PENGARUH KADAR LUMPUR PADA AGREGAT HALUS DALAM MUTU BETON

• Main Authors: Purwanto Purwanto, Yulita Arni Priastiwi
• Format: Article
• Language: English
• Published: Diponegoro University 2012-07-01
• Series: Teknik
• Subjects: compressive strength, clay lamps, aggregate
• Online Access: http://ejournal.undip.ac.id/index.php/teknik/article/view/4385
• ISSN: 0852-1697; 2460-9919

Clay lumps on the aggregate levels is one of the factors that may cause disruption of the binding process and<br />hardening of concrete. Clay lump can not blend with cement so that blocking a merger between the cement with<br />aggregates which eventually led to the compressive strength of concrete will be reduced in the absence of<br />binding to each other. SK SNI S-04-1989-F, the allowable levels of clay lump maximum of 5% to fine aggregate<br />(sand) and maximum of 1% for coarse aggregate (split).<br />In this study to determine the effect of the clay lump on the fine aggregate content on compressive strength of<br />concrete on five (5) variations levels of the category of clean clay lump with content of 1% and 2%, medium clay<br />lump 4% and dirty sand with levels 7 % and 11%, whereas for the coarse aggregate clay lump content was<br />0.7%.<br />From the results of a study of 90 cylindrical specimens showed that the small amount of clay lump, the higher<br />the compressive strength of concrete. Concrete compressive strength test results on average with dirty clay lump<br />content was 31.30 MPa, compressive strength for the concrete medium with clay lump levels were at 33.92 MPa<br />and compressive strength for the concrete clean of clay lump 36.68 MPa. Compared to the dirty clay lump an<br />increase in the levels of average compressive strength for moderate levels of 8,37% and the clean sand of<br />17,19%. Besides affecting in compressive strength, clay lump levels also affect the weight of concrete, and<br />concrete density. The greater the level of clay lump, weight of concrete and concrete density will be lower.<br />Compared to the dirty clay lump an increase in the levels of average concrete density for moderate levels of 6,54<br />% and the clean sand of 12,59%.