Ad
related to: concrete asr mitigation
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.
Alkali–aggregate reaction is a term mainly referring to a reaction which occurs over time in concrete between the highly alkaline cement paste and non-crystalline silicon dioxide, which is found in many common aggregates. This reaction can cause the expansion of the altered aggregate, leading to spalling and loss of strength of concrete.
A fairly well-defined reaction front can often be observed in thin sections; ahead of the front the concrete is normal, or near normal. Behind the reaction front, the composition and the microstructure of concrete are modified. These changes may vary in type or severity but commonly include: Extensive cracking; Expansion
Degraded concrete and rusted, exposed reinforcement bar (rebar) on Welland River bridge of the Queen Elizabeth Way in Niagara Falls, Ontario. Concrete degradation may have many different causes. Concrete is mostly damaged by the corrosion of reinforcement bars due to the carbonatation of hardened cement paste or chloride attack under wet ...
Alkali–silica reaction (ASR), also known as alkali-aggregate reaction (AAR), when reactive amorphous silica aggregates exposed to alkaline conditions (high pH) swell inside the concrete matrix leading to the development of a network of cracks. It may also refer to:
At the end of an unnamed private road in Red River County, on a brisk fall day in 2019, Texas fire marshals approached the site of an explosion. Chunks of concrete littered the ground, while ...
Billionaires' wealth grew three times faster in 2024 than the year before, a top anti-poverty group reported on Monday as some of the world's political and financial elite prepared for an annual ...
Political analysts have wondered whether Democrats can turn this wave of progressive enthusiasm into concrete electoral gains in the 2018 midterms. One way to test that: special elections to fill empty state legislature and congressional seats.