Effects of Different Sizes of Coarse Aggregates On Splitting Tensile Strength of Concrete
Publication Date : 12/05/2020
The aim of the study was to determine the effect of different sizes of coarse aggregates on the splitting tensile strength of concrete. Preliminary investigations using ACI mix design method for test such as splitting tensile strength of the different aggregates sizes were conducted. The aggregates (fine and coarse) used for the concrete were collected from gneiss rock deposits from L-Adisa, along Ojoo-Moniya Road, Ibadan. The aggregates were sun-dried and sieved to different sizes with the set of sieves: BS sieve 19mm, BS sieve 13.2mm, BS sieve 9.5mm, BS sieve 4.75mm, and were classified based on aggregates passing the aforementioned sieves in the Department of Civil Engineering. Splitting strength test were conducted after duly checking ages of curing to ascertain its relatedness to structural failures. The result was an increase in splitting tensile strength of concrete at 7days (with 5.71Mpa for concrete of coarse aggregate size of 19mm), rising to splitting tensile strength of 6.94Mpa after 28days. There was increase in splitting tensile strength of concrete made from different sizes of coarse aggregates based on progressive increase in curing age. Similarly, there was corresponding decrease in the splitting tensile strength of concrete as coarse aggregate sizes decreased. So, from these results it was deduced that, generally, the bigger the mean size of aggregates (MSA), the greater the splitting tensile strength of concrete, so long the coarse aggregates are properly graded and the maximum size of aggregates used doesn’t exceed 1/5 th of the least dimension of the concrete work.
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