Study of Interlocking Brick Costing Based on The Result of Mixed Material Variation Design

Abstract

Interlocking brick is a material that is used for wall filler with the method of installation interlocked with each other. This material can also be used as a substitute for reinforced concrete structures like sloof, columns and ringbalks, thus do not need to be plastered and painted because of its attractive appearance. The use of interlocking brick can save costs and time in the performance compared to using red bricks. The mixture of the forming material consists of cement, silt and river sand sourced from Aceh Besar District, Aceh Province, Indonesia. In general, industries that produce wall fill material do not differentiate their production for wall functions as structural or non-structural and tend to overall to one quality product classification quality. This research aims to analyze the costs for the requires interlocking brick in building houses that function as structural and non structural walls. The interlocked brick function is distinguished against structural and non structural based on the compressive strength test at 28 days in the laboratory of the structure and building materials, Department of Civil Engineering, Faculty of Engineering, Syiah Kuala University. Mix design is carried out in the laboratory with a cement water factor (FAS) 0.3; 0.4; 0.5 and 18 mixed material variations with 15 specimen test for each mixture. Test objects used is 50 x 50 x 50 mm. FAS 0.4 and a mixture of material 1:2:2 and 1:2:4 are selected because meet the required workability and have a hollow concrete brick compressive strength, which are including quality levels 1 and III with an average compressive strength of 89.6 kg / m3 and 37.5 kg / m3 at the age of concrete reaching 28 days. Cost analysis is carried out by simulating the required need for interlocking brick in type 36 house buildings that can withstand structures and non-structures, then the costs of IRD 11,810,470.,- is obtained. So the use of interlocking bricks can be considered as an alternative environmentally friendly building materials with low cost.