Statistical Study to Check the Conformity of Aggregate in Kirkuk City to Requirement of Iraqi Specification

Abstract

This research reviews a statistical study to check the conformity of aggregates (Coarseand Fine) was used in Kirkuk city to the requirements of the Iraqi specifications. The data ofsieve analysis (215 samples) of aggregates being obtained from of National CentralConstruction Laboratory and Technical College Construction Laboratory in Kirkuk city haveanalyzed using the statistical program SAS. The results showed that 5%, 17%, and 18% of fineaggregate samples are passing sieve sizes 10 mm, 4.75 mm, and 2.36 mm, respectively, whichwere less than the minimum limit allowed by the Iraqi specifications for each sieve. Thepercentages passing sieve sizes 1.18mm, 600micrometers, and 300micrometers were morethan the upper limit of specification by 5%, 20%, and 30% respectively. The samples werepassing sieve sizes 1.18mm, and 600micrometers less than the minimum limit of specificationby 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 comfortingthe Iraqi specifications by 100% and 83% respectively, it has found that the samples werepassing sieve sizes 10mm was 5% was more than the higher limit of Iraqi specifications, and27% of these samples were less than the minimum limit, whereas sample passing sieve size5mm was 1% which is more than the upper limit of the Iraqi specification. As a result ofstatistical analysis of data for fine aggregate, it has found that the samples were passing sievesizes 10mm, 2.36mm, 1.18mm and 150micrometers conforming from statistical point of view theIraqi specifications, whereas the samples were passing sieve sizes 4.75mm, 600micrometersand 300 micrometers didn’t conform. Statistical analysis of the results of the coarse aggregatesalso showed that conforming to sieve sizes of 37.5mm and 20mm and didn’t conform for sievesizes 10mm and 5mm.