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Tikrit Journal of Engineering Sciences (2017) 24(2) 11-27
Statistical Study to Check the Conformity of Aggregate in Kirkuk City to Requirement of Iraqi Specification
|Ammar S. Khazal||Nazar N. Ismael||Adbulfattah Khalaf Husein|
|Civil Eng. Dept., Tikrit University||Environmental Dept., Tikrit University|
This research reviews a statistical study to check the conformity of aggregates (Coarse and Fine) was used in Kirkuk city to the requirements of the Iraqi specifications. The data of sieve analysis (215 samples) of aggregates being obtained from of National Central Construction Laboratory and Technical College Construction Laboratory in Kirkuk city have analyzed using the statistical program SAS. The results showed that 5%, 17%, and 18% of fine aggregate samples are passing sieve sizes 10 mm, 4.75 mm, and 2.36 mm, respectively, which were less than the minimum limit allowed by the Iraqi specifications for each sieve. The percentages passing sieve sizes 1.18mm, 600micrometers, and 300micrometers were more than the upper limit of specification by 5%, 20%, and 30% respectively. The samples were passing sieve sizes 1.18mm, and 600micrometers less than the minimum limit of specification by 17%, and 4%, respectively. The results showed that the deviation in a sieve size of 150 micrometers for the upper limit of the specification performs 2% of the total number of samples. For Coarse aggregate, the samples passing sieves size 37.5mm and 20mm were comforting the Iraqi specifications by 100% and 83% respectively, it has found that the samples were passing sieve sizes 10mm was 5% was more than the higher limit of Iraqi specifications, and 27% of these samples were less than the minimum limit, whereas sample passing sieve size 5mm was 1% which is more than the upper limit of the Iraqi specification. As a result of statistical analysis of data for fine aggregate, it has found that the samples were passing sieve sizes 10mm, 2.36mm, 1.18mm and 150micrometers conforming from statistical point of view the Iraqi specifications, whereas the samples were passing sieve sizes 4.75mm, 600micrometers and 300 micrometers didn’t conform. Statistical analysis of the results of the coarse aggregates also showed that conforming to sieve sizes of 37.5mm and 20mm and didn’t conform for sieve sizes 10mm and 5mm.
Keywords: Statistical design of experiments, DOE, Linear regression analyzes.