Casting large sections of concrete is normally done in stages, where the previous pour is left to partially set before casting the next section. The Hoover dam was cast continuously in multiple sections, with careful temperature control, but it is an exception. The joint between the new and previous pour is tricky if the aim is to produce a monolithic continuity. The top of the previous pour has relatively little force on it, while the bottom of the new pour on top of it has the weight and pressure of all the concrete above it, pushing the formwork out further than the top of the previous pour. You can see that in this example in Winnipeg, where the second pour starts to fill the gap of the pushed out formwork, and the thickness of the wall increases at the bottom of the second pour. This example is for a housing project, but this similar examples can be found all over the Prairies in the bases to grain silos, where the sort of care normally taken in architectural situations is not required. Once solidified, the forces of formation are petrified in the joint.
Thanks to Phoebe chard for the Photos.
When building his own house in Kings Road, Hollywood (see here and here), Schindler used Irving Gill’s tilt slab method of casting his walls on the floor slab they had already cast. They started casting in Clyde Chase’s studio, where you can see evidence of the burlap separating layer in the castings. Schindler’s studio was the last on the list, by which time they had worked out the process. In Marion Chase and Pauline Schindler’s studios you can see how they got there. Here are samples from Clyde Chase and Rudolph Schindler’s studios.
A few 3D views of Gehry’s Disney Concert Hall in L.A.
Some views of Bill Harrison’s VaVaVoom garage deep in rural Manitoba
The same insulated tarp that I posted a couple of days ago at night
A drugstore under construction in Winnipeg, where I lived for seven and a half years. It gets quite cold in the winter (sometimes down to about -40c before wind-chill) so the building trade has all sorts of ways of dealing with these conditions, including these insulated tarps. The city is a riot of beige so the quite common site of these orange tarps cheers the place up a little. Photo courtesy of my daughter Phoebe.