The ASTM C666/C666M-03 standard developed by the American Society for Testing and Materials (ASTM) defines two procedures for determining the resistance of concrete samples to rapidly repeated freezing and thawing cycles in the laboratory environment:
Both procedures are designed to determine the effects of specified freeze-thaw cycles on the resistance of concrete. These procedures are not intended to provide a quantitative measure of the expected service life of a particular type of concrete.
These test methods require 300 cycles. Procedure A requires five 7.5 cm3 samples to be tested. Procedure B requires ten mounted panels per test. After the freeze-thaw cycle, the test samples are evaluated visually and any defects are reported. Brick panel assemblies are also subjected to tensile strength testing.
The freeze-thaw cycle is a major cause of damage to building materials such as concrete and brick assemblies. Freeze-thaw damage occurs when water fills the voids of a hard, porous material and then freezes and expands. The volume of frozen water is 9 percent more than liquid water. Therefore, when the water freezes, pressure is applied to the surrounding material, and cracks occur when the pressure exceeds the tensile strength of the material.
Freeze-thaw damage results from excessive water on or within the surface of materials. Two types of damage exist: surface cracking and internal cracking. Surface cracking is a consequence of repeated water or snow accumulation on both horizontal and vertical surfaces. During freezing, the outer layer of the material cracks to the depth of water penetration, exposing the underlying aggregate. Internal cracking occurs when internal cracks and voids fill with water and are exposed to freezing. Unlike surface cracking, cracking begins internally, and the damage then spreads to the surface during subsequent freeze-thaw cycles.
Among the numerous test, measurement, analysis and evaluation studies it provides for businesses in various sectors, our organization provides standard testing services for the resistance of concrete against rapid freezing and thawing, within the scope of ASTM C666/C666M-03 standard, with its trained and expert staff and advanced technological equipment. gives.
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