Abstract
Improvement of hollow brick models demands profound analysis in terms of their behavior on mechanical properties as some shape variations provide different characteristics on stress concentration. Additional waste filler i.e. sago husk and utilization of bottom ash are expected to deliver better results based on strength, weight and economic factor. This paper aims to analyze experimentally and analytically those 7 shapes variations of modified hollow bricks design with additional admixtures which consists 1,1% of sago husk and 4 composition of bottom ash i.e. 0%; 10%; 20%; and 25%. Some works were conducted in laboratory, and followed by mathematical stress analysis of hollow shape characteristics. The results show that 10 – 20% bottom ash composition share maximum value of compressive strength, with model 1 is the greatest (17.8 Mpa). Mathematical analysis provides similar results as well, where the stress concentration of model 1 was not amplified with subsequent hollow position. In conclusion, all model still appropriate to be utilized for housing, especially in element selection for lightweight bricks that meet the requirements for strength.
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