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However, concrete itself may be damaged by fire, with one notable example being the 1996 Channel Tunnel fire where fire damage extended along several hundred meters of the tunnel's length. For this reason, common fire testing standards, such as ASTM E119, [ 21 ] do not permit fire testing of cementitious products unless the relative humidity ...
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
The pH level of concrete greatly influences what microbes can reproduce and how much damage is done to the concrete. A concrete surface is alkaline, making it difficult for microbes to germinate. However, chemical processes by the environment and microorganisms themselves cause changes in the concrete.
Trisodium phosphate (TSP) is an inorganic compound with the chemical formula Na 3 P O 4.It is a white, granular or crystalline solid, highly soluble in water, producing an alkaline solution.
diffuse into tissue and damage cellular structures under skin without immediately apparent damage to skin surface Exposure to a toxic substance that is insufficient to cause a chemical burn can still be very serious, and the lack of a noticeable effect from a chemical exposure is not an indication of safety, particularly in the case of chronic ...
ASTM C1293: "Test Method for Concrete Aggregates by Determination of Length Change of Concrete Due to Alkali-Silica Reaction". It is a long-term confirmation test (1 or 2 years) at 38 °C in a water-saturated moist atmosphere (inside a thermostated oven) with concrete prisms containing the aggregates to be characterised mixed with a high-alkali ...
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Bleaches generally react with many other organic substances besides the intended colored pigments, so they can weaken or damage natural materials like fibers, cloth, and leather, and intentionally applied dyes, such as the indigo of denim. For the same reason, ingestion of the products, breathing of the fumes, or contact with skin or eyes can ...
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