Abstract
Normal concrete uses fine aggregate and coarse aggregate with concrete density 2200 kg/m3-2400 kg/m3 with a compressive strength of about 15-40 MPa [1]. The purpose of this study is to determine characteristics of the concrete aggregate and the compressive strength of the concrete design based on the DOE (Department of Environment) method and the SNI Standard. In this research, the use of nugmet shell was varied as follows: 0%, 0,25%, 0,50%, 0,75% and 1% of the cement weight. The results showed that the use of nutmeg shells as a normal concrete affected the specific gravity and the value compressive strength of concrete. The higher the percentage of nutmeg shells, the lower the specific gravity and compressive strength of the concrete. The average value of density to nutmeg shell concrete (NSC) 2254.72 (kg/m3) and normal concrete 2304.32 (kg/m3). The compressive strength of normal concrete is 224.2 kg/cm2 and the nutmeg shell concrete (NSC) the composition of 0.25% and 0.5% obtained by 129.6 kg/cm2 and 140.0 kg/cm2 increases the use of nutmeg shell 0.75% and 1% obtained value of 117.6 kg/cm2 and 118.1 kg/cm2 decreased at the age of 28 days. The compressive strength of normal concrete 22 MPa while the maximum nutmeg shell concrete (NSC) 14 MPa, so it does not meet the quality of normal concrete in general.
Highlights
The use of concrete as a building material has been very popular in Indonesia because it can utilize local materials such as gravel, sand, cement and water which are obtained at relatively low prices [1]
One example of efforts to overcome these limitations is the use of nutmeg shells for coarse aggregate material in the manufacture of concrete, both lightweight concrete and normal concrete
The results showed that the nutmeg shell reduced the weight of the concrete volume, the higher the percentage used in the concrete mixture, the lighter the weight of the concrete
Summary
The use of concrete as a building material has been very popular in Indonesia because it can utilize local materials such as gravel, sand, cement and water which are obtained at relatively low prices [1]. Sometimes in certain areas it is very limited to get aggregate, especially gravel and river sand. Fakfak Regency is one of the regencies in West Papua Province with limited aggregate availability. Bomberay district with a distance of 200 km, one of the sub-districts that supplies the aggregate demand for construction in Fakfak [2], most of it must be imported from outside provinces such as Sulawesi. The limited natural resources in providing aggregates for the manufacture of concrete is a very important problem so that an alternative is needed to replace part or all of the aggregate. One example of efforts to overcome these limitations is the use of nutmeg shells for coarse aggregate material in the manufacture of concrete, both lightweight concrete and normal concrete
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