Concrete mixture using natural coarse aggregate (A case study: Ongkak River– Dumoga)

Abstract

In current construction, there are still areas that utilize natural materials such as aggregates from rivers as construction materials, one of which is in the Dumoga, Bolaang Mongondow, North Sulawesi. The communities in this area still use natural aggregates from the river in the concrete mixture in the development process. The purpose of this study was to provide information to the public about the material characteristics and quality of concrete using coarse and fine aggregates from the Ongkak River, Dumoga. Therefore, this research aims to compare the results of concrete compressive strength of several mixtures in the field (1: 1.5: 2.5) (1: 2 : 3) (1 : 2.5: 3.5) (1 : 3 : 3) and (1 : 3: 4). Based on the results of the compressive strength, the optimal compressive strength value on average at 28 days is in the specimens with mixed variations (1: 1.5: 2.5) is 24.178 MPa, followed by mix (1: 2.5: 3,5) of 17.094 MPa, mixture (1: 2 : 3) of 15.459 MPa, mix (1 : 3: 4) of 13.737 MPa, and mix (1 : 3 : 3) of 12.250 MPa respectively.

Analysis of 25 MPa quality concrete compressive strength with variations in sand zones

“…There are a lot of sand quarries, so it is necessary to carry out feasibility tests on the quality of the sand. Many studies on this matter have been carried out, including testing the feasibility of the quality of Maubesi river sand with Lumajang sand on the compressive strength of concrete and tensile strength of concrete [1], analysis of the use of Sampur beach sand as fine aggregate on the compressive strength of concrete [2], the effect of gradation sand and cement water factors in mortar on the strength of Prepacked concrete [3], comparative analysis of the compressive strength of concrete using Ulak Paceh Muba sand and Bangka sand [4], the effect of using mountain sand and river sand on the compressive strength of concrete [5], analysis of strength tests press concrete using Banjar Negara sand, Lahat Regency and Tanjung Raja Sand, Ogan Ilir Regency [6], concrete mixture using fine and coarse aggregate from the Ongkak-Dumoga river [7], Compressive Strength of Concrete using Benlelang River Fine Aggregate and Lembur River and Benlelang River Coarse Aggregate [8], Early Age Compressive Strength of Concrete Made With Mountain Sand, River Sand and Portland Composite Cement [9], Experimental Study on Pervious Cement and Pervious Geopolymer Concretes Using Sea Sand and Seawater [10]. These studies report variations in the compressive strength obtained based on the type of sand used.…”