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Exposure to fine (respirable size) particles of crystalline forms of silica is associated with adverse health effects such as silicosis, lung cancer, chronic obstructive pulmonary disease (COPD), and activation of latent Tuberculosis (TB) infections.
Crystalline Silica, which inhaled in the form of quartz or crystobalite from occupational sources, is classified by IARC as carcinogenic to humans. (Group 1) Silica, crystalline (Airborne particles of respirable size) is regulated under California's Safe Drinking Water and Toxic Enforcement Act of 1986 (Proposition 65).
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In addition to silicosis, there is now evidence that heavy and prolonged workplace exposure to dust containing crystalline silica can lead to an increased risk of lung cancer. The evidence suggests that an increased risk of lung cancer is likely to occur only in those workers who have developed silicosis.
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Dec 06, 2006· An amorphous silica (AS) replacing up to 10% of the portland cement by mass in concrete behaved partly as a traditional pozzolan, partly crystallized to quartz and the rest underwent some (crystal) structural reorganization without morphological changes.
of solution of silica is quite sensitive to even small variations in the composition of. the melt. In each solution experiment a small quartz, cristobalite, coesite, or glass sample. ( mmole) was dissolved in 40 g of melt (about 250 mmole of oxides).
Nov 04, 2016· Background. Crystalline silica is one of the commonest minerals on earth and a major ingredient in sand, granite, soil and glass. Traditionally, silica exposure occurs in workplaces such as coal and metal mining, metallurgy, construction industry and manufacturing of .
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The effects of silica fume on compressive strength silica fume creates the difficulty to utilize silica fume of mortar at the age of 3, 7 and 28 days when a part concrete .
Quartz dusts used so far in particle toxicology have been obtained by grinding rocks containing natural quartz, a process which affects crystallinity and yields dusts with variable surface states. To clarify the role of crystallinity in quartz pathogenicity we have grown intact quartz crystals in respirable size.
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Trials were conducted by increasing the amount of quartz in the mill addition from 0 wt% to wt%, under the hypothesis that the increase in silica content would have a positive effect on the acid resistance of the enamel.
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