EFFECT OF NEEM SEED HUSK ASH ON THE WORKABILITY OF CONCRETE
IBIWOYE, E. O., NAALLA A. on 06/01/2017
of neem products from neem tree generates large quantity of waste annually.
This paper is aimed to examine the effect of Neem Seed Husk Ash (NSHA) on
workability of concrete. Neem seed husk was obtained from Bishop Smith Memorial
College, Ilorin, sun – dried for 3 days and then calcinated at 650o C.
The calcinated neem seed husk was ground and sieved using 200 μm sieve to
obtain NSHA. Pozzolanicity test was conducted on NSHA to determine its chemical
composition. Concrete was produced with 5, 10, 15, 20 and 25% by weight of NSHA
substitution for cement. Workability tests (slump and compacting factor) were
performed for each percentage replacement. Compressive and tensile strength
tests were conducted on 150 mm cubes and 150 x 150 x 760 mm beams, respectively
at ages 3, 7, 14, 21, 28, 56, 90 and 180 days. All tests carried out were in
accordance with British Standard codes. The chemical composition of NSHA showed
that the combination of Al2O3, SiO2 and Fe2O3
was 75.35%. The slump and compacting factors of NSHA concrete ranged from 5.50
mm to 10.00 mm and 0.91 to 0.95, respectively.