Abstract

Mussel shell is a type of waste that consist large amounts of calcium content (CaCO3) (>95%). It is potentially to be used as concrete filler which can reduce porosity in concrete micro-structure (compacted concrete) and indirectly reduce quantity of water used to maintain concrete workability. This paper investigates the performance of mussel shell waste as an admixture in normal concrete. These waste were crushed using ball mill for 5 hour then sieved with 75μm sieve sizes. Five different percentages of mussel shell ash (MSA) were incorporated in concrete as an admixture 0%, 1%, 2%, 3% and 4% (S0, S1, S2, S3 and S4) base on w/c 0.5 according to DoE method with total of 90 samples. Specimens then were cured using 2.37% of sodium chloride (NaCl) solution for 7 and 28 days. Data were analysed according to physical, mechanical and its durability properties of materials and its specimens. Particle size analysis (PSD), specific gravity, SEM image and setting time are measured on MSA, OPC and samples MSA concrete included slump analysis for concrete workability. While it’s mechanical and durability properties of MSA concrete were analyses through compressive, split tensile and water capillary absorption. The result showed that increment percentages of MSA could effect on the strength of both compressive and split tensile. However, minimum percentages of MSA of 1% gained higher strength compared to control specimen. The differences between MSA percentages and its curing duration incorporated indicating an improvement while S1 and S3 indicates lower rate of capillary absorption for 7 and 28 days each. Overall, the results to establish concrete strength improvement of MSA in concrete should be limited to 1% uses. While S2 and S4 for concrete permeability and workability. With this percentages, concrete display an improvement behaviours according to its strength and durability towards sodium chloride exposure.

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