Effect compressive strength and split tensile strength of concrete using aggregate from Tana Toraja district with fly ash substitution

Development in Indonesia is increasing day by day. This has resulted in the construction sector from year to year experiencing a lot of progress both in terms of planning/design and in terms of updating the construction methods used. Tana Toraja regency is precise in Saluputti districts. the Maulu river is a source of a lot of coarse and fine aggregates that can be used as a material for mixing concrete. Because this area is the meeting point between the largest rivers. especially in Tana Toraja. Therefore. in this study. coarse and fine aggregates from Tana Toraja. Saluputti district are used as research objects with fly ash as an additional ingredient. The research objective was to determine the effect of fly ash substitution on compressive strength and split tensile in concrete with Tana Toraja aggregate and to determine the characteristics of the concrete produced using the aggregate from Tana Toraja with fly ash substitution. The research method is a sample testing method. in which 72 samples were tested consisting of 36 samples of compressive strength and 36 samples of split tensile strength. The test was carried out at the Concrete Structure and Material Laboratory. Department of Civil Engineering. Universitas Kristen Indonesia Paulus – Makassar South Sulawesi. The results showed that the use of fly ash as a partial substitute for cement would reduce the strength of concrete compared to concrete without the use of fly ash. The greater the level of fly ash given. the strength of the concrete will be reduced by using the aggregate from Tana Toraja district.