Statistical Study to Check the Conformity of Aggregate in Kirkuk City to Requirement of Iraqi Specification
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Abstract
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 150micrometers 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.
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