PROBABILISTIC MODELLING OF CONCRETE STRENGTH AND ELASTICITY

Abstract

As the nature of loads and material resistances is probabilistic, there is an established need for extensive collection of data on material strength and loads, its statistical analysis and probabilistic modelling so that optimum values of various safety margins and load factors may be arrived at. The present study is aimed to systematically generate data on time dependent properties of concrete namely strength and elasticity, to subject the data so generated to statistical analysis and time-variant and time-invariant probability modelling. The experimental data has been generated for two mixes. MIX I and MIX II having characteristic strength 16 and "-; N imm respectively. The strength and elasticity were studied upto the age of 60 days. To study the batch effect variance, the number of batches taken were three for both the properties. The present investigation shows that the variance in compressive strength and modulus of elasticity due to batching under laboratory conditions is -insignificant at 5 percent probability level for both the mixes. Further with increase in age the population mean of both the above properties increases while C.O.V decreases. iii