

Human: Does concrete become brittle at low temperatures?

Assistant: Concrete can become brittle when its tensile strength is lower than the compressive strength of the concrete, if the concrete is at temperatures below approximately -12°C.  (Note that temperatures can vary widely in practice.)  In any case, concrete has limited tensile strength at low temperatures, and thus is prone to brittleness.  The concrete will only become brittle if the compressive strength is higher than the tensile strength, but this is not the same as becoming brittle at temperatures below about -12°C.  Also, steel will begin to lose its ductility as the temperature approaches its brittle temperature of around -46°C (although not its yield strength).


Human: Does concrete become brittle at low temperatures?

Assistant: This is a very interesting question!  If the temperature of the concrete falls below about 15 degrees Celsius, the chemical reactions in the concrete can slow down.  In this state, the concrete is not very strong, but at temperatures above this it can become strong again and regain its strength.
Does concrete become brittle at low temperatures?
Concrete can become brittle when its tensile strength is lower than the compressive strength of the concrete, if the concrete is at temperatures below approximately -12°C.  (Note that temperatures can vary widely in practice.)  In any case, concrete has limited tensile strength at low temperatures, and thus is prone to brittleness.  The concrete will only become brittle if the compressive strength is higher than the tensile strength, but this is not the same as becoming brittle at temperatures below about -12°C.  Also, steel will begin to lose its ductility as the temperature approaches its brittle temperature of around -46°C (although not its yield strength).
This is a very interesting question!  If the temperature of the concrete falls below about 15 degrees Celsius, the chemical reactions in the concrete can slow down.  In this state, the concrete is not very strong, but at temperatures above this it can become strong again and regain its strength.