Physical and mechanical behaviour of pozzolan mortar blend rice husk ash filled in cold-formed steel stub column / Wan Nurain Syafiqah Wan Mohd Sukri

Nowadays, the number of underutilize of Rice husk (RH) increasing drastically as
the rice production increasing in the world. Besides that, the use of cement in
construction can cause a serious environmental condition and effect human health.
In this research, the optimum percentage of silica in Rice husk ash (RHA) was
filled into a mortar and CFS stub column. A study was conducted to determine the
physical and chemical properties of RHA and to determine the mechanical
properties of mortar and Cold-formed steel (CFS) stub column filled RHA. This
research Preliminary leaching of RH with a solution of Hydrochloric acid (HCL)
before incinerated at 550°C is to obtain relatively pure silica (>99%). The unleached
and leached RH were compared to observe the silica content in RHA. The
incinerated 10gram RH produce 34.58 percentage weight of silica. Amorphous
silica (Si) particles were characterized by using Scanning Electron Microscope
(SEM), Energy Dispersive X-Ray Spectroscopy (EDS) and X-Ray Diffraction
(XRD). The morphological features of RHA displayed in SEM. The high silica
content in RHA is determined in EDS and the amorphous peak was located at 2Ꝋ
= 23° in the XRD pattern The optimum percentage of RHA obtained will be
filled into a mortar and CFS stub column. The compressive behaviour of mortar
and CFS stub column were conducted by using a compression strength test
machine. The RHA filled into a mortar and CFS stub column can increase its
compressive strength by reducing cracking and buckling failure.