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- W1994718891 abstract "Cracking, expansion, deterioration and decline in strength and elasticity of concrete may result from cement-aggregate reactions after setting and hardening. These reactions occur as a result of using significant amount of reactive minerals and rocks, with cement of high alkali content. The most pertinent factor in locating aggregates is the geologic history of the region, which determines the characteristics of gravel and sand. The petrographic and mineralogic characteristics and geologic occurrences of coarse and fine aggregates determine the composition, gradation, and physicochemical quality of the aggregates. Local geology and source area provide positive information on the origin, type and available amount of coarse and fine aggregates in different parts of Iraq. Forty-seven samples were chosen from twenty-four quarries distributed throughout Iraq and in areas where the Bakhtiari and the Quaternary deposits crop out. All aggregate samples were subjected to petrographic examination and thirty-eight coarse and fine aggregate samples were also tested chemically. All sampled quarries were from the Bakhtiari Formation, Quaternary and river terrace deposits. The influence of the source area is evident in most of the analysis. It is generally shown from the analysis that: (1)Aggregates of central Iraq are physically good and satisfactory but chemically deleterious. (2)Aggregates of the north and northeast are poor in physical quality but innocuous in chemical quality. (3)Aggregates of the south and southwest are fair to poor in physical quality but innocuous in chemical quality." @default.
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- W1994718891 date "1975-09-01" @default.
- W1994718891 modified "2023-09-26" @default.
- W1994718891 title "A brief review of the alkali-silica in concrete and their applications to Iraqi aggregates" @default.
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- W1994718891 doi "https://doi.org/10.1016/0013-7952(75)90035-6" @default.
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