouts, for use in grouting the annulus of...
Quite a lot of tanks and other infrastructure in wastewater treatment plants are built from reinforced concrete. I have found indications of macrocell corrosion in both bioreactors and final settling tanks/clarifiers in three WWTPs over the last couple of years.
Accepted wisdom is that...
I am having trouble pinning down anybody in our company with experience of ZAM coating, from Nisshin. An unusual form of hot-dip galvanising, the advertising suggests that the zinc, aluminium and magnesium coating can protect cut edges. Any comments from somebody with ZAM experience would be...
I've been asked about topping a seaside boat ramp in AC. There are several aspects that concern me (eg friction and installation) but I'm also not sure about durability with seawater wetting/drying cycles. I vaguely recall a couple of tidal causeways in France that may be AC. Could somebody...
Has anybody come across durability problems with Fibre Reinforced Cement pipes (otherwise known as 'fibre cement') installed for up to 30 years? The fibres were originally asbestos, now cellulose.
I am beginning to investigate some failures of these pipes when installed 'architecturally' as a...
The contractor has hot-bent some N28 rebar that was epoxy-doweled into some new construction. N is 500+ MPa reinforcement. I know a little about the material properties of 300 MPa steels but not this.
The structure is subject to heavy fatigue loading (limiting factor) but only a low percentage...
Several pretensioned M-beams on one of my overbridges have been struck by an over-height lorry. On the worst beam, several strands are exposed and the surrounding concrete has significant cracking (looks like shale). The visible damage to the flange soffit almost extends to the web with a...
I am hoping for some general help in understanding the behaviour of freyssinet hinges used in slabs rather than columns.
The problem I have regards an old design of motorway bridge. It uses 1 foot thick freysinnet hinges to support a 3 foot thick reinforced concrete suspended slab deck from...
