TY  - JOUR
T1  - Reliability of Gravel in Place of Granite in Concrete Production
AU - Bamigboye, Gideon AU - Adedeji, Adeola AU - Olukanni, David AU - Jolayemi, Kayode 
JO  - Journal of Engineering and Applied Sciences
VL  - 12
IS  - 20
SP  - 5121
EP  - 5128
PY  - 2017
DA  - 2001/08/19
SN  - 1816-949x
DO  - jeasci.2017.5121.5128
UR  - https://makhillpublications.co/view-article.php?doi=jeasci.2017.5121.5128
KW  - Concrete
KW  -coarse aggregates
KW  -compressive strength
KW  -reliability
KW  -regression analysis
KW  -Nigeria
AB  - The study investigated the reliability of gravel as partial replacement of granite in concrete
production. Concrete was produced using various percentages of granite/gravel combination. Two different
mix ratios of 1:2:4 and 1:3:6 were employed. Slump tests were carried out on fresh concrete, compressive and
split tensile strength tests were performed on hardened concrete. Reliability analysis was carried out on
available data to estimate the failure probability. The reliable percentage of gravel from compressive strength
view point was 40% with a value of 21.15 N/mm<sup>2</sup> for 1:2:4 and 30% with 15.17 N/mm<sup>2</sup> for 1:3:6 mix
ratios at 28 days. Satisfying minimum requirement of BS 8110:1997. There was a significant reduction in split
tensile strength as gravel percentage increases beyond 40% for 1:3:6 mix ratio. Similar trends were observed for
1:2:4 mix ratio. Linear regression analysis was used to reliably predict characteristic strength based on any
coarse aggregate combination with positive high values of coefficients of correlation (R<sup>2</sup>) of 0.983 and 0.937,
respectively for compression and tension behavior. Comparing the result of the probability of failure obtained
with the ISO 2394:1998 (E) standard it was found that g(&#10801;)&gt;0 limit state was satisfied which indicated that the
structure is safe.
ER  -