Search results
Results From The WOW.Com Content Network
The alkali–silica reaction (ASR), also commonly known as concrete cancer, [3] is a deleterious internal swelling reaction that occurs over time in concrete between the highly alkaline cement paste and the reactive amorphous (i.e., non-crystalline) silica found in many common aggregates, given sufficient moisture.
Concrete cancer may refer to: Rebar corrosion and spalling of the concrete cover above rebar caused by the rust expansion and accelerated by chloride attack and ...
When it reacts with concrete, it causes the slab to expand, lifting, distorting and cracking as well as exerting a pressure onto the surrounding walls which can cause movements significantly weakening the structure. Some infill materials frequently encountered in building fondations and causing sulfate attack are the following: [2] Red Ash
But concrete cancer — the formal term is alkali-silica reaction — was a key issue the team raised more than a year ago in announcing the organization’s decision to pursue construction of a ...
The CDC report noted that exposure to formaldehyde contained in the flooring was higher than original calculated, increasing the cancer risk by about three times from an earlier version of the report.
Example of flat piece of concrete having dislodged with corroded rebar underneath, Welland River bridge across Queen Elizabeth Way in Niagara Falls, Ontario. The expansion of the corrosion products (iron oxides) of carbon steel reinforcement structures may induce internal mechanical stress (tensile stress) that cause the formation of cracks and disrupt the concrete structure.
Concrete creep is essentially the sagging of concrete over time. Creep and shrinkage of concrete are two physical properties of concrete.The creep of concrete, which originates from the calcium silicate hydrates (C-S-H) in the hardened Portland cement paste (which is the binder of mineral aggregates), is fundamentally different from the creep of metals and polymers.
The stream thus keeps its dendritic pattern even though it flows over a landscape that will normally produce a trellis drainage pattern. [1] A superimposed stream is a stream that forms over horizontal beds that overlie folded and faulted rock with varying resistance. Having cut down through the horizontal beds, the stream retains its course ...