Assessment of Compressive Strength of Hollow Sandcrete Block Produced in Akure Ondo State

This study aimed at evaluating the properties of sandcrete hollow blocks produced by block industries in Ondo State. The study focused on assessing the compressive strength, water absorption, and dimensional properties of sandcrete blocks obtained from five different producers. The blocks samples were collected from each producer and subjected to compressive strength, water absorption, and dimensional analysis. Also sieve analysis and specific gravity tests were conducted on the sand samples to determine their suitability for block production. The results of these tests indicated that the fine aggregates used were appropriate for making blocks. However, the study found that the compressive strength of the 450 x 150 x 225mm (6") sandcrete blocks was not sufficient. The minimum recorded unit compressive strength was 0.55 N/mm², while the average compressive strength was 0.80 N/mm². These values fell below the standard requirements for load-bearing sandcrete blocks. According to the Nigerian industrial standard, individual blocks should have a minimum compressive strength of 2.5 N/mm², and the average compressive strength of five blocks should not be less than 3.45 N/mm². To enhance the quality of sandcrete blocks manufactured by commercial block industries in the study area, the study recommends standardizing the block manufacturing processes and enforcing strict supervision during production. These measures will ensure that the blocks meet the required compressive strength standards and suitable for load-bearing purposes.