MODELLING THE COMPRESSIVE STRENGTH OF LIGHTWEIGHT CEMENT-PALM KERNEL SHELL BASED SANDCRETE BLOCKS BY DENSITY USING MULTIPLE REGRESSION
Abstract
The work investigated the effects of Pulverized Palm Kernel Shell and Fine Aggregate proportions on the Compressive Strength of Lightweight Sandcrete Blocks. The compressive strength of Lightweight Sandcrete Block produced with pulverized palm kernel shell and river sand were investigated using densities of the constituent materials. Multiple Regression Method was used in the analysis of the Model. The hollow samples of blocks were produced with mix ratio of 1:6 cement-aggregate and 0.45 water-cement ratio. The blocks measuring 450mm x 225mm x 225mm in dimensions conforming to EN 771-3:2011+A1. The fine aggregate was partially replaced with 0, 1, 5, 10, 15, and 20% of Pulverized Palm Kernel Shell. The specimens after curing for 7, 14, 21, 28 and 56 days gave the compressive strengths of 2.513 N/mm2, 2.527 N/mm2, 2.608 N/mm2, 2.871 N/mm2, 2.639 N/mm2, and 2.510 N/mm2 respectively at 28th day test for 0, 1, 5, 10, 15, and 20% which are higher than 2.500 N/mm2 compressive strength of sandcrete block recommended by the Nigeria Industry Standard (NIS:87- 2000) at 28th day of test. The mix with maximum compressive strength at 28th day test is 10% mix which is 2.871 N/mm2. This showed a general increase of 14.84% higher than 2.500 N/mm2 recommended by the Nigeria Industry Standard. The work generated models to predict the compressive strength and design mix for the production of lightweight sandcrete blocks with Pulverized Palm Kernel Shell as partial substitute for Fine Aggregate.
KEYWORDS: Â Compressive, Density, Materials, Proportion, Pulverize and Regression
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