Behavioral study of concrete composite with mixture of fly ash and concrete sludge aggregate

Abstract

Nowadays, the high demand of cement and aggregate are an indication of development especially for the construction industry. Thus, the alternative to replace partial replacement of cement and aggregate are by using the fly ash and concrete sludge aggregate. From the research, fly ash and concrete sludge aggregate needs space of landfill to dispose off whereas the population density is high and expensive price. There were four types of different percentage samples were used. For sample 1, percentage replacement of fly ash and concrete sludge aggregate was 0% and was known as a control specimen. Then, sample 2 was used 15% of fly ash and 20% of sludge aggregate. Next, sample 3 was used 15% of fly ash and 30% of sludge aggregate. Lastly, sample 4 was used 25% of fly ash and 30% of sludge aggregate. The concrete specimens’ size that had been used is 150 mm x 150 mm x 150 mm in cube mould. The samples were tested to compare chemical, physical and engineering properties between standard concrete and replacement concrete. The highest density for replacement concrete was 2360 kg/m3. The lowest percentage of water absorption was 2.479% for 28 days. Then, the compressive strength also was done at replacement concrete which is able to receive higher load with 24.044 MPa for 28 days. On the other hand, the flexural strength test also was done in beam sample which is replacement beam sample able to receive 1.155 MPa of load The best replacement for cement and aggregate was sample 2.