The Effect of High Strength Concrete by using Silica Fume and Used Engine Oil as Additive

High strength concrete was produced using locally available materials. Nowadays, there
are many research conducted based on the processed and unprocessed industrial byproducts
and domestic wastes as raw material in cement and concrete. This is a positive
environmental impact due to the ever-increasing cost of waste disposal and sticker
environmental regulation. In order to use a given structural material to its best economic
advantage, it is important to understand its properties fully. Thus, fresh and hardened
properties of high strength concrete should be investigated properly. Investigation on the
effect of high strength concrete by using used engine oil was conducted. The previous
research showed that used engine oil have potential on increasing concrete strength and
also acting as air-entraining chemical admixture to the concrete. The main objective of
the research was to investigate the effectiveness of the combination of used engine oil
and silica fume on fresh and hardened properties due to high strength concrete. The test
done was slump test for properties of fresh concrete while for properties of hardened
concrete the tests were cube crushing strength, split cylinder and porosity test. The main
variables included the dosage of used engine oil, the water to binder ratio of the concrete
and the cement content. 10% silica fume was used as cement replacement material for
six trial mixes. Based on the results obtained, the compressive strength at 28 days for
each mixes except for mix SF550a and SF600b had reached 5OMPa which is the target
strength for this study and the highest strength achieved was 76MPa. The porosity
obtained was also low for each mixes which is good for the strength development of the
concrete. However, the tensile strength obtained from this research quiet low and it also
decreased due to time. This turned out because of cracking and dry shrinkage occurred
in the concrete mixes. From this researched, it showed that concrete containing used
engine oil and silica fume with mix proportion 1: 1.5: 2.5 can produce high strength
concrete.