Developed Prediction Models for Compressive Strength of Periwinkle Shell Concrete using Ultrasonic Pulse Velocity Test
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Abstract
Destructive test (DT) technique being the commonest means of strengths properties determination in concrete, it is characterized with numerous setbacks–time constrain and capital extensiveness of the equipment and energy demand. The study evaluated the relationship between strength and non-destructive parameters of re-vibrated periwinkle shell concrete (PSC). A nominal mix ratio 1: 2: 4 and 0.6 w.c were adopted to produce nine beams and seventy-two cubes of PSC; nine not vibrated, nine vibrated and fifty- four vibrated twice and threefold. The respective specimens were subjected to DT and non- destructive test technique. Effect of density, strength and non-destructive parameters with vibration mode and curing age were studied. The results have shown that optimum density, compressive strength, flexural strength, pulse velocity and stiffness constant are found to be 1873kg/m3, 18.86N/mm2, 5.74N/mm2, 3.96km/s (Good-quality) and 29.54kN/mm2 respectively at triple vibration mode of 60mins interval 60-60-60 at 28days age. Result obtained were analyzed using descriptive statistical tools and simple regression; where a linear relationship was noted between the strength and non-destructive parameters of the RPSC with stiffness constant showing higher correlation coefficient r=0.684 and was considered the best predictor of the strength property for the RPSC. Further studies should be carried out on the effect of segregation on RPSC, properties such as modulus of elasticity, thermal conductivity and sound insulation should be studied.
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