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An Experimental study on The Durability Properties of Recycled Aggregate Concrete Exposed to Crude-oil Contamination

Barisua Ebenezer Ngekpe, Ebi James, Fubara G. Dan-Jumbo

Abstract


The deterioration of concrete infrastructures as a result of the effect of crude oil spill particularly in the Niger Delta region of Nigeria has remained a great challenge to the engineering profession and the general public at large. The objective of this project is to investigate the hardness properties of Recycled Aggregate Concrete (RAC) including water absorption, physical appearance during test bath in crude oil and automotive gas oil, compressive strength after deterioration, mass loss and strength deterioration factor. The laboratory test was conducted to investigate the possibility of using 100 percent of recycled concrete aggregate compared with granite aggregate. Durability properties due to water absorption and chemical attack test were carried out, concrete specimen prepared was subjected to three durations in various media specifically in water/ crude oil mix, water/ automotive gas oil mix and potable water. The concrete specimens were immersed in the media with environmental temperature of 25+20°C and were crushed at immersion duration of 28,60 and 90 days.  Water absorption capacity tends to increase with increased in aggregate and duration in both RAC and granite aggregate concrete in all cases of the test. The mass and deterioration factors were respectively about 6 and 16 percent higher than that of the granite aggregate concrete after 90 days of exposure to the various media considered.  Three mixes of 1:2.9:4.4, 1:3.5:5.2 and 1:3.8:5.6 (by weight) and at water - cement ratio (w/c) of 0.60, 0.70 and 0.75 were designed. These mixes gave characteristic strength of 33.36N/mm2, 26.26N/mm2 and 23.31N/mm2 respectively and are recommended for specification in structural applications.


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References


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